Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
TOMOTSUGU WAKASA Last modified date:2021.06.15

Professor / Fundamental Particle Physics / Department of Physics / Faculty of Sciences


Papers
1. Stuhl, L., Sasano, M., Gao, J., Hirai, Y., Yako, K., Wakasa, T., Ahn, D.S., Baba, H., Chilug, A.I., Franchoo, S., Fujino, Y., Fukuda, N., Gibelin, J., Hahn, I.S., Halász, Z., Harada, T., Harakeh, M.N., Inomoto, D., Isobe, T., Kasahara, H., Kim, D., Kiss, G.G., Kobayashi, T., Kondo, Y., Korkulu, Z., Koyama, S., Kubota, Y., Kurihara, A., Liu, H.N., Matsumoto, M., Michimasa, S., Miki, H., Miwa, M., Motobayashi, T., Nakamura, T., Nishimura, M., Otsu, H., Panin, V., Park, S., Saito, A.T., Sakai, H., Sato, H., Shimada, T., Shimizu, Y., Shimoura, S., Spiridon, A., Stefanescu, I.C., Sun, X., Sun, Y.L., Suzuki, H., Takada, E., Togano, Y., Tomai, T., Trache, L., Tudor, D., Uesaka, T., Yamada, H., Yang, Z., Yasuda, M., Yoneda, K., Yoshida, K., Zenihiro, J. & Zhang, N, Study of spin-isospin response of 11Li neutron-drip-line nucleus with PANDORA, Journal of Physics: Conference Series, 1643, 012107-012107, 2020.12, The spin-isospin responses of the 11Li drip-line nucleus has been measured. Preliminary results of the 11Li(p, n)11Be experiment in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center are presented including the observation of 1n, 2n, t, d, 2α and 6He+α decay channels of 11Be reaction product. Details of the experimental setup based on PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition) low-energy neutron detector and the SAMURAI large-acceptance magnetic spectrometer are described..
2. A.Watanabe, S.Nakai, Y.Wada, K.Sekiguchi, A.Deltuva, T.Akieda, D.Etoh, M.Inoue, Y.Inoue, K.Kawahara, H.Kon, K.Miki, T.Mukai, D.Sakai, S.Shibuya, Y.Shiokawa, T.Taguchi, H.Umetsu, Y.Utsuki, M.Watanabe, S.Goto, K.Hatanaka, Y.Hirai, T.Ino, D.Inomoto, A.Inoue, S.Ishikawa, M.Itoh, H.Kanda, H.Kasahara, N.Kobayashi, Y.Maeda, S.Mitsumoto, S.Nakamura, K.Nonaka, H.J.Ong, H.Oshiro, Y.Otake, H.Sakai, A.Taketani, A.Tamii, D.T.Tran, T.Wakasa, Y.Wakabayashi, T.Wakui, Proton-3He elastic scattering at intermediate energies, Physical Review C, 10.1016/j.nimb.2019.05.057, 103, 044001-044001, 2021.04.
3. Stuhl, L., Sasano, M., Gao, J., Hirai, Y., Yako, K., Wakasa, T., Ahn, D.S., Baba, H., Chilug, A.I., Franchoo, S., Fujino, Y., Fukuda, N., Gibelin, J., Hahn, I.S., Halász, Z., Harada, T., Harakeh, M.N., Inomoto, D., Isobe, T., Kasahara, H., Kim, D., Kiss, G.G., Kobayashi, T., Kondo, Y., Korkulu, Z., Koyama, S., Kubota, Y., Kurihara, A., Liu, H.N., Matsumoto, M., Michimasa, S., Miki, H., Miwa, M., Motobayashi, T., Nakamura, T., Nishimura, M., Otsu, H., Panin, V., Park, S., Saito, A.T., Sakai, H., Sato, H., Shimada, T., Shimizu, Y., Shimoura, S., Spiridon, A., Stefanescu, I.C., Sun, X., Sun, Y.L., Suzuki, H., Takada, E., Togano, Y., Tomai, T., Trache, L., Tudor, D., Uesaka, T., Yamada, H., Yang, Z., Yasuda, M., Yoneda, K., Yoshida, K., Zenihiro, J. & Zhang, N, Study of spin-isospin responses of radioactive nuclei with the background-reduced neutron spectrometer, PANDORA, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 10.1016/j.nimb.2019.05.057, 463, 189-194, 2020.01, The status of a project to measure spin-isospin responses of neutron drip-line nuclei using a new low-energy neutron detector, PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition), is reported. The performance of PANDORA was characterized by the 6He(p,n)6Li reaction in inverse kinematics at the HIMAC facility in Chiba. Observation of the strong transition to the ground state in 6Li is discussed. Preliminary results of 11Li(p,n)11Be and 14Be(p,n)14B experiments in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center are also presented including the exotic decay channel of 11Be→9Li + d. Details of the experimental setup based on PANDORA and the SAMURAI large-acceptance magnetic spectrometer, as well as the combined data-acquisition system are described. The neutron-gamma discrimination capability of PANDORA was evaluated, Figure-of-Merit (FoM) values higher than those found in the literature for similar materials were derived from experimental data..
4. T. L. Tang, T. Wakasa et al., How Different is the Core of F 25 from O g. s. 24 ?, Physical Review Letters, 10.1103/PhysRevLett.124.212502, 124, 21, 212502, 2020.05, The structure of a neutron-rich F25 nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A MeV in inverse kinematics. The sum of spectroscopic factors of π0d5/2 orbital is found to be 1.0±0.3. However, the spectroscopic factor with residual O24 nucleus being in the ground state is found to be only 0.36±0.13, while those in the excited state is 0.65±0.25. The result shows that the O24 core of F25 nucleus significantly differs from a free O24 nucleus, and the core consists of ∼35% O24g.s.. and ∼65% excited O24. The result may infer that the addition of the 0d5/2 proton considerably changes neutron structure in F25 from that in O24, which could be a possible mechanism responsible for the oxygen dripline anomaly. .
5. S. Nakai, K. Sekiguchi, K. Miki, A. Watanabe, T. Mukai, S. Shibuya, M. Watanabe, K. Kawahara, D. Sakai, Y. Wada, Y. Shiokawa, T. Taguchi, D. Eto, T. Akieda, H. Kon, M. Ito, T. Ino, K. Hatanaka, A. Tamii, H. J. Ong, N. Kobayashi, A. Inoue, S. Nakamura, T. Wakasa, S. Mitsumoto, H. Ohshiro, S. Goto, Y. Maeda, H. Sakai, T. Uesaka, T. Wakui, Measurement for p–(formula presented)He Elastic Scattering with a 65 MeV Polarized Proton Beam, 22nd International Conference on Few-Body Problems in Physics, FB22 2018 Recent Progress in Few-Body Physics - Proceedings of the 22nd International Conference on Few-Body Problems in Physics, FB22 2018, 10.1007/978-3-030-32357-8_85, 513-516, 2020.01, We performed the measurement of the cross section and the proton analyzing power (formula presented) for p–(formula presented)He elastic scattering with a 65 MeV polarized proton beam at Research Center for Nuclear Physics (RCNP), Osaka University. The proton analyzing power (formula presented) data are compared with the theoretical calculations based on the nucleon–nucleon potential (INOY04)..
6. K. Sekiguchi, Y. Wada, A. Watanabe, D. Eto, T. Akieda, H. Kon, K. Miki, N. Sakamoto, H. Sakai, M. Sasano, Y. Shimizu, H. Suzuki, T. Uesaka, Y. Yanagisawa, M. Dozono, S. Kawase, Y. Kubota, K. Yako, Y. Maeda, S. Kawakami, T. Yamamoto, S. Sakaguchi, T. Wakasa, J. Yasuda, A. Ohkura, Y. Shindo, M. Tabata, E. Milman, S. Chebotaryov, H. Okamura, T. L. Tang, Compelete Set of Deuteron Analyzing Powers for dp Elastic Scattering at 70–300 MeV/nucleon and Three-Nucleon Forces, 22nd International Conference on Few-Body Problems in Physics, FB22 2018 Recent Progress in Few-Body Physics - Proceedings of the 22nd International Conference on Few-Body Problems in Physics, FB22 2018, 10.1007/978-3-030-32357-8_84, 507-511, 2020.01, In order to study three-nucleon force (3NF) effects in three-nucleon scattering we performed the measurements of the cross sections and the spin observables for the deuteron–proton (dp) scattering with the polarized deuteron beams at the incident energies up to 135 MeV/nucleon. Recently we have extended the measurements at the RIKEN RI Beam Factory (RIBF) with the polarized deuteron beams at 190, 250, and 300 MeV/nucleon..
7. L. Stuhl, M. Sasano, J. Gao, Y. Hirai, K. Yako, T. Wakasa, D. S. Ahn, H. Baba, A. I. Chilug, S. Franchoo, Y. Fujino, N. Fukuda, J. Gibelin, I. S. Hahn, Z. Halász, T. Harada, M. N. Harakeh, D. Inomoto, T. Isobe, H. Kasahara, D. Kim, G. G. Kiss, T. Kobayashi, Y. Kondo, Z. Korkulu, S. Koyama, Y. Kubota, A. Kurihara, H. N. Liu, M. Matsumoto, S. Michimasa, H. Miki, M. Miwa, T. Motobayashi, T. Nakamura, M. Nishimura, H. Otsu, V. Panin, S. Park, A. T. Saito, H. Sakai, H. Sato, T. Shimada, Y. Shimizu, S. Shimoura, A. Spiridon, I. C. Stefanescu, X. Sun, Y. L. Sun, H. Suzuki, E. Takada, Y. Togano, T. Tomai, L. Trache, D. Tudor, T. Uesaka, H. Yamada, Z. Yang, M. Yasuda, K. Yoneda, K. Yoshida, J. Zenihiro, N. Zhang, Study of spin-isospin responses of radioactive nuclei with the background-reduced neutron spectrometer, PANDORA, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 10.1016/j.nimb.2019.05.057, 463, 189-194, 2020.01, The status of a project to measure spin-isospin responses of neutron drip-line nuclei using a new low-energy neutron detector, PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition), is reported. The performance of PANDORA was characterized by the <sup>6</sup>He(p,n)<sup>6</sup>Li reaction in inverse kinematics at the HIMAC facility in Chiba. Observation of the strong transition to the ground state in <sup>6</sup>Li is discussed. Preliminary results of <sup>11</sup>Li(p,n)<sup>11</sup>Be and <sup>14</sup>Be(p,n)<sup>14</sup>B experiments in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center are also presented including the exotic decay channel of <sup>11</sup>Be→9Li + d. Details of the experimental setup based on PANDORA and the SAMURAI large-acceptance magnetic spectrometer, as well as the combined data-acquisition system are described. The neutron-gamma discrimination capability of PANDORA was evaluated, Figure-of-Merit (FoM) values higher than those found in the literature for similar materials were derived from experimental data..
8. Y. Kubota, M. Sasano, T. Uesaka, M. Dozono, M. Itoh, S. Kawase, M. Kobayashi, C. S. Lee, H. Matsubara, K. Miki, H. Miya, Y. Ono, S. Ota, K. Sekiguchi, T. Shima, T. Taguchi, T. L. Tang, H. Tokieda, Tomotsugu Wakasa, T. Wakui, J. Yasuda, J. Zenihiro, Development of a neutron detector with a high position resolution at intermediate energies, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2018.10.153, 914, 32-41, 2019.01, A high position resolution neutron detector for time-of-flight measurements is being developed to measure the [Formula presented] reaction in inverse kinematics with an excitation energy resolution of 1 MeV at the RIKEN RI Beam Factory. In this study, a new method based on the segmentation of the neutron detector part is employed to achieve a position resolution on the order of mm with a prototype neutron detector. The prototype detector consists of 8 × 8 scintillating fibers, two multi-anode photomultiplier tubes (PMTs) and two light guides. The scintillating fibers have a cross sectional area of [Formula presented]. The prototype's performance is studied using the neutron and proton beams provided at the Cyclotron and Radioisotope Center (CYRIC), Tohoku University and the Research Center for Nuclear Physics (RCNP), Osaka University. It is confirmed that the hit pattern analysis correctly recognizes the neutron detection position within the fiber size of 3.75 mm. The obtained TOF resolution of 350 ps (FWHM), lateral position resolution of 2.5 mm (FWHM), and longitudinal position resolution of 50–60 mm (FWHM) satisfy the requirements to achieve an excitation energy resolution of 1 MeV. The typical detection efficiency is [Formula presented]2.0% for a neutron with a kinetic energy of 50–200 MeV. The detailed investigation of the detection efficiency in conjunction with the neutron hit position reveals the existence of the non-uniformity of the efficiency. It is shown that the non-uniformity can be mitigated by reducing the threshold level, and by increasing the detector size. For a larger neutron detector, based on the design of the prototype detector, the non-uniformity will thus be negligible..
9. J. Yasuda, M. Sasano, R. G.T. Zegers, H. Baba, D. Bazin, W. Chao, M. Dozono, N. Fukuda, N. Inabe, T. Isobe, G. Jhang, D. Kameda, M. Kaneko, K. Kisamori, M. Kobayashi, N. Kobayashi, T. Kobayashi, S. Koyama, Y. Kondo, A. J. Krasznahorkay, T. Kubo, Y. Kubota, M. Kurata-Nishimura, C. S. Lee, J. W. Lee, Y. Matsuda, E. Milman, S. Michimasa, T. Motobayashi, D. Muecher, T. Murakami, T. Nakamura, N. Nakatsuka, S. Ota, H. Otsu, V. Panin, W. Powell, S. Reichert, Satoshi Sakaguchi, H. Sakai, M. Sako, H. Sato, Y. Shimizu, M. Shikata, S. Shimoura, L. Stuhl, T. Sumikama, H. Suzuki, S. Tangwancharoen, M. Takaki, H. Takeda, T. Tako, Y. Togano, H. Tokieda, J. Tsubota, T. Uesaka, Tomotsugu Wakasa, K. Yako, K. Yoneda, J. Zenihiro, Extraction of the Landau-Migdal Parameter from the Gamow-Teller Giant Resonance in Sn 132, Physical Review Letters, 10.1103/PhysRevLett.121.132501, 121, 13, 2018.09, The key parameter to discuss the possibility of the pion condensation in nuclear matter, i.e., the so-called Landau-Migdal parameter g′, was extracted by measuring the double-differential cross sections for the (p,n) reaction at 216 MeV/u on a neutron-rich doubly magic unstable nucleus, Sn132 with the quality comparable to data taken with stable nuclei. The extracted strengths for Gamow-Teller (GT) transitions from Sn132 leading to Sb132 exhibit the GT giant resonance (GTR) at the excitation energy of 16.3±0.4(stat)±0.4(syst) MeV with the width of Γ=4.7±0.8 MeV. The integrated GT strength up to Ex=25 MeV is SGT-=53±5(stat)-10+11(syst), corresponding to 56% of Ikeda's sum rule of 3(N-Z)=96. The present result accurately constrains the Landau-Migdal parameter as g′=0.68±0.07, thanks to the high sensitivity of the GTR energy to g′. In combination with previous studies on the GTR for Zr90 and Pb208, the result of this work shows the constancy of this parameter in the nuclear chart region with (N-Z)/A=0.11 to 0.24 and A=90 to 208..
10. S. Chebotaryov, Satoshi Sakaguchi, T. Uesaka, T. Akieda, Y. Ando, M. Assie, D. Beaumel, N. Chiga, M. Dozono, A. Galindo-Uribarri, B. Heffron, A. Hirayama, T. Isobe, K. Kaki, S. Kawase, W. Kim, T. Kobayashi, H. Kon, Y. Kondo, Y. Kubota, S. Leblond, H. Lee, T. Lokotko, Y. Maeda, Y. Matsuda, K. Miki, E. Milman, T. Motobayashi, T. Mukai, S. Nakai, T. Nakamura, A. Ni, T. Noro, S. Ota, H. Otsu, T. Ozaki, V. Panin, S. Park, A. Saito, H. Sakai, M. Sasano, H. Sato, K. Sekiguchi, Y. Shimizu, I. Stefan, L. Stuhl, M. Takaki, K. Taniue, K. Tateishi, S. Terashima, Y. Togano, T. Tomai, Y. Wada, Tomotsugu Wakasa, T. Wakui, A. Watanabe, H. Yamada, Zh Yang, M. Yasuda, J. Yasuda, K. Yoneda, J. Zenihiro, Proton elastic scattering at 200 A MeV and high momentum transfers of 1.7-2.7 fm -1 as a probe of the nuclear matter density of 6 He, Progress of Theoretical and Experimental Physics, 10.1093/ptep/pty048, 2018, 5, 2018.05, Differential cross sections of p-6He elastic scattering were measured in inverse kinematics at an incident energy of 200 A MeV, covering the high momentum transfer region of 1.7-2.7 -1. The sensitivity of the elastic scattering at low and high momentum transfers to the density distribution was investigated quantitatively using relativistic impulse approximation calculations. In the high momentum transfer region, where the present data were taken, the differential cross section has an order of magnitude higher sensitivity to the inner part of the 6He density relative to the peripheral part (15:1). This feature makes the obtained data valuable for the deduction of the inner part of the 6He density. The data were compared to a set of calculations assuming different proton and neutron density profiles of 6He. The data are well reproduced by the calculation assuming almost the same profiles of proton and neutron densities around the center of 6He, and a proton profile reproducing the known point-proton radius of 1.94 fm. This finding is consistent with the assumption that the 6He nucleus consists of a rigid α-like core with a two-neutron halo..
11. A. M. Long, T. Adachi, M. Beard, G. P.A. Berg, M. Couder, R. J. Deboer, M. Dozono, J. Görres, H. Fujita, Y. Fujita, K. Hatanaka, D. Ishikawa, T. Kubo, H. Matsubara, Y. Namiki, S. O'Brien, Y. Ohkuma, H. Okamura, H. J. Ong, D. Patel, Y. Sakemi, Y. Shimbara, S. Suzuki, R. Talwar, A. Tamii, A. Volya, Tomotsugu Wakasa, R. Watanabe, M. Wiescher, R. Yamada, J. Zenihiro, α -unbound levels in Ar 34 from Ar 36 (p,t) Ar 34 reaction measurements and implications for the astrophysical S 30 (α,p) Cl 33 reaction rate, Physical Review C, 10.1103/PhysRevC.97.054613, 97, 5, 2018.05, The S30(α,p)Cl33 reaction has been identified in several type-1 x-ray burst (XRB) sensitivity studies as a significant reaction within the αp process, possibly influencing not only the abundances of burst ashes but also the bolometric shape of double-peaked light curves coming from certain XRB systems. Given the dearth of experimental data on the S30(α,p) Cl33 reaction at burst temperatures, we have performed high energy-resolution forward-angle Ar36(p,t)Ar34 measurements in order to identify levels in Ar34 that could appear as resonances in the S30(α,p)Cl33 reaction. Energies of levels identified in this work, along with model-based assumptions for spin assignments and spectroscopic factors, were then used to determine a rate for the S30(α,p)Cl33 reaction based on a narrow-resonance formalism. The rates determined in this work are then compared with two standard Hauser-Feshbach model predictions over a range of XRB temperatures..
12. Shoichiro Kawase, Tomohiro Uesaka, Tsz Leung Tang, Didier Beaumel, Masanori Dozono, Taku Fukunaga, Toshihiko Fujii, Naoki Fukuda, Alfredo Galindo-Uribarri, Sanghoon Hwang, Naoto Inabe, Takahiro Kawabata, Tomomi Kawahara, Wooyoung Kim, Keiichi Kisamori, Motoki Kobayashi, Toshiyuki Kubo, Yuki Kubota, Kensuke Kusaka, Cheongsoo Lee, Yukie Maeda, Hiroaki Matsubara, Shin Michimasa, Hiroyuki Miya, Tetsuo Noro, Yuki Nozawa, Alexandre Obertelli, Kazuyuki Ogata, Shinsuke Ota, Elizabeth Padilla-Rodal, Satoshi Sakaguchi, Hideyuki Sakai, Masaki Sasano, Susumu Shimoura, Samvel Stepanyan, Hiroshi Suzuki, Tomokazu Suzuki, Motonobu Takaki, Hiroyuki Takeda, Atsushi Tamii, Hiroshi Tokieda, Tomotsugu Wakasa, Takashi Wakui, Kentaro Yako, Jumpei Yasuda, Yoshiyuki Yanagisawa, Rin Yokoyama, Kazuki Yoshida, Koichi Yoshida, Juzo Zenihiro, Exclusive quasi-free proton knockout from oxygen isotopes at intermediate energies, Progress of Theoretical and Experimental Physics, 10.1093/ptep/pty011, 2018, 2, 2018.02, The dependence of the single-particle strength on the difference between proton and neutron separation energies is studied for oxygen isotopes in a wide range of isospins. The cross sections of the quasi-free (p, 2p) reaction on 14,16,18,22,24O were measured at intermediate energies. The measured cross sections are compared to predictions based on the distorted wave impulse approximation and shell-model psd valence-space spectroscopic factors. The reduction factors, which are the ratio of the experimental cross sections to the theoretical predictions, show no apparent dependence on the proton–neutron separation energy difference. The result is compatible with the result of the (e, ep) reaction on stable targets and with the predictions of recent ab initio calculations..
13. T. Wakasa, Nuclear spin physics via polarization measurements, 23rd International Spin Physics Symposium, SPIN 2018 Proceedings of Science, 346, 2018.01, One of the primary goals of nuclear physics is to describe nuclei and their dynamics in terms of interactions between nuclear constituents. In addition, high-precision experimental data and sophisticated calculations are very important for other research fields such as astrophysics and neutrino physics. Three topics are discussed by comparing experimental data with recent theoretical calculations; three-nucleon force effects in few nucleon systems, polarization phenomena and spin-isospin responses in quest of a comprehensive description of nuclei, and applications to neutrino physics..
14. K. Sekiguchi, H. Witala, T. Akieda, D. Eto, H. Kon, Y. Wada, A. Watanabe, S. Chebotaryov, M. Dozono, J. Golak, H. Kamada, S. Kawakami, Y. Kubota, Y. Maeda, K. Miki, E. Milman, A. Ohkura, H. Sakai, S. Sakaguchi, N. Sakamoto, M. Sasano, Y. Shindo, R. Skibinski, H. Suzuki, M. Tabata, T. Uesaka, T. Wakasa, K. Yako, T. Yamamoto, T. Yanagisawa, J. Yasuda, Complete set of deuteron analyzing powers from (d)over-right-arrowp elastic scattering at 190 MeV/nucleon, Physical Review C, 10.1103/PhysRevC.96.064001, 96, 6, 96, 064001, 2017.12.
15. T. Wakasa, K. Ogata, T. Noro, Proton-induced knockout reactions with polarized and unpolarized beams, Progress in Particle and Nuclear Physics, 10.1016/j.ppnp.2017.06.002, 96, 32-87, 2017.09, Proton-induced knockout reactions provide a direct means of studying the single particle or cluster structures of target nuclei. In addition, these knockout reactions are expected to play a unique role in investigations of the effects of the nuclear medium on nucleon–nucleon interactions as well as the properties of nucleons and mesons. However, due to the nature of hadron probes, these reactions can suffer significant disturbances from the nuclear surroundings and the quantitative theoretical treatment of such processes can also be challenging. In this article, we review the experimental and theoretical progress in this field, particularly focusing on the use of these reactions as a spectroscopic tool and as a way to examine the medium modification of nucleon–nucleon interactions. With regard to the former aspect, the review presents a semi-quantitative evaluation of these reactions based on existing experimental data. In terms of the latter point, we introduce a significant body of evidence that suggests, although does not conclusively prove, the existence of medium effects. In addition, this paper also provides information and comments on other related subjects..
16. Tomotsugu Wakasa, S. Goto, M. Matsuno, S. Mitsumoto, T. Okada, H. Oshiro, Satoshi Sakaguchi, Neutron production cross sections for (d, n) reactions at 55 MeV, Progress of Theoretical and Experimental Physics, 10.1093/ptep/ptx099, 2017, 8, 2017.08, The cross sections for (d, n) reactions on
nat
C-
197
Au have been measured at a bombarding energy of 55 MeV and a laboratory scattering angle of θ
lab
= 9.5

. The angular distributions for the
nat
C(d, n) reaction have also been obtained at θ
lab
= 0

