九州大学 研究者情報
論文一覧
吉岡 瑞樹(よしおか たまき) データ更新日:2022.06.13

准教授 /  先端素粒子物理研究センター


原著論文
1. Alex Keshavarzi, Kim Siang Khaw, Tamaki Yoshioka, Muon g − 2: A review, Nuclear Physics B, 10.1016/j.nuclphysb.2022.115675, 975, 2022.02, The muon magnetic anomaly, aμ=(gμ−2)/2, plays a special role in the history of the Standard Model (SM). Precise calculations and measurements of this fundamental quantity provide a stringent test of the SM and a window to the physics beyond. In light of the first result published by the Fermilab Muon g−2 experiment, this article reviews the current status of the experimental measurement and theoretical prediction of the muon anomalous magnetic moment. It also provides an overview on resulting constraints of associated physics beyond the SM (BSM), future muon g−2 experiments and on the progress of experiments that are closely connected to the physics of the muon g−2, such as measurements that could provide complementary information about BSM physics in the muon sector..
2. Shusuke Takada, Kenichiro Tateishi, Yasuo Wakabayashi, Yoshimasa Ikeda, Tamaki Yoshioka, Yoshie Otake, Tomohiro Uesaka, Polarized proton spin filter for epithermal neutrons based on dynamic nuclear polarization using photo-excited triplet electron spins, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 10.1093/ptep/ptaa111, 2020, 12, 2020.12, To polarize neutrons with energy beyond 0.1 eV, we developed a novel polarized proton spin filter based on dynamic nuclear polarization using photo-excited triplet electron spins. The spin filter consists of a single crystal of naphthalene doped with deuterated pentacene and has a size of empty set15 x 4 mm(3), allowing it to cover a wide beam diameter. It was operated in 0.35 T and at 90 K. We succeeded in polarizing neutrons in the energy range 0.1-10 eV using a RIKEN acceleratordriven compact neutron source. The averaged values of the proton and neutron polarization were 0.250 +/- 0.050 and 0.076 +/- 0.015, respectively..
3. S. Makise, S. Endo, H. Fujioka, K. Hirota, K. Ishizaki, A. Kimura, M. Kitaguchi, J. Koga, Y. Niinomi, T. Okudaira, K. Sakai, T. Shima, H. M. Shimizu, S. Takada, Y. Tani, T. Yamamoto, H. Yoshikawa, T. Yoshioka, Study of (gamma )-ray from 4.53 eV p-wave Resonance of 111Cd Using Compound Nuclear Reaction, Proceedings of the 3rd J-PARC Symposium (J-PARC2019), 10.7566/jpscp.33.011138, 2021.03.
4. J. Koga, S. Endo, H. Fujioka, K. Hirota, K. Ishizaki, A. Kimura, M. Kitaguchi, S. Makise, Y. Niinomi, T. Okudaira, K. Sakai, T. Shima, H. M. Shimizu, S. Takada, Y. Tani, T. Yamamoto, H. Yoshikawa, T. Yoshioka, Study for the Experimental Sensitivity of T-violation Search in Compound Nuclear Reaction of 117Sn, Proceedings of the 3rd J-PARC Symposium (J-PARC2019), 10.7566/jpscp.33.011137, 2021.03.
5. Hiromoto Yoshikawa, Shunsuke Endo, Hiroyuki Fujioka, Katsuya Hirota, Kohei Ishizaki, Atsushi Kimura, Masaaki Kitaguchi, Jun Koga, So Makise, Yudai Niinomi, Takuya Okudaira, Kenji Sakai, Tatsushi Shima, Hirohiko M. Shimizu, Shusuke Takada, Yuika Tani, Tomoki Yamamoto, Tamaki Yoshioka, S-wave Resonance Analysis of 139La and 109Ag in the Compound Nuclear Process Towards T-violation Search, Proceedings of the 3rd J-PARC Symposium (J-PARC2019), 10.7566/jpscp.33.011136, 2021.03.
6. S. Nishimura, H. A. Torii, Y. Fukao, T