-40

. The neutron energy spectra are dominated by deuteron breakup contributions and their peak positions can be reasonably reproduced by considering the Coulomb force effects. The data are compared with the TENDL-2015 nuclear data and Particle and Heavy Ion Transport code System (PHITS) calculations. Both calculations fail to reproduce the measured energy spectra and angular distributions..
17. T. Wakasa, S. Goto, M. Matsuno, S. Mitsumoto, T. Okada, H. Oshiro, and S. Sakaguchi, Neutron production cross sections for (d, n) reactions at 55 MeV, Progress of Theoretical and Experimental Physics, 2017, 083D01-1-083D01-11, 2017, 083D01, 2017.07, The cross sections for (d,n) reactions on natC–197Au have been measured at a bombarding energy of 55MeV and a laboratory scattering angle of θlab = 9.5◦. The angular distributions for the natC(d, n) reaction have also been obtained at θlab = 0◦–40◦. The neutron energy spectra are dominated by deuteron breakup contributions and their peak positions can be reasonably reproduced by considering the Coulomb force effects. The data are compared with the TENDL- 2015 nuclear data and Particle and Heavy Ion Transport code System (PHITS) calculations. Both calculations fail to reproduce the measured energy spectra and angular distributions..
18. T. Wakasa, J. Yasuda, M. Dozono, T. Fukunaga, S. Gotanda, K. Hatanaka, K. Ishibashi, Y. Kanaya, S. Kimura, Y. Maeda, Y. Maeda, Y. Nishio, T. Noro, T. Nozoe, K. Ohnaka, S. Sakaguchi, Y. Sakemi, K. Sekiguchi, T. Taguchi, Y. Wada, Cross sections and analyzing powers for (p - ,np) reactions of H 2, Li 6, and C 12 at 296 MeV CROSS SECTIONS and ANALYZING POWERS for (... T. WAKASA et al., Physical Review C, 10.1103/PhysRevC.96.014604, 96, 1, 2017.07, We report measurements of cross sections and analyzing powers for nucleon-knockout (pnp) reactions of H2, Li6, and C12 at 296 MeV using the RCNP NPOL3 neutron detector and large acceptance spectrometer. The 1s and 1p knockout reactions were successfully separated with a separation-energy resolution of approximately 6 MeV. The resulting data were compared with plane-wave and distorted-wave impulse approximation calculations employing the nucleon-nucleon t matrix in free space. No significant differences were identified in the case of the present analyzing power data, in contrast to the significant reductions observed in (p2p) values. The conventional Pauli blocking and nuclear binding effects with the g matrix and the relativistic effect of nucleon mass reduction in the nuclei are also discussed..
19. T. Wakasa, K. Ogata, T. Noro, Proton-induced knockout reactions with polarized and unpolarized beams, Progress of Particle and Nuclear Physics, 96, 32-87, 96, 32, 2017.06.
20. K. Sekiguchi, Y. Wada, A. Watanabe, D. Eto, T. Akieda, H. Kon, K. Miki, N. Sakamoto, H. Sakai, M. Sasano, Y. Shimizu, H. Suzuki, T. Uesaka, Y. Yanagisawa, M. Dozono, S. Kawase, Y. Kubota, C. S. Lee, K. Yako, Y. Maeda, S. Kawakami, T. Yamamoto, S. Sakaguchi, T. Wakasa, J. Yasuda, A. Ohkura, Y. Shindo, M. Tabata, E. Milman, S. Chebotaryov, H. Okamura, T. L. Tang, Deuteron Analyzing Powers for dp Elastic Scattering at Intermediate Energies and Three-Nucleon Forces, Few-Body Systems, 10.1007/s00601-017-1213-6, 58, 2, 2017.03, We have measured a complete set of deuteron analyzing powers in deuteron–proton elastic scattering at 190, 250, and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon–nucleon forces together with the Tucson-Melbourne’99, and UrbanaIX three nucleon forces. The data are also presented with the calculations based on the N4LO NN potentials of the chiral effective field theory..
21. T. Wakasa, J. Yasuda, M. Dozono, T. Fukunaga, S. Gotanda, K. Hatanaka, K. Ishibashi, Y. Kanaya, S. Kimura, Y. Maeda, Y. Maeda, Y. Nishio, T. Noro, T. Nozoe, K. Ohnaka, S. Sakaguchi, Y. Sakemi, K. Sekiguchi, T. Taguchi, and Y. Wada, Cross sections and analyzing powers for (p⃗,np) reactions of 2H, 6Li, and 12C at 296 MeV, Physical Review C, 96, 014604-1-014604-10, 96, 014604, 2017.01, We report measurements of cross sections and analyzing powers for nucleon-knockout (p⃗,np) reactions of 2H, 6Li, and 12C at 296 MeV using the RCNP NPOL3 neutron detector and large acceptance spectrometer. The 1s and 1p knockout reactions were successfully separated with a separation-energy resolution of approximately 6 MeV. The resulting data were compared with plane-wave and distorted-wave impulse approximation calculations employing the nucleon-nucleon t matrix in free space. No significant differences were identified in the case of the present analyzing power data, in contrast to the significant reductions observed in (p⃗,2p) values. The conventional Pauli blocking and nuclear binding effects with the g matrix and the relativistic effect of nucleon mass reduction in the nuclei are also discussed..
22. K. Sekiguchi, Y. Wada, A. Watanabe, D. Eto, T. Akieda, H. Kon, K. Miki, N. Sakamoto, H. Sakai, M. Sasano, Y. Shimizu, H. Suzuki, T. Uesaka, Y. Yanagisawa, M. Dozono, S. Kawase, Y. Kubota, C.S. Lee, K. Yako, Y. Maeda, S. Kawakami, T. Yamamoto, S. Sakaguchi, T. Wakasa, J. Yasuda, A. Ohkura, Y. Shindo, M. Tabata, E. Milman, S. Chebotaryov, H. Okamura, and T.L. Tang, Deuteron Analyzing Powers for dp Elastic Scattering at Intermediate Energies and Three- Nucleon Forces, Few-Body Systems, 58, 48, 58, 48, 2017.01, We have measured a complete set of deuteron analyzing powers in deuteron–proton elastic scattering at 190, 250, and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon–nucleon forces together with the Tucson-Melbourne’99, and UrbanaIX three nucleon forces. The data are also presented with the calculations based on the N4LO NN potentials of the chiral effective field theory..
23. J. Yasuda, M. Sasano, R.G.T. Zegers, H. Baba, W. Chao, M. Dozono, N. Fukuda, N. Inabe, T. Isobe, G. Jhang, D. Kameda, T. Kubo, M. Kurata-Nishimura, E. Milman, T. Motobayashi, H. Otsu, V. Panin, W. Powell, H. Sakai, M. Sako, H. Sato, Y. Shimizu, L. Stuhl, H. Suzuki, S. Tangwancharoen, H. Takeda, T. Uesaka, K. Yoneda, J. Zenihiro, T. Kobayashi, T. Sumikama, T. Tako, T. Nakamura, Y. Kondo, Y. Togano, M. Shikata, J. Tsubota, K. Yako, S. Shimoura, S. Ota, S. Kawase, Y. Kubota, M. Takaki, S. Michi- masa, K. Kisamori, C.S. Lee, and H. Tokieda, M. Kobayashi, S. Koyama, N. Kobayashi, T. Wakasa, S. Sakaguchi, A. Krasznahorkay, T. Murakami, N. Nakatsuka, M. Kaneko, Y. Matsuda, D. Mucher, S. Reichert, D. Bazin, and J.W. Lee, Inverse kinematics (p, n) reactions studies using the WINDS slow neutron detector and the SAMURAI spectrometer
, Nucl. Instrum. Methods Phys. Res. B, 376, 393, 376, 393, 2016.06, We have combined the low-energy neutron detector WINDS (Wide-angle Inverse-kinematics Neutron Detectors for SHARAQ) and the SAMURAI spectrometer at RIKEN Nishina Center RI Beam Factory (RIBF) in order to perform ðp; nÞ reactions in inverse kinematics for unstable nuclei in the mass region around A $ 100. In this setup, WINDS is used for detecting recoil neutrons and the SAMURAI spectrom- eter is used for tagging decay channel of heavy residue. The first experiment by using the setup was performed to study Gamow–Teller transitions from 132Sn in April 2014. The atomic number Z and mass-to-charge ratio A=Q of the beam residues were determined from the measurements of time of flight, magnetic rigidity and energy loss. The obtained A=Q and Z resolutions were rA=Q 1⁄4 0:14% and rZ 1⁄4 0:22, respectively. Furthermore, owing to the large momentum acceptance (50%) of SAMURAI, the beam residues associated with the c, 1n and 2n decay channel were measured in the same magnetic field setting. The kinematic loci of the measured recoil neutron energy and laboratory angle are clearly seen. It shows that the excitation energy up to about 20 MeV can be reconstructed..
24. J. Yasuda, M. Sasano, R. G.T. Zegers, H. Baba, W. Chao, M. Dozono, N. Fukuda, N. Inabe, T. Isobe, G. Jhang, D. Kameda, T. Kubo, M. Kurata-Nishimura, E. Milman, T. Motobayashi, H. Otsu, V. Panin, W. Powell, H. Sakai, M. Sako, H. Sato, Y. Shimizu, L. Stuhl, H. Suzuki, S. Tangwancharoen, H. Takeda, T. Uesaka, K. Yoneda, J. Zenihiro, T. Kobayashi, T. Sumikama, T. Tako, T. Nakamura, Y. Kondo, Y. Togano, M. Shikata, J. Tsubota, K. Yako, S. Shimoura, S. Ota, S. Kawase, Y. Kubota, M. Takaki, S. Michimasa, K. Kisamori, C. S. Lee, H. Tokieda, M. Kobayashi, S. Koyama, N. Kobayashi, T. Wakasa, S. Sakaguchi, A. Krasznahorkay, T. Murakami, N. Nakatsuka, M. Kaneko, Y. Matsuda, D. Mucher, S. Reichert, D. Bazin, J. W. Lee, Inverse kinematics (p, n) reactions studies using the WINDS slow neutron detector and the SAMURAI spectrometer, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 10.1016/j.nimb.2016.02.007, 376, 393-396, 2016.06, We have combined the low-energy neutron detector WINDS (Wide-angle Inverse-kinematics Neutron Detectors for SHARAQ) and the SAMURAI spectrometer at RIKEN Nishina Center RI Beam Factory (RIBF) in order to perform (p,n) reactions in inverse kinematics for unstable nuclei in the mass region around A∼100. In this setup, WINDS is used for detecting recoil neutrons and the SAMURAI spectrometer is used for tagging decay channel of heavy residue. The first experiment by using the setup was performed to study Gamow-Teller transitions from 132Sn in April 2014. The atomic number Z and mass-to-charge ratio A/Q of the beam residues were determined from the measurements of time of flight, magnetic rigidity and energy loss. The obtained A/Q and Z resolutions were σA/Q=0.14% and σZ=0.22, respectively. Furthermore, owing to the large momentum acceptance (50%) of SAMURAI, the beam residues associated with the γ, 1n and 2n decay channel were measured in the same magnetic field setting. The kinematic loci of the measured recoil neutron energy and laboratory angle are clearly seen. It shows that the excitation energy up to about 20 MeV can be reconstructed..
25. K. Harada, T. Aoki, K. Kato, H. Kawamura, T. Inoue, T. Aoki, A. Uchiyama, K. Sakamoto, S. Ito, M. Itoh, T, Hayamizu, A. Hatakeyama, K. Hatanaka, T. Wakasa, and Y. Sakemi, Development of a Magneto-Optical Trap System of Francium Atoms for the Electron Electric-Dipole-Moment Search
, J. Phys. Conf. Ser., 691, 012017, 691, 012017, 2016.03, The finite value of an electron electric dipole moment (eEDM) provides the direct evidence for the violation of time reversal symmetry. Fr atoms, whose enhancement factor is 895, trapped by laser cooling and trapping techniques are one of the strongest candidates for measuring the eEDM. We are constructing a beamline for measuring the eEDM using laser- cooled Fr atoms at the Cyclotron and Radioisotope Center. We have developed laser light sources including the frequency stabilization system and a magneto-optical trap system for Fr atoms. As the Fr production requires the cyclotron operation, we also use Rb atoms whose chemical properties are similar to those of the Fr atoms. Thus, the Rb beam is utilized for optimizing the operation parameters of the entire apparatus. We have also developed the laser light sources for Rb atoms and observed the beat signal for frequency stabilization of the source using the frequency offset locking method..
26. K. Harada, T. Aoki, K. Kato, H. Kawamura, T. Inoue, T. Aoki, A. Uchiyama, K. Sakamoto, S. Ito, M. Itoh, T. Hayamizu, A. Hatakeyama, K. Hatanaka, T. Wakasa, Y. Sakemi, Development of a Magneto-Optical Trap System of Francium Atoms for the Electron Electric-Dipole-Moment Search, 24th Annual International Laser Physics Workshop, LPHYS 2015 Journal of Physics: Conference Series, 10.1088/1742-6596/691/1/012017, 691, 1, 2016.03, The finite value of an electron electric dipole moment (eEDM) provides the direct evidence for the violation of time reversal symmetry. Fr atoms, whose enhancement factor is 895, trapped by laser cooling and trapping techniques are one of the strongest candidates for measuring the eEDM. We are constructing a beamline for measuring the eEDM using laser- cooled Fr atoms at the Cyclotron and Radioisotope Center. We have developed laser light sources including the frequency stabilization system and a magneto-optical trap system for Fr atoms. As the Fr production requires the cyclotron operation, we also use Rb atoms whose chemical properties are similar to those of the Fr atoms. Thus, the Rb beam is utilized for optimizing the operation parameters of the entire apparatus. We have also developed the laser light sources for Rb atoms and observed the beat signal for frequency stabilization of the source using the frequency offset locking method..
27. K. Harada, T. Aoki, S. Ezure, K. Kato, T. Hayamizu, H. Kawamura, T. Inoue, H. Arikawa, T. Ishikawa, T. Aoki, A. Uchiyama, K. Sakamoto, S. Ito, M. Itoh, S. Ando, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H.S. Nataraj, Y. Shimizu, T. Sato, T. Wakasa, H.P. Yoshida, and Y. Sakemi , Laser frequency locking with 46 GHz offset using an electro-optic modulator for magneto- optical trapping of francium atoms, Appl. Opt., 55, 5, 1164, 55, 1164, 2016.02, We demonstrate frequency offset locking between two laser sources using a waveguide-type electro-optic modulator (EOM) with 10th-order sidebands for magneto-optical trapping of Fr atoms. The frequency locking error signal was successfully obtained by performing delayed self-homodyne detection of the beat signal between the repumping frequency and the 10th-order sideband component of the trapping light. Sweeping the trapping- light and repumping-light frequencies with keeping its frequency difference of 46 GHz was confirmed over 1 GHz by monitoring the Doppler absorption profile of I 2 . This technique enables us to search for a resonance frequency of magneto-optical trapping of Fr..
28. Y. Wada, K. Sekiguchi, U. Gebauer, J. Miyazaki, T. Taguchi, M. Dozono, H. Sakai, N. Sakamoto, M. Sasano, Y. Shimizu, H. Suzuki, T. Uesaka, S. Kawase, Y. Kubota, C.S. Lee, T.L. Tang, K. Yako, Y. Maeda, K. Miki, H. Okamura, S. Sakaguchi, and T. Wakasa, Study of Three-Nucleon Force Effect via Few-Nucleon Scattering, Int. J. Mod. Phys. Conf. Ser., 40, 1660070, 40, 1660070, 2016.02, A complete set of deuteron analyzing powers for elastic deuteron-proton(dp) scattering at 250 and 294 MeV/nucleon has been measured. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with three- nucleon forces..
29. K. Harada, T. Aoki, S. Ezure, K. Kato, T. Hayamizu, H. Kawamura, T. Inoue, H. Arikawa, T. Ishikawa, T. Aoki, A. Uchiyama, K. Sakamoto, S. Ito, M. Itoh, S. Ando, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H. S. Nataraj, Y. Shimizu, T. Sato, T. Wakasa, H. P. Yoshida, Y. Sakemi, Laser frequency locking with 46 GHz offset using an electro-optic modulator for magneto-optical trapping of francium atoms, Applied Optics, 10.1364/AO.55.001164, 55, 5, 1164-1169, 2016.02, We demonstrate frequency offset locking between two laser sources using a waveguide-type electro-optic modulator (EOM) with 10th-order sidebands for magneto-optical trapping of Fr atoms. The frequency locking error signal was successfully obtained by performing delayed self-homodyne detection of the beat signal between the repumping frequency and the 10th-order sideband component of the trapping light. Sweeping the trappinglight and repumping-light frequencies with keeping its frequency difference of 46 GHz was confirmed over 1 GHz by monitoring the Doppler absorption profile of I 2. This technique enables us to search for a resonance frequency of magneto-optical trapping of Fr..
30. M. Sasano, J. Yasuda, R.G.T. Zegers, H. Baba, W. Chao, M. Dozono, N. Fukuda, N. Inabe, T. Isobe, G. Jhang, D. Kamaeda, T. Kubo, M. Kurata-Nishimura, E. Milman, T. Motobayashi, H. Otsu, V. Panin, W. Powell, H. Sakai, M. Sako, H. Sato, Y. Shimizu, L. Stuhl, H. Suzuki, S. Tangwancharoen, H. Takeda, T. Uesaka, K. Yoneda, J. Zenihiro, T. Kobayashi, T. Sumikama, T. Tako, T. Nakamura, Y. Kondo, Y. Togano, M. Shikata, J. Tsubota, K. Yako, S. Shimoura, S. Ota, S. Kawase, Y. Kubota, M. Takaki, S. Michi- masa, K. Kisamori, C.S. Lee, H. Tokieda, M. Kobayashi, S. Koyama, N. Kobayashi, T. Wakasa, S. Sakaguchi, A. Krasznahorkay, T. Murakami, N. Nakatsuka, M. Kaneko, Y. Matsuda, D. Mucher, S. Reichert, D. Bazin, and J.W. Lee, Study of Gamow-Teller transitions from 132Sn via the (p,n) reaction at 220 MeV/u in inverse kinematics
, EPJ Web Conf., 107, 06003, 107, 06006, 2016.01, The charge-exchange (p,n) reaction at 220 MeV has been measured to extract the strength distribution of Gamow-Teller transitions from the doubly magic unstable nucleus 132Sn. A recently developed experimental technique of measuring the (p,n) reaction in inverse kinematics has been applied to the study of unstable nuclei in the mass region around A∼100 for the first time. We have combined the low-energy neutron detector WINDS and the SAMURAI spectrometer at the RIKEN radioactive isotope beam factory (RIBF). The particle identification plot for the reaction residues obtained by the spectrometer provides the clear separation of the CE reaction channel from other background events, enabling us to identify kinematic curves corresponding the (p, n) reaction. Further analysis to reconstruct the excitation energy spectrum is ongoing..
31. M. Sasano, J. Yasuda, R. G.T. Zegers, H. Baba, W. Chao, M. Dozono, N. Fukuda, N. Inabe, T. Isobe, G. Jhang, D. Kamaeda, T. Kubo, M. Kurata-Nishimura, E. Milman, T. Motobayashi, H. Otsu, V. Panin, W. Powell, H. Sakai, M. Sako, H. Sato, Y. Shimizu, L. Stuhl, H. Suzuki, S. Tangwancharoen, H. Takeda, T. Uesaka, K. Yoneda, J. Zenihiro, T. Kobayashi, T. Sumikama, T. Tako, T. Nakamura, Y. Kondo, Y. Togano, M. Shikata, J. Tsubota, K. Yako, S. Shimoura, S. Ota, S. Kawase, Y. Kubota, M. Takaki, S. Michimasa, K. Kisamori, C. S. Lee, H. Tokieda, M. Kobayashi, S. Koyama, N. Kobayashi, T. Wakasa, S. Sakaguchi, A. Krasznahorkay, T. Murakami, N. Nakatsuka, M. Kaneko, Y. Matsuda, D. Mucher, S. Reichert, D. Bazin, J. W. Lee, Study of Gamow-Teller transitions from 132Sn via the (p, n) reaction at 220 MeV/u in inverse kinematics, 7th International Conference on Nuclear Structure and Related Topics, NSRT 2015 EPJ Web of Conferences, 10.1051/epjconf/201610706003, 107, 2016.01, The charge-exchange (p, n) reaction at 220 MeV has been measured to extract the strength distribution of Gamow-Teller transitions from the doubly magic unstable nucleus 132Sn. A recently developed experimental technique of measuring the (p, n) reaction in inverse kinematics has been applied to the study of unstable nuclei in the mass region around A ∼ 100 for the first time. We have combined the low-energy neutron detector WINDS and the SAMURAI spectrometer at the RIKEN radioactive isotope beam factory (RIBF). The particle identification plot for the reaction residues obtained by the spectrometer provides the clear separation of the CE reaction channel from other background events, enabling us to identify kinematic curves corresponding the (p, n) reaction. Further analysis to reconstruct the excitation energy spectrum is ongoing..
32. S. Kawase, T.L. Tang, T. Uesaka, D. Beaumel, M. Dozono, T. Fujii, T. Fukunaga, N. Fukuda, A. Galindo-Uribarri, S.H. Hwang, N. Inabe, D. Kameda, T. Kawahara, W. Kim, K. Kisamori, M. Kobayashi, T. Kubo, Y. Kubota, K. Kusaka, C.S. Lee, Y. Maeda, H. Matsubara, S. Michimasa, H. Miya, T. Noro, A. Obertelli, S. Ota, E. Padilla-Rodal, S. Sakaguchi, H. Sakai, M. Sasano, S. Shimoura, S. Stepanyan, H. Suzuki, M. Takaki, H. Takeda, H. Tokieda, T. Wakasa, T. Wakui, K. Yako, Y. Yanagisawa, J. Yasuda, R. Yokoyama, K. Yoshida, and J. Zenihiro, Spectroscopy of Single-Particle States in Oxygen Isotopes via (p⃗, 2p) Reaction, JPS Conf. Proc., 6, 020003, 6, 020003, 2015.06, The goal of this study is to determine the spin-orbit splitting of 1p proton orbits in oxygen isotopes. An experiment for the exclusive measurement of the (⃗p, 2p) reaction was carried out at the SHARAQ beamline at RI Beam Factory, RIKEN. Beam containing oxygen unstable isotopes with the kinetic energy of around 250 MeV bombarded a polarized solid proton target. Proton separation energy was calculated from the momentum vectors of two scattered protons. For 14O(⃗p, 2p), the transition strengths of the 14O(⃗p, 2p)13N reaction leading to the ground state and excited states were separated by the particle identification of the residual nucleus. As a result, 6.3 MeV of 1p spin-orbit splitting of 14O was obtained..
33. WAKASA TOMOTSUGU, Spectroscopy of single-particle states in oxygen isotopes via the AO(p(pol), pN) reaction with polarized protons, CNS-REP-93, Ann.Report 2013, p.9 (2015), 55, 2015.04.
34. WAKASA TOMOTSUGU, Analysis of proton-proton elastic scattering in SHARAQ04 experiment, CNS-REP-93, Ann.Report 2013, p.11 (2015), 2015.04.
35. T. Inoue, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Ishikawa, M. Itoh, K. Kato, H. Kawamura, A. Uchiyama, T. Aoki, K. Asahi, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H.S. Nataraj, T. Sato, Y. Shimizu, T. Wakasa, H.P. Yoshida, A. Yoshimi, and Y. Sakemi, Experimental search for the electron electric dipole moment with laser cooled francium
atoms, Hyperfine Interact., 230, 157, 107, 06006, 2015.04.
36. T. Inoue, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Ishikawa, M. Itoh, K. Kato, H. Kawamura, A. Uchiyama, T. Aoki, K. Asahi, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H. S. Nataraj, T. Sato, Y. Shimizu, T. Wakasa, H. P. Yoshida, A. Yoshimi, Y. Sakemi, Experimental search for the electron electric dipole moment with laser cooled francium atoms, Hyperfine Interactions, 10.1007/s10751-014-1100-1, 231, 1-3, 157-162, 2015.04, A laser cooled heavy atom is one of the candidates to search for the permanent electric dipole moment (EDM) of the electron due to the enhancement mechanism and its long coherence time. The laser cooled francium (Fr) factory has been constructed to perform the electron EDM search at the Cyclotron and Radioisotope Center, Tohoku University. The present status of Fr production and the EDM measurement system is presented..
37. K. Sekiguchi, H. Okamura, Y. Wada, J. Miyazaki, T. Taguchi, U. Gebauer, M. Dozono, S. Kawase, Y. Kubota, C. S. Lee, Y. Maeda, T. Mashiko, K. Miki, S. Sakaguchi, H. Sakai, N. Sakamoto, M. Sasano, Y. Shimizu, K. Takahashi, R. Tang, T. Uesaka, T. Wakasa, K. Yako, Complete Set of Deuteron Analyzing Powers for dp Elastic Scattering at Intermediate Energies and Three Nucleon Forces, Few-Body Systems, 10.1007/s00601-014-0867-6, 55, 8-10, 717-719, 2014.08, With the aim of clarifying roles of the 3NFs in nuclei experimental programs with the polarized deuteron beam at intermediate energies are in progress at RIKEN RI Beam Factory. As the first step, we have measured a complete set of deuteron analyzing powers in deuteron-proton elastic scattering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne'99, and UrbanaIX three nucleon forces..
38. Y. Maeda, T. Saito, H. Miyasako, T. Uesaka, S. Ota, S. Kawase, T. Kikuchi, H. Tokieda, T. Kawabata, K. Yako, T. Wakasa, S. Sakaguchi, R. Chen, H. Sakaguchi, T. Shima, T. Suzuki, A. Tamii, Measurement of the 2H(p, n) Breakup Reaction at 170 MeV and the Three-Nucleon Force Effects, Few-Body Systems, 10.1007/s00601-014-0868-5, 55, 8-10, 729-732, 2014.08, The effects of three nucleon force (3NF) have been actively studied via the nucleon-deuteron (Nd) scattering states. The differential cross sections and the vector analyzing powers Ay of the 2H(p, n) inclusive breakup reaction at 170 MeV were measured for the study of 3NF effects in the intermediate energy region. The polarized proton beam of 170 MeV was injected to the deuterated polyethylene (CD2) target and the energy of scattered neutrons were measured by using TOF method. The data were compared with the Faddeev calculations based on modern nucleon-nucleon (NN) forces with and without the 3NF. Concerning the differential cross sections, we can see large discrepancies between the data and the calculations in the region of scattered neutron energies are low, which is similar to the results of the 2H(p, p) inclusive breakup reaction at 250 MeV..
39. K. Sekiguchi, Y. Wada, J. Miyazaki, H. Witała, M. Dozono, U. Gebauer, J. Golak, H. Kamada, S. Kawase, Y. Kubota, C. S. Lee, Y. Maeda, T. Mashiko, K. Miki, A. Nogga, H. Okamura, T. Saito, H. Sakai, S. Sakaguchi, N. Sakamoto, M. Sasano, Y. Shimizu, R. Skibiński, H. Suzuki, T. Taguchi, K. Takahashi, T. L. Tang, T. Uesaka, T. Wakasa, K. Yako, Complete set of deuteron analyzing powers for dp elastic scattering at 250-294 MeV/nucleon and the three-nucleon force, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.89.064007, 89, 6, 2014.06, A complete high-precision set of deuteron analyzing powers for elastic deuteron-proton (dp) scattering at 250 and 294 MeV/nucleon has been measured. These data and previously existing data sets for the cross section at similar energies are compared to the results of three-nucleon Faddeev calculations based on modern nucleon-nucleon (NN) potentials alone or combined with two models of three-nucleon forces: the Tucson-Melbourne 99 and Urbana IX. Large discrepancies between pure NN theory and data, which are not resolved by the current three-nucleon forces, were found at c.m. backward angles θc.m.120 for all the deuteron analyzing powers and the cross section. Because only small relativistic effects were found for the deuteron analyzing powers and the cross section, the inclusion of short-range components of the three-nucleon force is probably required to get a better description of the data..
40. WAKASA TOMOTSUGU, Observation of Low- and High-Energy Gamow-Teller Phonon Excitations in Nuclei, Phys.Rev.Lett. 112, 112502 (2014), 112, 112502, 2014.04.
41. WAKASA TOMOTSUGU, J. Yasuda, T. Fukunaga, Spectroscopy of single-particle states in oxygen isotopes via the (p(pol) pN) reaction with polarized protons, CNS-REP-92, p.13 (2014), 92, 13, 2014.04.
42. WAKASA TOMOTSUGU, Measurement of the 2H(p, n) Breakup Reaction at 170 MeV and the Three-Nucleon Force Effects, Few-Body Systems 55, 729 (2014), 55, 729, 2014.04.
43. WAKASA TOMOTSUGU, Complete set of deuteron analyzing powers for dp elastic scattering at 250-294 MeV/nucleon and the three-nucleon force, Phys.Rev. C 89, 064007 (2014), 89, 064007, 2014.04.
44. WAKASA TOMOTSUGU, Complete Set of Deuteron Analyzing Powers for dp Elastic Scattering at Intermediate Energies and Three Nucleon Forces, Few-Body Systems 55, 717 (2014), 55, 717, 2014.04.
45. K. Sekiguchi, H. Okamura, Y. Wada, J. Miyazaki, T. Taguchi, U. Gebauer, M. Dozono, S. Kawase, Y. Kubota, C. S. Lee, Y. Maeda, T. Mashiko, K. Miki, S. Sakaguchi, H. Sakai, N. Sakamoto, M. Sasano, Y. Shimizu, K. Takahashi, R. Tang, T. Uesaka, T. Wakasa, K. Yako, Complete set of deuteron analyzing powers for dp elastic scattering at intermediate energies and three nucleon forces, 2013 International Nuclear Physics Conference, INPC 2013 EPJ Web of Conferences, 10.1051/epjconf/20146603076, 66, 2014.04, Experimental programs with polarized deuterons beams at intermediate energies are in progress at RIKEN RI Beam Factory. We have measured a complete set of deuteron analyzing powers in deuteron-proton elastic scattering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne'99, and UrbanaIX three nucleon forces..
46. Tomoya Sato, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, K. Kato, T. Kato, H. Kawamura, H. S. Nataraj, A. Uchiyama, T. Aoki, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, Y. Shimizu, T. Wakasa, H. P. Yoshida, Y. Sakemi, Development of francium atomic beam for the search of the electron electric dipole moment, 2013 International Nuclear Physics Conference, INPC 2013 EPJ Web of Conferences, 10.1051/epjconf/20146605019, 66, 2014.04, For the measurement of the electron electric dipole moment using Fr atoms, a Fr ion-atom conversion is one of the most critical process. An ion-atom converter based on the "orthotropic" type of Fr source has been developed. This converter is able to convert a few keV Fr ion beam to a thermal atomic beam using a cycle of the surface ionization and neutralization. In this article, the development of the converter is reported..
47. T. Inoue, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Ishikawa, M. Itoh, K. Kato, T. Kato, H. Kawamura, H. S. Nataraj, T. Sato, A. Uchiyama, T. Aoki, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, Y. Shimizu, T. Wakasa, H. P. Yoshida, Y. Sakemi, Development of the measurement system for the search of an electric dipole moment of the electron with laser-cooled francium atoms, 2013 International Nuclear Physics Conference, INPC 2013 EPJ Web of Conferences, 10.1051/epjconf/20146605008, 66, 2014.04, We plan to measure the permanent electric dipole moment (EDM) of the electron, which has the sensitivity to the CP violation in theories beyond the standard model by using the laser-cooled francium (Fr) atom. This paper reports the present status of the EDM measurement system. A high voltage application system was constructed in order to produce the strong electric field (100 kV/cm) needed for the experiment. After conditioning, the leakage current was 10 pA when a high voltage of 43 kV was applied. Also, a drift of an environmental field was measured at the planned location of the Fr-EDM experiment. The drift is suppressed at present down to the level of 10 pT by installing a 4-layermagnetic shield. Improvements are still needed to reach the required field stability of 1 fT..
48. Hirokazu Kawamura, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, K. Kato, T. Kato, H. S. Nataraj, T. Sato, A. Uchiyama, T. Aoki, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, Y. Shimizu, T. Wakasa, H. P. Yoshida, Y. Sakemi, Search for a permanent EDM using laser cooled radioactive atom, 2013 International Nuclear Physics Conference, INPC 2013 EPJ Web of Conferences, 10.1051/epjconf/20146605009, 66, 2014.04, The search for the electric-dipole moment (EDM) of laser-cooled francium (Fr) atoms could lead to a measurement for the electron EDM. It is predicted that the electron EDM would be enhanced by approximately three orders of magnitude in heavy atoms such as Fr. Laser-cooling and trapping techniques are expected to suppress statistical and systematic errors in precision measurements. The magneto-optical trap was achieved using stable rubidium in a developing factory of laser-cooled radioactive atoms. In light of the results from the rubidium experiments, we found that an upgrade of each apparatus is preferred for Fr trapping..
49. K. Sekiguchi, H. Okamura, Y. Wada, J. Miyazaki, T. Taguchi, U. Gebauer, M. Dozono, S. Kawase, Y. Kubota, C.S. Lee, Y. Maeda, T. Mashiko, K. Miki, S. Sakaguchi, H. Sakai, N. Sakamoto, M. Sasano, Y. Shimizu, K. Takahashi, R. Tang, T. Uesaka, T. Wakasa, and K. Yako, Complete Set of Deuteron Analyzing Powers for dp Elastic Scattering at Intermediate Energies and Three Nucleon Forces, EPJ Web Conf. , 66, 03076, 66, 03076, 2014.03, Experimental programs with polarized deuterons beams at intermediate energies are in progress at RIKEN RI Beam Factory. We have measured a complete set of deuteron analyzing powers in deuteron–proton elastic scattering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon–nucleon forces together with the Tucson-Melbourne’99, and UrbanaIX three nucleon forces.
.
50. T. Inoue, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Ishikawa, M. Itoh, K. Kato, T. Kato, H. Kawamura, H.S. Nataraj, T. Sato, A. Uchiyama, T. Aoki, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, Y. Shimizu, T. Wakasa, H.P. Yoshida, and Y. Sakemi, Development of the Measurement System for the Search of an Electric Dipole Moment of the Electron with Laser-Cooled Francium Atoms, EPJ Web Conf., 66, 05008, 66, 05008, 2014.03.
51. H. Kawamura, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, K. Kato, T. Kato, H.S. Nataraj, T. Sato, A. Uchiyama, T. Aoki, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, Y. Shimizu, T. Wakasa, H.P. Yoshida, and Y. Sakemi, Search for a permanent EDM using laser cooled radioactive atom
, EPJ Web Conf., 66, 05009, 66, 05009, 2014.03, The search for the electric-dipole moment (EDM) of laser-cooled francium (Fr) atoms could lead to a measurement for the electron EDM. It is predicted that the electron EDM would be enhanced by approximately three orders of magnitude in heavy atoms such as Fr. Laser-cooling and trapping techniques are expected to suppress statistical and systematic errors in precision measurements. The magneto-optical trap was achieved using stable rubidium in a developing factory of laser-cooled radioactive atoms. In light of the results from the rubidium experiments, we found that an upgrade of each apparatus is preferred for Fr trapping..
52. T. Sato, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, K. Kato, T. Kato, H. Kawamura, H.S. Nataraj, A. Uchiyama, T. Aoki, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, Y. Shimizu, T. Wakasa, H.P. Yoshida, and Y. Sakemi, Development of francium atomic beam for the search of the electron electric dipole moment, EPJ Web Conf., 66, 05019, 66, 05019, 2014.03, For the measurement of the electron electric dipole moment using Fr atoms, a Fr ion-atom conversion is one of the most critical process. An ion-atom converter based on the “orthotropic” type of Fr source has been developed. This converter is able to convert a few keV Fr ion beam to a thermal atomic beam using a cycle of the surface ionization and neutralization. In this article, the development of the converter is reported..
53. Y. Fujita, H. Fujita, T. Adachi, C. L. Bai, A. Algora, G. P.A. Berg, P. Von Brentano, G. Colò, M. Csatlós, J. M. Deaven, E. Estevez-Aguado, C. Fransen, D. De Frenne, K. Fujita, E. Ganioǧlu, C. J. Guess, J. Gulyás, K. Hatanaka, K. Hirota, M. Honma, D. Ishikawa, E. Jacobs, A. Krasznahorkay, H. Matsubara, K. Matsuyanagi, R. Meharchand, F. Molina, K. Muto, K. Nakanishi, A. Negret, H. Okamura, H. J. Ong, T. Otsuka, N. Pietralla, G. Perdikakis, L. Popescu, B. Rubio, H. Sagawa, P. Sarriguren, C. Scholl, Y. Shimbara, Y. Shimizu, G. Susoy, T. Suzuki, Y. Tameshige, A. Tamii, J. H. Thies, M. Uchida, T. Wakasa, M. Yosoi, R. G.T. Zegers, K. O. Zell, J. Zenihiro, Observation of low- and high-energy gamow-teller phonon excitations in nuclei, Physical Review Letters, 10.1103/PhysRevLett.112.112502, 112, 11, 2014.03, Gamow-Teller (GT) transitions in atomic nuclei are sensitive to both nuclear shell structure and effective residual interactions. The nuclear GT excitations were studied for the mass number A=42, 46, 50, and 54 "f-shell" nuclei in (He3, t) charge-exchange reactions. In the Ca42→Sc42 reaction, most of the GT strength is concentrated in the lowest excited state at 0.6 MeV, suggesting the existence of a low-energy GT phonon excitation. As A increases, a high-energy GT phonon excitation develops in the 6-11 MeV region. In the Fe54→Co54 reaction, the high-energy GT phonon excitation mainly carries the GT strength. The existence of these two GT phonon excitations are attributed to the 2 fermionic degrees of freedom in nuclei..
54. H. Arikawa, S. Ando, T. Aoki, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, H. Kawamura, K. Kato, T. Kato, A. Uchiyama, T. Aoki, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H.S. Nataraj, T. Sato, Y. Shimizu, T. Wakasa, H.P. Yoshida, and Y. Sakemi, Radioactive ion beam transportation for the fundamental symmetry study with laser- trapped atoms, Rev. Sci. Instrum., 85, 02A732, 85, 02A732, 2014.02, The search for the violation of the fundamental symmetry in a radioactive atom is the promising candidate for precision tests of the standard model and its possible extensions. The subtle signal arising from the symmetry violation is enhanced in heavy atoms, such as a francium (Fr). To realize high precision measurements, a large amount of radioactive isotopes is required. The Fr is produced via a nuclear fusion reaction using a melted gold target with a (18)O primary beam at Cyclotron and Radioisotope Center, Tohoku University. The maximum extraction efficiency of the Fr ion was achieved at approximately 35%. The beam line consists of an electrostatic deflector, three electrostatic quadrupole triplets to the measurement area at 10 m away from the reaction point, and several beam diagnosis systems. We optimized parameters of the beam line..
55. Hiroshi Arikawa, S. Ando, T. Aoki, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, H. Kawamura, K. Kato, T. Kato, A. Uchiyama, T. Aoki, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H. S. Nataraj, T. Sato, Y. Shimizu, T. Wakasa, H. P. Yoshida, Y. Sakemi, Radioactive ion beam transportation for the fundamental symmetry study with laser-trapped atoms, Review of Scientific Instruments, 10.1063/1.4852218, 85, 2, 2014.02, The search for the violation of the fundamental symmetry in a radioactive atom is the promising candidate for precision tests of the standard model and its possible extensions. The subtle signal arising from the symmetry violation is enhanced in heavy atoms, such as a francium (Fr). To realize high precision measurements, a large amount of radioactive isotopes is required. The Fr is produced via a nuclear fusion reaction using a melted gold target with a 18O primary beam at Cyclotron and Radioisotope Center, Tohoku University. The maximum extraction efficiency of the Fr ion was achieved at approximately 35%. The beam line consists of an electrostatic deflector, three electrostatic quadrupole triplets to the measurement area at 10 m away from the reaction point, and several beam diagnosis systems. We optimized parameters of the beam line..
56. K. Sekiguchi, H. Okamura, Y. Wada, J. Miyazaki, T. Taguchi, U. Gebauer, M. Dozono, S. Kawase, Y. Kubota, C.S. Lee, Y. Maeda, T. Mashiko, K. Miki, S. Sakaguchi, H. Sakai, N. Sakamoto, M. Sasano, Y. Shimizu, K. Takahashi, R. Tang, T. Uesaka, T. Wakasa, and K. Yako, Complete set of deuteron analyzing powers for dp elastic scattering at intermediate ener- gies
, Phys. Part. Nucl., 45, 190, 45, 190, 2014.01, With the aim of clarifying roles of the 3NFs in nuclei experimental programs with polarized deu�� terons beams at intermediate energies are in progress at RIKEN RI Beam Factory. As the first step, we have measured a complete set of deuteron analyzing powers (iT11, T20, T21, T22) in deuteron–proton elastic scat�� tering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon–nucleon forces together with the Tucson��Melbourne'99, and UrbanaIX three nucleon forces..
57. K. Sekiguchi, H. Okamura, Y. Wada, J. Miyazaki, T. Taguchi, U. Gebauer, M. Dozono, S. Kawase, Y. Kubota, C. S. Lee, Y. Maeda, T. Mashiko, K. Miki, S. Sakaguchi, H. Sakai, N. Sakamoto, M. Sasano, Y. Shimizu, K. Takahashi, R. Tang, T. Uesaka, T. Wakasa, K. Yako, Complete set of deuteron analyzing powers for dp elastic scattering at intermediate energies, Physics of Particles and Nuclei, 10.1134/S1063779614010894, 45, 1, 190-192, 2014.01, With the aim of clarifying roles of the 3NFs in nuclei experimental programs with polarized deuterons beams at intermediate energies are in progress at RIKEN RI Beam Factory. As the first step, we have measured a complete set of deuteron analyzing powers (iT11, T20, T21, T22) in deuteron-proton elastic scattering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne'99, and UrbanaIX three nucleon forces..
58. Hirokazu Kawamura, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, T. Kato, T. Sato, T. Aoki, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H. S. Nataraj, Y. Shimizu, T. Wakasa, H. P. Yoshida, Y. Sakemi, Laser-cooled radioactive francium factory at CYRIC, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 10.1016/j.nimb.2013.07.038, 317, PART B, 582-585, 2013.12, A factory of laser-cooled francium (Fr) atoms is being developed to search for the electric dipole moment (EDM) of the electron. The factory has achieved the production of Fr ions of 9×105 particles/s and transport with a transmission efficiency of 2%. In pilot experiments, the magneto-optical trapping of rubidium (Rb) has been performed using a new ion-to-atom converter. To achieve the Fr trap, the development and design of each of the factory's components are in progress..
59. S. Almaraz-Calderon, W. P. Tan, A. Aprahamian, M. Beard, G. P.A. Berg, B. Bucher, M. Couder, J. Görres, S. O'Brien, D. Patel, A. Roberts, K. Sault, M. Wiescher, C. R. Brune, T. N. Massey, Kunihiro Fujita, K. Hatanaka, D. Ishiwaka, H. Matsubara, H. Okamura, H. J. Ong, Y. Sakemi, Y. Shimizu, T. Suzuki, Y. Tameshige, A. Tamii, J. Zenihiro, T. Kubo, Y. Namiki, Y. Ohkuma, Y. Shimbara, S. Suzuki, R. Watanabe, R. Yamada, T. Adachi, Y. Fujita, H. Fujita, M. Dozono, T. Wakasa, Erratum
Level structure of 30S and its importance in the 26Si(α,p)29P and 29P(p,γ)30S reaction rates (Physical Review C - Nuclear Physics (2012) 86 (065805)), Physical Review C - Nuclear Physics, 10.1103/PhysRevC.88.059902, 88, 5, 2013.11.
60. Y. Wada, K. Sekiguchi, J. Miyazaki, T. Taguchi, M. Dozono, U. Gebauer, S. Kawase, Y. Kubota, C. S. Lee, Y. Maeda, T. Mashiko, K. Miki, S. Sakaguchi, H. Sakai, N. Sakamoto, M. Sasano, Y. Shimizu, K. Takahashi, R. Tang, T. Uesaka, T. Wakasa, K. Yako, Measurement of all Deuteron Analyzing Powers for d + p Elastic Scattering at 294 MeV/Nucleon, Few-Body Systems, 10.1007/s00601-013-0606-4, 54, 7-10, 1335-1338, 2013.08, We have measured all deuteron analyzing powers Ayd, Ayy, Axx, Axz for deuteron-proton elastic scattering at 294 MeV/nucleon in order to study the properties of three nucleon forces (3 NFs). Measurement was made at in an angular range of θc.m. = 35.6°-163.0°. Obtained data were compared with Faddeev calculations with and without the 3 NFs. At θc.m. ≲ 120° all the data have general agreement with the calculations, while the measured data at θc.m. ≳ 120° are not explained by any theoretical calculations. These results were consistent with those at 250 MeV/nucleon..
61. Y. Maeda, T. Saito, H. Miyasako, T. Uesaka, S. Ota, S. Kawase, T. Kikuchi, H. Tokieda, T. Kawabata, K. Yako, T. Wakasa, S. Sakaguchi, R. Chen, H. Sakaguchi, T. Shima, T. Suzuki, A. Tamii, Study of the Three-Nucleon Force Effects in the 2H(p, n) Breakup Reaction at 170 MeV, Few-Body Systems, 10.1007/s00601-012-0587-8, 54, 7-10, 1311-1314, 2013.08, For the study of three nucleon force (3NF) effects in the intermediate energy region, the differential cross sections and the vector analyzing power Ay were measured for the 2H(p, n) inclusive breakup reaction at 170 MeV. The polarized proton beam of 170 MeV was injected to the deuterated polyethylene (CD2) target and the energy of scattered neutrons were deduce by TOF method. The data was compared with the results of the Faddeev calculations with and without 3NFs. Concerning about the differential cross sections, we can see large discrepancies between the data and the calculations in the region where the energies of scattered neutrons are low, which are similar to the results of the 2H(p, p) inclusive breakup reaction at 250 MeV..
62. WAKASA TOMOTSUGU, Extraction of anti-analog giant dipole resonance and neutron skin thickness for 208Pb
, Prog. Theor. Exp. Phys. 063D02 (2013)., 063D02, 063D02, 2013.06.
63. Jumpei Yasuda, Tomotsugu Wakasa, Midori Okamoto, Masanori Dozono, Kichiji Hatanaka, Munetake Ichimura, Sho Kuroita, Yukie Maeda, Tetsuo Noro, Yasuhiro Sakemi, Masaki Sasano, Kentaro Yako, Extraction of anti-analog giant dipole resonance and neutron skin thickness for 208Pb, Progress of Theoretical and Experimental Physics, 10.1093/ptep/ptt038, 2013, 6, 2013.06, The anti-analog giant dipole resonance (AGDR) was separated from other excitations such as the spin-dipole resonance by multipole decomposition analysis of the 208Pb(→p,→n) reaction at a bombarding energy of Tp = 296MeV. The polarization transfer observables were found to be useful for carrying out this separation. The energy difference between the AGDR and the isobaric analog state (IAS)was determined to beΔE = 8.69 ± 0.36MeV,where the uncertainty includes both statistical and systematic contributions. Theoretical calculations using the proton-neutron relativistic quasi-particle random phase approximation predicted a strong correlation between ΔE and the neutron skin thickness ΔRpn. Under the assumption that the correlation predicted in this model is correct, the present ΔE value corresponds to a neutron skin thickness of ΔRpn = 0.216 ± 0.046 ± 0.015 fm, where the first and second uncertainties are the experimental and theoretical uncertainties, respectively..
64. T. Inoue, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Ishikawa, M. Itoh, T. Kato, H. Kawamura, H. S. Nataraj, T. Sato, T. Aoki, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, Y. Shimizu, Tomotsugu Wakasa, H. P. Yoshida, Y. Sakemi, Search for electron EDM with laser cooled radioactive atom, 8th China-Japan Joint Nuclear Physics Symposium, CJJNPS 2012 8th China-Japan Joint Nuclear Physics Symposium, CJJNPS 2012, 10.1063/1.4806789, 134-139, 2013.06, The permanent electric dipole moment (EDM) of the elementary particle has the sensitivity to the CP violation in the theories beyond the standard model (SM). The search for the EDM constitutes the stringent test to discriminate between the SM and beyond it. We plan to perform the electron EDM search by using the laser cooled francium (Fr) atom which has the largest enhancement factor of the electron EDM in the alkali atoms. In this paper, the present status of the laser cooled Fr factory that is being constructed at Cyclotron and Radioisotope Center (CYRIC), Tohoku University are reported..
65. T. Wakasa, M. Okamoto, M. Dozono, K. Hatanaka, M. Ichimura, S. Kuroita, Y. Maeda, H. Miyasako, T. Noro, T. Saito, Y. Sakemi, T. Yabe, K. Yako, Decomposing spin-dipole resonances by complete polarization transfer measurements, International Conference on Recent Trends in Nuclear Physics-2012, ICRTNP 2012 International Conference on Recent Trends in Nuclear Physics-2012, ICRTNP 2012, 10.1063/1.4801675, 46-51, 2013.05, We report measurements of cross sections and analyzing powers for reaction angles of θlab = 0.0°-10.0° and complete sets of polarization transfer observables and induced polarizations at θlab = 0.0°-7.0° for the 208Pb(p,n) reaction at a bombarding energy of Tp = 296 MeV. A multipole decomposition technique was applied to the data to extract the spin-dipole (SD) components from the continuum. The polarization observables were also used, for the first time, to separate the SD components into different spin-parity transfer (ΔJπ = 0-, 1-, and 2-) contributions. The SD strength distributions were clearly dependent on ΔJπ, which is reasonably reproduced by Hartree-Fock (HF) plus random phase approximation (RPA) calculations that include the Skyrme interaction with tensor components [C. L. Bai et al., Phys. Rev. C 83, 054316 (2011)]..
66. Hirokazu Kawamura, T. Aoki, H. Arikawa, S. Ezure, T. Furukawa, K. Harada, A. Hatakeyama, K. Hatanaka, T. Hayamizu, K. Imai, T. Inoue, T. Ishikawa, M. Itoh, T. Kato, T. Murakami, H. S. Nataraj, T. Sato, Y. Shimizu, Tomotsugu Wakasa, H. P. Yoshida, Y. Sakemi, Search for permanent EDM using laser cooled Fr atoms, Hyperfine Interactions, 10.1007/s10751-013-0788-7, 214, 1-3, 133-139, 2013.02, The existence of a non-zero electric dipole moment (EDM) implies the violation of time reversal symmetry. As the time-reversal symmetry violation predicted by the Standard Model (SM) for the electron EDM is too small to be observed with current experimental techniques and any a non-zero EDM would indicate new physics beyond the SM. The tiny signal from the electron EDM is enhanced in the heavy atoms such as francium (Fr). We are constructing the laser-cooled Fr factory to search for the electron EDM..
67. K. Sagara, S. Kuroita, T. Sueta, H. Shimoda, Y. Eguchi, K. Yashima, T. Yabe, M. Dozono, Y. Yamada, T. Wakasa, T. Noro, H. Matsubara, J. Zenihiro, Y. Tameshige, H. Okamura, A. Tamii, K. Hatanaka, T. Saito, Y. Maeda, H. Kamada, Cross Section Enhancement in pd Reactions at Higher Energy, Few-Body Systems, 10.1007/s00601-012-0432-0, 54, 1-4, 469-473, 2013.01, Cross sections of pd breakup reaction at Ep = 250 MeV were measured systematically in single-proton detection and in two-proton coincidence detection. Measured cross section is up to two times higher than calculated ones. The enhancement of breakup cross section is similar to reported enhancement in pd elastic scattering cross section. Origins of this enhancement are discussed..
68. Y. Maeda, T. Saito, H. Miyasako, T. Uesaka, S. Ota, S. Kawase, T. Kikuchi, H. Tokieda, T. Kawabata, K. Yako, T. Wakasa, S. Sakaguchi, R. Chen, H. Sakaguchi, T. Shima, T. Suzuki, A. Tamii, Measurements of the Cross Sections and Ay for D(p, n) Inclusive Breakup Reaction at 170 MeV, Few-Body Systems, 10.1007/s00601-012-0378-2, 54, 1-4, 291-294, 2013.01, The effects of three-nucleon force (3NF) has been actively studied by using the nucleon-deuteron (Nd) scattering states. The differential cross sections of the elastic Nd scattering at the energy below 150 MeV can be well reproduced by incorporating 3NF in the Faddeev calculation based on modern nucleon-nucleon (NN) interactions. On the other hand, the differential cross sections of Nd elastic and inelastic scatterings at 250 MeV show large discrepancies between the data and the Faddeev calculations with 3NF. It indicates the presence of the missing features of the three nucleon system at this energy region. For the systematic study about the energy dependence of this large discrepancies, we measured the differential cross sections and the vector analyzing power Ay for the 2H(p, n) inclusive breakup reaction at 170 MeV. The experiment was carried out at RCNP by detecting scattered neutrons by using the neutron detector NPOL3. The data was compared with the results of the Faddeev calculations with and without the 3NF..
69. S. Almaraz-Calderon, W. P. Tan, A. Aprahamian, M. Beard, G. P.A. Berg, B. Bucher, M. Couder, J. Görres, S. O'Brien, D. Patel, A. Roberts, K. Sault, M. Wiescher, C. R. Brune, T. N. Massey, Kunihiro Fujita, K. Hatanaka, D. Ishiwaka, H. Matsubara, H. Okamura, H. J. Ong, Y. Sakemi, Y. Shimizu, T. Suzuki, Y. Tameshige, A. Tamii, J. Zenihiro, T. Kubo, Y. Namiki, Y. Ohkuma, Y. Shimbara, S. Suzuki, R. Watanabe, R. Yamada, T. Adachi, Y. Fujita, H. Fujita, M. Dozono, T. Wakasa, Level structure of 30S and its importance in the 26Si(α,p)29P and 29P(p,γ)30S reaction rates, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.86.065805, 86, 6, 2012.12, The level structure of 30S was studied via the 28Si(3He,n) and 32S(p,t) reactions at the Nuclear Science Laboratory of the University of Notre Dame and the Research Center for Nuclear Physics of the University of Osaka, Japan. Important experimental information on the energy levels, decay branching ratios, and tentative spin assignments is extracted to calculate the reaction rates for 29P(p,γ)30S and 26Si(α,p)29P, which play a critical role in the reaction flow in explosive hydrogen burning..
70. WAKASA TOMOTSUGU, Complete sets of polarization transfer observables for the 208Pb(p, n) reaction at 296 MeV and Gamow-Teller and spin-dipole strengths for 208Pb, Physical Review C, 85, 064606, 2012.06.
71. M. Sasano, H. Sakai, K. Yako, T. Wakasa, M. Dozono, V. Rodin, A. Faessler, K. Fujita, M.B. Greenfield, K. Hatanaka, K. Itoh, T. Kawabata, H. Kuboki, Y. Maeda, K. Miki, K. Muto, S. Noji, H. Okamura, Y. Sakemi, K. Sekiguchi, Y. Shimizu, Y. Sasamoto, Y. Tameshige, A. Tamii, and T. Uesaka, Gamow-Teller transition strengths in the intermediate nucleus of the 116Cd double-β decay by the 116Cd(p, n)116In and 116Sn(p, n)116In reactions at 300 MeV, Physical Review C, 85, 061301, 85, 061301, 2012.06, The double-differential cross sections for the 116Cd(p,n) and 116Sn(n,p) reactions were measured at 300 MeV for studying the nuclear matrix element of the 116Cd ββ decay. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) component. The integrated GT strengths up to an excitation energy of 30 MeV in the intermediate nucleus 116In are 40 ± 6 and 11 ± 1 in the (p,n) and (n,p) spectra, respectively, including the component from the isovector spin monopole (IVSM). The spectra are compared with those obtained from a theoretical calculation with a quasiparticle random phase approximation, where the contribution from the IVSM component as well as the interference effect between the GT and IVSM components are fully taken into account..
72. T. Wakasa, M. Okamoto, M. Dozono, K. Hatanaka, M. Ichimura, S. Kuroita, Y. Maeda, H. Miyasako, T. Noro, T. Saito, Y. Sakemi, T. Yabe, K. Yako, Complete sets of polarization transfer observables for the 208Pb(p,n) reaction at 296 MeV and Gamow-Teller and spin-dipole strengths for 208Pb, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.85.064606, 85, 6, 2012.06, We report measurements of cross sections and analyzing powers for reaction angles of θlab=0.0-10.0 and complete sets of polarization transfer observables and induced polarizations at θlab=0.0-7.0 for the 208Pb(p,n) reaction at a bombarding energy of Tp=296 MeV. A multipole decomposition technique was applied to the data to extract the Gamow-Teller (GT) and spin-dipole (SD) components from the continuum. The polarization observables were also used, for the first time, to separate the SD components into different spin-parity transfer (ΔJπ=0-, 1-, and 2-) contributions. A significant strength with ΔJπ=1+ is identified in the continuum beyond the GT giant resonance, which is due to configuration mixing effects and the isovector spin monopole (IVSM) contribution. The SD strength distributions were clearly dependent on ΔJπ, which is reasonably reproduced by Hartree-Fock (HF) plus random phase approximation (RPA) calculations that include the Skyrme interaction with tensor components..
73. M. Sasano, H. Sakai, K. Yako, Tomotsugu Wakasa, M. Dozono, V. Rodin, A. Faessler, Kunihiro Fujita, M. B. Greenfield, K. Hatanaka, K. Itoh, T. Kawabata, H. Kuboki, Y. Maeda, K. Miki, K. Muto, S. Noji, H. Okamura, Y. Sakemi, K. Sekiguchi, Y. Shimizu, Y. Sasamoto, Y. Tameshige, A. Tamii, T. Uesaka, Gamow-Teller transition strengths in the intermediate nucleus of the 116Cd double-β decay by the 116Cd(p,n)116In and 116Sn(n,p)116In reactions at 300 MeV, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.85.061301, 85, 6, 2012.06, The double-differential cross sections for the 116Cd(p,n) and 116Sn(n,p) reactions were measured at 300 MeV for studying the nuclear matrix element of the 116Cd ββ decay. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) component. The integrated GT strengths up to an excitation energy of 30 MeV in the intermediate nucleus 116In are 40±6 and 11±1 in the (p,n) and (n,p) spectra, respectively, including the component from the isovector spin monopole (IVSM). The spectra are compared with those obtained from a theoretical calculation with a quasiparticle random phase approximation, where the contribution from the IVSM component as well as the interference effect between the GT and IVSM components are fully taken into account..
74. A.Matic, A.M.van den Berg, M.N.Harakeh, H.J.Wortche, M.Beard, G.P.A.Berg, J.Gorres, P.LeBlanc, S.O'Brien, M.Wiescher, K.Fujita, K.Hatanaka, Y.Sakemi, Y.Shimizu, Y.Tameshige, A.Tamii, M.Yosoi, T.Adachi, Y.Fujita, Y.Shimbara, H.Fujita, T.Wakasa, J.P.Greene, R.Crowter, H.Schatz, High-precision 28Si( p, t)26Si reaction to determine 22Mg(α, p)25Al reaction rates, Physical Review C, 84, 025801, 2011.08.
75. A. Matic, A. M. Van Den Berg, M. N. Harakeh, H. J. Wörtche, M. Beard, G. P.A. Berg, J. Görres, P. Leblanc, S. O'Brien, M. Wiescher, K. Fujita, K. Hatanaka, Y. Sakemi, Y. Shimizu, Y. Tameshige, A. Tamii, M. Yosoi, T. Adachi, Y. Fujita, Y. Shimbara, H. Fujita, T. Wakasa, J. P. Greene, R. Crowter, H. Schatz, High-precision 28Si(p,t)26Si reaction to determine 22Mg(α,p)25Al reaction rates, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.84.025801, 84, 2, 2011.08, The rise time of stellar x-ray bursts is a signature of thermonuclear runaway processes in the atmosphere of neutron stars and is highly sensitive to a series of (α,p) reactions via high-lying resonances in sd-shell nuclei. Lacking data for the relevant resonance levels, the stellar reaction rates have been calculated using statistical, Hauser-Feshbach models, assuming a high-level density. This assumption may not be correct in view of the selectivity of the (α,p) reaction to natural parity states. We measured the 28Si(p,t)26Si reaction with a high-resolution spectrometer to identify resonance levels in 26Si above the α-emission threshold at 9.164 MeV excitation energy. These resonance levels are used to calculate the stellar reaction rate of the 22Mg(α,p)25Al reaction and to test the validity of the statistical assumption..
76. S.Kuroita, K.Sagara, Y.Eguchi, K.Yashima, T.Shishido, T.Yabe, M.Dozono, Y.Yamada, T.Wakasa, T.Noro, H.Matsubara, J.Zenihiro, A.Tamii, H.Okamura, K.Hatanaka, T.Saito, Y.Maeda, H.Kamada, Y.Tameshige, Discrepancy of Cross Sections in pd Breakup Reactions at Ep = 250 MeV, Few-Body Systems, 50, 287, 2011.07.
77. T.Wakasa, M.Okamoto, M.Takaki, M.Dozono, K.Hatanaka, M.Ichimura, T.Noro, H.Okamura, Y.Sakemi, Complete set of polarization transfer observables for the 16O( p, n)16F reaction at 296 MeV and 0 degrees, Physical Review C, 84, 014614, 2011.07.
78. T. Wakasa, M. Okamoto, M. Takaki, M. Dozono, K. Hatanaka, M. Ichimura, T. Noro, H. Okamura, Y. Sakemi, Complete set of polarization transfer observables for the 16O (p-,n)16F reaction at 296 MeV and 0 degrees, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.84.014614, 84, 1, 2011.07, We report measurements of the cross section and a complete set of polarization transfer observables for the 16O(p-,n-)16F reaction at a bombarding energy of Tp = 296 MeV and a reaction angle of θlab = 0. The data are compared with distorted-wave impulse approximation calculations employing the large configuration-space shell-model (SM) wave functions. The well-known Gamow-Teller and spin-dipole (SD) states at excitation energies of Ex 8 MeV have been reasonably reproduced by the calculations except for the spin-parity Jπ = 2- state at E x = 5.86 MeV. The SD resonance at Ex 9.5 MeV appears to have more Jπ = 2- strength than Jπ = 1- strength, consistent with the calculations. The data show significant strength in the spin-longitudinal polarized cross section IDL(0) at Ex 15 MeV, which indicates the existence of the Jπ = 0- SD resonance as predicted in the SM calculations..
79. K.Sekiguchi, H.Okamura, N.Sakamoto, H.Suzuki, M.Dozono, Y.Maeda, T.Saito, S.Sakaguchi, H.Sakai, M.Sasano, Y.Shimizu, T.Wakasa, K.Yako, H.Witala, W.Glockle, J.Golak, H.Kamada, A.Nogga, Three nucleon force effects in intermediate-energy deuteron analyzing powers for dp elastic scattering, Physical Review C, 83, 061001, 2011.06.
80. K. Sekiguchi, H. Okamura, N. Sakamoto, H. Suzuki, M. Dozono, Y. Maeda, T. Saito, S. Sakaguchi, H. Sakai, M. Sasano, Y. Shimizu, T. Wakasa, K. Yako, H. Witała, W. Glöckle, J. Golak, H. Kamada, A. Nogga, Three nucleon force effects in intermediate-energy deuteron analyzing powers for dp elastic scattering, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.83.061001, 83, 6, 2011.06, A complete high precision set of deuteron analyzing powers for elastic deuteron-proton (dp) scattering at 250 MeV/nucleon (MeV/N) has been measured. The new data are presented together with data from previous measurements at 70, 100, 135 and 200 MeV/N. They are compared with the results of three-nucleon (3N) Faddeev calculations based on modern nucleon-nucleon (NN) potentials alone or combined with two models of three nucleon forces (3NFs): the Tucson-Melbourne 99 (TM99) and Urbana IX. At 250 MeV/N large discrepancies between pure NN models and data, which are not resolved by including 3NFs, were found at c.m. backward angles of θc.m.120° for almost all the deuteron analyzing powers. These discrepancies are quite similar to those found for the cross section at the same energy. We found small relativistic effects that cannot resolve the discrepancies with the data indicating that other, short-ranged 3NFs are required to obtain a proper description of the data..
81. S. Kuroita, K. Sagara, Y. Eguchi, K. Yashima, T. Shishido, T. Yabe, M. Dozono, Y. Yamada, T. Wakasa, T. Noro, H. Matsubara, J. Zenihiro, A. Tamii, H. Okamura, K. Hatanaka, T. Saito, Y. Maeda, H. Kamada, Y. Tameshige, Discrepancy of Cross Sections in pd Breakup Reactions at Ep = 250 MeV, Few-Body Systems, 10.1007/s00601-011-0219-8, 50, 1-4, 287-289, 2011.05, In our previous inclusive experiment on 2H(p, p)pn at 247 MeV, the measured cross section at forward angles is about twice larger than 3N calculation with ππ 3NF. Therefore, we have made an exclusive experiment on 2H(p, p1 p2)n at the same energy. The preliminary data suggest that the cross section was enhanced at forward angle of θ1 and θ2..
82. K. Sekiguchi, H. Okamura, N. Sakamoto, H. Suzuki, M. Dozono, Y. Maeda, T. Saito, Satoshi Sakaguchi, H. Sakai, M. Sasano, Y. Shimizu, Tomotsugu Wakasa, K. Yako, Complete set of deuteron analyzing powers for deuteron-proton elastic scattering at 250 MeV/nucleon and three-nucleon forces, International Nuclear Physics Conference 2010, INPC2010 Journal of Physics: Conference Series, 10.1088/1742-6596/312/8/082038, 312, SECTION 8, 2011.01, Measurements of a complete set of deuteron analyzing powers (iT
11
, T
20
, T
21
, and T
22
) for elastic deuteron-proton scattering at 250 MeV/nucleon have been performed with polarized deuteron beams at RIKEN RI Beam Factory. The obtained data are compared with Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson- Melbourne'99 and UrbanaIX three-nucleon forces..
83. Y. Sakemi, K. Harada, T. Hayamizu, M. Itoh, H. Kawamura, S. Liu, H. S. Nataraj, A. Oikawa, M. Saito, T. Sato, H. P. Yoshida, T. Aoki, A. Hatakeyama, T. Murakami, K. Imai, K. Hatanaka, T. Wakasa, Y. Shimizu, M. Uchida, Search for a permanent EDM using laser cooled radioactive atom, Journal of Physics: Conference Series, 10.1088/1742-6596/302/1/012051, 302, 1, 2011.01, An Electric Dipole Moment (EDM) of the elementary particle is a good prove to observe the phenomena beyond the Standard Model. A non-zero EDM shows the violation of the time reversal symmetry, and under the CPT invariance it means the CP violation. In paramagnetic atoms, an electron EDM results in an atomic EDM enhanced by the factor of the 3rd power of the charge of the nucleus due the relativistic effects. A heaviest alkali element francium (Fr), which is the radioactive atom, has the largest enhancement factor K ∼ 895. Then, we are developing a high intensity laser cooled Fr factory at Cyclotron and Radioisotope Center (CYRIC), Tohoku University to perform the search for the EDM of Fr with the accuracy of 10-29 e·cm. The important points to overcome the current accuracy limit of the EDM are to realize the high intensity Fr source and to reduce the systematic error due to the motional magnetic field and inhomogeneous applied field. To reduce the dominant component of the systematic errors mentioned above, we will confine the Fr atoms in the small region with the Magneto-Optical Trap and optical lattice using the laser cooling and trapping techniques. The construction of the experimental apparatus is making progress, and the new thermal ionizer already produces the Fr of ∼106 ions/s with the primary beam intensity 200 nA. The developments of the laser system and optical equipments are in progress, and the present status and future plan of the experimental project is reported..
84. Masanori Dozono, Tomotsugu Wakasa, Midori Okamoto, Motonobu Takaki, Kichiji Hatanaka, Yasuhiro Sakemi, Study of spin-dipole strengths in 16F via complete polarization transfer measurements, Journal of Physics: Conference Series, 10.1088/1742-6596/295/1/012122, 295, 1, 2011.01, A complete set of polarization transfer observables has been measured for the 16O(p, n) reaction at Tp = 296 MeV and θlab = 0°. The measured polarization transfer observables are used in order to investigate the spin-parity of the spin-dipole resonance in 16F. A possible indication of 0- state has been found at Ex = 11.0 MeV. The obtained results also show the energy hierarchy Ex(2-) < Ex(0-) < E x(l-), which suggests the importance of the tensor correlations..
85. Tatsuya Fujinaka, Yujiro Yonemura, Hidehiko Arima, Kunihiro Fujita, Tadahiko Hasuo, Nobuo Ikeda, Kenji Ishibashi, Tadashi Korenaga, Keisuke Maehata, Takashi Matsunaga, Shunsuke Mochizuki, Tsuneyasu Morikawa, Tetsuo Noro, Nobuhiro Shigyo, Hidenobu Takase, Yusuke Uozumi, Genichiro Wakabayashi, Tomotsugu Wakasa, Hisayoshi Nakayama, Akira Takagi, Takio Tomimasu, Yoshiharu Mori, Commissioning of FFAG accelerator at Kyushu university, 1st International Particle Accelerator Conference, IPAC 2010 IPAC 2010 - 1st International Particle Accelerator Conference, 543-545, 2010.12, 150 MeV FFAG accelerator is under construction at Center for Accelerator and Beam Applied Science on Ito Campus to promote activities in all related scientific, medical, engineering and educational field at Kyushu University. In this paper, status of the development of hardwares and the results of the beam commissioning of the injector are described..
86. G. P.A. Berg, Y. Fujita, T. Adachi, A. M. Van Den Berg, H. Fujita, K. Fujita, J. Görres, M. N. Harakeh, K. Hatanaka, A. Matic, S. O'Brien, Y. Sakemi, Y. Shimbara, Y. Shimizu, R. Talwar, Y. Tameshige, A. Tamii, T. Wakasa, M. Wiescher, M. Yosoi, High-precision (p,t) reactions to determine reaction rates in the stellar rp-process, 10th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG10 10th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG10, 10.1063/1.3485201, 460-462, 2010.09, The main source of uncertainties in stellar rate calculations of the rp-process and the competing α p-process is often the lack of knowledge of the resonance states above the p- and α- thresholds and their precise energies. We have started a program to study these resonances in protonrich unstable nuclei via the (p; t) and other neutron-pickup reactions using the high resolution spectrometer Grand Raiden. Here, we are presenting the status of the project and recent results of the 25Al(p;γ) reaction rates based on the analysis of measured 28Si(p,t)26Si spectra..
87. A. Matic, A.M. van den Berg, M.N. Harakeh, H.J. W\"ortche, G.P.A. Berg, M. Couder, J. G\"orres, P. LeBlanc, S. O'Brien, M. Wiescher, K. Fujita, K. Hatanaka, Y. Sakemi, Y. Shimizu, Y. Tameshige, A. Tamii, M. Yosoi, T. Adachi, Y. Fujita, Y. Shimbara, H. Fujita, T. Wakasa, B.A. Brown, and H. Schatz, High-precision ($p$,$t$) reaction to determine $^{25}{\rm Al}$($p,\gamma{}$)$^{26}{\rm Si}$ reaction rates, Physical Review C, 82, 025807, 2010.08.
88. A. Matic, A. M. Van Den Berg, M. N. Harakeh, H. J. Wörtche, G. P.A. Berg, M. Couder, J. Görres, P. Leblanc, S. O'Brien, M. Wiescher, K. Fujita, K. Hatanaka, Y. Sakemi, Y. Shimizu, Y. Tameshige, A. Tamii, M. Yosoi, T. Adachi, Y. Fujita, Y. Shimbara, H. Fujita, T. Wakasa, B. A. Brown, H. Schatz, High-precision (p,t) reaction to determine Al25(p,γ)Si26 reaction rates, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.82.025807, 82, 2, 2010.08, Since the identification of ongoing Al26 production in the universe, the reaction sequence Mg24(p,γ)Al25(β+ν)Mg25(p,γ)Al26 has been studied intensively. At temperatures where the radiative capture on Al25 (t1/2=7.2 s) becomes faster than the β+ decay, the production of Al26 can be reduced due to the depletion of Al25. To determine the resonances relevant for the Al25(p,γ)Si26 bypass reaction, we measured the Si28(p,t)Si26 reaction with high-energy precision using the Grand Raiden spectrometer at the Research Center for Nuclear Physics, Osaka. Several new energy levels were found above the p threshold and for known states excitation energies were determined with smaller uncertainties. The calculated stellar rates of the bypass reaction agree well with previous results, suggesting that these rates are well established..
89. Y. Shimbara, Y. Fujita, T. Adachi, G. P.A. Berg, B. A. Brown, H. Fujimura, H. Fujita, K. Fujita, K. Hara, K. Y. Hara, K. Hatanaka, J. Kamiya, K. Katori, T. Kawabata, K. Nakanishi, N. Sakamoto, Y. Sakemi, Y. Shimizu, T. Tameshige, M. Uchida, T. Wakasa, M. Yoshifuku, M. Yosoi, R. G.T. Zegers, Isospin symmetry of Tz = ±3/2 → ±1/2 gamow-teller transitions in A = 37 and A = 41 nuclei, Modern Physics Letters A, 10.1142/S0217732310000782, 25, 21-23, 1976-1979, 2010.07, Under the assumption of good isospin symmetry, Tz = ±3/2 → ±1/2 Gamow-Teller (GT) transitions in a mass A isobar are analogous, where Tz is the z component of isospin T defined by 1/2(N - Z). We studied the Tz = +3/2 → +1/2 GT transitions by using the 37Cl(3He,t)37Ar and 41K( 3He,t)41Ca reactions at Ebeam = 140 MeV/nucleon. The GT transition strengths in 37Ar and 41Ca were obtained up to the excitation energy (Ex) of 14.2 MeV and 10.4 MeV with energy resolutions of 30 and 35 keV, respectively. The obtained GT strengths were compared with those of the Tz = -2/3 → -1/2 mirror transitions, measured by the β-decay of 37Ca and 41Ti, respectively. It was found that the overall distributions of the mirror transitions were similar in both A = 37 and A = 41 systems. In A = 37 the differences seen at lower excitation energies are suggested to be the effect of the tensor interaction in the charge-exchange reaction. The differences seen at higher excitation energies are suggested to be the effect of the Coulomb interaction that can break the mirror symmetry of the strength distributions..
90. Y. Yasuda, H. Sakaguchi, S. Asaji, K. Fujita, Y. Hagihara,K. Hatanaka, T. Ishida, M. Itoh, T. Kawabata, S. Kishi, T. Noro, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tameshige, S. Terashima, M. Uchida, T. Wakasa, T. Yonemura, H.P. Yoshida, M. Yosoi, and J. Zenihiro, Spectroscopic factors and strength distributions for the deeply bound orbitals in ${}^{40}{\rm Ca}$ obtained from the $(\vec{p},2p)$ reaction at 392 MeV, Physical Review C, 81, 044315, 2010.04.
91. K. Sekiguchi, N. Sakamoto, M. Sasano, S. Sakaguchi, H. Okamura, H. Suzuki, H. Sakai, K. Yako, Y. Shimizu, Y. Maeda, T. Saito, T. Wakasa, M. Dozono, Complete set of deuteron analyzing powers for dp elastic scattering at 250 MeV/nucleon and three nucleon forces, 19th International IUPAP Conference on Few-Body Problems in Physics, Few-Body 2009 EPJ Web of Conferences, 10.1051/epjconf/20100305024, 3, 2010.04, Measurements of a complete set of deuteron analyzing powers (iT11, T20, T21, T22) for elastic deuteron-proton scattering at 250 MeV/nucleon have been performed with polarized deuteron beams at RIKEN RI Beam Factory. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne'99, and UrbanaIX three nucleon forces..
92. S. Kuroita, K. Sagara, Y. Eguchi, K. Yashima, T. Yabe, T. Shishido, M. Dozono, Y. Yamada, T. Wakasa, T. Noro, H. Matsubara, J. Zenihiro, A. Tamii, H. Okamura, K. Hatanaka, T. Saito, Y. Maeda, H. Kamada, Y. Tameshige, Measurement of 2H (p, pp)n cross sections at Ep = 250 MeV, 19th International IUPAP Conference on Few-Body Problems in Physics, Few-Body 2009 EPJ Web of Conferences, 10.1051/epjconf/20100305022, 3, 2010.04, In our previous inclusive experiment on pd breakup at Ep = 247 MeV, we found experimental cross section is about twice larger than 3N calculation with ππ3NF at forward angle. Therefore we made exclusive measurement of 2H(p, p1 p2)n cross section at the same 247 MeV. Preliminary data indicate that the cross section enhancement appears at forward angles of θ1 and θ2. We made also inclusive experiment again and confirmed the previous data..
93. Y. Yasuda, H. Sakaguchi, S. Asaji, K. Fujita, Y. Hagihara, K. Hatanaka, T. Ishida, M. Itoh, T. Kawabata, S. Kishi, T. Noro, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tameshige, S. Terashima, M. Uchida, T. Wakasa, T. Yonemura, H. P. Yoshida, M. Yosoi, J. Zenihiro, Spectroscopic factors and strength distributions for the deeply bound orbitals in Ca40 obtained from the (p□,2p) reaction at 392MeV, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.81.044315, 81, 4, 2010.04, The cross sections and analyzing powers for the Ca40(p□,2p) reaction were measured. The strength distributions for the deep-hole states were obtained by a multipole decomposition analysis. The centroid energies and widths of the hole-state strengths of the 1p and 1s1/2 orbitals in Ca40 were determined. The spectroscopic factors for the deeply bound 1p and 1s1/2 orbitals were extracted as 49±10% and 78±14% of the sum-rule limits of the independent-particle shell model, respectively. A strong influence of the nucleon-nucleon correlations on the spectroscopic factors is suggested..
94. H. Okamura, K. Hatanaka, T. Ikeda, K. Itoh, H. Kumasaka, Y. Maeda, T. Saito, H. Sakai, K. Sekiguchi, K. Suda, R. Suzuki, T. Uesaka, T. Wakasa, K. Yako, Study of breakup mechanism of a loosely bound projectile in a region of Coulomb-breakup dominance, 19th International IUPAP Conference on Few-Body Problems in Physics, Few-Body 2009 EPJ Web of Conferences, 10.1051/epjconf/20100306010, 3, 2010.04, A kinematically complete measurement of the deuteron elastic break reaction has been carried out at Ed = 140 MeV on 12C, 40Ca, 90Zr, and 208Pb targets in a wide angular range of θp, θn = 0° -8° for a detailed study of the reaction mechanism of loosely bound projectiles in kinematical regions of Coulomb-breakup dominance. A finite-range calculation of the post-form distorted-wave Born approximation is presented..
95. M. Sasano, H. Sakai, K. Yako, K. Miki, S. Noji, Tomotsugu Wakasa, M. Dozono, Kunihiro Fujita, M. B. Greenfield, K. Hatanaka, T. Kawabata, H. Kuboki, Y. Maeda, H. Okamura, Y. Sakemi, K. Sekiguchi, Y. Shimizu, Y. Tameshige, A. Tamii, T. Uesaka, Y. Sasamoto, K. Itoh, K. Muto, Measurements of the 116Cd(p,n) and 116Sn(n,p) reactions at 300 MeV for studying Gamow-Teller transition strengths in the intermediate nucleus of the 116Cd double-β decay, Workshop on Calculation of Double-Beta-Decay Matrix Elements, MEDEX '09 Workshop on Calculation of Double-Beta-Decay Matrix Elements (MEDEX '09), 10.1063/1.3266084, 102-106, 2009.12, The double differential cross sections for the 116Cd(p,n) and 116Sn(n,p) reactions at 300 MeV have been measured over a wide excitation-energy region including Gamow-Teller (GT) giant resonance (GTGR) for studying GT transition strengths in the intermediate nucleus of the 116Cd double-β decay, namely 116In. A large amount of the strengths in the β+ direction has been newly found in the energy region up to 30 MeV, which may imply that the GT strengths in the GTGR region contribute to the nuclear matrix element of the two-neutrino double-β decay..
96. A. Matic, A.M.van den Berg, M.N. Harakeh, H.J. Wortche, G.P.A. Berg, M. Couder, J.L. Fisker, J. Gorres, P. LeBlanc, S. O'Brien, M. Wiescher, K. Fujita, K. Hatanaka, Y. Sakemi, Y. Shimizu, Y. Tameshige, A. Tamii, M. Yosoi, T. Adachi, Y. Fujita, Y. Shimbara, H. Fujita, T. Wakasa, P.O. Hess, B.A. Brown, and H. Schatz , High-precision (p,t) reaction measurement to determine 18Ne(alpha,p)21Na reaction rates
, Physical Review C, 80, 055804, Phys.Rev. C 80, 055804 (2009)

, 2009.11.
97. A. Matic, A. M. Van Der Berg, M. N. Harakeh, H. J. Wörtche, G. P.A. Berg, M. Couder, J. L. Fisker, J. Görres, P. Leblanc, S. O'Brien, M. Wiescher, K. Fujita, K. Hatanaka, Y. Sakemi, Y. Shimizu, Y. Tameshige, A. Tamii, M. Yosoi, T. Adachi, Y. Fujita, Y. Shimbara, H. Fujita, T. Wakasa, P. O. Hess, B. A. Brown, H. Schatz, High-precision (p,t) reaction measurement to determine Ne18(α,p)Na21 reaction rates, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.80.055804, 80, 5, 2009.11, x-ray bursts are identified as thermonuclear explosions in the outer atmosphere of accreting neutron stars. The thermonuclear runaway is fueled by the αp process that describes a sequence of (α,p) reactions triggered by the Ne18(α,p)Na21 breakout reaction from the hot CNO cycles. We studied the level structure of the compound nucleus Mg22 by measuring the Mg24(p,t)Mg22 reaction at the Grand Raiden spectrometer at Research Center for Nuclear Physics, Osaka. A large number of α-unbound states was identified and precise excitation energies were determined. Based on shell model and α-cluster model calculations we predict the level parameters for determining the stellar reaction rate of Ne18(α,p)Na21 for a wide temperature range. x-ray burst simulations have been performed to study the impact of the reaction on the x-ray burst luminosity..
98. Kunihiro Fujita, Y. Sakemi, M. Dozono, K. Hatanaka, M. Nomachi, T. Sawada, Tomotsugu Wakasa, Development of GEM tracking detector for intermediate-energy nuclear experiments, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2009.06.051, 608, 1, 48-54, 2009.09, We have developed a tracking detector with a gas electron multiplier (GEM) for nuclear experiments. The developed GEM detector was installed inside the dipole magnet used for transporting the primary beam to the beam dump and it was used to measure the momentum of charged particles. A sufficiently high spatial resolution was achieved at a high counting rate and a magnetic field for coherent pion production with a 392 MeV proton beam to study the short-range component of the residual nuclear interaction. The detector systems and development procedure are described..
99. M. Dozono,T. Wakasa, E. Ihara, S. Asaji, K. Fujita, K. Hatanaka, M. Ichimura, T. Ishida, T. Kaneda, H. Matsubara, Y. Nagasue, T. Noro, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tameshige, A. Tamii, and Y. Yamada , Polarization transfer measurements for 12C(p,n)12N(g.s.,1+) at 296 MeV and nuclear correlation effects
, Physical Review C, 80, 024319, Phys.Rev. C 80, 024319 (2009)

, 2009.08.
100. K. Yako, M. Sasano, K. Miki, H. Sakai, M. Dozono, D. Frekers, M. B. Greenfield, K. Hatanaka, E. Ihara, M. Kato, T. Kawabata, H. Kuboki, Y. Maeda, H. Matsubara, K. Muto, S. Noji, H. Okamura, T. H. Okabe, Satoshi Sakaguchi, Y. Sakemi, Y. Sasamoto, K. Sekiguchi, Y. Shimizu, K. Suda, Y. Tameshige, A. Tamii, T. Uesaka, Tomotsugu Wakasa, H. Zheng, Gamow-teller strength distributions in Sc48 by the Ca48(p,n) and Ti48(n,p) reactions and two-neutrino double-β decay nuclear matrix elements, Physical Review Letters, 10.1103/PhysRevLett.103.012503, 103, 1, 2009.08, The double-differential cross sections for the Ca48(p,n) and Ti48(n,p) reactions were measured at 300MeV. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) components. The integrated GT strengths up to an excitation energy of 30MeV in Sc48 are 15.3±2.2 and 2.8±0.3 in the (p,n) and (n,p) spectra, respectively. In the (n,p) spectra additional GT strengths were found above 8MeV where shell models within the fp shell-model space predict almost no GT strengths, suggesting that the present shell-model description of the nuclear matrix element of the two-neutrino double-β decay is incomplete..
101. Tomotsugu Wakasa, Nuclear spin physics via polarization measurements, 18th International Spin Physics Symposium 2008 Spin Physics 18th International Spin Physics Symposium, 10.1063/1.3215628, 1149, 190-199, 2009.08, The pion is the most important ingredient for nuclear forces, and it leads to various phenomena such as the three nucleon forces, tensor correlations, and pion condensation. These very interesting phenomena have been extensively investigated by accumulating high-precision experimental data on various observables. Three topics are discussed by comparing these data with recent sophisticated calculations; three nucleon force effects in few nucleon systems, short-range and tensor correlations on spin and isospin responses, and pionic correlations at large momentum transfers..
102. M. Dozono, T. Wakasa, E. Ihara, S. Asaji, K. Fujita, K. Hatanaka, M. Ichimura, T. Ishida, T. Kaneda, H. Matsubara, Y. Nagasue, T. Noro, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tameshige, A. Tamii, Y. Yamada, Polarization transfer measurements for C12(p→,n→)N12(g.s.,1+) at 296 MeV and nuclear correlation effects, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.80.024319, 80, 2, 2009.08, Differential cross sections and complete sets of polarization observables are presented for the Gamow-Teller C12(p→,n→)N12(g.s.,1+) reaction at a bombarding energy of 296 MeV with momentum transfers q of 0.1 to 2.2 fm-1. The polarization transfer observables are used to deduce the spin-longitudinal cross section, IDq, and spin-transverse cross sections, IDp and IDn. The data are compared with calculations based on the distorted-wave impulse approximation (DWIA) using shell-model wave functions. Significant differences between the experimental and theoretical results are observed for all three spin-dependent IDi at momentum transfers of q O. 5 -1, suggesting the existence of nuclear correlations beyond the shell model. We also performed DWIA calculations employing random-phase approximation (RPA) response functions and found that the observed discrepancy is partly resolved by the pionic and -mesonic correlation effects..
103. M. Dozono, T. Wakasa, E. Ihara, S. Asaji, K. Fujita, K. Hatanaka, T. Ishida, T. Kaneda, H. Matsubara, Y. Nagasue, T. Noro, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tameshige, A. Tamii, Y. Yamada, Study of12C(p→, N→)12N(g.s.; 1+) at 296 MeV and nuclear correlation effects, 18th International Spin Physics Symposium 2008 Spin Physics 18th International Spin Physics Symposium, 10.1063/1.3215739, 695-698, 2009.08, We present measurements of the cross section and a complete set of polarization observables for the Gamow-Teller12C(p→, n→)12N(g.s.; 1+) reaction at an incident proton energy of 296 MeV. The complete set of polarization observables is used to separate the cross section into spin-longitudinal and spin-transverse components. From the comparison with the distorted wave impulse approximation calculations employing random phase approximation response functions, we found that our data showed the existence of the pionic and rho-mesonic correlations in nuclei..
104. K. Yako, M. Sasano, K. Miki, H. Sakai, M. Dozono, D. Frekers, M.B. Greenfield, K. Hatanaka, E. Ihara, M. Kato, T. Kawabata, H. Kuboki, Y. Maeda, H. Matsubara, K. Muto, S. Noji, H. Okamura, T.H. Okabe, S. Sakaguchi, Y. Sakemi, Y. Sasamoto, K. Sekiguchi, Y. Shimizu, K. Suda, Y. Tameshige, A. Tamii, T. Uesaka, T. Wakasa, and H. Zheng , Gamow-Teller Strength Distributions in 48Sc by the 48Ca(p,n) and 48Ti(n,p) Reactions and Two-Neutrino Double-beta Decay Nuclear Matrix Elements
, Physical Review Letters, 103, 012503, Phys.Rev. Lett 103, 012503 (2009)

, 2009.07.
105. T.Wakasa, E.Ihara, M.Dozono, K.Hatanaka, T.Imamura, M.Kato, S.Kuroita, H.Matsubara, T.Noro, H.Okamura, K.Sagara, Y.Sakemi, K.Sekiguchi, K.Suda, T.Sueta, Y.Tameshige, A.Tamii, H.Tanabe, Y.Yamada , Complete set of polarization transfer coefficients for the 3He(p, n) reaction at 346 MeV and 0 degrees


, Physical Review C, Phys.Rev. C 77, 054611 (2008)

, 2009.05.
106. K. Sekiguchi, H. Sakai, H. Witala, W. Glockle, J. Golak, K. Itoh, H. Kamada, T. Kawabata, H. Kuboki, Y. Maeda, A. Nogga, H. Okamura, S. Sakaguchi, N. Sakamoto, Y. Sasamoto, M. Sasano, R. Skibinski, K. Suda, Y. Takahashi, T. Uesaka, T. Wakasa, and K. Yako , Three-nucleon force effects in the 1H(d,pp)n reaction at 135 MeV/nucleon
, Physical Review C, 79, 054008, Phys.Rev. C 79, 054008 (2009)

, 2009.05.
107. K. Sekiguchi, H. Sakai, H. Witała, W. Glöckle, J. Golak, K. Itoh, H. Kamada, T. Kawabata, H. Kuboki, Y. Maeda, A. Nogga, H. Okamura, S. Sakaguchi, N. Sakamoto, Y. Sasamoto, M. Sasano, R. Skibiński, K. Suda, Y. Takahashi, T. Uesaka, T. Wakasa, K. Yako, Three-nucleon force effects in the H1(d→,p→p)n reaction at 135 MeV/nucleon, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.79.054008, 79, 5, 2009.05, The deuteron to proton polarization transfer coefficients Kyyy' and Kyy' together with the deuteron analyzing powers are measured in three coplanar configurations of the deuteron-proton breakup reaction with a 135-MeV/nucleon polarized deuteron beam at the RIKEN Accelerator Research Facility. The data are compared with theoretical predictions based on exact solutions of the three-nucleon (3N) Faddeev equations with high-precision nucleon-nucleon (NN) forces, alone or combined with two 3N force (3NF) models, the 2π-exchange Tucson-Melbourne'(99) (TM'99) and Urbana IX. Large 3NF effects have been found for all the measured observables. Predicted effects are supported by the data, with the exception of the vector analyzing power Ayd. For this observable, theory based on only NN forces is sufficient to explain the data. The behavior of the breakup analyzing powers is found to be different from the corresponding observables in elastic nucleon-deuteron scattering..
108. K. Fujita, Y. Sakemi, M. Dozono, K. Hatanaka, M. Nomachi, T. Sawada, and T. Wakasa , Development of GEM tracking detector for intermediate-energy nuclear experiments
, Nucl. Instrum. Methods Phys. Res. A, 608, 48, Nucl. Instrum. Methods Phys. Res. A 608, 48 (2009).

, 2009.04.
109. S. O'Brien, T. Adachi, G. P.A. Berg, M. Couder, M. Dozono, H. Fujita, Y. Fujita, J. Görres, K. Hatanaka, D. Ishikawa, T. Kubo, H. Matsubara, Y. Namiki, Y. Ohkuma, H. Okamura, H. J. Ong, D. Patel, Y. Sakemis, K. Sault, Y. Shimbara, S. Suzuki, T. Suzuki, A. Tamii, T. Wakasa, R. Wantanabe, M. Wiescher, R. Yamada, J. Zenihiro, Exploring the αp-process with Grand Raiden, 13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics AIP Conference Proceedings, 10.1063/1.3087029, 1090, 288-292, 2009.04, 22Mg, 30S, 34Ar and 38Ca have been investigated using (p,t) reactions at RCNP with the intent of identifying energy levels in nuclei that determine the reaction rates along the pathway of the αp-process. These experiments exploit the high resolution and 0° capabilities of the Grand Raiden spectrometer and the WS beamline, which can deliver a fully dispersion matched beam to target. The level information is vital to understanding the nucleosynthesis occurring during explosive hydrogen burning, which, for example, is thought to occur during type I X-ray bursts. In the case of 22Mg, new reaction rate calculations have been performed for the 18Ne(α,p)21Na reaction. The experimental technique will be discussed, and the experimental results will be presented..
110. Kenshi Sagara, Y. Tameshige, K. Hatanaka, S. Kuroita, H. Matsubara, Kunihiro Fujita, Y. Shimizu, T. Kawabata, Y. Maeda, Y. Sakemi, H. Okamura, K. Sekiguchi, A. Tamii, Tomotsugu Wakasa, Measurement and re-analysis of tensor analyzing power of pd radiative capture at RCNP, Modern Physics Letters A, 24, 11-13, 831-834, 2009.04, We made again an experiment of pd radiative capture at Ed→ = 197 MeV, and obtained Axx, Ayy and Azz (= -Axx - Ayy) data using a newly-developed data-analysis method of high detection efficiency. Re-analysis of previous data on A xx and Ayy was also made using a new method. All the new and previous data at 197 MeV agree to each other, and Axx anomaly has been confirmed..
111. Sho Kuroita, K. Sagara, T. Sueta, H. Shimoda, Y. Eguchi, K. Yashima, Y. Maeda, Y. Yamada, T. Wakasa, T. Noro, Y. Tameshige, A. Tamii, K. Hatanaka, Study for three-nucleon force by pd breakup reactions, Modern Physics Letters A, 24, 11-13, 823-826, 2009.04, Cross section and analyzing power Ay of 2H p,p)pn reaction at Ep→ = 247 MeV were measured and large disagreements with 3N calculations were found especially at forward angles. Effects of 2π3NF are too small to explain the discrepancy. To microscopically investigate the discrepancy, a 2H(p,pp)n experiment is planned..
112. H.Fujita, G.P.A.Berg, Y.Fujita, J.Rapaport, T.Adachi, N.T.Botha, H.Fujimura, K.Fujita, K.Hara, K.Hatanaka, J.Kamiya, T.Kawabata, K.Nakanishi, R.Neveling, N.Sakamoto, Y.Sakemi, Y.Shimbara, Y.Shimizu, F.D.Smit, M.Uchida, T.Wakasa, M.Yoshifuku, M.Yosoi, R.G.T.Zegers , High resolution study of isovector negative parity states in the 16O(3He, t)16F reaction at 140 MeV/nucleon, Physical Review C, Phys.Rev. C 79, 024314 (2009)
, 2009.02.
113. M.Sasano, H.Sakai, K.Yako, T.Wakasa, S.Asaji, K.Fujita, Y.Fujita, M.B.Greenfield, Y.Hagihara, K.Hatanaka, T.Kawabata, H.Kuboki, Y.Maeda, H.Okamura, T.Saito, Y.Sakemi, K.Sekiguchi, Y.Shimizu, Y.Takahashi, Y.Tameshige, A.Tamii , Gamow-Teller unit cross sections of the (p, n) reaction at 198 and 297 MeV on medium-heavy nuclei


, Physical Review C, Phys.Rev. C 79, 024602 (2009)

, 2009.02.
114. H. Fujita, G.P.A. Berg, Y. Fujita, J. Rapaport, T. Adachi, N.T. Botha, H. Fujimura, K. Fujita, K. Hara, K. Hatanaka,J. Kamiya, T. Kawabata, K. Nakanishi, R. Neveling, N. Sakamoto, Y. Sakemi, Y. Shimbara, Y. Shimizu, F.D. Smit, M. Uchida, T. Wakasa, M. Yoshifuku, M. Yosoi, and R.G.T. Zegers , High resolution study of isovector negative parity states in the 16O(3He,t)16F reaction at 140 MeV/nucleon
, Physical Review C, 79, 024314, Phys.Rev. C 79, 024314 (2009)

, 2009.02.
115. M. Sasano, H. Sakai, K. Yako, T. Wakasa, S. Asaji, K. Fujita, Y. Fujita, M.B. Greenfield, Y. Hagihara, K. Hatanaka, T. Kawabata, H. Kuboki, Y. Maeda, H. Okamura, T. Saito, Y. Sakemi, K. Sekiguchi, Y. Shimizu, Y. Takahashi, Y. Tameshige, and A. Tamii , Gamow-Teller unit cross sections of the (p,n) reaction at 198 and 297 MeV on medium-heavy nuclei
, Physical Review C, 79, 024602, Phys.Rev. C 79, 024602 (2009)

, 2009.02.
116. M. Sasano, H. Sakai, K. Yako, Tomotsugu Wakasa, S. Asaji, Kunihiro Fujita, Y. Fujita, M. B. Greenfield, Y. Hagihara, K. Hatanaka, T. Kawabata, H. Kuboki, Y. Maeda, H. Okamura, T. Saito, Y. Sakemi, K. Sekiguchi, Y. Shimizu, Y. Takahashi, Y. Tameshige, A. Tamii, Gamow-Teller unit cross sections of the (p,n) reaction at 198 and 297 MeV on medium-heavy nuclei, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.79.024602, 79, 2, 2009.02, Gamow-Teller (GT) unit cross sections, σGT, are obtained at 198 and 297 MeV by measuring the double differential cross sections at 0° for the (p,n) reaction on Ni58, Zn70, Cd114, Sn118, and Sn120. The mass dependence of σGT and the ratio of σGT to the Fermi unit cross section, σF, (R2) are also derived in the mass region of 58≤A≤120. The σGT value for Zr90 at 297 MeV interpolated using the A-dependence obtained herein agrees with that used in a previous analysis where the GT transition strength over a wide energy region up to the continuum was discussed. However, the deduced Ni64σGT value at 198 MeV is 20% smaller than that obtained from the analysis of a previous (n,p) measurement. The present R2 values in the mass region heavier than Ca42 are larger than those in the region up to Ca42 and increase as a function of A..
117. H. Fujita, G. P.A. Berg, Y. Fujita, J. Rapaport, T. Adachi, N. T. Botha, H. Fujimura, K. Fujita, K. Hara, K. Hatanaka, J. Kamiya, T. Kawabata, K. Nakanishi, R. Neveling, N. Sakamoto, Y. Sakemi, Y. Shimbara, Y. Shimizu, F. D. Smit, M. Uchida, T. Wakasa, M. Yoshifuku, M. Yosoi, R. G.T. Zegers, High resolution study of isovector negative parity states in the O16(He3,t)F16 reaction at 140 MeV/nucleon, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.79.024314, 79, 2, 2009.02, The isovector transitions from the ground state (g.s.) of O16 to the negative parity states in F16, i.e., the Jπ=0- g.s., the 0.193 MeV, 1- state, the 0.424 MeV, 2- state, the 0.721 MeV, 3- state, and the 4- "stretched" state at 6.372 MeV, were studied by using a high resolution O16(He3,t)F16 reaction at 140 MeV/nucleon. With the help of high energy resolution, these states were, for the first time, clearly resolved in a charge exchange reaction at an intermediate energy, which favorably excites spin-flip states. Angular distributions of the reaction cross sections were measured in the laboratory frame from 0° to 14°. Parameters of phenomenological effective interactions were derived so as to reproduce these angular distributions in distorted wave Born approximation (DWBA) calculations. The angular distribution of the 0- state could be reproduced well at θc.m.<10°. The empirical values, however, are larger by a factor of 2-2.5 in the larger angle region, where the contribution of the so-called "condensed pion field" is expected. The high resolution also enabled the decay widths of these states to be measured..
118. Y. Tameshige, K. Hatanaka, K. Sagara, M. Dozono, K. Fujita, E. Ihara, T. Kaneda, M. Kato, T. Kawabata, S. Kuroita, Y. Maeda, H. Matsubara, H. Okamura, Y. Sakemi, K. Sekiguchi, Y. Shimizu, T. Sugimoto, A. Tamii, T. Wakasa, Measurement of Azz of pd radiative capture at Ed=196MeV, Few-Body Systems, 10.1007/s00601-008-0285-8, 44, 1-4, 179-181, 2008.11, In our previous measurement of pd radiative capture at Ed = 137 and 196MeV, we found an interesting fact that the measured tensor analyzing powers show the relation Axx ≈ Ayy, although calculated Axx and Ayy are apparently different, Axx ≠ Ayy. The measured Ayy agrees fairly well with the 3N calculations, and the measured Axx largely disagrees with calculated Axx. Similar experiments on pd capture have been made at KVI at nearly the same energies of 130-180MeV. The KVI data also support Axx ≈ Ayy relation, but absolute values of Axx and Ayy at KVI are about half of RCNP data. Therefore, we made a new experiment of pd capture at Ed =196MeV. Azz was measured in three different ways, and data analysis is in progress. Preliminary data seem to support our previous data..
119. S. Kuroita, K. Sagara, T. Kudoh, T. Sueta, T. Sugimoto, H. Shimoda, Y. Yamada, Tomotsugu Wakasa, Tetsuo Noro, Y. Tameshige, Y. Shimizu, T. Ishida, J. Kamiya, Y. Sakemi, A. Tamii, K. Hatanaka, Measurements of the inclusive pd breakup cross section at low and intermediate energies, Few-Body Systems, 10.1007/s00601-008-0255-1, 44, 1-4, 53-56, 2008.11, Inclusive measurements of the D(p, p)pn reaction were made at incident proton energies of 248MeV and 13MeV, to investigate the global feature of the pd breakup reaction at intermediate and low energies. At 248MeV, the cross section and analyzing power Ay were measured at four angles from 7°C to 20°C. The data largely disagree with Faddeev calculations even if 2π-exchange three-nucleon force (2π3NF) or Δ-isobar is included, and the disagreement increases at forward angles. At 13MeV, the cross section was measured at eight angles from 10°C to 70°C. The data are well reproduced by a recent pd Faddeev calculation, and the effects of Δ-isobar at 13MeV are very small..
120. E.Ihara, T.Wakasa, M.Dozono, K.Hatanaka, T.Imamura, M.Kato, S.Kuroita, H.Matsubara, T.Noro, H.Okamura, K.Sagara, Y.Sakemi, K.Sekiguchi, K.Suda, T.Sueta, Y.Tameshige, A.Tamii, H.Tanabe, Y.Yamada , Cross sections and analyzing powers for (p, n) reactions on 3He and 4He at 346 MeV, Physical Review C, Phys.Rev. C 78, 024607 (2008)

, 2008.08.
121. E. Ihara, T. Wakasa, M. Dozono, K. Hatanaka, T. Imamura, M. Kato, S. Kuroita, H. Matsubara, T. Noro, H. Okamura, K. Sagara, Y. Sakemi, K. Sekiguchi, K. Suda, T. Sueta, Y. Tameshige, A. Tamii, H. Tanabe, Y. Yamada, Cross sections and analyzing powers for (p,n) reactions on He3 and He4 at 346 MeV, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.78.024607, 78, 2, 2008.08, The cross sections and analyzing powers for (p,n) reactions on He3 and He4 have been measured at a bombarding energy of Tp=346 MeV and reaction angles of 8=9.4-27°. The energy transfer spectra for 3He(p,n) at large 8 (16°) are dominated by quasielastic contributions and can be reasonably reproduced by plane-wave impulse approximation (PWIA) calculations for quasielastic scattering. By contrast, the known L=1 resonances in Li4 are clearly observed near the threshold in the 4He(p,n) spectra. Because these contributions are remarkable at small angles, the energy spectra are significantly different from those expected for quasielastic scattering. The data are compared with the PWIA calculations, and it is found that the quasielastic contributions are dominant at large 8 (22°). The nuclear correlation effects on the quasielastic peak for 4He(p,n) are also discussed..
122. K. Yako, H. Sakai, M. B. Greenfield, K. Hatanaka, M. Hatano, J. Kamiya, Y. Maeda, K. Nagayama, H. Okamura, K. Sekiguchi, Y. Shimizu, K. Suda, A. Tamii, Tomotsugu Wakasa, The RCNP (n,p) facility, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2008.03.014, 592, 1-2, 88-99, 2008.07, A facility for studying (n,p) reactions at neutron kinetic energies of 140 ≲ Tn ≲ 300 MeV has been constructed by using the existing Large Acceptance Spectrometer at the Research Center for Nuclear Physics, Osaka University. A neutron beam produced by the 7Li(p,n) reaction hits the (n,p) targets located in a segmented target system, which allows one to use a relatively thick target in total (∼ 0.5 g / cm2) with a moderate energy resolution of ∼ 1 MeV. The facility enables one to obtain spectra at 300 MeV up to an excitation energy of 70 MeV with a single setting of the spectrometer. This (n,p) facility has a large effective solid angle of 11 msr for an effective target size of 30W × 20H mm2..
123. T. Wakasa, E. Ihara, M. Dozono, K. Hatanaka, T. Imamura, M. Kato, S. Kuroita, H. Matsubara, T. Noro, H. Okamura, K. Sagara, Y. Sakemi, K. Sekiguchi, K. Suda, T. Sueta, Y. Tameshige, A. Tamii, H. Tanabe, Y. Yamada, Complete set of polarization transfer coefficients for the 3He(p,n) reaction at 346 MeV and 0 degrees, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.77.054611, 77, 5, 2008.05, We report measurements of the cross-section and a complete set of polarization transfer coefficients for the 3He(p,n) reaction at a bombarding energy Tp=346 MeV and a reaction angle θlab=0°. The data are compared with the corresponding free nucleon-nucleon values on the basis of the predominance of quasielastic scattering processes. Significant discrepancies have been observed in the polarization transfer DLL(0°), which are presumably the result of the three-proton T=3/2 resonance. The spin-parity of the resonance is estimated to be 1/2-, and the distribution is consistent with previous results obtained for the same reaction at Tp=48.8 MeV..
124. S. Kuroita, K. Sagara, T. Kudoh, T. Sueta, H. Shimoda, T. Sugimoto, Y. Yamada, Tomotsugu Wakasa, Tetsuo Noro, Y. Tameshige, A. Tamii, K. Hatanaka, Measurements of inclusive pd breakup cross sections at low and intermediate energies, International Symposium on New Facets of the Three Nucleon Force - 50 Years of the Fujita-Miyazawa Three Nucleon Force, FM50 NEW FACET OF THREE NUCLEON FORCE - 50 YEARS OF FUJITA MIYAZAWA THREE NUCLEON FORCE (FM50) - Proceedings of the International Symposium, 10.1063/1.2932313, 98-102, 2008.05, Inclusive experiments for D(p,p)pn breakup were performed at incident proton energies of 247 MeV and 13 MeV. At 247 MeV, the cross sections and analyzing power Ay measured at angles from 7° to 20° largely disagree with calculations even if a 2π-exchange three-nucleon force (2π3NF) effects are included, and the disagreement increases at forward angles. At 13 MeV, cross section measured at angles from 10° to 70° agrees well with pd calculation and 2π3NF effects are small. The large disagreement in pd breakup at 247 MeV may have some relationship with disagreements in pd scattering at 250 MeV..
125. Y. Maeda, M. Dozono, K. Hatanaka, E. Ihara, T. Kawabata, H. Matsubara, S. Noji, K. Sagara, S. Sakaguchi, H. Sakai, Y. Sasamoto, M. Sasano, K. Sekiguchi, Y. Shimizu, K. Suda, M. Takechi, Y. Tameshige, A. Tamii, T. Uesaka, T. Wakasa, K. Yako, Measurements of the2H(p→, 2p)n breakup reaction at 250 MeV, International Symposium on New Facets of the Three Nucleon Force - 50 Years of the Fujita-Miyazawa Three Nucleon Force, FM50 NEW FACET OF THREE NUCLEON FORCE - 50 YEARS OF FUJITA MIYAZAWA THREE NUCLEON FORCE (FM50) - Proceedings of the International Symposium, 10.1063/1.2932286, 183-187, 2008.05, Recently it was found that, the differential cross sections of elastic Nd scattering below 150 MeV can be well reproduced by incorporating a 3NF in Faddeev calculations based on modern nucleon-nucleon (NN) interactions. On the other hand, the differential cross sections for nd and pd at 250 MeV show large discrepancies between the data and the Faddeev calculations with a 3NF. This indicates the existence of the missing features of the three nucleon force in this energy region. For the next step in the 3NF study, we have measured the vector analyzing power Ay and the differential cross sections for the 2H(p̄, pp)n breakup reaction at 250 MeV. The experiment, was carried out by detecting two protons in the final state with using the double-armed spectrometer Grand Raiden (GR) and the Large Acceptance Spectrometer (LAS) at the Research Center for Nuclear Physics (RCNP). The data was compared with the results of Faddeev calculations with and without a 3NF..
126. Ema Ihara, Tomotsugu Wakasa, Masanori Dozono, and Yasuhiro Sakemi, High Rate Production of Polarized 3He with Meta-Stability Exchange Method , Journal of the Physical Society of Japan, 77, 025002, 2008.02.
127. Ema Ihara, Tomotsugu Wakasa, Masanori Dozono, Yasuhiro Sakemi, High rate production of polarized 3He with meta-stability exchange method, journal of the physical society of japan, 10.1143/JPSJ.77.025002, 77, 2, 2008.02.
128. Masanori Dozono, Tomotsugu Wakasa, Ema Ihara, Shun Asaji, Kunihiro Fujita, Kichiji Hatanaka1, Takashi Ishida, Takaaki Kaneda, Hiroaki Matsubara, Yuji Nagasue, Tetsuo Noro, Yasuhiro Sakemi, Yohei Shimizu, Hidemitsu Takeda, Yuji Tameshige, Atsushi Tamii, and Yukiko Yamada , Complete Set of Polarization Transfer Observables for the 12C( p,n) Reaction at 296 MeV and 0°
, Journal of the Physical Society of Japan, 77, 014201, 2008.01.
129. Masanori Dozono, Tomotsugu Wakasa, Ema Ihara, Shun Asaji, Kunihiro Fujita, Kichiji Hatanaka, Takashi Ishida, Takaaki Kaneda, Hiroaki Matsubara, Yuji Nagasue, Tetsuo Noro, Yasuhiro Sakemi, Yohei Shimizu, Hidemitsu Takeda, Yuji Tameshige, Atsushi Tamii, Yukiko Yamada, Complete set of polarization transfer observables for the 12C(p, n) reaction at 296MeV and 0°, journal of the physical society of japan, 10.1143/JPSJ.77.014201, 77, 1, 2008.01, A complete set of polarization transfer observables has been measured for the 12C(p, n) reaction at Tp = 296MeV and θlab = 0°. The measured polarization transfer observables indicate that the spin-dipole resonance at Ex ≃ 7MeV has greater 2- strength than 1- strength, which is consistent with recent experimental and theoretical studies. The total spin transfer Σ(0°) deduced from the polarization transfer observables indicates a predominance of the spin-flip strength in the continuum. The exchange tensor interaction at a large momentum transfer of Q ≃ 3:6 fm-1 is discussed..
130. E. V. Karpechev, A. B. Kurepin, A. I. Reshetin, T. L. Karavicheva, Kunihiro Fujita, K. Hatanaka, J. Kamiya, Y. Sakemi, T. Wakasa, H. P. Yoshida, Y. Shimizu, T. Fukuda, P. K. Saha, K. Tamura, T. Ishida, Study of energy dependence of pion production by proton on copper target near 350 MeV, Physics of Atomic Nuclei, 10.1007/s11450-008-1001-3, 71, 1, 1-8, 2008.01, New measurement of the energy dependence of pion production on a copper target near 350-MeV proton energy has been performed. The E-170 experiment has been carried out at the Ring Cyclotron Facility of the Research Center for Nuclear Physics, Osaka University, Japan. A small enhancement of the low-energy pion production cross section was observed near the incident proton energy of 352 MeV..
131. T. Wakasa, M. Dozono, E. Ihara, S. Asaji, K. Fujita, K. Hatanaka, M. Ichimura, T. Ishida, T. Kaneda, H. Matsubara, Y. Nagasue, T. Noro, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tameshige, A. Tamii and Y. Yamada , Study of nuclear correlation effects via 12C(p,n)12N(g.s.,1+) at 296 MeV, PHYSICS LETTERS B, 656, 38-44, 2007.11.
132. T. Wakasa, M. Dozono, E. Ihara, S. Asaji, K. Fujita, K. Hatanaka, M. Ichimura, T. Ishida, T. Kaneda, H. Matsubara, Y. Nagasue, T. Noro, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tameshige, A. Tamii, Y. Yamada, Study of nuclear correlation effects via 12C (over(p, →), over(n, →)) 12N (g.s., 1+) at 296 MeV, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/j.physletb.2007.10.017, 656, 1-3, 38-44, 2007.11, We report measurements of the cross section and a complete set of polarization observables for the Gamow-Teller 12C (over(p, →), over(n, →)) 12N (g.s., 1+) reaction at a bombarding energy of 296 MeV. The data are compared with distorted wave impulse approximation calculations employing transition form factors normalized to reproduce the observed beta-decay ft value. The cross section is significantly under-predicted by the calculations at momentum transfers q ≳ 0.5   fm-1. The discrepancy is partly resolved by considering the non-locality of the nuclear mean field. However, the calculations still under-predict the cross section at large momentum transfers of q ≃ 1.6   fm-1. We also performed calculations employing random phase approximation response functions and found that the observed enhancement can be attributed in part to pionic correlations in nuclei..
133. Y. Shimizu, K. Hatanaka, Y. Tameshige, T. Adachi, Kunihiro Fujita, H. Matsubara, H. Okamura, A. Tamii, A. P. Kobushkin, T. Kawabata, Y. Sasamoto, K. Suda, T. Uesaka, K. Itoh, Y. Sakemi, T. Wakui, M. Uchida, T. Kudoh, K. Sagara, Tomotsugu Wakasa, H. P. Yoshida, Y. Shimbara, E. A. Strokovsky, S. Ishikawa, M. Tanifuji, Spin correlation parameter Cyy of p+He3 elastic backward scattering, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.76.044003, 76, 4, 2007.10, We measured the differential cross section and the spin correlation parameter Cyy of the p→+3He→ elastic backward scattering at 200, 300, and 400 MeV at θ=180° in the center-of-mass frame to study the mechanism of the reaction and to examine the validity of the He3 wave functions based on two different realistic two-body forces. This is the first measurement of the spin correlation parameter Cyy of the p→+3He→ EBS at intermediate energies. The experimental results were compared with few-body calculations, including three reaction mechanisms: two-nucleon-pair exchange, pion exchange, and direct pp scattering. It was found that few-body calculations describe the differential cross-section data reasonably well. The spin correlation parameter Cyy shows clear evidence for the two-nucleon-pair exchange processes in the reaction, demonstrating that the spin observables are helpful for deeper understanding of the reaction mechanism..
134. T. Wakasa, E. Ihara, K. Fujita, Y. Funaki, K. Hatanaka, H. Horiuchi, M. Itoh, J. Kamiya, G. Röpke, H. Sakaguchi, N. Sakamoto, Y. Sakemi, P. Schuck, Y. Shimizu, M. Takashina, S. Terashima, A. Tohsaki, M. Uchida, H.P. Yoshida and M. Yosoi , New candidate for an alpha cluster condensed state in 16O(alpha,alpha') at 400 MeV , PHYSICS LETTERS B, 653, 173-177, 2007.09.
135. Y. Maeda, T. Uesaka, T. Kawabata, K. Suda, Y. Sasamoto, Satoshi Sakaguchi, H. Sakai, K. Yako, M. Sasano, S. Noji, K. Hatanaka, A. Tamii, Y. Shimizu, M. Takechi, Y. Tameshige, H. Matsubara, K. Sagara, Tomotsugu Wakasa, M. Dozono, E. Ihara, K. Sekiguchi, Measurement of Ay for the pd breakup reaction at 250 MeV, 17th International Spin Physics Symposium Proceedings of the 17th International Spin Physics Symposium, 10.1063/1.2750894, 781-784, 2007.09, From the recent studies, it has been found that the differential cross sections of the elastic Nd scattering at the energy below 150 MeV can be well reproduced by incorporating the 3NF in the Faddeev calculation based on modern nucleon-nucleon (NN) interactions. On the other hand, the differential cross sections of nd and pd at 250 MeV show large discrepancies between the data and the Faddeev calculations with 3NF. It indicates the presence of the missing features of the three nucleon system at this energy region. For the next step of the 3NF study, we measured the vector analyzing power Ay and the differential cross sections for the 2H(p, pp)n breakup reaction at 250 MeV. The experiment was carried out by detecting two protons in the final state with using the double-armed spectrometer Grand Raiden (GR) and Large Acceptance Spectrometer (LAS) at Research Center for Nuclear Physics (RCNP). These data provide important information on the 3NF effects and make a discrimination between 3NF models..
136. A. Tamii, M. Dozono, Kunihiro Fujita, K. Hatanaka, E. Ihara, T. Kaneda, H. Kuboki, Y. Maeda, H. Matsubara, T. Ohta, H. Okamura, H. Sakai, Y. Sakemi, Y. Satou, K. Sekiguchi, K. Suda, M. Takechi, Y. Tameshige, H. Tanabe, N. Uchigashima, T. Uesaka, T. Wakasa, K. Yako, Measurement of cross section and various spin observables in the pd elastic scattering at 392 MeV, 17th International Spin Physics Symposium Proceedings of the 17th International Spin Physics Symposium, 10.1063/1.2750890, 765-768, 2007.09, The cross sections and spin observables of the pd elastic scattering have been measured at 392 MeV. The results are compared with the prediction of Faddeev calculations with and without including a three nucleon force..
137. T. Wakasa, E. Ihara, Kunihiro Fujita, Y. Funaki, K. Hatanaka, H. Horiuchi, M. Itoh, J. Kamiya, G. Röpke, H. Sakaguchi, N. Sakamoto, Y. Sakemi, P. Schuck, Y. Shimizu, M. Takashina, S. Terashima, A. Tohsaki, M. Uchida, H. P. Yoshida, M. Yosoi, New candidate for an alpha cluster condensed state in 16O (α, α) at 400 MeV, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/j.physletb.2007.08.016, 653, 2-4, 173-177, 2007.09, Inelastic α scattering on 16O is studied at 400 MeV using an ice target. Near the 4α breakup threshold of 14.4 MeV, a broad peak is observed at an excitation energy of 13.6 ± 0.1  MeV with a width of 0.6 ± 0.2  MeV. The spin-parity is estimated to be 0+ from the momentum-transfer dependence. The observed width is significantly larger than that of the 0+ state at 12.0 MeV with the α + 12C structure, indicating a well-developed α cluster structure. The magnitude of the cross section is sensitive to the density distribution of the constituent α clusters. The observed cross section is consistent with the theoretical prediction for the α cluster condensed state, characterized by its dilute density distribution with a large root-mean-square radius..
138. Kunihiro Fujita, Y. Sakemi, S. Asaji, M. Dozono, K. Hatanaka, E. Ihara, T. Kaneda, H. Matsubara, H. Okamura, Y. Shimizu, Y. Tameshige, A. Tamii, Tomotsugu Wakasa, Proton induced coherent pion production, 17th International Spin Physics Symposium Proceedings of the 17th International Spin Physics Symposium, 10.1063/1.2750899, 803-806, 2007.09, The short range component of the nucleon-nucleus interaction is phenomenologically described by effective interaction including the so-called Landau-Migdal parameters g′, among which only g ΔΔ has been left unfixed because of the scarcity of experimental information. We propose Coherent Pion Production (CPP) measurement 12C(p, nπ+)12C(g.s.) to get quantitative information on gΔΔ. A preliminary CPP experiment was performed at the RCNP neutron time of flight facility by involving exclusive measurement of pions and neutrons. We have specially developed for this purpose a new pion counter and embedded it in the beam swinger magnet of the neutron time of flight facility. We describe the experiment and preliminary result from the pion-neutron coincidences..
139. Y. Tameshige, K. Sagara, T. Kudoh, M. Shiota, S. Shimomoto, T. Wakasa, K. Hatanaka, Y. Sakemi, A. Tamii, H. P. Yoshida, H. Kamada, H. Witała, Tensor analyzing powers of pd radiative capture, 17th International Spin Physics Symposium Proceedings of the 17th International Spin Physics Symposium, 10.1063/1.2750892, 773-776, 2007.09, A measurement of tensor analyzing power Axx and Ayy of H(d, 3He)γ reaction at Ed = 137 MeV was made at RCNP. Both the relation of Axx ≈ Ayy and the discrepancy in Axx between experiment and calculations were confirmed at 137 MeV, in consistent with our previous measurement at 196 MeV. Present data are compared with KVI data at 133 MeV..
140. Y. Maeda, H. Sakai, K. Fujita, M. B. Greenfield, K. Hatanaka, M. Hatano, J. Kamiya, T. Kawabata, H. Kuboki, H. Okamura, J. Rapaport, T. Saito, Y. Sakemi, M. Sasano, K. Sekiguchi, Y. Shimizu, K. Suda, Y. Tameshige, A. Tamii, T. Wakasa, K. Yako, J. Blomgren, P. Mermod, Öhrn A., Österlund M., H. Witała, A. Deltuva, A. C. Fonseca, P. U. Sauer, W. Glöckle, J. Golak, H. Kamada, A. Nogga, R. Skibiński, Differential cross section and analyzing power measurements for n→d elastic scattering at 248 MeV, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.76.014004, 76, 1, 2007.07, The differential cross sections and vector analyzing powers for nd elastic scattering at En=248 MeV were measured for 10°-180° in the center-of-mass (c.m.) system. To cover the wide angular range, the experiments were performed separately by using two different setups for forward and backward angles. The data are compared with theoretical results based on Faddeev calculations with realistic nucleon-nucleon (NN) forces such as AV18, CD Bonn, and Nijmegen I and II, and their combinations with the three-nucleon forces (3NFs), such as Tucson-Melbourne 99 (TM99), Urbana IX, and the coupled-channel potential with Δ-isobar excitation. Large discrepancies are found between the experimental cross sections and theory with only 2N forces for θc.m.>90°. The inclusion of 3NFs brings the theoretical cross sections closer to the data but only partially explains this discrepancy. For the analyzing power, no significant improvement is found when 3NFs are included. Relativistic corrections are shown to be small for both the cross sections and the analyzing powers at this energy. For the cross sections, these effects are mostly seen in the very backward angles. Compared with the pd cross section data, quite significant differences are observed at all scattering angles that cannot be explained only by the Coulomb interaction, which is usually significant at small angles..
141. Y. Maeda, H. Sakai, Kunihiro Fujita, M. Hatano, J. Kamiya, T. Kawabata, H. Kuboki, K. Hatanaka, H. Okamura, T. Saito, Y. Sakemi, M. Sasano, K. Sekiguchi, Y. Shimizu, K. Suda, Y. Tameshige, A. Tamii, Tomotsugu Wakasa, K. Yako, M. B. Greenfield, H. Kamada, H. Witała, Measurements of the over(n, →) d scattering at 250 MeV and three-nucleon forces, Nuclear Physics A, 10.1016/j.nuclphysa.2007.03.138, 790, 1-4, 430c-433c, 2007.06, The differential cross sections and the vector analyzing powers for the nd elastic scattering at En = 250 MeV have been measured for the study of the three-nucleon force (3NF) effects in the Coulomb-free system. To cover a wide angular region, the experiments were performed by using two different methods at the (n, p) facility and at the NTOF facility which constructed at the Research Center for Nuclear Physics (RCNP). The results were compared with theoretical predictions of the Faddeev calculations based on the modern nucleon-nucleon (NN) forces with the three-nucleon force (3NF). The inclusion of 3NFs leads to a good description of the cross section except for the backward angles. The results were also compared with the theoretical predictions with relativistic corrections. The direct data-to-data comparison of the cross sections of the nd and pd was performed..
142. K. Sekiguchi, H. Sakai, N. Sakamoto, H. Kuboki, M. Sasano, Y. Takahashi, K. Yako, T. Kawabata, Y. Maeda, Satoshi Sakaguchi, Y. Sasamoto, K. Suda, T. Uesaka, H. Okamura, K. Itoh, Tomotsugu Wakasa, Study of spin parts of three nucleon forces via over(d, →) p breakup reactions at intermediate energies, Nuclear Physics A, 10.1016/j.nuclphysa.2007.03.174, 790, 1-4, 450c-453c, 2007.06, Measurements of deuteron-proton breakup reactions at 135 MeV/A have been made at RIKEN Accelerator Research Facility, focusing on the specific coplanar configurations. The obtained results are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne99, and UrbanaIX three nucleon forces..
143. Y. Tameshige, K. Sagara, T. Kudoh, M. Shiota, S. Shimomoto, Tomotsugu Wakasa, K. Hatanaka, A. Tamii, Y. Sakemi, Y. Shimizu, H. P. Yoshida, H. Kamada, H. Witała, Tensor analyzing powers of pd radiative capture at Eover(d, →) = 137  MeV, Nuclear Physics A, 10.1016/j.nuclphysa.2007.03.175, 790, 1-4, 446c-449c, 2007.06, A measurement of tensor analyzing power Ax x and Ay y of H (over(d, →), 3He) γ reaction at Eover(d, →) = 137  MeV was made at RCNP. Both the relation of Ax x ≈ Ay y and the discrepancy in Ax x between experiment and calculations were confirmed at 137 MeV, in consistent with our previous measurement at 196 MeV. Present data are compared with KVI data at 133 MeV..
144. T. Kawabata, H. Akimune, H. Fujita, Y. Fujita, M. Fujiwara, K. Hara, K. Hatanaka, M. Itoh, Y. Kanada-En'yo, S. Kishi, K. Nakanishi, H. Sakaguchi, Y. Shimbara, A. Tamii, S. Terashima, M. Uchida, Tomotsugu Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi, Three-body cluster state in 11B, Nuclear Physics A, 10.1016/j.nuclphysa.2007.03.047, 790, 1-4, 290c-293c, 2007.06, The cluster structures of the excited states in 11B are studied by analyzing the isoscalar monopole and quadrupole strengths in the 11B(d,d) reaction at Ed = 200  MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3 / 23 - state at Ex = 8.56  MeV is well described by the AMD calculation and is an evidence for a developed three-body 2 α + t cluster structure..
145. Masaki Sasano, Hideyuki Sakai, Kentaro Yako, Hironori Kuboki, Kenjiro Miki, Shumpei Noji, Tomotsugu Wakasa, Masanori Dozono, Kimiko Sekiguchi, Tomohiro Uesaka, Takahiro Kawabata, Yukie Maeda, Satoshi Sakaguchi, Yoshiko Sasamoto, Kenji Suda, Keisuke Itoh, Kichiji Hatanaka, Hiroyuki Okamura, Atsushi Tamii, Kazuo Muto, Dieter Frekers, M. B. Greenfield, Determination of the Gamow-Teller transition strength to 116In(g.s.) by the 116Cd(p,n) reaction at 300 MeV for the study of the nuclear matrix element of the two-neutrino double beta decay, Nuclear Physics A, 10.1016/j.nuclphysa.2007.01.051, 788, 1-4, 76-81, 2007.05, The 116Cd(p,n) experiment at 300 MeV has been performed for deducing the Gamow-Teller (GT) transition strengths B(GT-) in 116In. For the transition to the ground state, the B(GT-) value of 0.26 ± 0.02 is obtained. From this B(GT-) value and the B(GT+) value by a beta-decay experiment, the contribution of the intermediate ground state of 116In to the nuclear matrix element is deduced to be 0.070 ± 0.003. The B(GT-) value obtained herein is a factor of 8 less than that obtained from a previous (3He,t) measurement. This discrepancy, as well as differences in the distribution of low energy GT strength, and the width and peak energy of the GT giant resonance may be explained if the target used in the (3He,t) measurement is a Cd target with natural abundance..
146. T. Kawabata, H. Akimune, H. Fujita, Y. Fujita, M. Fujiwara, K. Hara, K. Hatanaka, M. Itoh, Y. Kanada-En'yo, S. Kishi, K. Nakanishi, H. Sakaguchi, Y. Shimbara, A. Tamii, S. Terashima, M. Uchida, T. Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi, Dilute 2 α + t cluster structure in 11B, Nuclear Physics A, 10.1016/j.nuclphysa.2007.01.016, 788, 1-4, 301-306, 2007.05, The cluster structures of the excited states in 11B are studied by analyzing the isoscalar monopole and quadrupole strengths in the 11B(d,d′) reaction at Ed = 200  MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3 / 23- state at Ex = 8.56  MeV is well described by the AMD calculation and is an evidence for a developed 2 α + t cluster structure..
147. T. Adachi, Y. Fujita, P. von Brentano, G. P.A. Berg, C. Fransen, D. De Frenne, H. Fujita, Kunihiro Fujita, K. Hatanaka, M. Honma, E. Jacobs, J. Kamiya, K. Kawase, T. Mizusaki, K. Nakanishi, A. Negret, T. Otsuka, N. Pietralla, L. Popescu, Y. Sakemi, Y. Shimbara, Y. Shimizu, Y. Tameshige, A. Tamii, M. Uchida, T. Wakasa, M. Yosoi, K. O. Zell, Gamow-Teller transitions in pf-shell nuclei studied in (3He, t) reactions, Nuclear Physics A, 10.1016/j.nuclphysa.2007.01.050, 788, 1-4, 70-75, 2007.05, The Gamow-Teller transition strengths in pf-shell nuclei are important parameters in a presupernova model. A high resolution (3He, t) reaction was performed from Tz = + 1 nuclei (42Ca, 46Ti, 50Cr and 54Fe) to Tz = 0 nuclei (42Sc, 46V, 50Mn and 54Co) at an incident energy of 140 MeV/nucleon and at 0°for the precise study of GT transition strengths B(GT). To derive B(GT) values for these pf-shell nuclei, the R2 value, the ratio between the GT and Fermi unit cross sections, was introduced. The R2 values were studied for various mass nuclei by using the B(GT) values from β-decay studies as standard, and the mass dependence was derived. It was found that GT strengths in these four pf-shell nuclei move to higher excitation energies as the mass number A increases. The obtained GT strength distributions were compared with shell model calculations..
148. T. Kawabata, H. Akimune, H. Fujita, Y. Fujita, M. Fujiwara, K. Hara, K. Hatanaka, M. Itoh, Y. Kanada-En'yo, S. Kishi, K. Nakanishi, H. Sakaguchi, Y. Shimbara, A. Tamii, S. Terashima, M. Uchida, Tomotsugu Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi, 2 α + t cluster structure in 11B, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/j.physletb.2006.11.079, 646, 1, 6-11, 2007.03, The cluster structures of the excited states in 11B are studied by analyzing the isoscalar monopole and quadrupole strengths in the 11B (d, d) reaction at Ed = 200   MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. The large monopole strength for the 3 / 23- state at Ex = 8.56   MeV is well described by the AMD calculation and is suggested to be an evidence for a well developed 2 α + t cluster structure..
149. K. Suda, H. Okamura, T. Uesaka, J. Nishikawa, H. Kumasaka, R. Suzuki, H. Sakai, A. Tamii, T. Ohnishi, K. Sekiguchi, K. Yako, S. Sakoda, H. Kato, M. Hatano, Y. Maeda, T. Saito, T. Ishida, N. Sakamoto, Y. Satou, K. Hatanaka, Tomotsugu Wakasa, J. Kamiya, Absolute calibration of the deuteron beam polarization at intermediate energies via the 12C(over(d, ⇒), α)10B*[2+] reaction, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2006.11.040, 572, 2, 745-753, 2007.03, The 12C(over(d, ⇒), α)10B *[2+] reaction at 0{ring operator} has been proposed as a new tool to calibrate the deuteron beam polarization at intermediate energies. The absolute values of the deuteron polarizations were extracted for the first time by using this reaction at 270 and 140 MeV deuteron energies. The analyzing powers for the over(d, ⇒)-p elastic scattering, which is used as a secondary reaction of a polarimetry, were determined by the new method..
150. T. Wakasa, Y. Hagihara, T. Noro, T. Ishida, S. Asaji, Y. Nagasue, K. Hatanaka, Y. Sakemi, A. Tamii, Y. Shimizu, K. Fujita, Y. Tameshige, H. Sakai, H. Kuboki, M. Sasano, M. Ichimura, H. Kamada and M. Yamaguchi , Isovector effective NN interaction in 28Si(p,n)28P(6-) at 198 MeV , PHYSICS LETTERS B, 645, 402-407, 2007.02.
151. K. Hatanaka, S. Ninomiya, Y. Sakemi, T. Wakasa, T. Kawaguchi, N. Takahashi, Development of a HTS magnet and application to a beam scanner, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2006.10.294, 571, 3, 583-587, 2007.02, A solenoid magnet using high-temperature superconductor tape was designed, fabricated, and tested for its suitability as beam scanner. After successful cooling tests, the magnet performance was studied using DC and AC currents. With DC current the magnet was successfully operated as mirror coils for a 2.45 GHz ECR ion source. The coils could be operated at 100 A and frequencies above 1 Hz. The installation of iron pole pieces and return yokes, enabled us to generate fields in excess of 2 T at 197 A DC. In AC mode this magnet can be operated in the ranges of 0.14-1.73 and 1.22-1.67 T at frequencies of 0.05 and 0.25 Hz, respectively..
152. T. Wakasa, Y. Hagihara, T. Noro, T. Ishida, S. Asaji, Y. Nagasue, K. Hatanaka, Y. Sakemi, A. Tamii, Y. Shimizu, Kunihiro Fujita, Y. Tameshige, H. Sakai, H. Kuboki, M. Sasano, M. Ichimura, H. Kamada, M. Yamaguchi, Isovector effective NN interaction in 28Si (over(p, →), over(n, →)) 28P (6-) at 198 MeV, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/j.physletb.2006.12.069, 645, 5-6, 402-407, 2007.02, We report measurements of the cross section and a complete set of polarization observables for the 28Si (over(p, →), over(n, →)) 28P (6-) reaction at a bombarding energy of 198 MeV. The data are compared with distorted wave impulse approximation calculations employing response functions normalized to inelastic electron scattering. The spin-longitudinal polarized cross section I Dq is slightly over-predicted by the calculations, while the normal spin-transverse polarized cross section I Dn is significantly under-predicted. The calculated in-plane spin-transverse I Dp and spin-scalar I D0 polarized cross sections agree well with the experimental data. These results are consistent with those for 28Si (over(p, →), over(p, →)) 28Si (6-, T = 1) scattering at the same energy, and thus it is concluded that isospin-mixing effects are not responsible for the discrepancy between theory and experiment in the (over(p, →), over(p, →)) case. Energy half-off-shell effects as medium effects on the effective nucleon-nucleon interaction are also investigated and found to be too small to be responsible for the discrepancy..
153. Y. Fujita, I. Hamamoto, H. Fujita, Y. Shimbara, T. Adachi, G. P.A. Berg, Kunihiro Fujita, K. Hatanaka, J. Kamiya, K. Nakanishi, Y. Sakemi, Y. Shimizu, M. Uchida, T. Wakasa, M. Yosoi, Identification of the [2 0 2]3/2 deformed band in mirror nuclei 25Mg and 25Al and implications for unstable nuclei, International Conference on Finite Fermionic Systems: Nilsson Model 50 Years Physica Scripta T, 10.1088/0031-8949/2006/T125/047, T125, 194-195, 2006.12, Fifty years after its prediction, the highest-lying [2 0 2]3/2 orbit among the six Nilsson single-particle orbits originating from the sd shell in prolately deformed nuclei and the rotational band on this orbit were identified. The band members were observed in 25Al at excitation energies of 6-7.5MeV in a high-resolution 25Mg(3He, t) charge-exchange reaction at 0° having a strong selectivity for Gamow-Teller transitions. In comparison with the analogous M1 transitions in 25Mg, the J π=3/2+ band-head state and the excited 5/2+ and 7/2+ members were clearly assigned..
154. T. Kawabata, H. Akimune, H. Fujita, M. Fujiwara, K. Hara, K. Hatanaka, K. Nakanishi, Y. Shimbara, A. Tamii, H. P. Yoshida, M. Yosoi, Y. Fujita, M. Itoh, Y. Kanada-En'yo, S. Kishi, H. Sakaguchi, S. Terashima, Y. Yasuda, M. Uchida, Tomotsugu Wakasa, 2α + t cluster state in 11B, Modern Physics Letters A, 21, 31-33, 2383-2392, 2006.10, The cluster structures of the excited states in 11B are studied by analyzing the isoscalar monopole and quadrupole strengths in the 11B(d,d′) reaction at Ed = 200 MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3/23- state at E x = 8.56 MeV is well described by the AMD calculation and is an evidence for a developed 2α + t cluster structure..
155. T. Kawabata, H. Akimune, H. Fujita, Y. Fujita, M. Fujiwara, K. Hara, K. Hatanaka, M. Itoh, Y. Kanada-En'Yo, S. Kishi, K. Nakanishi, H. Sakaguchi, Y. Shimbara, A. Tamii, S. Terashima, M. Uchida, Tomotsugu Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi, 2α + t cluster state in 11B, Journal of Physics: Conference Series, 10.1088/1742-6596/49/1/052, 49, 1, 210-211, 2006.10, The cluster structures of the excited states in 11B are studied by analyzing the isoscalar monopole and quadrupole strengths in the 11B(d, d′) reaction at Ed 200 MeV. The excitation strengths are compared with the theoretical predictions by the antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3/2-3 state at Ex 8.56 MeV is well described by the AMD wave function with a dilute 2α + tcluster structure..
156. M. Ichimura, H. Sakai, T. Wakasa, Spin-isospin responses via (p,n) and (n,p) reactions, Progress in Particle and Nuclear Physics, 10.1016/j.ppnp.2005.09.001, 56, 2, 446-531, 2006.04, Recent progress in the study of spin-isospin responses by charge exchange (p,n) and (n,p) reactions at 300-500 MeV is reviewed with special emphases on quenching of the total Gamow-Teller (GT) strength at a momentum transfer q=0fm-1 and enhancement of the spin-longitudinal (pionic) response in quasielastic scattering (QES) at q≈1.7fm-1. This progress has been made possible by the development of experimental techniques such as polarization transfer measurements for (p,n) reactions and quasi-monochromatic neutron beam production for (n,p) measurements. Currently operating (p→,n→) and (n,p) facilities are described. We present a detailed method of multipole decomposition analysis to extract GT strengths from the continuum spectra of the Zr90(p,n) and (n,p) reactions. From the obtained GT strength distributions, a quenching factor Q with respect to the GT sum rule value of 3(N-Z) can be derived. We also describe a method to obtain the polarized cross section IDi for the QES region from a complete set of polarization transfer coefficients Dij for the (p→,n→) reaction. The peak position of the GT giant resonance, the quenching factor Q, and the spin-longitudinal cross section IDq are used to estimate the values for the Landau-Migdal parameters, giving gNN′=0.6-0.7 and gNΔ′=0.2-0.4, which are appropriate for the wide range q≈0-1.7fm-1. This small gNΔ′ value leads to a large increase in pionic attraction in a large momentum transfer region. One possible consequence of this is a reduction of the critical density of pion condensation, which is briefly touched upon. Another consequence is precursor phenomena of pion condensation in the normal nuclear density which appear in the enhancement of IDq. Basic theoretical elements, including the Δ isobar degrees of freedom for analyzing experimental data, are described. Treatments of the continuum in reactions as well as in nuclear structure are emphasized. The framework of the distorted wave impulse approximation as well as two-step processes using the response functions in the continuum random phase approximation is described..
157. Y. Kalmykov, T. Adachi, G. P.A. Berg, H. Fujita, K. Fujita, Y. Fujita, K. Hatanaka, J. Kamiya, K. Nakanishi, P. Von Neumann-Cosel, V. Yu Ponomarev, A. Richter, N. Sakamoto, Y. Sakemi, A. Shevchenko, Y. Shimbara, Y. Shimizu, F. D. Smit, T. Wakasa, J. Wambach, M. Yosoi, Fine structure of the Gamow-Teller resonance in Nb90 and level density of 1+ states, Physical Review Letters, 10.1103/PhysRevLett.96.012502, 96, 1, 2006.01, The fine structure of the Gamow-Teller resonance in a medium-heavy nucleus is observed for the first time in a high-resolution Zr90(He3,t)Nb90 experiment at the Research Center for Nuclear Physics, Osaka. Using a novel wavelet analysis technique, it is possible to extract characteristic energy scales and to quantify their relative importance for the generation of the fine structure. This method combined with the selectivity of the reaction permits an extraction of the level density of 1+ states in Nb90..
158. T. Adachi, Y. Fujita, P. Von Brentano, A. F. Lisetskiy, G. P.A. Berg, C. Fransen, D. De Frenne, H. Fujita, Kunihiro Fujita, K. Hatanaka, M. Honma, E. Jacobs, J. Kamiya, K. Kawase, T. Mizusaki, K. Nakanishi, A. Negret, T. Otsuka, N. Pietralla, L. Popescu, Y. Sakemi, Y. Shimbara, Y. Shimizu, Y. Tameshige, A. Tamii, M. Uchida, T. Wakasa, M. Yosoi, K. O. Zell, High-resolution study of Gamow-Teller transitions from the Tz=1 nucleus Ti46 to the Tz=0 nucleus V46, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.73.024311, 73, 2, 2006.01, The Gamow-Teller (GT) transition strengths in fp-shell nuclei are important parameters in presupernova models. A high-energy-resolution (He3,t) experiment was performed on the Tz=1 nucleus Ti46 at 0° and at an intermediate incident energy of 140 MeV/nucleon for the study of precise GT transition strengths to the final Tz=0 nucleus V46. With an energy resolution of 33 keV, individual GT transitions were observed and GT strengths were derived for them up to the excitation energy of 4.5 MeV. The GT strengths were compared with shell-model calculations using various effective interactions. In this low-lying region, most GT states have isospin T=0. A few GT states with isospin T=1 were identified from the existence of the corresponding (analog) M1 states in Ti46. By comparing the GT strength with the corresponding (analogous) M1 transition strength studied in Ti46(e,e') or (γ,γ') measurements, a large constructive interference of orbital and spin terms was suggested for one of these M1 transitions..
159. H. Kuboki, A. Tamii, Kunihiro Fujita, K. Hatanaka, M. Hatano, J. Kamiya, T. Kudoh, Y. Maeda, K. Sagara, T. Saito, H. Sakai, Y. Sakemi, M. Sasano, K. Sekiguchi, Y. Shimizu, S. Shimomoto, M. Shiota, Y. Tameshige, T. Uesaka, Tomotsugu Wakasa, K. Yako, Search for supernarrow dibaryons via the pd→ppX and pd→pdX reactions, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.74.035203, 74, 3, 2006.01, Supernarrow dibaryons (SNDs) have been searched for by the pd→ppX and pd→pdX reactions at Ep=295 MeV over a mass range of 1898 to 1953 MeV, where three candidates of SNDs were found at the Moscow Meson Factory. The experiment was carried out at the Research Center for Nuclear Physics using a two-arm magnetic spectrometer system and a liquid deuterium target. A good mass resolution of 1 MeV and a low background condition were achieved. No resonance structure was observed in the missing mass spectra. Upper limits of the SND production cross section were determined..
160. T. Wakasa, G. P.A. Berg, H. Fujimura, K. Fujita, K. Hatanaka, M. Ichimura, M. Itoh, J. Kamiya, T. Kawabata, Y. Kitamura, E. Obayashi, H. Sakaguchi, N. Sakamoto, Y. Sakemi, Y. Shimizu, H. Takeda, M. Uchida, Y. Yasuda, H. P. Yoshida, M. Yosoi, Study of the pionic enhancement in 16O(p, p′) 16O(0-, T = 1) at 295 MeV, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/j.physletb.2005.11.009, 632, 4, 485-489, 2006.01, The cross section of the O16(p,p′)O16(0-,T=1) scattering was measured at a bombarding energy of 295 MeV in the momentum transfer range of 1.0fm-1≤qc.m.≤2.1fm-1. The isovector 0- state at Ex=12.8MeV is clearly separated from its neighboring states owing to the high energy resolution of about 30 keV. The cross section data were compared with distorted wave impulse approximation (DWIA) calculations employing shell-model wave functions. The observed cross sections around qc.m.≃1.7fm-1 are significantly larger than obtained by these calculations, suggesting pionic enhancement as a precursor of pion condensation in nuclei. The data are well reproduced by DWIA calculations using random phase approximation response functions including the Δ isobar that predict pionic enhancement..
161. S. Taniguchi, T. Moriya, M. Takada, K. Hatanaka, Tomotsugu Wakasa, T. Saito, Measurements of the response functions of a large size NE213 organic liquid scintillator for neutrons up to 800 MeV, Radiation Protection Dosimetry, 10.1093/rpd/nci042, 116, 1-4, 175-179, 2005.12, The response functions of 25.4 cm (length) × 25.4 cm (diameter) NE213 organic liquid scintillator have been measured for neutrons in the energy range from 20 to 800 MeV at the Heavy-Ion Medical Accelerator in Chiba (HIMAC) and at the Research Center for Nuclear Physics (RCNP) of Osaka University. At HIMAC, white (continuous) energy spectrum neutrons were produced by the 400 MeV per nucleon carbon ion bombardment on a thick graphite target, whose energy spectrum has already been measured by Kurosawa et al., [Nucl. Sci. Eng. 132, 30 (1999)] and the response functions of the time-of-flight-gated monoenergetic neutrons in a wide energy range from 20 to 800 MeV were simultaneously measured. At RCNP, the quasi-monoenergetic neutrons were produced via
7
Li(p,n)
7
Be reaction by 250 MeV proton beam bombardment on a thin
7
Li target, and the TOF-gated 245 MeV peak neutrons were measured. The absolute peak neutron yield was obtained by the measurement of 478 keV gamma rays from the
7
Be nuclei produced in a Li target. The measured results show that the response functions for monoenergetic neutrons <250 MeV have a recoil proton plateau and an edge around the maximum light output, which increases with increasing incident neutron energy, on the other hand >250 MeV, the plateau and the edge become unclear because the proton range becomes longer than the detector size and the escaping protons increase. It can be found that the efficiency of the 24.5 cm (diameter) × 25.4 cm (length) NE213 for the 250 MeV neutrons is ∼10 times larger than the 12.7 cm (length) × 12.7 cm (diameter) NE213, which is widely used as a neutron spectrometer..
162. T. Wakasa, M. Ichimura, H. Sakai, Unified analysis of spin isospin responses of nuclei, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.72.067303, 72, 6, 2005.12, We investigate the Gamow-Teller (GT) response functions at a momentum transfer of q=0fm-1 and the pionic response functions for quasielastic scattering (QES) at q 1.7fm-1 using the continuum random phase approximation with the π+ρ+g' model interaction. The Landau-Migdal (LM) parameters, gNN' and gNΔ', are estimated by comparing the calculations with recent experimental data. The peak of the GT resonance and the pionic response functions below the QES peak constrain gNN', whereas the quenching of the GT total strength and the enhanced pionic strength around the QES peak provide information about gNΔ'. We obtained gNN'=0.6±0.1 and gNΔ'=0.35±0.16 at q=0fm-1 and gNN'=0.7±0.1 and gNΔ'=0.3±0.1 at q 1.7fm-1. These results indicate that the q dependence of the LM parameters is weak..
163. K. Sekiguchi, H. Sakai, H. Witała, W. Glöckle, J. Golak, K. Hatanaka, M. Hatano, K. Itoh, H. Kamada, H. Kuboki, Y. Maeda, A. Nogga, H. Okamura, T. Saito, N. Sakamoto, Y. Sakemi, M. Sasano, Y. Shimizu, K. Suda, A. Tamii, T. Uesaka, T. Wakasa, K. Yako, Resolving the discrepancy of 135 MeV pd elastic scattering cross sections and relativistic effects, Physical Review Letters, 10.1103/PhysRevLett.95.162301, 95, 16, 2005.10, Three precise measurements for elastic pd scattering at 135MeV/A have been performed with the three different experimental setups. The cross sections are described well by the theoretical predictions based on modern nucleon-nucleon forces combined with three-nucleon forces. Relativistic Faddeev calculations show that relativistic effects are restricted to backward angles. This result supports the two measurements recently reported by RIKEN and contradicts the KVI data..
164. T. Wakasa, Y. Hagihara, M. Sasano, S. Asaji, Kunihiro Fujita, K. Hatanaka, T. Ishida, T. Kawabata, H. Kuboki, Y. Maeda, T. Noro, T. Saito, H. Sakai, Y. Sakemi, K. Sekiguchi, Y. Shimizu, A. Tamii, Y. Tameshige, K. Yako, Performance of the neutron polarimeter NPOL3 for high resolution measurements, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2005.03.151, 547, 2-3, 569-582, 2005.08, We describe the neutron polarimeter NPOL3 for the measurement of polarization transfer observables Dij with a typical high resolution of ∼300 keV at Tn≃200MeV. The NPOL3 system consists of three planes of neutron detectors. The first two planes for neutron polarization analysis are made of 20 sets of one-dimensional position-sensitive plastic scintillation counters with a size of 100 cm × 10 cm × 5 cm, and they cover the area of 100×100cm2. The last plane for detecting doubly scattered neutrons or recoiled protons is made of the two-dimensional position-sensitive liquid scintillation counter with a size of 100cm×100cm×10cm. The effective analyzing powers Ay;eff and double scattering efficiencies εD.S. were measured by using the three kinds of polarized neutrons from the 2H(p→,n→)pp, 6Li(p→,n→)6Be(g.s.), and 12C(p→,n→) 12N(g.s.) reactions at Tp=198MeV. The performance of NPOL3 defined as εD.S.(Ay;eff)2 are similar to that of the Indiana Neutron POLarimeter by taking into account for the counter configuration difference between these two neutron polarimeters..
165. K. Yako, H. Sakai, M. B. Greenfield, K. Hatanaka, M. Hatano, J. Kamiya, H. Kato, Y. Kitamura, Y. Maeda, C. L. Morris, H. Okamura, J. Rapaport, T. Saito, Y. Sakemi, K. Sekiguchi, Y. Shimizu, K. Suda, A. Tamii, N. Uchigashima, T. Wakasa, Determination of the Gamow-Teller quenching factor from charge exchange reactions on 90Zr, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/j.physletb.2005.04.032, 615, 3-4, 193-199, 2005.06, Double differential cross sections between 0°-12°were measured for the 90Zr(n, p) reaction at 293 MeV over a wide excitation energy range of 0-70 MeV. A multipole decomposition technique was applied to the present data as well as the previously obtained 90Zr(p, n) data to extract the Gamow-Teller (GT) component from the continuum. The GT quenching factor Q was derived by using the obtained total GT strengths. The result is Q=0.88±0.06, not including an overall normalization uncertainty in the GT unit cross section of 16%..
166. T. Kudoh, K. Sagara, T. Noro, T. Wakasa, T. Yagita, T. Ishida, S. Nozoe, S. Shimomoto, M. Shiota, H. Ohira, M. Tomiyama, K. Hatanaka, Y. Sakemi, A. Tamii, H. P. Yoshida, Y. Shimizu, Kunihiro Fujita, Y. Tameshige, H. Kuboki, New discrepancies in pd capture and pd breakup, FEW-BODY PROBLEMS IN PHYSICS: The 19th European Conference on Few-Body Problems in Physics FEW-BODY PROBLEMS IN PHYSICS The 19th European Conference on Few-Body Problems in Physics, 10.1063/1.1932874, 2005.05.
167. T. Noro, T. Yonemura, S. Asaji, N. S. Chant, Kunihiro Fujita, Y. Hagihara, K. Hatanaka, G. C. Hillhouse, T. Ishida, M. Itoh, S. Kishi, M. Nakamura, Y. Nagasue, H. Sakaguchi, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tamesige, S. Terashima, M. Uchida, T. Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi, Analyzing powers for exclusive 1s1/2 proton knockout from light nuclei, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.72.041602, 72, 4, 2005.01, Analyzing power data are reported for exclusive proton-induced proton knockout from the 1s1/2 states of 10 target nuclei ranging from H2 to F19 for an incident energy of 392 MeV. Compared to free proton-proton scattering, the data are significantly suppressed, the amount of suppression increasing monotonically as a function of increasing separation energies for the knocked-out protons. It is also possible to consider that this suppression increases monotonically as a function of the increasing effective mean density for most of the target nuclei, but data for He3 and He4 targets clearly deviate from such systematic change. The data are compared to model predictions based on the nonrelativistic and relativistic distorted-wave impulse approximation. Both relativistic plane wave model and a nonrelativistic distorted-wave model incorporating a relativistic correction associated with an effective nucleon mass predict a significant suppression of the analyzing power, but the magnitude of the suppression is not sufficient to explain the experimental data. However, a relativistic distorted wave model predicts values that are closer to the data, but the result is inconclusive in this work since recoil corrections are neglected..
168. M. Sasano, H. Sakai, K. Yako, T. Saito, H. Kuboki, Y. Takahasi, Tomotsugu Wakasa, S. Asaji, Y. Hagihara, K. Hatanaka, A. Tamii, Y. Sakemi, Y. Tameshige, Y. Shimizu, Kunihiro Fujita, Y. Fujita, H. Okamura, K. Sekiguchi, Y. Maeda, T. Kawabata, M. B. Greenfield, Determination of Gamow-Teller unit cross sections of the (p, n) reaction at 200 and 300 MeV, Journal of Physics: Conference Series, 10.1088/1742-6596/20/1/036, 20, 1, 181-182, 2005.01, The Gamow-Teller (GT) unit cross section, σ̌GT, is an essential quantity to deduce the GT transition strength, B(GT), from the (p, n) 0°cross section. (p, n) measurements at 200 and 300 MeV were performed using the Neutron Time-of-Flight (NTOF) facility at the Research Center for Nuclear Physics (RCNP). The σ̌GT values were determined, for the first time, for several nuclei in the region of A > 50 at E p = 200 and 300 MeV. A significant difference between the B(GT) values obtained by (p, n) and (3He, t) measurements was found..
169. Tomotsugu Wakasa, Spin isospin responses in nuclei and their unified understanding with Landau-Migdal parameters, Journal of Physics: Conference Series, 10.1088/1742-6596/20/1/004, 20, 1, 22-27, 2005.01, Both the Gamow-Teller (GT) and the pionic response functions are investigated in the same framework of the continuum random phase approximation with the π ρ + g′ model interaction. The Landau-Migdal (LM) parameters, g′NN and g′, are estimated by comparing these calculations with recent experimental data. The peak of the GT resonance and the pionic response functions below the quasielastic scattering (QES) peak constrain g′NN, whereas the quenching of the GT total strength and the enhanced pionic strength around the QES peak provide information about g′. We obtain a common set of the LM parameters, g′NN = 0.6-0.7 and g′ = 0.2-0.4, which reproduce the peak and quenching of the GT strengths as well as the enhancement of the pionic modes. The g′ value is significantly smaller than g′NN, which means that the universality ansatz, g′NN = g′, should not be valid..
170. T. Noro, S. Asaji, K. Fujita, Y. Hagihara, K. Hatanaka, T. Ishida, M. Ito, S. Kishi, Y. Nagasue, M. Nakamura, H. Sakaguchi, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tamashige, S. Terashima, M. Uchida, T. Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi, T. Yonemura, Study of single-particle properties of nuclei and in-medium NN interaction by using (p, 2p) reactions, Journal of Physics: Conference Series, 10.1088/1742-6596/20/1/017, 20, 1, 101-106, 2005.01, We report our experimental studies on (p, 2p) reactions from two kinds of view points, namely to investigate single particle properties of nuclei and to observe possible modification of NN interactions in nuclear field. Comparison of the cross section data with theoretical predictions and data of (e, e′p) reaction suggests that the reaction mechanizsm at incident energies of around 400 MeV is simple enough to extract spectroscopic information through the (p, 2p) reactions. In addition, some analyzing power data show anomaly which is not seen in cross section data and, therefore, which suggest importance of polarization studies. On the examination of the NN interaction, systematic study on analyzing powers for 1s1/2-proton knockout has been continued. A new systematics, a Q-value dependence the analyzing power was newly observed..
171. Y. Fujita, Y. Shimbara, T. Adachi, G. P.A. Berg, B. A. Brown, H. Fujita, K. Hatanaka, J. Kamiya, K. Nakanishi, Y. Sakemi, S. Sasaki, Y. Shimizu, Y. Tameshige, M. Uchida, T. Wakasa, M. Yosoi, Isospin symmetry of Tz = ± 3/2 → ±1/2 Gamow-Teller transitions in A=41 nuclei, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.70.054311, 70, 5, 54311, 2004.11, Under the assumption that isospin I is a good quantum number, isobaric analog states and various analogous transitions are expected in isobars with mass number A. The strengths of Tz=+3/2→+1/2 analogous Gamow-Teller (GT) transitions and analogous M1 transitions within the A=41 isobar quartet are compared in detail. The Tz= +3/2+1/2 GT transitions from the Jπ=3/2+ ground state of 41K leading to excited Jπ = 1/2+, 3/2 +, and 5/2+ states in 41Ca were measured using the (3He,t) charge-exchange reaction. With a high energy resolution of 35 keV, many fragmented states were observed, and the GT strength distribution was determined up to 10 MeV excitation energy (Ex). The main part of the strength was concentrated in the Ex =4-6 MeV region. A shell-model calculation could reproduce the concentration, but not so well details of the strength distribution. The obtained distribution was further compared with two results of 41Ti βdecay studying the analogous Tz=-3/2→-1/2 GT strengths. They reported contradicting distributions. One-to-one correspondences of analogous transitions and analog states were assigned up to Ex=6 MeV in the comparison with one of these 41Ti β-decay results. Combining the spectroscopic information of the analog states in 41Ca and 41 Sc, the most probable Jπ values were deduced for each pair of analog states. It was found that 5/2+ states carry the main part of the observed GT strength, while much less GT strength was carried by 1/2+ and 3/2+ states. The gross features of the GT strength distributions for each J were similar for the isospin analogous Tz=±3/ 2→±1/2 transitions, but the details were somewhat different. From the difference of the distributions, isospin-asymmetry matrix elements of ≈8 keV were deduced. The Coulomb displacement energy, which is sensitive to the configuration of states, showed a sudden increase of about 50 keV at the excitation energy of 3.8 MeV. The strengths of several Ml transitions to the IAS in 41Ca were compared with the strengths of analogous GT transitions. It was found that ratios of the M1 and GT transition strengths were similar, suggesting that the contributions of the lτ term in M1 transitions are small..
172. T. Kawabata, H. Akimune, H. Fujimura, H. Fujita, Y. Fujita, M. Fujiwara, K. Hara, K. Y. Hara, K. Hatanaka, T. Ishikawa, M. Itoh, J. Kamiya, M. Nakamura, H. Sakaguchi, Y. Shimbara, H. Takeda, A. Tamii, T. Noro, H. Toyokawa, M. Uchida, T. Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi, Weak isoscalar response of 11B, Physics of Atomic Nuclei, 67, 10, 1974-1798, 2004.10, Weak-interaction responses of 11B were studied by measuring the 11B(3He, t) and 11B(p, p′) reactions. Obtained nuclear transition matrix elements B(GT), B(στ), and B(σ) were compared with the shell-model calculations. The shell-model calculations, which explained the isovector parts B(GT) and B(στ) reasonably well if the quenching factors of 0.5-0.7 were taken into account, did not describe the isoscalar part B(σ)..
173. Tomotsugu Wakasa, Hideyuki Sakai, Hiroyuki Okamura, Hideaki Otsu, Takamasa Nonaka, Tetsuya Ohnishi, Kentaro Yako, Kimiko Sekiguchi, Satoshi Fujita, Tomohiro Uesaka, Yoshiteru Satou, Satoru Ishida, Naruhiko Sakamoto, Mark B. Greenfield, Kichiji Hatanaka, Total spin transfer in continuum for 90Zr(p, n) reaction at 295 MeV, journal of the physical society of japan, 10.1143/JPSJ.73.1611, 73, 7, 1611-1614, 2004.07, A complete set of polarization transfer observables has been measured for the 90Zr(p, n) reaction at Tp = 295 MeV and θlab = 0inverted c sign. The measurement can yield the total spin transfer Σ(0inverted c sign) which is independent of nuclear reaction mechanisms such as the effective nucleon-nucleon interaction or distortions. The deduced Σ(0inverted c sign) values indicate the strong spin-flip characteristics of the continuum up to 50 MeV excitation. A predominance of unnatural-parity transitions in the continuum is also observed from polarization transfer observables..
174. T. Wakasa, H. Sakai, M. Ichimura, K. Hatanaka, M. B. Greenfield, M. Hatano, J. Kamiya, H. Kato, Y. Maeda, H. Okamura, T. Ohnishi, H. Otsu, K. Sekiguchi, K. Suda, A. Tamil, T. Uesaka, T. Yagita, K. Yako, Polarization transfer and spin response functions of the 2H(p→,n→) reaction at 345 MeV, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.69.044602, 69, 4, 44602-44601, 2004.04, Differential cross sections and a complete set of polarization observables have been measured in the quasielastic 2H(p,n) reaction at a bombarding energy of 345 MeV and laboratory scattering angles of 16°, 22°, and 27°. The data are compared with plane-wave impulse approximation calculations employing an optimal factorization approximation. The agreement between the experimental and theoretical results validates these approximations in the present momentum- and energy-transfer regions. The experimental spin-longitudinal and spin-transverse response functions, R L and RT, respectively, are deduced from the data. The obtained RT is consistent with that obtained from the quasielastic electron scattering. The theoretical calculations with the Reid soft core potential give good descriptions for RL and RT, whereas the latter is slightly underestimated around the quasielastic peak..
175. Y. Shimbara, Y. Fujita, M. Hamaguchi, E. Mochizuki, T. Adachi, G. P.A. Berg, H. Fujimura, H. Fujita, Kunihiro Fujita, K. Hara, K. Hatanaka, J. Kamiya, K. Kawase, T. Kawabata, Y. Kitamura, K. Nakanishi, N. Sakamoto, Y. Sakemi, Y. Shimizu, Y. Tameshige, M. Uchida, Tomotsugu Wakasa, K. Yamasaki, M. Yoshifuku, M. Yosoi, Versatile production method of thin targets supported by PVA, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2003.12.002, 522, 3, 205-211, 2004.04, Thin self-supporting targets are indispensable in high energy-resolution studies using a magnetic spectrometer. However, nuclear targets of alkaline and alkaline-earth metal or halogen isotopes are not easily available. In order to produce thin target foils of these elements for the use in charge-exchange reactions, we take advantage of the fact that the stable isotopes of these elements have relatively small negative Q values, while 12C and 16O have large negative Q values. Therefore, even if organic compounds containing carbon and oxygen are used as supporting material, clean spectra on alkaline and alkaline-earth metal or halogen targets can be obtained up to the excitation energies of Q-value differences. A technique to produce thin foils of the chemical compounds Na2CO3,K 2CO3,CaCO3 and CaCl2 was developed using polyvinylalcohol as supporting material. Foils with a total thickness of 1-2 mg/cm2 were produced and used as targets in a (3He,t) reaction study at an incident energy of 420 MeV. Owing to the small contributions of energy-loss differences of beam and reaction products in such thin targets, a very good resolution of ΔE/E=7×10-5 was achieved in combination with a high-resolution magnetic spectrometer..
176. Y. Fujita, I. Hamamoto, H. Fujita, Y. Shimbara, T. Adachi, G. P.A. Berg, K. Fujita, K. Hatanaka, J. Kamiya, K. Nakanishi, Y. Sakemi, Y. Shimizu, M. Uchida, T. Wakasa, M. Yosoi, Evidence for the Existence of the [2 0 2]3/2 Deformed Band in Mirror Nuclei 25Mg and 25Al, Physical Review Letters, 92, 6, 625021-625024, 2004.02, The existence of highest-lying [2 0 2]3/2 orbit among the six Nilsson particle orbits in prolately deformed nuclie was identified along with the rotational band on this orbit. The band members were investigated in 25Al at excitation energies of 6-7.5 MeV in a high resolution 25Mg(3He,t) charge exchange reaction. The comparison of excitation energies with the analogous M1 transitions in 25Mg depicted that the bandhead and the excited members are clearly assigned. The results showed that the bandhead state of the orbit was observed at E x = 6.117 Mev in 25Al by the charge-exchange reaction..
177. Sakamoto N, Okamura H, Uesaka T, Ishida S, Otsu H, Wakasa T, Satou Y, Niizeki T, Katoh K, Yamashita T, Hatanaka K, Koike Y, Sakai H, Measurement of the vector and tensor analyzing powers for the d-p elastic scattering at E(d)=270 MeV, PHYSICS LETTERS B, 367 (1-4): 60-64 JAN 18 1996, 2004.01.
178. Y. Fujita, I. Hamamoto, H. Fujita, Y. Shimbara, T. Adachi, G. P.A. Berg, Kunihiro Fujita, K. Hatanaka, J. Kamiya, K. Nakanishi, Y. Sakemi, Y. Shimizu, M. Uchida, T. Wakasa, M. Yosoi, Evidence for the Existence of the [Formula presented] Deformed Band in Mirror Nuclei [Formula presented] and [Formula presented], Physical Review Letters, 10.1103/PhysRevLett.92.062502, 92, 6, 2004.01, After 50 years of its prediction, the highest-lying [Formula presented] orbit among the six Nilsson single-particle orbits originating from the [Formula presented] shells in prolately deformed nuclei and the rotational band on this orbit were identified. The band members were observed in [Formula presented] at excitation energies of 6–7.5 MeV in a high-resolution [Formula presented] charge-exchange reaction at [Formula presented] having a strong selectivity for Gamow-Teller transitions. In the comparison with the analogous [Formula presented] transitions in [Formula presented], the [Formula presented] bandhead state and the excited [Formula presented] and [Formula presented] members were clearly assigned..
179. T. Kawabata, H. Akimune, H. Fujimura, H. Fujita, Y. Fujita, M. Fujiwara, K. Hara, K. Y. Hara, K. Hatanaka, T. Ishikawa, M. Itoh, J. Kamiya, S. Kishi, M. Nakmura, K. Nakanishi, Tetsuo Noro, H. Sakaguchi, Y. Shimbara, H. Takeda, A. Tamii, S. Terashima, H. Toyokawa, M. Uchida, H. Ueno, Tomotsugu Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi, Isovector and isoscalar spin-flip M1 strengths in11B, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.70.034318, 70, 3, 343181-3431810, 2004.01, The 11B(3He,t), and 11B(d,d′), and 11B(p,p′) reactions were measured at forward scattering angles including 0° to study the isovector and isoscalar spin-flip M1 strengths in 11B. The measured 11B(3He,t) cross sections were compared with the results of the distorted-wave impulse-approximation (DWIA) calculation, and the Gamow-Teller (GT) strengths for low-lying states in 11C were determined. The GT strengths were converted to the isovector spin-flip M1 strengths using the isobaric analog relations under the assumption of the isospin symmetry. The isoscalar spin-flip M1 strengths were obtained from the (d,d′) analysis by assuming that the shape of the collective transition form factor with the same ΔJπ is similar in the 11B(d,d′) and 12C(d,d′) reactions. The obtained isovector and isoscalar strengths were used in the DWIA calculations for the 11B(p,p′) reaction. The DWIA calculation reasonably well explains the present 11B(p,p′) result. However, the calculated cross section for the 8.92-MeV 3/22-, state was significantly smaller than the experimental values. The transition strengths obtained in the shell-model calculations were found to be 20-50 % larger than the experimental strengths. The transition strengths for the neutrino induced reactions were estimated by using the isovector and isoscalar spin-flip Ml strengths. The present results are quantitatively in agreement with the theoretical estimation discussing the axial isoscalar coupling in the neutrino scattering process, and are useful in the measurement of the stellar neutrinos using the neutral- and charged-current reactions on 11B..
180. Tomotsugu Wakasa, H. Sakai, M. Ichimura, K. Hatanaka, M. B. Greenfield, M. Hatano, J. Kamiya, H. Kato, K. Kawahigashi, Y. Maeda, Y. Nakaoka, H. Okamura, T. Ohnishi, H. Otsu, K. Sekiguchi, K. Suda, A. Tamii, T. Uesaka, T. Yagita, K. Yako, Pionic enhancement in quasielastic (p,n) reactions at 345 MeV, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.69.054609, 69, 5, 2004.01, Differential cross sections and a complete set of polarization observables have been measured for quasielastic (p,n) reactions on 12C and 40Ca at a bombarding energy of 345 MeV. The laboratory momentum transfers are qlab ≃ 1.2, 1.7, and 2.0 fm-1 for 12C and qlab≃ 1.7 fm -1 for 40Ca. In these momentum transfer regions, the isovector spin-longitudinal interaction is attractive where the one-pion exchange is dominant. The spin-longitudinal and spin-transverse polarized cross sections, IDq and IDp, are deduced. The theoretically expected enhancement in the spin-longitudinal mode is observed at q lab≃1.7 and 2.0 fm-1. The observed IDq is consistent with the pionic enhanced IDq evaluated in distorted wave impulse approximation (DWIA) calculations employing random phase approximation (RPA) response functions. The enhanced IDq implies the existence of a precursor to pion condensation in nuclei. On the other hand, the theoretically predicted quenching in the spin-transverse mode is not observed. The observed IDp is not quenched, but rather enhanced relative to that predicted via the DWIA+RPA calculations. Two-step contributions are responsible in part for the enhancement of IDp..
181. K. Sekiguchi, H. Sakai, H. Witała, K. Ermisch, W. Glöckle, J. Golak, M. Hatano, H. Kamada, N. Kalantar-Nayestanaki, H. Kato, Y. Maeda, J. Nishikawa, A. Nogga, T. Ohnishi, H. Okamura, T. Saito, N. Sakamoto, S. Sakoda, Y. Satou, K. Suda, A. Tamii, T. Uchigashima, T. Uesaka, Tomotsugu Wakasa, K. Yako, Polarization transfer measurement for
1
H(d→,p→)
2
H elastic scattering at 135 MeV/nucleon and three-nucleon force effects, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.70.014001, 70, 1, 2004.01, The deuteron-to-proton polarization-transfer coefficients for d-p elastic scattering were precisely measured with an incoming deuteron energy of 135 MeV/nucleon at the RIKEN Accelerator Research Facility. The data are compared to theoretical predictions based on exact solutions of the three-nucleon Faddeev equations with high-precision nucleon-nucleon forces combined with the current, most popular three-nucleon force (3NF) models: the 2π-exchange Tucson-Melbourne model, a modification thereof based on chiral symmetry, TM'(99), and the Urbana IX 3NF. Theory predicts large 3NF effects, especially in the angular range around the cross section minimum, predominantly for K
xx
y′
-K
yy
y′
(K
xx
y′
,K
yy
y′
), but the present data only partially concurs with the calculations. For the induced polarization, P
y′
, the TM′(99) and Urbana IX 3NFs reproduce the data, but the Tucson-Melbourne 3NF fails to describe the data. For the polarization-transfer coefficients, K
y
y′
and K
xz
y′
, the predicted 3NF effects are in drastic disagreement with the data. These facts clearly reveal the defects of the 3NF models currently used..
182. V. A. Andreev, M. N. Andronenko, G. M. Amalsky, S. L. Belostotski, O. A. Domchenkov, O. Ya Fedorov, K. Hatanaka, A. A. Izotov, A. A. Jgoun, J. Kamiya, A. Yu Kisselev, M. A. Kopytin, O. V. Miklukho, Yu G. Naryshkin, Tetsuo Noro, E. Obayashi, A. N. Prokofiev, D. A. Prokofiev, H. Sakaguchi, V. V. Sulimov, A. V. Shvedchikov, H. Takeda, S. I. Trush, V. V. Vikhrov, Tomotsugu Wakasa, Y. Yasuda, H. P. Yoshida, A. Zhdanov, Polarizations for proton knockout reactions from s1/2 orbits at 1 GeV, Physical Review C - Nuclear Physics, 69, 2, 246041-246047, 2004.01, The polarization of protons emitted in (p,2p) reactions has been measured for three kinds of targets at 1 GeV. The values of the polarization that we obtain are significantly smaller than the values predicted using the nucleon-nucleon (NN) interaction in free space, and the discrepancy between the two is seen to increase monotonically as a function of the effective mean density, which is defined as a measure of the sensitivity of a reaction to density-dependent terms of the interaction. The experimental data are also compared with a model calculation that includes a relativistic effect, and it is found that inclusion of this effect is able to account for about half of the density-dependent discrepancy between the experimental results and the values predicted with the free space NN interaction. These results, in conjunction with the previous results at 392 MeV, indicate that this discrepancy is not caused by a contribution of multistep processes and provide further evidence that there exists a medium effect..
183. V. A. Andreev, M. N. Andronenko, G. M. Amalsky, S. L. Belostotski, O. A. Domchenkov, O. Ya Fedorov, K. Hatanaka, A. A. Izotov, A. A. Jgoun, J. Kamiya, A. Yu Kisselev, M. A. Kopytin, O. V. Miklukho, Yu G. Naryshkin, T. Noro, E. Obayashi, A. N. Prokofiev, D. A. Prokofiev, H. Sakaguchi, V. V. Sulimov, A. V. Shvedchikov, H. Takeda, S. I. Trush, V. V. Vikhrov, Tomotsugu Wakasa, Y. Yasuda, H. P. Yoshida, A. Zhdanov, Polarizations for proton knockout reactions from [Formula Presented] orbits at [Formula Presented], Physical Review C - Nuclear Physics, 10.1103/PhysRevC.69.024604, 69, 2, 2004.01, The polarization of protons emitted in [Formula Presented] reactions has been measured for three kinds of targets at [Formula Presented]. The values of the polarization that we obtain are significantly smaller than the values predicted using the nucleon-nucleon (NN) interaction in free space, and the discrepancy between the two is seen to increase monotonically as a function of the effective mean density, which is defined as a measure of the sensitivity of a reaction to density-dependent terms of the interaction. The experimental data are also compared with a model calculation that includes a relativistic effect, and it is found that inclusion of this effect is able to account for about half of the density-dependent discrepancy between the experimental results and the values predicted with the free space NN interaction. These results, in conjunction with the previous results at [Formula Presented], indicate that this discrepancy is not caused by a contribution of multistep processes and provide further evidence that there exists a medium effect..
184. Y. Shimbara, Y. Fujita, T. Adachi, G. P.A. Berg, H. Fujita, Kunihiro Fujita, I. Hamamoto, K. Hatanaka, J. Kamiya, K. Nakanishi, Y. Sakemi, Y. Shimizu, M. Uchida, T. Wakasa, M. Yosoi, Suppression of Gamow-Teller and M1 transitions in deformed mirror nuclei 25Mg and 25Al
Direct observation of K selection rules, European Physical Journal A, 10.1140/epja/i2003-10115-2, 19, 1, 25-31, 2004.01, The mirror nuclei 25Mg and 25Al are expected to have very similar structures. The Gamow-Teller (GT) transitions from the J π = 5/2+ ground state of 25Mg to the excited states in 25Al were studied by high-resolution measurements of the 25Mg(3He, t) charge-exchange reaction at 0 ° and at 140 MeV/nucleon. Assuming the usual ΔJ π = 1+ selection rule for the spin-isospin-type GT transitions, the states with Jπ = 3/2+, 5/2 +, and 7/2+ should be excited. However, of the more than ten states with these Jπ values below 6 MeV excitation energy, only the 5/2+ ground state and the 7/2+, 1.613 MeV state in 25Al were strongly populated, while all other states were strongly suppressed. The analysis of Ml transitions in 25Mg also suggested a very similar feature for the analogous M1 transitions. Both 25Mg and 25Al are known to be largely deformed, and most low-lying states can be interpreted in terms of one-particle quantum numbers in the deformed potential and the associated rotational spectra. The observed suppression can be explained in terms of the K quantum number selection rules that are inherent to axially deformed nuclei..
185. Hatanaka K, Kamiya J, Maeda Y, Noro T, Sagara K, Sakai H, Sakemi Y, Sekiguchi K, Shimizu Y, Tamii A, Wakasa T, Yako K, Yoshida HP, Ladygin VP, pd scattering at 250 MeV and three-nucleon forces, EUROPEAN PHYSICAL JOURNAL A, 10.1140/epja/i2002-10219-1, 18, 2-3, 293-296, 18 (2-3): 293-296 NOV 2003, 2003.11.
186. Kamiya J, Hatanaka K, Adachi T, Fujita K, Hara K, Kawabata T, Noro T, Sakaguchi H, Sakamoto N, Sakemi Y, Shimbara Y, Shimizu Y, Terashima S, Uchida M, Wakasa T, Yasuda Y, Yoshida HP, Yosoi M, Calibration of the effective analyzing power for a He-3 polarimeter at 443 MeV, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 10.1016/S0168-9002(03)01436-0, 507, 3, 703-711, 507 (3): 703-711 JUL 21 2003, 2003.07.
187. G. P.A. Berg, K. Hatanaka, M. Wiescher, H. Schatz, T. Adachi, A. D. Bacher, C. C. Foster, Y. Fujita, H. Fujita, Kunihiro Fujita, J. Görres, Ch Herman, J. Kamiya, N. Sakamoto, Y. Sakemi, Y. Shimbara, Y. Shimuzu, E. J. Stephenson, Tomotsugu Wakasa, M. Yosoi, Resonance states in 22Mg for reaction rates in the rp-process, Nuclear Physics A, 10.1016/S0375-9474(03)00900-X, 723, 1-2, 2003.07, Motivated by the need of spectroscopic data to better understand the astrophysical rp-process, we developed a new experimental method using the Grand Raiden magnet spectrometer to study proton rich nuclei with α and 3He induced reactions. First results of the 24Mg(4He,6He)22Mg reaction at 206 MeV and O° are presented, showing states relevant for resonant reaction rate calculations of the proton capture 21Na(p,γ)22Mg and the 18Ne(α,p)21 Na reaction which controls the break-out of the hot CNO cycles at X-ray burst conditions..
188. Kamiya J, Hatanaka K, Adachi T, Fujita K, Hara K, Kawabata T, Noro T, Sakaguchi H, Sakamoto N, Sakemi Y, Shimbara Y, Shimizu Y, Terashima S, Uchida M, Wakasa T, Yasuda Y, Yoshida HP, Yosoi M, Cross section and induced polarization in He-3 elastic scattering at 443 MeV, PHYSICAL REVIEW C, 10.1103/PhysRevC.67.064612, 67, 6, 67 (6): art. no. 064612 JUN 2003, 2003.06.
189. Wakasa T, Berg GPA, Fujita H, Fujita Y, Hatanaka K, Hara K, Itoh M, Kamiya J, Kawabata T, Nagayama K, Noro T, Sakaguchi H, Shimbara Y, Shinada Y, Takeda H, Tamura K, Ueno H, Uchida M, Uraki M, Yosoi M, New capabilities of the Grand Raiden spectrometer, NUCLEAR PHYSICS A, 10.1016/S0375-9474(03)01294-6, 721, 1099C-1102C, 721: 1099C-1102C JUN 30 2003, 2003.06.
190. Sekiguchi K, Sakai H, Okamura H, Tamii A, Uesaka T, Suda K, Sakamoto N, Wakasa T, Satou Y, Ohnishi T, Yako K, Sakoda S, Suda K, Kato H, Maeda Y, Hatano M, Nishikawa J, Saito T, Uchigashima N, Kalantar-Nayestanaki N, Ermisch K, Polarization transfer measurement for d-p scattering and three nucleon force effects, NUCLEAR PHYSICS A, 721: 637C-640C JUN 30 2003, 2003.06.
191. Tamii A, Hatanaka K, Hatano M, Hirooka D, Kamiya J, Kato H, Maeda Y, Saito T, Sakai H, Sakoda S, Sekiguchi K, Uchigashima N, Wakasa T, Yako K, Search for narrow dibaryon resonances by the pd -> pdX and pd -> ppX reactions, NUCLEAR PHYSICS A, 721: 621C-624C JUN 30 2003, 2003.06.
192. K. Sekiguchi, H. Sakai, H. Okamura, A. Tamii, T. Uesaka, K. Suda, N. Sakamoto, T. Wakasa, Y. Satou, T. Ohnishi, K. Yako, S. Sakoda, K. Suda, H. Kato, Y. Maeda, M. Hatano, J. Nishikawa, T. Saito, N. Uchigashima, N. Kalantar-Nayestanaki, K. Ermisch, Polarization transfer measurement for d-p scattering and three nucleon force effects, Nuclear Physics A, 10.1016/S0375-9474(03)01141-2, 721, C637-C640, 2003.06, Precise measurements of the deuteron to proton polarization transfer coefficients for the d-p elastic scattering has been made at 135 MeV/u at RIKEN Accelerator Research Facility. The obtained results are compared with the Faddeev calculations based on modern nucleon-nucleon forces together with Tucson-Melbourne, Tucson-Melbourne' and Urbana-Argonne type of three nucleon forces..
193. A. Tamii, K. Hatanaka, M. Hatano, D. Hirooka, J. Kamiya, H. Kato, Y. Maeda, T. Saito, H. Sakai, S. Sakoda, K. Sekiguchi, N. Uchigashima, T. Wakasa, K. Yako, Search for narrow dibaryon resonances by the pd → pdX and pd → ppX reactions, Nuclear Physics A, 10.1016/S0375-9474(03)01137-0, 721, C621-C624, 2003.06, Dibaryons which have a very narrow decay width, called super-narrow dibaryons, are searched for by the p+d scattering at Ep = 295 MeV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A good mass resolution of 0.95 MeV and background free condition have been achieved. No resonance has been observed in the mass region of 1896-1914 MeV. The upper limits of the dibaryon production cross section have been determined..
194. Berg GPA, Hatanaka K, Wiescher M, Schatz H, Adachi T, Bacher AD, Foster CC, Fujita Y, Fujita H, Fujita K, Gorres J, Herman C, Kamiya J, Sakamoto N, Sakemi Y, Shimbara Y, Shimizu Y, Stephenson EJ, Wakasa T, Yosoi M, Resonance states in Mg-22 for reaction rates in the rp-process, NUCLEAR PHYSICS A, 718: 608C-610C MAY 5 2003, 2003.05.
195. Maeda Y, Sakai H, Tami A, Sakoda S, Kato H, Hatano M, Saito T, Uchigashima N, Kuboki H, Hatanaka K, Hirooka D, Shimizu Y, Kitamura Y, Fujita K, Sakamoto N, Okamura H, Suda K, Ikeda T, Itoh K, Sakemi Y, Wakasa T, Kamiya J, Yako K, Sekiguchi K, Sato Y, Gree, Measurement of differential cross sections and vector analyzing powers for the (n)over-right-arrowd reaction at 250MeV, MODERN PHYSICS LETTERS A, 18 (2-6): 298-301 FEB 28 2003, 2003.02.
196. Tamii A, Uchigashima N, Sakai H, Hatano M, Maeda Y, Saito T, Ishida T, Kuboki H, Hatanaka K, Wakasa T, Kamiya J, Shimizu Y, Kitamura Y, Okamura H, Suda K, Yako K, Sekiguchi K, Satou Y, Measurement of p+d elastic scattering at E-p=392 MeV, MODERN PHYSICS LETTERS A, 18 (2-6): 440-443 FEB 28 2003, 2003.02.
197. Sekiguchi K, Sakai H, Okamura H, Tamii A, Uesaka T, Suda K, Sakamoto N, Wakasa T, Satou Y, Ohnishi T, Yako K, Sakoda S, Kato H, Maeda Y, Hatano M, Nishikawa J, Saito T, Uchigashima N, Kalantar-Nayestanaki N, Ermisch K, Polarization transfer measurement for d-p elastic scattering: to search for three nucleon force effects, MODERN PHYSICS LETTERS A, 18 (2-6): 327-329 FEB 28 2003, 2003.02.
198. Tamii A, Hatano M, Kato H, Maeda Y, Saito T, Sakai H, Sakoda S, Uchigashima N, Hatanaka K, Hirooka D, Kamiya J, Wakasa T, Yako K, Sekiguchi K, Uesaka T, Search for super-narrow dibaryon resonances by the pd -> pdX and pd -> ppX reactions, MODERN PHYSICS LETTERS A, 18 (2-6): 410-413 FEB 28 2003, 2003.02.
199. Yagita T, Sagara K, Ishida T, Minami S, Tsuruta K, Noro T, Kamiya J, Wakasa T, Yoshida H, Yoshimura M, Hatanaka K, Akiyoshi H, Tensor anomaly in pd radiative capture, MODERN PHYSICS LETTERS A, 10.1142/S0217732303010430, 18, 2-6, 322-326, 18 (2-6): 322-326 FEB 28 2003, 2003.02.
200. Shimizu Y, Hatanaka K, Sakemi Y, Wakasa T, Yoshida HP, Kamiya J, Saito T, Sakai H, Tamii A, Sekiguchi K, Yako K, Maeda Y, Noro T, Sagara K, Ladygin VP, Three-body effects in (p)over-right-arrowd elastic scattering at 250 MeV, MODERN PHYSICS LETTERS A, 10.1142/S0217732303010417, 18, 2-6, 313-316, 18 (2-6): 313-316 FEB 28 2003, 2003.02.
201. Y. Maeda, H. Sakai, A. Tamii, S. Sakoda, H. Kato, M. Hatano, T. Saito, N. Uchigashima, H. Kuboki, K. Hatanaka, D. Hirooka, Y. Shimizu, Y. Kitamura, Kunihiro Fujita, N. Sakamoto, H. Okamura, K. Suda, T. Ikeda, K. Itoh, Y. Sakemi, Tomotsugu Wakasa, J. Kamiya, K. Yako, K. Sekiguchi, Y. Sato, M. B. Greenfield, J. Rapaport, H. Kamada, Measurement of differential cross sections and vector analyzing powers for the n

d reaction at 250MEV, Modern Physics Letters A, 10.1142/S0217732303010387, 18, 2-6, 298-301, 2003.02, To study the three-nucleon force (3NF) effects without ambiguities from the Coulomb effect, the differential cross sections and the vector analyzing powers for the n

d elastic scattering at E
n
= 245 MeV have been measured at θ
cm
= 85° - 180°. The data are compared to the results of Faddeev calculations using modern nucleon-nucleon (NN) forces with and without 3NF. Additionally we have a plan to extend our measurement to the forward angular region where the Coulomb effect is expected to be large. We carried out the test experiment and measured the differential cross sections at θ
cm
= 21°..
202. A. Tamii, N. Uchigashima, H. Sakai, M. Hatano, Y. Maeda, T. Saito, T. Ishida, H. Kuboki, K. Hatanaka, Tomotsugu Wakasa, J. Kamiya, Y. Shimizu, Y. Kitamura, H. Okamura, K. Suda, K. Yako, K. Sekiguchi, Y. Satou, Measurement of p+d elastic scattering at Ep=392 MeV, Modern Physics Letters A, 10.1142/S0217732303010648, 18, 2-6, 440-443, 2003.02, The cross sections and spin observables of the p+d elastic scattering have been measured at 392 MeV. The results are compared with the results of Faddeev calculations with and without including the three nucleon force..
203. K. Sekiguchi, H. Sakai, H. Okamura, A. Tamii, T. Uesaka, K. Suda, N. Sakamoto, T. Wakasa, Y. Satou, T. Ohnishi, K. Yako, S. Sakoda, H. Kato, Y. Maeda, M. Hatano, J. Nishikawa, T. Saito, N. Uchigashima, N. Kalantar-Nayestanaki, K. Ermisch, Polarization transfer measurement for d-p elastic scattering
To search for three nucleon force effects, Modern Physics Letters A, 10.1142/S0217732303010442, 18, 2-6, 327-329, 2003.02, Precise measurements of the deuteron to proton polarization transfer coefficients for the d-p elastic scattering have been made at 135 MeV/u at RIKEN Accelerator Research Facility. The obtained results are compared with the Faddeev calculations based on modern nucleon-nucleon forces together with Tucson-Melbourne, Tucson-Melbourne and Urbana-Argonne type of three nucleon forces..
204. A. Tamii, M. Hatano, H. Kato, Y. Maeda, T. Saito, H. Sakai, S. Sakoda, N. Uchigashima, K. Hatanaka, D. Hirooka, J. Kamiya, T. Wakasa, K. Yako, K. Sekiguchi, T. Uesaka, Search for super-narrow dibaryon resonances by the pd →, pdX and pd → ppX reactions, Modern Physics Letters A, 10.1142/S0217732303010582, 18, 2-6, 410-413, 2003.02, Dibaryons which have a very narrow decay width, called super-narrow dibaryons, are searched for by the p+d scattering at Ep = 295 MeV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A good mass resolution of 0.95 MeV and background free condition have been achieved. No resonance has been observed in the mass region of 1896-1914 MeV. The upper limits of the dibaryon production cross section have been determined..
205. J. Kamiya, K. Hatanaka, T. Adachi, Kunihiro Fujita, K. Hara, T. Kawabata, T. Noro, H. Sakaguchi, N. Sakamoto, Y. Sakemi, Y. Shimbara, Y. Shimizu, S. Terashima, M. Uchida, Tomotsugu Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi, Cross section and induced polarization in 3He elastic scattering at 443 MeV, Physical Review C - Nuclear Physics, 67, 6, 646121-6461211, 2003.01, Angular distributions of the differential cross section and the induced polarization of 3He elastic scattering on 12C, 58Ni, and 90Zr targets were measured at 443 MeV incident energy. This is the first measurement of 3He spin observables at intermediate energies. Cross sections and polarizations were measured in the range of center-of-mass angles of 5°-30° and 5°-20°, respectively. The polarization was measured with the focal plane polarimeter system of the Grand Raiden spectrometer, which was calibrated for 3He at the present energy. The optical potential parameters including the spin-orbit term were determined by a systematic search procedure. The diffuseness parameter of the spin-orbit potential was about 0.6-0.8 fm in contrast to much smaller values of 0.2-0.3 fm reported at lower energies. The energy dependence of the reduced volume integrals of the optical potential was found to be similar to that observed for protons at intermediate energies, but the real potential terms were smaller. Single folding (SF) model calculations were performed and compared with the experimental data. We found that the renormalization factors used to modify the SF potential were necessary in order to obtain a good fit to the data. These results call for an appropriate density dependent nucleon-nucleus interaction in the 3He nucleus..
206. Satou Y, Ishida S, Sakai H, Okamura H, Sakamoto N, Otsu H, Uesaka T, Tamii A, Wakasa T, Ohnishi T, Sekiguchi K, Yako K, Suda K, Hatano M, Kato H, Maeda Y, Nishikawa J, Ichihara T, Niizeki T, Kamada H, Glockle W, Witala H, Three body dN interaction in the analysis of the C-12((d)over-right-arrow, d ') reaction at 270 MeV, PHYSICS LETTERS B, 549 (3-4): 307-313 DEC 5 2002, 2002.12.
207. Y. Satou, S. Ishida, H. Sakai, H. Okamura, N. Sakamoto, H. Otsu, T. Uesaka, A. Tamii, T. Wakasa, T. Ohnishi, K. Sekiguchi, K. Yako, K. Suda, M. Hatano, H. Kato, Y. Maeda, J. Nishikawa, T. Ichihara, T. Niizeki, H. Kamada, W. Glöckle, H. Witała, Three-body dN interaction in the analysis of the 12C(d, d′) reaction at 270 MeV, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/S0370-2693(02)02957-X, 549, 3-4, 307-313, 2002.12, We have measured the cross sections and analyzing powers Ay and Ayy for the elastic and inelastic scattering of deuterons from the 0+(g.s.), 2+(4.44 MeV), 3-(9.64 MeV), 1+(12.71 MeV), and 2-(18.3 MeV) states in 12C at an incident energy of 270 MeV. The data are compared with microscopic distorted-wave impulse approximation calculations where the projectile-nucleon effective interaction is taken from the three-nucleon t-matrix given by rigorous Faddeev calculations presently available at intermediate energies. The agreement between theory and data compares well with that for the (p, p′) reactions at comparable incident energies/nucleon..
208. Hatanaka K, Shimizu Y, Hirooka D, Kamiya J, Kitamura Y, Maeda Y, Noro T, Obayashi E, Sagara K, Saito T, Sakai H, Sakemi Y, Sekiguchi K, Tamii A, Wakasa T, Yagita T, Yako K, Yoshida HP, Ladygin VP, Kamada H, Glockle W, Golak J, Nogga A, Witala H, Cross section and complete set of proton spin observables in (p)over-right-arrow-d elastic scattering at 250 MeV, PHYSICAL REVIEW C, 10.1103/PhysRevC.66.044002, 66, 4, 66 (4): art. no. 044002 OCT 2002, 2002.10.
209. T. Wakasa, Y. Sakemi, M. Uraki, K. Nagayama, K. Hatanaka, Control system for the two-arm spectrometer system at RCNP, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/S0168-9002(02)00899-9, 489, 1-3, 379-388, 2002.08, We have designed and constructed a new control system for the two-arm spectrometers and West-South (WS) beam line at RCNP. The system controls not only the magnets of the spectrometers but also movable devices such as slits. All the instruments are controlled by the system through a local area network. For the dipole magnets of the spectrometers, a high-performance feedback system based on a proportional-integral-differential algorithm was implemented. We have succeeded to change and stabilize the magnetic fields within ±0.05 mT in about 5 min and within about ±0.02 mT after 10 min. The performance of the feedback system satisfies the requirement for the high-resolution experiments with the Grand Raiden spectrometer by using the dispersive beam from the WS beam line..
210. Kawabata T, Ishikawa T, Itoh M, Nakamura M, Sakaguchi H, Takeda H, Taki T, Uchida M, Yasuda Y, Yosoi M, Akimune H, Yamasaki K, Berg GPA, Fujimura H, Hara K, Hatanaka K, Kamiya J, Noro T, Obayashi E, Wakasa T, Yoshida HP, Brown BA, Fujita H, Fujita Y, Shim, Polarization transfer in the O-16(p,p ') reaction at forward angles and structure of the spin-dipole resonances, PHYSICAL REVIEW C, 65 (6): art. no. 064316 JUN 2002, 2002.06.
211. Takahiro Kawabata, T. Ishikawa, M. Itoh, M. Nakamura, H. Sakaguchi, H. Takeda, T. Taki, M. Uchida, Y. Yasuda, M. Yosoi, H. Akimune, K. Yamasaki, G. P.A. Berg, H. Fujimura, K. Hara, K. Hatanaka, J. Kamiya, T. Noro, E. Obayashi, T. Wakasa, H. P. Yoshida, B. A. Brown, H. Fujita, Y. Fujita, Y. Shimbara, H. Ueno, M. Fujiwara, K. Hosono, A. Tamii, H. Toyokawa, Polarization transfer in the 16O(p,p′) reaction at forward angles and structure of the spin-dipole resonances, Physical Review C - Nuclear Physics, 65, 6, 643161-6431612, 2002.06, Cross Sections and polarization transfer observables in the 16O(p,p′) reactions at 392 MeV were measured at several angles between θlab =0° and 14°. The non-spin-flip (ΔS = 0) and spin-flip (ΔS = 1) strengths in transitions to several discrete States and broad resonances in 16O were extracted using a model-independent method. The giant resonances in the energy region of Ex = 19-27 MeV were found to be predominantly excited by ΔL = 1 transitions. The strength distribution of spin-dipole transitions with ΔS = 1 and ΔL = 1 were deduced. The obtained distribution was compared with a recent shell model calculation. Experimental results are reasonably explained by distorted-wave impulse-approximation calculations with the shell model wave functions..
212. Uesaka T, Nishikawa J, Okamura H, Suda K, Sakai H, Tamii A, Sekiguchi K, Yako K, Sakoda S, Kato H, Hatano M, Maeda Y, Saito T, Uchigashima N, Sakamoto N, Satou Y, Ohnishi T, Wakui T, Wakasa T, Itoh K, He-3(d, p)He-4 reaction at intermediate energies and impulse picture of the (d, p) reactions, PHYSICS LETTERS B, 533 (1-2): 1-7 MAY 2 2002, 2002.05.
213. Allgower CE, Krueger KW, Kasprzyk TE, Spinka HM, Underwood DG, Yokosawa A, Bunce G, Huang H, Makdisi Y, Roser T, Syphers M, Derevschikov AA, Matulenko YA, Nogach LV, Nurushev SB, Vasiliev AN, Bai M, Lee SY, Goto Y, Hayashi N, Ichihara T, Okamura M, Saito , Measurement of analyzing powers of pi(+) and pi(-) produced on a hydrogen and a carbon target with a 22-GeV/c incident polarized proton beam, PHYSICAL REVIEW D, 65 (9): art. no. 092008 Part A MAY 1 2002, 2002.05.
214. T. Uesaka, J. Nishikawa, H. Okamura, K. Suda, H. Sakai, A. Tamii, K. Sekiguchi, K. Yako, S. Sakoda, H. Kato, M. Hatano, Y. Maeda, T. Saito, N. Uchigashima, N. Sakamoto, Y. Satou, T. Ohnishi, T. Wakui, T. Wakasa, K. Itoh, 3He(d, p)4He reaction at intermediate energies and impulse picture of the (d, p) reactions, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/S0370-2693(02)01565-4, 533, 1-2, 1-7, 2002.05, Cross section, tensor analyzing power T20, and vector polarization correlation coefficient Cy,y for the 3He(d, p)4He reaction have been measured at 0° and Ed = 140, 200, and 270 MeV. The data are compared with a calculation based on an impulse approximation taking the D-state admixtures in deuteron, 3He, and 4He explicitly into account. The reasonable agreement with the data is understood as a consequence of a close connection between the 3He(d, p)4He reaction and the d + N backward scattering..
215. C. E. Allgower, K. W. Krueger, T. E. Kasprzyk, H. M. Spinka, D. G. Underwood, A. Yokosawa, G. Bunce, H. Huang, Y. Makdisi, T. Roser, M. Syphers, A. A. Derevschikov, Yu A. Matulenko, L. V. Nogach, S. B. Nurushev, A. N. Vasiliev, M. Bai, S. Y. Lee, Y. Goto, N. Hayashi, T. Ichihara, M. Okamura, N. Saito, H. En'yo, K. Imai, Y. Kondo, Y. Nakada, M. Nakamura, H. Saito, H. Sakai, T. Wakasa, K. Yako, V. Baturine, A. Ogawa, V. Ghazikhanian, G. Igo, S. Trentalange, C. Whitten, N. I. Belikov, A. I. Pavlinov, Measurement of analyzing powers of π+ and π- produced on a hydrogen and a carbon target with a 22-GeV/c incident polarized proton beam, Physical Review D - Particles, Fields, Gravitation and Cosmology, 65, 9 A, 920081-9200824, 2002.05, The analyzing powers of π+ and π- were measured using an incident 22-GeV/c transversely polarized proton beam at the Brookhaven Alternating Gradient Synchrotron. A magnetic spectrometer measured π± inclusive asymmetries on a hydrogen and a carbon target. An elastic polarimeter with a CH2 target measured pp elastic-scattering asymmetries to determine the beam polarization using published data for the pp elastic analyzing power. Using the beam polarization determined from the elastic polarimeter and asymmetries from the inclusive spectrometer, analyzing powers AN for π± were determined in the xF and PT ranges (0.45-0.8) and (0.3-1.2 GeV/c), respectively. The analyzing power results are similar in both sign and character to other measurements at 200 and 11.7 GeV/c, confirming the expectation that high-energy pion inclusive analyzing powers remain large and relatively energy independent. This suggests that pion inclusive polarimetry may be a suitable method for measuring future beam polarizations at BNL RHIC or DESY HERA. Analyzing powers of π+ and π- produced on hydrogen and carbon targets are the same. Various models to explain inclusive analyzing powers are also discussed..
216. Wakasa T, Hatanaka K, Fujita Y, Berg GPA, Fujimura H, Fujita H, Itoh M, Kamiya J, Kawabata T, Nagayama K, Noro T, Sakaguchi H, Shimbara Y, Takeda H, Tamura K, Ueno H, Uchida M, Uraki M, Yosoi M, High resolution beam line for the Grand Raiden spectrometer, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 482 (1-2): 79-93 APR 11 2002, 2002.04.
217. Tamii A, Hatanaka K, Hatano M, Hirooka D, Kamiya J, Kato H, Maeda Y, Saito T, Sakai H, Sakoda S, Sekiguchi K, Uchigashima N, Uesaka T, Wakasa T, Yako K, Search for narrow dibaryon resonances by the pd -> pdX and pd -> ppX reactions, PHYSICAL REVIEW C, 65 (4): art. no. 047001 APR 2002, 2002.04.
218. Miklukho OV, Andreev VA, Andronenko MN, Amalsky GM, Belostotski SL, Domchenkov OA, Fedorov OY, Grebenyuk OG, Izotov AA, Jgoun AA, Kisselev AY, Kopytin MA, Naryshkin YG, Prokofiev AN, Prokofiev DA, Sanjiev YM, Shvedchikov AV, Sulimov VV, Trush SI, Vikhrov , Study of nuclear medium effects on polarization in (p, 2p) scattering at 1 GeV, CZECHOSLOVAK JOURNAL OF PHYSICS, 52: C293-C300 Part 1 Suppl. C 2002, 2002.04.
219. T. Wakasa, K. Hatanaka, Y. Fujita, G. P.A. Berg, H. Fujimura, H. Fujita, M. Itoh, J. Kamiya, T. Kawabata, K. Nagayama, Tetsuo Noro, H. Sakaguchi, Y. Shimbara, H. Takeda, K. Tamura, H. Ueno, M. Uchida, M. Uraki, M. Yosoi, High resolution beam line for the Grand Raiden spectrometer, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 482, 1-3, 79-93, 2002.04, We have designed and constructed a new beam line which can accomplish both lateral and angular dispersion matching with the Grand Raiden spectrometer. In dispersive mode, lateral and angular dispersions of the beam line are b16 = 37.1 m and b26 = -20.0 rad, respectively, to satisfy matching conditions for Grand Raiden. In achromatic mode, the beam line satisfies the double achromatic condition of b16 = b26 = 0. The magnifications of the beam line are (Mx, My) = (-0.98, 0.89) and (-1.00, -0.99) for dispersive and achromatic modes, respectively. In the commissioning experiments, we have succeeded to separate the first excited 2+ state of 168Er with Ex = 79.8 keV clearly from the ground state in the (p, p′) reaction. We achieved energy resolutions of ΔE = 13.0 ± 0.3 and 16.7 ± 0.3 keV in full width at half-maximum for 295 and 392 MeV protons, respectively. These energy resolutions agree with the resolving power of Grand Raiden for an object size of about 1 mm..
220. A. Tamii, K. Hatanaka, M. Hatano, D. Hirooka, J. Kamiya, H. Kato, Y. Maeda, T. Saito, H. Sakai, S. Sakoda, K. Sekiguchi, N. Uchigashima, T. Uesaka, T. Wakasa, K. Yako, Search for narrow dibaryon resonances by the pd→pdX and pd→ppX reactions, Physical Review C - Nuclear Physics, 65, 4, 470011-470014, 2002.04, Nucleon-nucleon decoupled dibaryons below the pion emission threshold have been investigated by the pd→pdX and pd→ppX reactions at Ep - 300 MeV. Such dibaryons are predicted to either decay into a deuteron or two nucleons by emitting a γ ray and consequently have a very narrow width of less than 1 keV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A mass resolution of 0.95 MeV and background-free condition have been achieved. No resonance was found in either the d + γ or p + n + γ decay channels within the mass region of 1896-1914 MeV. Upper limits for the dibaryon production cross section are presented..
221. Sekiguchi K, Sakai H, Witala H, Glockle W, Golak J, Hatano M, Kamada H, Kato H, Maeda Y, Nishikawa J, Nogga A, Ohnishi T, Okamura H, Sakamoto N, Sakoda S, Satou Y, Suda K, Tamii A, Uesaka T, Wakasa T, Yako K, Complete set of precise deuteron analyzing powers at intermediate energies: Comparison with modern nuclear force predictions, PHYSICAL REVIEW C, 65 (3): art. no. 034003 MAR 2002, 2002.03.
222. Wakasa T, Hatanaka K, Sakai H, Greenfield MB, Kamiya J, Ogata K, Okamura H, Sekiguchi K, Suda K, Tamii A, Yako K, Cross sections and polarization observables for the Ca-40(p,n) reaction at 345 MeV and multistep contributions in the continuum, PHYSICAL REVIEW C, 65 (3): art. no. 034615 MAR 2002, 2002.03.
223. K. Sekiguchi, H. Sakai, H. Sakai, H. Witała, H. Witała, W. Glöckle, J. Golak, J. Golak, M. Hatano, H. Kamada, H. Kato, Y. Maeda, J. Nishikawa, A. Nogga, T. Ohnishi, H. Okamura, N. Sakamoto, S. Sakoda, Y. Satou, K. Suda, A. Tamii, T. Uesaka, T. Wakasa, K. Yako, Complete set of precise deuteron analyzing powers at intermediate energies
Comparison with modern nuclear force predictions, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.65.034003, 65, 3, 340031-3400316, 2002.03, Precise measurements of deuteron vector and tensor analyzing powers Ayd, Axx, Ayy, and Axz in d-p elastic scattering were performed via 1H(d,d)p and 1H(d,p)d reactions at three incoming deuteron energies of Edlab = 140, 200, and 270 MeV. A wide range of center-of-mass angles from ≈ 10° to 180° was covered. The cross section was measured at 140 and 270 MeV at the same angles. These high precision data were compared with theoretical predictions based on exact solutions of three-nucleon Faddeev equations and modern nucleon-nucleon potentials combined with three-nucleon forces. Three-body interactions representing a wide range of present day models have been used: the Tucson-Melbourne 2 π-exchange model, a modification thereof closer to chiral symmetry, the Urbana IX model, and a phenomenological spin-orbit ansatz. Large three-nucleon force effects are predicted, especially at the two higher energies. However, only some of them, predominantly dσ/dΩ and Ayd, are supported by the present data. For tensor analyzing powers the predicted effects are in drastic conflict to the data, indicating defects of the present day three-nucleon force models..
224. Hatanaka K, Kamiya J, Hirooka D, Maeda Y, Maeda Y, Noro T, Obayashi E, Okamura H, Sakai H, Tamii A, Tamura K, Wakasa T, Yako K, Yoshida HP, C-12,C-13(rho, pi(-)) O-13,14(g.s.) reactions in the Delta(1232) resonance region, PHYSICAL REVIEW C, 65 (1): art. no. 014609 JAN 2002, 2002.01.
225. K. Hatanaka, J. Kamiya, D. Hirooka, Y. Maeda, Y. Maeda, Tetsuo Noro, E. Obayashi, H. Okamura, H. Sakai, A. Tamii, K. Tamura, Tomotsugu Wakasa, K. Yako, H. P. Yoshida, 12,13C(p, π-) 13,14Og.s. reactions in the Δ1232 resonance region, Physical Review C - Nuclear Physics, 65, 1, 146091-146095, 2002.01, The role of the Δ resonance has been discussed for the 12,13,14C(p, π-)13,14,15Og.s. reactions both experimentally and theoretically. Recent calculations suggested resonance effects in the energy dependence of the differential cross section that seem to contradict existing data. Since the available data points are limited, it is important to measure the energy dependence of the differential cross sections and the analyzing powers in order to better understand the still unclear reaction mechanism of the ground state (p, π-) reactions. In the present paper, angular distributions of the differential cross sections and the analyzing powers were measured for 12,13C(p, π±) reactions at incident energies of 250, 300, and 350 MeV. Experimental results for the 12C(p, π-)13Og.s. reaction are compared with full-range distorted-wave Born approximation calculations..
226. T. Wakasa, K. Hatanaka, H. Sakai, H. Sakai, M. B. Greenfield, J. Kamiya, K. Ogata, H. Okamura, K. Sekiguchi, K. Suda, A. Tamii, K. Yako, Cross sections and polarization observables for the 40Ca(p,n) reaction at 345 MeV and multistep contributions in the continuum, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.65.034615, 65, 3, 346151-346158, 2002.01, The double-differential cross sections and analyzing powers over an angular range of 30° ≤ θlab ≤ 75°, and the induced polarizations P and polarization transfer values DNN at 30° and 40° for the 40Ca(p,n) reaction are measured at a bombarding energy of 345 MeV. The data are compared with theoretical calculations in a semiclassical distorted wave (SCDW) model employing through three- and two-step contributions for cross sections and polarization observables, respectively. At forward angles, the SCDW calculations reproduce the observed cross sections fairly well around the quasielastic peak. The one-step contribution is dominant at θlab = 30°, while the two- and three-step contributions become more important with increasing reaction angle. At backward angles the calculations underestimate the cross sections in the whole region, which indicates the significance of higher-step contributions. The DNN values, which are sensitive to the effective nucleon-nucleon interaction in the nuclear medium, are close to those calculated with the G-matrix interaction parametrized by the Melbourne group..
227. C. E. Allgower, K. W. Krueger, T. E. Kasprzyk, H. M. Spinka, D. G. Underwood, A. Yokosawa, G. Bunce, H. Huang, Y. Makdisi, T. Roser, M. Syphers, A. A. Derevschikov, Yu A. Matulenko, L. V. Nogach, S. B. Nurushev, A. N. Vasiliev, M. Bai, S. Y. Lee, Y. Goto, N. Hayashi, T. Ichihara, M. Okamura, N. Saito, H. En’yo, K. Imai, Y. Kondo, Y. Nakada, M. Nakamura, H. Saito, H. Sakai, T. Wakasa, K. Yako, V. Baturine, A. Ogawa, V. Ghazikhanian, G. Igo, S. Trentalange, C. Whitten, N. I. Belikov, A. I. Pavlinov, Measurement of analyzing powers of [Formula Presented] and [Formula Presented] produced on a hydrogen and a carbon target with a [Formula Presented] incident polarized proton beam, Physical Review D - Particles, Fields, Gravitation and Cosmology, 10.1103/PhysRevD.65.092008, 65, 9, 2002.01, The analyzing powers of (Formula presented) and (Formula presented) were measured using an incident (Formula presented) transversely polarized proton beam at the Brookhaven Alternating Gradient Synchrotron. A magnetic spectrometer measured (Formula presented) inclusive asymmetries on a hydrogen and a carbon target. An elastic polarimeter with a (Formula presented) target measured pp elastic-scattering asymmetries to determine the beam polarization using published data for the pp elastic analyzing power. Using the beam polarization determined from the elastic polarimeter and asymmetries from the inclusive spectrometer, analyzing powers (Formula presented) for (Formula presented) were determined in the (Formula presented) and (Formula presented) ranges (Formula presented) and (Formula presented) respectively. The analyzing power results are similar in both sign and character to other measurements at 200 and (Formula presented) confirming the expectation that high-energy pion inclusive analyzing powers remain large and relatively energy independent. This suggests that pion inclusive polarimetry may be a suitable method for measuring future beam polarizations at BNL RHIC or DESY HERA. Analyzing powers of (Formula presented) and (Formula presented) produced on hydrogen and carbon targets are the same. Various models to explain inclusive analyzing powers are also discussed..
228. T. Kawabata, T. Ishikawa, M. Itoh, M. Nakamura, H. Sakaguchi, H. Takeda, T. Taki, M. Uchida, Y. Yasuda, M. Yosoi, H. Akimune, K. Yamasaki, G. P.A. Berg, H. Fujimura, K. Hara, K. Hatanaka, J. Kamiya, T. Noro, E. Obayashi, T. Wakasa, H. P. Yoshida, B. A. Brown, H. Fujita, Y. Fujita, Y. Shimbara, H. Ueno, M. Fujiwara, K. Hosono, A. Tamii, H. Toyokawa, Polarization transfer in the [Formula Presented] reaction at forward angles and structure of the spin-dipole resonances, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.65.064316, 65, 6, 2002.01, Cross sections and polarization transfer observables in the [Formula Presented] reactions at 392 MeV were measured at several angles between [Formula Presented] and 14°. The non-spin-flip [Formula Presented] and spin-flip [Formula Presented] strengths in transitions to several discrete states and broad resonances in [Formula Presented] were extracted using a model-independent method. The giant resonances in the energy region of [Formula Presented] were found to be predominantly excited by [Formula Presented] transitions. The strength distribution of spin-dipole transitions with [Formula Presented] and [Formula Presented] were deduced. The obtained distribution was compared with a recent shell model calculation. Experimental results are reasonably explained by distorted-wave impulse-approximation calculations with the shell model wave functions..
229. A. Tamii, K. Hatanaka, M. Hatano, D. Hirooka, J. Kamiya, H. Kato, Y. Maeda, T. Saito, H. Sakai, S. Sakoda, K. Sekiguchi, N. Uchigashima, T. Uesaka, Tomotsugu Wakasa, K. Yako, Search for narrow dibaryon resonances by the [Formula Presented] and [Formula Presented] reactions, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.65.047001, 65, 4, 2002.01, Nucleon-nucleon decoupled dibaryons below the pion emission threshold have been investigated by the [Formula Presented] and [Formula Presented] reactions at [Formula Presented] Such dibaryons are predicted to either decay into a deuteron or two nucleons by emitting a [Formula Presented] ray and consequently have a very narrow width of less than 1 keV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A mass resolution of 0.95 MeV and background-free condition have been achieved. No resonance was found in either the [Formula Presented] or [Formula Presented] decay channels within the mass region of 1896–1914 MeV. Upper limits for the dibaryon production cross section are presented..
230. K. Hatanaka, J. Kamiya, D. Hirooka, Y. Maeda, Y. Maeda, T. Noro, E. Obayashi, H. Okamura, H. Sakai, A. Tamii, K. Tamura, Tomotsugu Wakasa, K. Yako, H. P. Yoshida, [Formula Presented] reactions in the [Formula Presented] resonance region, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.65.014609, 65, 1, 2002.01, The role of the Δ resonance has been discussed for the [Formula Presented] reactions both experimentally and theoretically. Recent calculations suggested resonance effects in the energy dependence of the differential cross section that seem to contradict existing data. Since the available data points are limited, it is important to measure the energy dependence of the differential cross sections and the analyzing powers in order to better understand the still unclear reaction mechanism of the ground state [Formula Presented] reactions. In the present paper, angular distributions of the differential cross sections and the analyzing powers were measured for [Formula Presented] reactions at incident energies of 250, 300, and 350 MeV. Experimental results for the [Formula Presented] reaction are compared with full-range distorted-wave Born approximation calculations..
231. Satou Y, Ishida S, Sakai H, Okamura H, Otsu H, Sakamoto N, Uesaka T, Wakasa T, Ohnishi T, Sekiguchi K, Yako K, Ichihara T, Niizeki T, Itoh KS, Nishimori N, Measurement of single and double spin-flip probabilities in inelastic deuteron scattering on C-12 at 270 MeV, PHYSICS LETTERS B, 521 (3-4): 153-157 NOV 29 2001, 2001.11.
232. Y. Satou, S. Ishida, H. Sakai, H. Okamura, H. Otsu, N. Sakamoto, T. Uesaka, T. Wakasa, T. Ohnishi, K. Sekiguchi, K. Yako, T. Ichihara, T. Niizeki, K. S. Itoh, N. Nishimori, Measurement of single and double spin-flip probabilities in inelastic deuteron scattering on 12C at 270 MeV, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/S0370-2693(01)01202-3, 521, 3-4, 153-157, 2001.11, The deuteron single and double spin-flip probabilities, S1 and S2, have been measured for the 12C(d̄;d̄′) reaction at Ed = 270 MeV for an excitation energy range between 4 and 24 MeV and a scattering angular range between Θlab = 2.5° and 7.5°. The extracted S1 exhibits characteristic values depending on the structure of the excited state. The S2 is close to zero over the measured excitation energy range. The SFP angular distribution data for the 2+ (4.44 MeV) and 1+ (12.71 MeV) states are well described by the microscopic DWIA calculations..
233. T. Koi, Y. Muraki, K. Masuda, Y. Matsubara, T. Sako, T. Murata, H. Tsuchiya, S. Shibata, Y. Munakata, K. Hatanaka, T. Wakasa, H. Sakai, Attenuation of neutrons in the atmosphere and a thick carbon target, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/S0168-9002(01)00289-3, 469, 1, 63-69, 2001.08, A neutron beam dump experiment has been carried out using the accelerator beam at RCNP, Osaka University. Neutrons with energies Tn = 100-400 MeV were allowed to bombard a carbon target (density 1.8 g/cm3) which had a thickness varying from 0 to 300 cm, and the attenuation of the neutrons was measured in the range from 0 to 540 g/cm2. The experimental data were well reproduced by the Monte Carlo calculation by the Shibata model. Using these results, the attenuation of neutrons in the Earth's atmosphere was obtained by means of a simulation. The results are useful not only for cosmic ray experiments but also for radiation protection experiments since the target does not contain hydrogen..
234. Sakai H, Maeda Y, Sekiguchi K, Glockle W, Greenfield MB, Hatanaka K, Hatano M, Hirooka D, Kamada H, Kamiya J, Kato H, Ohnishi T, Okamura H, Rapaport J, Saito T, Sakamoto N, Sakoda S, Satou Y, Suda K, Tamii A, Uchigashima N, Uesaka T, Wakasa T, Witala H, Y, (d)over-right-arrow-p and (n)over-right-arrow-d scatterings at intermediate energy and three-nucleon force effects, NUCLEAR PHYSICS A, 689 (1-2): 353C-356C JUN 18 2001, 2001.06.
235. H. Sakai, Y. Maeda, K. Sekiguchi, W. Glöckle, M. B. Greenfield, K. Hatanaka, M. Hatano, D. Hirooka, H. Kamada, J. Kamiya, H. Kato, T. Ohnishi, H. Okamura, J. Rapaport, T. Saito, N. Sakamoto, S. Sakoda, Y. Satou, K. Suda, A. Tamii, N. Uchigashima, T. Uesaka, Tomotsugu Wakasa, H. Witała, K. Yako, d→p and n→d scatterings at intermediate energy and three-nucleon force effects, Nuclear Physics A, 689, 1-2, 353-356, 2001.06, Precise data on cross sections, analyzing powers and polarization transfer coefficients are measured for the dp elastic scattering at 270 MeV (135 MeV/nucleon) and compared to Faddeev calculations assuming the nd scattering with modern nucleon-nucleon (NN) forces including the 2π exchange Tucson-Melbourne (TM) three-nucleon (3N) force. Excellent fits are obtained for the cross sections and vector analyzing powers when the 3N force is included, while the fits are deteriorated for the tensor analyzing powers if the 3N force is included. A moderate fit is obtained for the polarization transfer coefficients. Based on theses results, one can conclude that the size of amplitudes of the TM-SN force may be adequate but the spin dependent part may be deficient. The cross sections and the vector analyzing powers for the nd elastic scattering at 250 MeV are measured for the first time. Backward cross sections are underestimated by the NN+3N force Faddeev calculations. This difference might be attributed to relativistic effects..
236. Shibata S, Munakata Y, Tatsuoka R, Muraki Y, Masuda K, Matsubara Y, Koi T, Sako T, Murata T, Tsuchiya H, Hatanaka K, Wakasa T, Sakai H, Ishida Y, Detection efficiency of a neutron monitor calibrated by an accelerator neutron beam, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 463 (1-2): 316-320 MAY 1 2001, 2001.05.
237. Tsuchiya H, Muraki Y, Masuda K, Matsubara Y, Koi T, Sako T, Ohno S, Hoshida T, Shibata S, Munakata Y, Hatanaka K, Wakasa T, Sakai H, Detection efficiency of a new type of solar neutron detector calibrated by an accelerator neutron beam, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 463 (1-2): 183-193 MAY 1 2001, 2001.05.
238. Uesaka T, Sakai H, Okamura H, Tamii A, Satou Y, Ohnishi T, Sekiguchi K, Yako K, Suda K, Sakoda S, Nishikawa J, Hatano M, Kato H, Maeda Y, Sakamoto N, Wakasa T, Itoh K, He-3(d, p)He-4 reaction at intermediate energies, NUCLEAR PHYSICS A, 684: 606C-608C MAR 12 2001, 2001.05.
239. Sekiguchi K, Sakai H, Okamura H, Sakamoto N, Tamii A, Uesaka T, Wakasa T, Satou Y, Ohnishi T, Yako K, Sakoda S, Suda K, Kato H, Maeda Y, Hatano M, Nishikawa J, Measurement of cross sections and analyzing powers for the d-p elastic scattering at intermediate energies, NUCLEAR PHYSICS A, 684: 574C-576C MAR 12 2001, 2001.05.
240. Sakai H, Sekiguchi K, Kato H, Hatano M, Maeda Y, Ohnishi T, Okamura H, Sakamoto N, Sakoda S, Satou Y, Suda K, Tamii A, Uesaka T, Wakasa T, Yako K, Polarization transfer measurements for dp scattering at 270 MeV, NUCLEAR PHYSICS A, 684: 577C-579C MAR 12 2001, 2001.05.
241. Yako K, Sakai H, Tamii A, Sekiguchi K, Sakoda S, Maeda Y, Hatano M, Kato H, Okamura H, Suda K, Greenfield MB, Wakasa T, Kamiya J, Hirooka D, Hatanaka K, The RCNP (n,p) facility, NUCLEAR PHYSICS A, 684: 563C-565C MAR 12 2001, 2001.05.
242. H. Tsuchiya, Y. Muraki, K. Masuda, Y. Matsubara, T. Koi, T. Sako, S. Ohno, T. Hoshida, S. Shibata, Y. Munakata, K. Hatanaka, T. Wakasa, H. Sakai, Detection efficiency of a new type of solar neutron detector calibrated by an accelerator neutron beam, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/S0168-9002(01)00290-X, 463, 1-2, 183-193, 2001.05, A new type solar neutron detector has been developed and a few have been installed on several high mountains around the world. Till now, seven solar neutron detectors have been operated for the observation of solar neutrons in association with solar flares. For the purpose of calibrating the detection efficiency of this new type of solar neutron detector, we carried out an accelerator experiment at the Research Center for Nuclear Physics of Osaka University between February 1996 and June 1999. In this paper, we report the detection efficiency obtained by the accelerator experiment and the results are compared with Monte Carlo simulations..
243. S. Shibata, Y. Munakata, R. Tatsuoka, Y. Muraki, K. Masuda, Y. Matsubara, T. Koi, T. Sako, T. Murata, H. Tsuchiya, K. Hatanaka, T. Wakasa, H. Sakai, Y. Ishida, Detection efficiency of a neutron monitor calibrated by an accelerator neutron beam, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/S0168-9002(01)00280-7, 463, 1-2, 316-320, 2001.05, The neutron monitor developed by Simpson (Phys. Rev. 73 (1948) 1389) has been widely used to measure the intensity of cosmic rays. However, the detection efficiency of the neutron monitor has never been calibrated using an accelerator beam. This paper gives the first results of measurements of the detection efficiency of the neutron monitor using the accelerator beam at RCNP, Osaka University. The experimental data reproduce both the early prediction by Hatton and the recent calculation by Clem surprisingly well..
244. Wakasa T, Hatanaka K, Sakai H, Fujita S, Nonaka T, Yako K, Sekiguchi K, Okamura H, Uesaka T, Otsu H, Ishida S, Sakamoto N, Satou Y, Ohnishi T, Greenfield MB, Gamow-Teller strength in the continuum and quenching problem, NUCLEAR PHYSICS A, 687 (1-2): 26C-31C APR 23 2001, 2001.04.
245. Fujita Y, Adachi T, Akimune H, Bacher AD, Berg GPA, Black T, Daito I, Foster CC, Fujimura H, Fujita H, Fujiwara M, Hara K, Harada K, Harakeh MN, Hatanaka K, Inomata T, Janecke J, Kamiya J, Kanzaki Y, Katori K, Kawabata T, Lozowski W, Nagayama K, Noro T, R, Isospin symmetry-structure study at new high-resolution course of RCNP, NUCLEAR PHYSICS A, 687 (1-2): 311C-320C APR 23 2001, 2001.04.
246. Tomotsugu Wakasa, K. Hatanaka, H. Sakai, S. Fujita, T. Nonaka, K. Yako, K. Sekiguchi, H. Okamura, T. Uesaka, H. Otsu, S. Ishida, N. Sakamoto, Y. Satou, T. Ohnishi, M. B. Greenfield, Gamow-Teller strength in the continuum and quenching problem, Nuclear Physics A, 10.1016/S0375-9474(01)00596-6, 687, 1-2, 26-31, 2001.04, The double differential cross sections for θ
lab
between 0.0° and 14.7° and the polarization transfer coefficient D
NN
(0°) for the
27
Al(p→, n→) reaction have been measured at a bombarding energy of 295 MeV. A multipole decomposition technique is applied for the cross section data to extract L = 0, 1, 2, and 3 contributions. A fairly large L = 0 Gamow-Teller (GT) contribution is observed in the continuum region up to 50 MeV, which could be in part ascribed to the quenched GT strength. A limit on the effect that the Δ(1232)-isobar nucleon-hole admixture has upon the GT strength is estimated..
247. Y. Fujita, T. Adachi, H. Akimune, A. D. Bacher, G. P.A. Berg, T. Black, I. Daito, C. C. Foster, H. Fujimura, H. Fujita, M. Fujiwara, K. Hara, K. Harada, M. N. Harakeh, K. Hatanaka, T. Inomata, J. Jänecke, J. Kamiya, Y. Kanzaki, K. Katori, T. Kawabata, W. Lozowski, K. Nagayama, T. Noro, D. A. Roberts, H. Sakaguchi, Y. Shimbara, T. Shinada, E. J. Stephenson, A. Tamii, K. Tamura, M. Tanaka, H. Ueno, T. Wakasa, T. Yamanaka, M. Yoshifuku, M. Yosoi, Isospin symmetry-structure study at new high-resolution course of RCNP, Nuclear Physics A, 10.1016/S0375-9474(01)00637-6, 687, 1-2, 311-320, 2001.04, By comparing IE type data from γ decay and (p,p′) reaction with the data from CE type (3He, t) reaction, we have shown that the isospin symmetry structure exists up to Ex = 16 MeV in the mirror nuclei 27Al-27Si. In addition, from the analysis of different transition strengths in (p,p′) and (3He, t) reactions to analogous final states, isospin values could be assigned to highly excited states. Good resolution was important to assign the corresponding (analogous) states in hadron reactions at intermediate incident energies, where it is known that 0° cross sections are proportional to B(GT) values. The resolution in the CE type reaction was drastically improved by using the (3He, t) reaction in combination with beam matching techniques. At RCNP a new beam line WS-course, which fully allows the realization of several matching conditions with the existing spectrometer, was commissioned. A resolution of 50 keV has been achieved for an incident energy of 150 MeV/nucleon and a better resolution is still expected. Good angle resolution realized simultaneously is also important for the selection of specific L states. We believe these high resolutions now available will open a new dimension not only in the spectroscopic study of spin excitations, like the study of isospin symmetry structure presented here, but also in better understanding the problems related with interactions through the separation of specific states of interest..
248. T. Uesaka, H. Sakai, H. Okamura, A. Tamii, Y. Satou, T. Ohnishi, K. Sekiguchi, K. Yako, K. Suda, S. Sakoda, J. Nishikawa, M. Hatano, H. Kato, Y. Maeda, N. Sakamoto, T. Wakasa, K. Itoh, 3He(d→,p)4He reaction at intermediate energies, Nuclear Physics A, 10.1016/S0375-9474(01)00451-1, 684, 1-4, 606-608, 2001.03.
249. K. Sekiguchi, H. Sakai, H. Okamura, N. Sakamoto, A. Tamii, T. Uesaka, T. Wakasa, Y. Satou, T. Ohnishi, K. Yako, S. Sakoda, K. Suda, H. Kato, Y. Maeda, M. Hatano, J. Nishikawa, Measurement of cross sections and analyzing powers for d–p elastic scattering at intermediate energies, Nuclear Physics A, 10.1016/S0375-9474(01)00371-2, 684, 1-4, 574-576, 2001.03.
250. H. Sakai, K. Sekiguchi, H. Kato, M. Hatano, Y. Maeda, T. Ohnishi, H. Okamura, N. Sakamoto, S. Sakoda, Y. Satou, K. Suda, A. Tamii, T. Uesaka, T. Wakasa, K. Yako, Polarization transfer measurements for dp scattering at 270 MeV, Nuclear Physics A, 10.1016/S0375-9474(01)00374-8, 684, 1-4, 577-579, 2001.03.
251. K. Yako, H. Sakai, A. Tamii, K. Sekiguchi, S. Sakoda, Y. Maeda, M. Hatano, H. Kato, H. Okamura, K. Suda, M. B. Greenfield, T. Wakasa, J. Kamiya, D. Hirooka, K. Hatanaka, The RCNP (n,p) facility, Nuclear Physics A, 10.1016/S0375-9474(01)00396-7, 684, 1-4, 563-565, 2001.03.
252. Kawabata T, Akimune H, Fujimura H, Fujita H, Fujita Y, Fujiwara M, Hara K, Hatanaka K, Hosono K, Ishikawa T, Itoh M, Kamiya J, Nakamura M, Noro T, Obayashi E, Sakaguchi H, Shimbara Y, Takeda H, Taki T, Tamii A, Toyokawa H, Tsukahara N, Uchida M, Ueno H, W, Thin ice target for O-16(p,p ') experiment, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 459 (1-2): 171-176 FEB 21 2001, 2001.02.
253. T. Kawabata, H. Akimune, H. Fujimura, H. Fujita, Y. Fujita, M. Fujiwara, K. Hara, K. Hatanaka, K. Hosono, T. Ishikawa, M. Itoh, J. Kamiya, M. Nakamura, T. Noro, E. Obayashi, H. Sakaguchi, Y. Shimbara, H. Takeda, T. Taki, A. Tamii, H. Toyokawa, N. Tsukahara, M. Uchida, H. Ueno, T. Wakasa, K. Yamasaki, Y. Yasuda, H. P. Yoshida, M. Yosoi, Thin ice target for 16O(p,p′) experiment, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/S0168-9002(00)00992-X, 459, 1-2, 171-176, 2001.02, A method to prepare a windowless, self-supporting and low-cost ice target is described. The produced target was successfully used to measure the spectra of inelastic proton scattering from 16O. An ice target of about 30 mg/cm2 worked stably. The target thickness was monitored for 7 hours by measuring p+p elastic scattering and no meaningful variation of the thickness was observed. No obvious effect of contaminations due to the congelation of residual gases on the target was detected. Since a thin ice target was made, measurements of charged decay particles in coincidence with inelastically scattered particles are possible..
254. Kamada H, Uesaka T, Glockle W, Sakai H, Gojuki S, Itoh K, Ohnishi T, Okamura H, Sakamoto N, Sakoda S, Satou Y, Sekiguchi K, Suda K, Tamii A, Wakasa T, Witala H, Yako K, A model for the He-3((d)over-right-arrow,p)He-4 reaction at intermediate energies, PROGRESS OF THEORETICAL PHYSICS, 104 (3): 703-708 SEP 2000, 2000.09.
255. Hiroyuki Kamada, Tomohiro Uesaka, Walter Glöckle, Hideyuki Sakai, Shuichi Gojuki, Kazuya Itoh, Tetsuya Ohnishi, Hiroyuki Okamura, Naruhiko Sakamoto, Seitaro Sakoda, Yoshiteru Satou, Kimiko Sekiguchi, Kenji Suda, Atsushi Tamii, Tomotsugu Wakasa, Henryk Witała, Kentaro Yako, A model for the 3He(d, p)4He reaction at intermediate energies, Progress of Theoretical Physics, 10.1143/PTP.104.703, 104, 3, 703-708, 2000.09, Polarization correlation coefficients have been measured at RIKEN for the 3He(d, p)4He reaction at intermediate energies (Ed = 270 MeV). We propose a model for the (d, p) reaction mechanism using the pd elastic scattering amplitude, which is rigorously determined with a Faddeev calculation and using modern NN forces. Our theoretical predictions for the deuteron polarization observables Ay, Ayy, Axx and Axz at Ed = 140, 200 and 270 MeV are given. The Ay observables agree qualitatively in shape with the new experimental data for the reaction 3He(d, p)4He..
256. Sakai H, Sekiguchi K, Witala H, Glockle W, Hatano M, Kamada H, Kato H, Maeda Y, Nogga A, Ohnishi T, Okamura H, Sakamoto N, Sakoda S, Satou Y, Suda K, Tamii A, Uesaka T, Wakasa T, Yako K, Precise measurement of dp elastic scattering at 270 MeV and three-nucleon force effects, PHYSICAL REVIEW LETTERS, 84 (23): 5288-5291 JUN 5 2000, 2000.06.
257. Tanifuji M, Ishikawa S, Iseri Y, Uesaka T, Sakamoto N, Satou Y, Itoh K, Sakai H, Tamii A, Ohnishi T, Sekiguchi K, Yako K, Sakoda S, Okamura H, Suda K, Wakasa T, Reaction mechanism and characteristics of T-20 in d+He-3 backward elastic scattering at intermediate energies, PHYSICAL REVIEW C, 61 (2): art. no. 024602 FEB 2000, 2000.02.
258. H. Sakai, K. Sekiguchi, H. Witała, W. Glöckle, M. Hatano, H. Kamada, H. Kato, Y. Maeda, A. Nogga, T. Ohnishi, H. Okamura, N. Sakamoto, S. Sakoda, Y. Satou, K. Suda, A. Tamii, T. Uesaka, Tomotsugu Wakasa, K. Yako, Precise measurement of dp elastic scattering at 270 mev and three-nucleon force effects, Physical Review Letters, 10.1103/PhysRevLett.84.5288, 84, 23, 5288-5291, 2000.01, The cross section, the deuteron vector Ady and tensor analyzing powers Aij, the polarization transfer coefficients Ky'ij, and the induced polarization Py' were measured for the dp elastic scattering at 270 MeV. The cross section and Ady are well reproduced by Faddeev calculations with modern data-equivalent nucleon-nucleon forces plus the Tucson-Melbourne three-nucleon force. In contrast, Aij, Ky'ij, or Py' are not described by such calculations. These facts indicate the deficiencies in the spin dependence of the Tucson-Melbourne force and call for extended three-nucleon force models..
259. M. Tanifuji, S. Ishikawa, Y. Iseri, T. Uesaka, N. Sakamoto, Y. Satou, K. Itoh, H. Sakai, A. Tamii, T. Ohnishi, K. Sekiguchi, K. Yako, S. Sakoda, H. Okamura, K. Suda, Tomotsugu Wakasa, Reaction mechanism and characteristics of T20 in d+ 3He backward elastic scattering at intermediate energies, Physical Review C - Nuclear Physics, 61, 2, 246021-246028, 2000.01, For backward elastic scattering of deuterons by 3He, cross sections σ, and tensor analyzing power T20 are measured at Ed = 140-270 MeV. The data are analyzed by the plane wave impluse approximation (PWIA) and by the general formula which includes virtual excitations of other channels, with the assumption of the proton transfer from 3He to the deuteron. Using 3He wave functions calculated by the Faddeev equation, the PWIA describes global features of the experimental data, while the virtual excitation effects are important for quantitative fits to the T20 data. Theoretical predictions on T20, Ky y (polarization transfer coefficient), and Cyy (spin correlation coefficient) are provided up to GeV energies..
260. M. Tanifuji, S. Ishikawa, Y. Iseri, T. Uesaka, N. Sakamoto, Y. Satou, K. Itoh, H. Sakai, A. Tamii, T. Ohnishi, K. Sekiguchi, K. Yako, S. Sakoda, H. Okamura, K. Suda, T. Wakasa, Reaction mechanism and characteristics of [Formula Presented] in [Formula Presented] backward elastic scattering at intermediate energies, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.61.024602, 61, 2, 2000.01, For backward elastic scattering of deuterons by [Formula Presented] cross sections [Formula Presented] and tensor analyzing power [Formula Presented] are measured at [Formula Presented] MeV. The data are analyzed by the plane wave impluse approximation (PWIA) and by the general formula which includes virtual excitations of other channels, with the assumption of the proton transfer from [Formula Presented] to the deuteron. Using [Formula Presented] wave functions calculated by the Faddeev equation, the PWIA describes global features of the experimental data, while the virtual excitation effects are important for quantitative fits to the [Formula Presented] data. Theoretical predictions on [Formula Presented] (polarization transfer coefficient), and [Formula Presented] (spin correlation coefficient) are provided up to GeV energies..
261. Uesaka T, Sakai H, Okamura H, Ohnishi T, Satou Y, Ishida S, Sakamoto N, Otsu H, Wakasa T, Itoh K, Sekiguchi K, Wakui T, Polarization correlation coefficient for the (3)(H)over-right-arrowe((d)over-right-arrow,p) He-4 reaction, PHYSICS LETTERS B, 467 (3-4): 199-204 NOV 18 1999, 1999.11.
262. Krueger K, Allgower C, Kasprzyk T, Spinka H, Underwood D, Yokosawa A, Bunce G, Huang H, Makdisi Y, Roser T, Syphers M, Belikov NI, Derevschikov AA, Matulenko YA, Nogach LV, Nurushev SB, Pavlinov AI, Vasiliev AN, Bai M, Lee SY, Goto Y, Hayashi N, Ichihara , Large analyzing power in inclusive pi(+/-) production at high x(F) with a 22-GeV/c polarized proton beam, PHYSICS LETTERS B, 459 (1-3): 412-416 JUL 22 1999, 1999.07.
263. H. Sakai, Tomotsugu Wakasa, H. Okamura, H. Otsu, T. Uesaka, N. Sakamoto, Y. Satou, K. Hatanaka, Gamow-Teller strength in the continuum and quenching problem, Nuclear Physics A, 10.1016/S0375-9474(00)88537-1, 654, 1 SUPPL. 1, 731c-734c, 1999.07, Differential cross sections at θlab = 0.0°- 12.3° and a complete set of polarization transfer observables at θlab = 0.0° are measured for the 90Zr(p, n) reaction at Tp = 295 MeV. A multipole decomposition analysis (MDA) technique is applied to the cross sections to deduce the Gamow-Teller (GT) strength B(GT). The obtained Sβ- = ∑ B(GT) value is 28.0 ± 1.6. The total spin transfer ∑ is obtained for the continuum by using polarization transfer measurements. The Sβ- - Sβ+ value is deduced to be 27.0 and this is 90% of Ikeda's sum rule value of 3(N - Z)=30. Thus the quenching of the GT strength is small and the quenching mechanism due to the ΔN- admixture seems to play a minor role..
264. Wakasa T, Sakai H, Hatanaka K, Okamura H, Otsu H, Fujita S, Nonaka T, Uesaka T, Satou Y, Ohnishi T, Yokoyama G, Ishida S, Sakamoto N, Greenfield MB, Ichimura M, Kawahigashi K, Polarization transfer and spin response functions in quasielastic ((p)over-right-arrow,(n)over-right-arrow) reactions at 346 MeV, PHYSICAL REVIEW C, 59 (6): 3177-3195 JUN 1999, 1999.06.
265. Sakai H, Wakasa T, Okamura H, Nonaka T, Ohnishi T, Yako K, Sekiguchi K, Fujita S, Satou Y, Otsu H, Uesaka T, Ishida S, Sakamoto N, Greenfield MB, Hatanaka K, Gamow-Teller strength in the continuum and quenching problem, NUCLEAR PHYSICS A, 649: 251C-259C MAR 28 1999, 1999.05.
266. Satou Y, Ishida S, Sakai H, Okamura H, Otsu H, Sakamoto N, Uesaka T, Wakasa T, Ohnishi T, Nonaka T, Yokoyama G, Ichihara T, Niizeki T, Nishimori N, Study of isoscalar spin strength via the C-12((d)over-right-arrow,(d)over-right-arrow ') reaction, NUCLEAR PHYSICS A, 649: 275C-278C MAR 28 1999, 1999.05.
267. H. Sakai, Tomotsugu Wakasa, H. Okamura, T. Nonaka, T. Ohnishi, K. Yako, K. Sekiguchi, S. Fujita, Y. Satou, H. Otsu, T. Uesaka, S. Ishida, N. Sakamoto, M. B. Greenfield, K. Hatanaka, Gamow-Teller strength in the continuum and quenching problem, Nuclear Physics A, 10.1016/S0375-9474(99)00069-X, 649, 1-4, 251-259, 1999.03, Differential cross sections at θ
lab
= 0.0° 12.3° and a complete set of polarization transfer observables at θ
lab
= 0.0° are measured for the
90
Zr(p, n) reaction at T
p
= 295 MeV. A multipole decomposition (MD) technique is applied to the cross sections to extract partial cross sections σ
L
with L=0, 1, 2, and 3 contributions. A significant amount of σ
L
=0 is found in the highly excited continuum region. After subtracting the estimated iso-vector spin-monopole strength from σ
L
=0, the Gamow-Teller (GT) strength B(GT) is deduced to be S
β-
= ∑ B(GT) = 28 ± 1.6 ± 5.4. The total spin transfer ∑(0°) which is independent of the nuclear reaction mechanisms such as the effective nncleon-nucleon interaction or distortions is derived from the complete set of polarization transfer observables. It is close to unity up to 50 MeV excitation indicating the strong spin-flip character of the continuum. By using the relation between the polarization transfer observables the fractions of natural-parity and unnatural-parity transitions are also obtained and the dominance of unnatural-parity transitions in the continuum is found. These results are consistent with those derived from the MD analysis. The S
β-
- S
β+
value is 27.1 and this is 90% of Ikeda's sum rule value of 3(N - Z)=30. Consequently it is concluded that the quenching of the GT strength is small and the quenching mechanism due to the ΔN admixture seems to play a minor role..
268. Y. Satou, S. Ishida, H. Sakai, H. Okamura, H. Otsu, N. Sakamoto, T. Uesaka, Tomotsugu Wakasa, T. Ohnishi, T. Nonaka, G. Yokoyama, T. Ichihara, T. Niizeki, N. Nishimori, Study of isoscalar spin strength via the
12
C(d→, d′→) reaction, Nuclear Physics A, 649, 1-4, 275-278, 1999.03, The spin-flip probability S
1
and the double-spin-flip probability S
2
for the
12
C(d→, d′→) reaction at Ε
d
=270 MeV have been measured at θ
lab
between 2.5° and 7.5° and for excitation energies up to 25 MeV by using a vector-and-tensor Deuteron POLarimeter DPOL. Large S
1
values are observed for the transitions to the isoscalar spin-flip states, such as the 12.71 MeV 1
+
state. S
2
has values close to zero for all the measured excitation energy region..
269. K. Krueger, C. Allgower, T. Kasprzyk, H. Spinka, D. Underwood, A. Yokosawa, G. Bunce, H. Huang, Y. Makdisi, T. Roser, M. Syphers, N. I. Belikov, A. A. Derevschikov, Yu A. Matulenko, L. V. Nogach, S. B. Nurushev, A. I. Pavlinov, A. N. Vasiliev, M. Bai, S. Y. Lee, Y. Goto, N. Hayashi, T. Ichihara, M. Okamura, N. Saito, H. En'yo, K. Imai, Y. Kondo, Y. Nakada, M. Nakamura, H. D. Sato, H. Okamura, H. Sakai, T. Wakasa, V. Baturine, A. Ogawa, V. Ghazikhanian, G. Igo, S. Trentalange, C. Whitten, Large analyzing power in inclusive π ± production at high X F with a 22-GeV / c polarized proton beam, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/S0370-2693(99)00677-2, 459, 1-3, 412-416, 1999.01, The analyzing power, AN, in inclusive charged-pion production has been measured using a ∼ 22-GeV/c transversely-polarized proton beam on a carbon target. A large AN was found for xF > 0.5 and for 0.6 T 1.2 GeV/c, with similar magnitudes and opposite sign for π+ and π-. This mirror behavior and the magnitudes are similar to π± production from 200-GeV/c polarized protons on a hydrogen target. The analyzing power for inclusive proton production has also been measured and is consistent with zero..
270. T. Uesaka, H. Sakai, H. Okamura, T. Ohnishi, Y. Satou, S. Ishida, N. Sakamoto, H. Otsu, Tomotsugu Wakasa, K. Itoh, K. Sekiguchi, T. Wakui, Polarization correlation coefficient for the 3He(d,p) 4He reaction, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/S0370-2693(99)01187-9, 467, 3-4, 199-204, 1999.01, A new approach to study the high momentum component of deuteron D-state wave function by measuring the polarization correlation coefficient, C// [= 1 + 1/4(Ayy + Axx) + 3/4(Cy,y + Cx,x)], for the 3He(d,p)4He reaction is proposed. The first measurement of C// has been carried out at Ed = 270 MeV by using a newly constructed spin-exchange-type polarized 3He target. The obtained value is 0.223 ± 0.044(statistical) ± 0.037(systematic). DWBA calculations are unable to reproduce the present results. Each component of C // is compared with data for the d+p backward scattering and the deuteron inclusive breakup. A similarity in polarization observables is found among these reactions..
271. Tomotsugu Wakasa, H. Sakai, K. Hatanaka, H. Okamura, H. Otsu, S. Fujita, T. Nonaka, T. Uesaka, Y. Satou, T. Ohnishi, G. Yokoyama, S. Ishida, N. Sakamoto, M. B. Greenfield, M. Ichimura, K. Kawahigashi, Polarization transfer and spin response functions in quasielastic [Formula Presented] reactions at 346 MeV, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.59.3177, 59, 6, 3177-3195, 1999.01, A complete set of polarization transfer coefficients has been measured for quasielastic [Formula Presented] reactions on [Formula Presented] [Formula Presented] and [Formula Presented] at a bombarding energy of 346 MeV and a laboratory scattering angle of [Formula Presented] The spin-longitudinal [Formula Presented] and spin-transverse [Formula Presented] response functions are extracted within a framework of a plane-wave impulse approximation with eikonal and optimal factorization approximations. The theoretically expected enhancement of [Formula Presented] is not observed. The observed [Formula Presented] is consistent with the pionic enhanced [Formula Presented] expected by random-phase approximation (RPA) calculations. On the contrary, a large excess of the observed [Formula Presented] is found in comparison with [Formula Presented] of the quasielastic electron scattering as well as of RPA calculations. This excess masks the effect of pionic correlations in [Formula Presented] The theoretical calculations are performed in a distorted-wave impulse approximation with RPA correlations, which indicates that the nuclear absorption effect depends on the spin direction. This spin-direction dependence is responsible in part for the excess of [Formula Presented].
272. T. Wakasa, H. Sakai, H. Okamura, H. Otsu, S. Fujita, S. Ishida, N. Sakamoto, T. Uesaka, Y. Satou, T. Nonaka, T. Ohnishi, M. B. Greenfield, K. Hatanaka, Performance of the neutron polarimeter NPOL2 for (p→,n→) polarization transfer measurements, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/S0168-9002(97)01149-2, 404, 2-3, 355-372, 1998.12, A high performance neutron polarimeter NPOL2 has been constructed to measure polarization transfer observables Dij for neutron kinetic energies of Tn = 150-400 MeV. The NPOL2 system consists of 6 planes of two-dimensional position-sensitive neutron detectors with a size of 1 × 1 × 0.1 m3. Neutron polarization is determined from the azimuthal distribution of the elastic n→ + p scattering in the scintillator material. The effective analyzing powers (Ayeff) of NPOL2 have been calibrated by using the polarized neutrons from the 0° 2H(p→,n→)pp reaction at Tp = 146, 228, 296, 346 and 392 MeV as well as by using the polarized neutrons from the 0° 6Li(p→,n→)6Be(g.s.) reaction at Tp = 228 MeV. The Ay;eff values of NPOL2 have reasonable values, typically 0.223 ± 0.012 and 0.132 ± 0.004 for (n→,n) and (n→,p) channels, respectively, at Tn = 291 MeV. The figure-of-merit value defined as εD.S.(Ay;eff)2 is over 4 × 10-4 for the wide neutron kinetic energy region of Tn = 200-400 MeV, where εD.S is the double scattering efficiency..
273. Ohnishi T, Sakai H, Okamura H, Ishida S, Otsu H, Sakamoto N, Uesaka T, Wakasa T, Satou Y, Fujita S, Nonaka T, Stephenson EJ, Measurement of a complete set of analyzing powers for deuteron elastic scattering from Ca-40 at 270 MeV and an investigation of tensor potentials, PHYSICS LETTERS B, 438 (1-2): 27-34 OCT 15 1998, 1998.10.
274. Okamura H, Ishida S, Sakamoto N, Otsu H, Uesaka T, Wakasa T, Sakai H, Niizeki T, Toyokawa H, Tajima Y, Ohnuma H, Yosoi M, Hatanaka K, Ichihara T, Mechanism of the forward-angle (d,pn) reaction at intermediate energies, PHYSICAL REVIEW C, 58 (4): 2180-2191 OCT 1998, 1998.10.
275. T. Ohnishi, H. Sakai, H. Okamura, S. Ishida, H. Otsu, N. Sakamoto, T. Uesaka, Tomotsugu Wakasa, Y. Satou, S. Fujita, T. Nonaka, E. J. Stephenson, Measurement of a complete set of analyzing powers for deuteron elastic scattering from 40Ca at 270 MeV and an investigation of tensor potentials, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/S0370-2693(98)01013-2, 438, 1-2, 27-34, 1998.10, The differential cross section and the analyzing powers, Ay, Ayy, Axx, and Axz, have been measured for polarized deuteron elastic scattering from 40Ca at 270 MeV. An optical model analysis reproduces the data with only central, spin-orbit, and TR tensor terms, and shows the importance of effects arising from the imaginary parts of the potential, in particular for Axx. No evidence is seen for either a TP or TL tensor potential..
276. Sakai H, Wakasa T, Nonaka T, Okamura H, Otsu H, Fujita S, Ishida S, Sakamoto N, Uesaka T, Satou Y, Ohnishi T, Yokoyama G, Ichimura M, Greenfield MB, Hatanaka K, Cross sections and complete polarization transfer measurements for the H-2((p)over-right-arrow,(p)over-right-arrow)pp reaction at 346 MeV, NUCLEAR PHYSICS A, 631: 757C-761C MAR 2 1998, 1998.05.
277. Okamura H, Ishida S, Sakamoto N, Otsu H, Uesaka T, Wakasa T, Satou Y, Sakai H, Niizeki T, Ohnuma H, Ichihara T, Detector system of the first focal plane of the spectrometer SMART at RIKEN, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 406 (1): 78-88 MAR 21 1998, 1998.05.
278. Wakasa T, Sakai H, Okamura H, Otsu H, Fujita S, Ishida S, Sakamoto N, Uesaka T, Satou Y, Greenfield MB, Hatanaka K, Strength observed in Gamow-Teller resonance plus continuum in the Al-27((p)over-right-arrow,(n)over-right-arrow) reaction at 295 MeV, PHYSICS LETTERS B, 426 (3-4): 257-262 MAY 7 1998, 1998.05.
279. Tomotsugu Wakasa, H. Sakai, H. Okamura, H. Otsu, S. Fujita, S. Ishida, N. Sakamoto, T. Uesaka, Y. Satou, M. B. Greenfield, K. Hatanaka, Strength observed in Gamow-Teller resonance plus continuum in the 27Al(p, n) reaction at 295 MeV, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/S0370-2693(98)00320-7, 426, 3-4, 257-262, 1998.05, The double differential cross sections for θlab between 0.0° and 14.7° and the polarization transfer coefficient DNN(0°) for the 27Al(p, n) reaction have been measured at a bombarding energy of 295 MeV. A multipole decomposition technique is applied for the cross section data to extract L = 0, 1, 2, and 3 contributions. The Gamow-Teller (GT) strength B(GT) deduced from the L = 0 contribution is compared with the B(GT) values calculated in a full sd shell-model space. The sum of B(GT) values up to 20 MeV excitation is Sβ = 4.0 ± 0.1 ± 0.1. A fairly large L = 0 contribution is observed in the continuum region up to 50 MeV, which could be in part ascribed to the quenched GT strength. A limit on the effect that the Δ(1232)-isobar nucleon-hole admixture has upon the GT strength is estimated..
280. Tostevin JA, Rugmai S, Johnson RC, Okamura H, Ishida S, Sakamoto N, Otsu H, Uesaka T, Wakasa T, Sakai H, Niizeki T, Toyokawa H, Tajima Y, Ohnuma H, Yosoi M, Hatanaka K, Ichihara T, Coulomb breakup of light composite nuclei, PHYSICS LETTERS B, 424 (3-4): 219-225 APR 9 1998, 1998.04.
281. J. A. Tostevin, S. Rugmai, R. C. Johnson, H. Okamura, S. Ishida, N. Sakamoto, H. Otsu, T. Uesaka, T. Wakasa, H. Sakai, T. Niizeki, H. Toyokawa, Y. Tajima, H. Ohnuma, M. Yosoi, K. Hatanaka, T. Ichihara, Coulomb breakup of light composite nuclei, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/S0370-2693(98)00228-7, 424, 3-4, 219-225, 1998.04, We present a new analysis of the Coulomb dissociation of nuclei comprising a charged core and one or more neutral valence particles at energies of tens of MeV/nucleon and above. The approach assumes only that excitation of the projectile is to the low energy continuum. A successful comparison is made with new high precision measurements of small angle deuteron dissociation at 140 MeV incident energy..
282. H. Sakai, Tomotsugu Wakasa, T. Nonaka, H. Okamura, H. Otsu, S. Fujita, S. Ishida, N. Sakamoto, T. Uesaka, Y. Satou, T. Ohnishi, G. Yokoyama, M. Ichimura, M. B. Greenfield, K. Hatanaka, Cross sections and complete polarization transfer measurements for the
2
H(p→, n→)pp reaction at 346 MeV, Nuclear Physics A, 631, 757-761, 1998.03, Cross sections and complete polarization transfer coefficients D
ij
for the charge-exchange
2
H(p→, n→)pp reaction have been measured at E
p
= 346 MeV and θ
lab
= 0° - 22°. In the forward angles the prominent narrow peak due to the strong
1
S
0
final state interaction (FSI) between the two residual protons is observed while at the large angles the broad bump due to the quasi-free scattering (QFS) becomes prominent. Characteristic features of FSI and QFS are well described by the simple plane-wave impulse approximation (PWIA) calculations..
283. H. Okamura, S. Ishida, N. Sakamoto, H. Otsu, T. Uesaka, T. Wakasa, Y. Satou, H. Sakai, T. Niizeki, H. Ohnuma, T. Ichihara, Detector system of the first focal plane of the spectrometer SMART at RIKEN, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/S0168-9002(97)01217-5, 406, 1, 78-88, 1998.03, A detector system of the first focal plane of SMART, the 135MeV/u high-resolution spectrometer at RIKEN Accelerator Research Facility, is described. It consists of a pair of multi-wire drift chambers and a trigger scintillator hodoscope contained in a He-filled detector box. A major subject using this system is the measurement of the (d,2He) reaction making the most of its large angular and momentum acceptances. Without seriously sacrificing the detection efficiency, reasonably good energy and angular resolutions for 2He, 460 keV and 9 mrad (FWHM), respectively, have been achieved after optimizing the optics property of the spectrometer..
284. Wakasa T, Sakai H, Okamura H, Otsu H, Fujita S, Ishida S, Sakamoto N, Uesaka T, Satou Y, Nonaka T, Ohnishi T, Greenfield MB, Hatanaka K, Performance of the neutron polarimeter NPOL2 for ((p)over-right-arrow,(n)over-right-arrow) polarization transfer measurements, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 404 (2-3): 355-372 FEB 21 1998, 1998.02.
285. Uesaka T, Wakui T, Ohnishi T, Okamura H, Satou Y, Ishida S, Sakamoto N, Otsu H, Wakasa T, Nonaka T, Yokoyama G, Itoh K, Sekiguchi K, Haruyama S, Ikeda T, Wakasugi M, Sakai H, Yano Y, Polarized He-3 project at RIKEN, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 402 (2-3): 212-217 JAN 11 1998, 1998.01.
286. Muraki Y, Matsubara Y, Imaida I, Koi T, Murata T, Okada A, Sakakibara S, Sako T, Tsuchiya H, Munakata Y, Shibata S, Tatsuoka R, Sakai H, Nonaka T, Ohnishi T, Wakasa T, Hatanaka K, Ishida Y, Solar flare and neutrino telescope, NUCLEAR PHYSICS B, 3-11 Suppl. 60B JAN 1998, 1998.01.
287. H. Okamura, S. Ishida, N. Sakamoto, H. Otsu, T. Uesaka, T. Wakasa, H. Sakai, T. Niizeki, H. Toyokawa, Y. Tajima, H. Ohnuma, M. Yosoi, K. Hatanaka, T. Ichihara, Mechanism of the forward-angle [Formula Presented] reaction at intermediate energies, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.58.2180, 58, 4, 2180-2191, 1998.01, The elastic breakup of the deuteron has been measured in a kinematical condition of [Formula Presented] at [Formula Presented] and 270 MeV on seven targets ranging from [Formula Presented] to 82. A double-peaked structure with its minimum at [Formula Presented] is observed for all the measured triple-differential cross sections, which indicates a large contribution from Coulomb breakup. While a symmetric shape is expected for an [Formula Presented] transition, the observed proton-energy distribution is asymmetric, showing considerable dependence on both the target and the incident energy. These data and previous data at 56 MeV have been analyzed using the post-form of the distorted-wave Born approximation (DWBA) theory. Although the calculations account reasonably well for the asymmetric shape, by including the nuclear potential, they consistently overestimate the magnitudes of the cross sections over the whole measured region. Limitations of the post-form DWBA are discussed..
288. T. Uesaka, T. Wakui, T. Ohnishi, H. Okamura, Y. Satou, S. Ishida, N. Sakamoto, H. Otsu, Tomotsugu Wakasa, T. Nonaka, G. Yokoyama, K. Itoh, K. Sekiguchi, S. Haruyama, T. Ikeda, M. Wakasugi, H. Sakai, Y. Yano, Polarized
3
He project at RIKEN, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/S0168-9002(97)00837-1, 402, 2-3, 212-217, 1998.01, A new approach to study the high momentum component of deuteron D-state wave function by measuring the polarization correlation coefficient, C
//
, for the
3
H

e(d

, p)
4
He reaction has been proposed. In order to carry out the experiment, a spin exchange type polarized
3
He target was constructed at RIKEN Accelerator Research Facility (RARF). The density of the target was 2.2 × 10
20
cm
-3
(8.2 amagats), and the polarization was about 10%. The spin flip system worked well. The experiment has been carried out in November, 1996, at RARF, using a polarized deuteron beam of 270 MeV..
289. Y. Muraki, Y. Matsubara, I. Imaida, T. Koi, T. Murata, A. Okada, S. Sakakibara, T. Sako, H. Tsuchiya, Y. Munakata, S. Shibata, R. Tatsuoka, H. Sakai, T. Nonaka, T. Ohnishi, T. Wakasa, K. Hatanaka, Y. Ishida, Solar flare and neutron telescope, Nuclear Physics B - Proceedings Supplements, 10.1016/S0920-5632(97)00496-9, 60, 3, 3-11, 1998.01, For the solar neutron event of June 3rd,1982, a new interpretation is given on ion acceleration mechanisms at the solar surface. The event can be explained by the impulsive acceleration of ions just after electron acceleration. For the June 4th,1991 solar neutron event, discrepancies in the absolute solar neutron fluxes measured by three different detectors are investigated using neutron beams at RCNP, Osaka university. We propose here an interpretation which explains all data consistently based on the premise that solar neutrons generate many low energy neutrons in the atmosphere by internuclear cascade processes..
290. Wakasa T, Sakai H, Okamura H, Otsu H, Fujita S, Ishida S, Sakamoto N, Uesaka T, Satou Y, Greenfield MB, Hatanaka K, Gamow-Teller strength of Nb-90 in the continuum studied via multipole decomposition analysis of the Zr-90(p,n) reaction at 295 MeV, PHYSICAL REVIEW C, 55 (6): 2909-2922 JUN 1997, 1997.06.
291. Tomotsugu Wakasa, H. Sakai, H. Okamura, H. Otsu, S. Fujita, S. Ishida, N. Sakamoto, T. Uesaka, Y. Satou, M. B. Greenfield, K. Hatanaka, Gamow-Teller strength of [Formula Presented]Nb in the continuum studied via multipole decomposition analysis of the [Formula Presented]Zr[Formula Presented] reaction at 295 MeV, Physical Review C - Nuclear Physics, 10.1103/PhysRevC.55.2909, 55, 6, 2909-2922, 1997.01, The double differential cross sections at [Formula Presented] between [Formula Presented] and [Formula Presented] and the polarization transfer [Formula Presented] at [Formula Presented] for the [Formula Presented] reaction are measured at a bombarding energy of 295 MeV. A multipole decomposition technique is applied to the cross sections to extract [Formula Presented], [Formula Presented], [Formula Presented], and [Formula Presented] contributions. The Gamow-Teller (GT) strength [Formula Presented] in the continuum deduced from the [Formula Presented] cross section is compared both with the perturbative calculation by Bertsch and Hamamoto and with the second-order random phase approximation calculation by Drożdż et al. The sum of [Formula Presented] values up to 50 MeV excitation becomes [Formula Presented]=28.0±1.6 after subtracting the contribution of the isovector spin-monopole strength. This [Formula Presented] value of 28.0[Formula Presented]1.6 corresponds to about (93 [Formula Presented] 5)% of the minimum value of the sum rule [Formula Presented]=30. The usefulness of the polarization transfer observable in the distorted wave impulse approximation is presented..
292. Wakasa T, Sakai H, Okamura H, Otsu H, Sakamoto N, Uesaka T, Satou Y, Fujita S, Ishida S, Greenfield MB, Koori N, Okihana A, Hatanaka K, Multipole decomposition analysis of the Al-27, Zr-90, Pb-208(p,n) reactions at 295 MeV, NUCLEAR PHYSICS A, 599 (1-2): C217-C222 MAR 18 1996, 1996.05.
293. Sakai H, Okamura H, Otsu H, Wakasa T, Fujita S, Sakamoto N, Uesaka T, Satou Y, Nonaka T, Oonishi T, Greenfield MB, Hatanaka K, Spin-isospin excitations studied by polarized beams, NUCLEAR PHYSICS A, 599 (1-2): C197-C210 MAR 18 1996, 1996.05.
294. Tomotsugu Wakasa, H. Sakai, H. Okamura, H. Otsu, N. Sakamoto, T. Uesaka, Y. Satou, S. Fujita, S. Ishida, M. B. Greenfield, N. Koori, A. Okihana, K. Hatanaka, Multipole decomposition analysis of the 27Al, 90Zr, 208Pb(p, n) reactions at 295 MeV, Nuclear Physics A, 599, 1-2, 1996.03, Differential cross sections at θlab between 0° and 15° and the polarization transfer DNN at zero degrees for the 27Al, 90Zr, 208Pb(p, n) reactions are measured at a bombarding energy of 295 MeV. A multipole decomposition (MD) technique is applied to extract L = 0, L = 1, and L ≥ 2 contributions to the cross sections. The summed Gamow-Teller strength B(GT) is compared with shell-model calculations for the 27Al(p, n) and 90Zr(p, n) reactions. The usefulness of the polarization transfer observable in the MD analysis is discussed..
295. H. Sakai, H. Okamura, H. Otsu, T. Wakasa, S. Fujita, N. Sakamoto, T. Uesaka, Y. Satou, T. Nonaka, T. Oonishi, S. Ishida, M. B. Greenfield, K. Hatanaka, Spin-isospin excitations studied by polarized beams, Nuclear Physics A, 10.1016/0375-9474(96)00062-0, 599, 1-2, 197C-210C, 1996.03, The spin-parity Jπ of the spin dipole resonances (SDR) in 12N and 12B are investigated via the measurements of polarization observables, the transverse polarization transfer coefficient DNN for the (p,n) reaction at 197 and 295 MeV and the tensor analyzing power Axx for the (d, 2He) reaction at 270 MeV. The polarization observables, DNN and Axx for the peak at 4.5 MeV are consistent with the DWIA prediction with 2- but those for the peak at 7.5 MeV contradict the predictions with an expected Jπ = 1-. Neither polarization observables could detect any concentration of 0- strength. The usefulness of these spin observables in identifying Jπ is shown..
296. Sakai H, Okamura H, Otsu H, Wakasa T, Ishida S, Sakamoto N, Uesaka T, Satou Y, Fujita S, Hatanaka K, Facility for the (p,n) polarization transfer measurement, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 369 (1): 120-134 JAN 21 1996, 1996.01.
297. H. Sakai, H. Okamura, H. Otsu, T. Wakasa, S. Ishida, N. Sakamoto, T. Uesaka, Y. Satou, S. Fujita, K. Hatanaka, Facility for the (p, n) polarization transfer measurement, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/0168-9002(95)00716-4, 369, 1, 120-134, 1996.01, We have designed and constructed a facility to measure the complete polarization transfer coefficient Dij for the (p, n) reaction at intermediate energies. The facility consists of a beam swinger dipole magnet used for angular distribution measurements and a 100 m tunnel for the neutron energy measurement by the time-of-flight method. Typical neutron energy resolution is about 1.85 MeV for 290 MeV neutrons including a contribution of 1 MeV due to the target thickness. The background associated with this tunnel system was carefully investigated and found to be negligibly small. A dipole magnet for the neutron spin rotation is installed in the neutron flight path to measure the longitudinal polarization as well as the induced polarization. The neutron polarimeter which consists of 6 planes of the two-dimensional position-sensitive neutron detectors with a size of 1 m × 1 m × 0.1 m has been constructed. Its effective left-right analyzing power 〈Aeffy〉 has been calibrated at 194, 290 and 384 MeV. The figure-of-merit value defined by 〈Aeffy2 × ∈DS at 290 MeV is 4.05 × 10-4, where ∈DS is the double scattering efficiency..
298. N. Sakamoto, H. Okamura, T. Uesaka, S. Ishida, H. Otsu, Tomotsugu Wakasa, Y. Satou, T. Niizeki, K. Katoh, T. Yamashita, K. Hatanaka, Y. Koike, H. Sakai, Measurement of the vector and tensor analyzing powers for the d-p elastic scattering at E
d
= 270 MeV, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/0370-2693(95)01398-9, 367, 1-4, 60-64, 1996.01, The differential cross sections and the vector and tensor analyzing powers A
y
, A
yy
, A
xx
, and A
xz
for the d-p elastic scattering were measured at E
lab
d
= 270 MeV over the c.m. angular range from 57° to 138°. The data are compared with a Faddeev calculation. A good description is obtained for all components of the analyzing powers, while a discrepancy of about 30% is found in the cross section around θ
c.m.
= 120°..
299. SAKAI H, AOYAMA T, FUJITAKA S, HARAKEH MN, KUBOTA K, OKAMURA H, OTSU H, SATOU Y, TANAKA M, UESAKA T, WAKASA T, SPIN-FLIP PROBABILITY VIA THE MG-26(HE-3,T-GAMMA)AL-26 REACTION, NUCLEAR PHYSICS A, 588 (2): 479-489 JUN 5 1995, 1995.06.
300. WAKASA T, SAKAI H, OKAMURA H, OTSU H, ISHIDA S, SAKAMOTO N, UESAKA T, SATOU Y, GREENFIELD MB, KOORI N, OKIHANA A, HATANAKA K, SPIN-FLIP STRENGTH IN THE CONTINUUM AND EFFECTIVE TENSOR INTERACTIONS VIA POLARIZATION TRANSFER D-NN(0-DEGREES) FOR ((P)OVER-RIGHT-ARROW,(N)OVER-RIGHT-ARROW) REACTIONS AT 295-MEV, PHYSICAL REVIEW C, 51 (6): R2871-R2875 JUN 1995, 1995.06.
301. H. Sakai, T. Aoyama, S. Fujitaka, M. N. Harakeh, K. Kubota, H. Okamura, H. Otsu, Y. Satou, M. Tanaka, T. Uesaka, Tomotsugu Wakasa, Spin-flip probability via the 26Mg(3He,tγ)26Al reaction, Nuclear Physics, Section A, 10.1016/0375-9474(95)00039-4, 588, 2, 479-489, 1995.06, The spin-flip probability for the charge-exchange reaction 26Mg(3He,tγ)26Al (1+; 1.06 MeV) has been measured at E = 53 MeV and θlab = 10°. The extracted value is 0.41 ± 0.04. A microscopic DWBA calculation with empirically determined effective interactions reproduces the observed cross sections fairly well but the spin-flip probability poorly. To supplement the (3He,tγ) study, the spin-flip probability has been measured for the same state by the charge-exchange (p,nγ) reaction at 35 MeV and θlab = 30° and found to be 0.52 ± 0.11. Though statistically not significant the lower value of S in the (3He,t) reaction may reflect on the more complex nature of this reaction at the present bombarding energy..
302. OKAMURA H, FUJITA S, HARA Y, HATANAKA K, ICHIHARA T, ISHIDA S, KATOH K, NIIZEKI T, OHNUMA H, OTSU H, SAKAI H, SAKAMOTO N, SATOU Y, UESAKA T, WAKASA T, YAMASHITA T, TENSOR ANALYZING POWER OF THE (D,HE-2)-REACTION AT 270-MEV, PHYSICS LETTERS B, 345 (1): 1-5 FEB 2 1995, 1995.02.
303. H. Okamura, S. Fujita, Y. Hara, K. Hatanaka, T. Ichihara, S. Ishida, K. Katoh, T. Niizeki, H. Ohnuma, H. Otsu, H. Sakai, N. Sakamoto, Y. Satou, T. Uesaka, Tomotsugu Wakasa, T. Yamashita, Tensor analyzing power of the (d,
2
He) reaction at 270 MeV, Physics Letters B, 10.1016/0370-2693(94)01607-E, 345, 1, 1-5, 1995.02, The tensor analyzing power of the (d,
2
He) reaction has been measured at 270 MeV. Its usefulness for spectroscopic studies, particularly in identifying the J
π
of spin-flip dipole states, is demonstrated for a
12
C target. The data are reasonably well reproduced in terms of the distorted-wave Born approximation theory for the three-body reaction..
304. Tomotsugu Wakasa, H. Sakai, H. Okamura, H. Otsu, S. Ishida, N. Sakamoto, T. Uesaka, Y. Satou, M. B. Greenfield, N. Koori, A. Okihana, K. Hatanaka, Spin-flip strength in the continuum and effective tensor interactions via polarization transfer DNN(0°) for (p→,n→) reactions at 295 MeV, Physical Review C, 10.1103/PhysRevC.51.R2871, 51, 6, 1995.01, The first measurements of DNN(0°) for (p→,n→) reactions at 295 MeV yield large negative values up to 50 MeV excitation for the Li6,11B,12C, C13(p→,n→) reactions, suggesting much stronger spin-flip strength than observed at lower bombarding energies. DWIA calculations using the Franey and Love (FL) 270 MeV interaction reproduce differential cross sections and DNN(0°) values, while the FL 325 MeV interaction yield DNN(0°) values less negative than the experimental values, suggesting that its exchange tensor part is too strong at large momentum transfer (Q3.4 fm-1)..
305. SAKAI H, GREENFIELD MB, HATANAKA K, ISHIDA S, KOORI N, OKAMURA H, OKIHANA A, OTSU H, SAKAMOTO N, SATOU Y, UESAKA T, WAKASA T, MEASUREMENTS OF QUASI-ELASTIC SCATTERING AND D-NN(0-DEGREES) WITH (P,N) REACTIONS, NUCLEAR PHYSICS A, 577 (1-2): C111-C121 SEP 19 1994, 1994.09.
306. NIIZEKI T, OHNUMA H, YAMAMOTO T, KATOH K, YAMASHITA T, HARA Y, OKAMURA H, SAKAI H, ISHIDA S, SAKAMOTO N, OTSU H, WAKASA T, UESAKA T, SATOU Y, FUJITA T, ICHIHARA T, ORIHARA H, TOYOKAWA H, HATANAKA K, KATO S, KUBONO S, YOSOI M, SPIN-ISOSPIN EXCITATION IN SD-SHELL NUCLEI STUDIED BY THE (D,HE-2) REACTION AT E(D)=270 MEV, NUCLEAR PHYSICS A, 577 (1-2): C37-C42 SEP 19 1994, 1994.09.
307. OKAMURA H, ISHIDA S, SAKAMOTO N, OTSU H, UESAKA T, WAKASA T, SATOH Y, FUJITA T, SAKAI H, NIIZEKI T, KATOH K, YAMAMOTO T, YAMASHITA T, HARA Y, OHNUMA H, ICHIHARA T, HATANAKA K, STUDY OF THE SPIN-DIPOLE STATE VIA THE ((D)OVER-RIGHT-ARROW,HE-2) REACTION AT 270 MEV, NUCLEAR PHYSICS A, 577 (1-2): C89-C92 SEP 19 1994, 1994.09.
308. H. Sakai, M. B. Greenfield, K. Hatanaka, S. Ishida, N. Koori, H. Okamura, A. Okihana, H. Otsu, N. Sakamoto, Y. Satou, T. Uesaka, Tomotsugu Wakasa, Measurements of quasi-elastic scattering and DNN(0°) with (p, n) reactions, Nuclear Physics, Section A, 10.1016/0375-9474(94)90843-5, 577, 1-2, 111-122, 1994.09, The quasi-elastic scattering (QES) process has been studied for the (p, n) reaction at 300 and 400 MeV. Energy spectra for targets ranging from 2H to natPb have been obtained for a wide range of scattering angles corresponding to momentum transfers q = 1.0 - 2.4 fm-1. Energy shift of the QES peak from that of 2H to higher excitation energy is observed for all targets studied, with a gradual increase with target mass reaching almost a constant value of ∼26 MeV beyond 12C. The mass dependence oo the effective neutron number (Neff) for the (p, n) QFS process is well represented by Neff = 0.85N0.5 over a wide mass range from 2H to natPb except for 6Li, 7Li and 9Be which deviate significantly. The analyzing powers of the QES peak region for the 12C and 40Ca targets are compared to those of the 2H(p, n) reaction at 300 and 400 MeV and found to be almost identical for q ≤ 1.5 fm-1. Transverse polarization transfer coefficients at 0 degree DNN(0°) have been measured for the 1p shell nuclei at 300 MeV. Large negative DNN(0°) values are observed for the continuum region up to an excitation energy of 50 MeV irrespective of targets. The DNN(0°) values observed for the GT transitions are around -0.28 which indicates the contribution from the tensor interactions. The DWIA calculations well reproduce the observed DNN(0°) values..
309. T. Niizeki, H. Ohnuma, T. Yamamoto, K. Katoh, T. Yamashita, Y. Hara, H. Okamura, H. Sakai, S. Ishida, N. Sakamoto, H. Otsu, T. Wakasa, T. Uesaka, Y. Satou, T. Fujita, T. Ichihara, H. Orihara, H. Toyokawa, K. Hatanaka, S. Kato, S. Kubono, M. Yosoi, Spin-isospin excitation in sd-shell nuclei studied by the (d, 2He) reaction at Ed = 270 MeV, Nuclear Physics, Section A, 10.1016/0375-9474(94)90831-1, 577, 1-2, 37-42, 1994.09, The (d,2He) reactions on 24Mg, 26Mg and 28Si were studied at Ed = 270 MeV. The 0o cross sections obtained for the 1+ states from the 24Mg,28Si(d,2He) reactions show a good correlation with those from the mirror (p,n) reactions. Four peaks were identified in the 26Mg(d,2He)26Ne reactions as being due to the 1+ excitation. The B(GT+) values for these transitions were estimated and compared with the shell model prediction..
310. H. Okamura, S. Ishida, N. Sakamoto, H. Otsu, T. Uesaka, T. Wakasa, Y. Satoh, T. Fujita, H. Sakai, T. Niizeki, K. Katoh, T. Yamamoto, T. Yamashita, Y. Hara, H. Ohnuma, T. Ichihara, K. Hatanaka, Study of the spin-dipole state via the (→d, 2He) reaction at 270 MeV, Nuclear Physics, Section A, 10.1016/0375-9474(94)90839-7, 577, 1-2, 89-92, 1994.09, It is theoretically shown that the tensor analyzing powers of the (→d, 2He) reaction contain essentially the same nuclear infrrmation as (→N, →N polarization transfer observables [1]. Considering its unique selectivities, ΔS =1, ΔT = 1 and ΔTZ = +1, the (→d, 2He) reaction should be a useful tool for the study of spin-dipole state, particularly in identifying Jπ (2-, 1- and 0-). To confirm this point experimentally, Axx, Ayy and Ay of the 12C(→d, 2He) 12B reaction have been measured at Ed = 270 MeV utilizing the newly constructed polarized ion source at RIKEN..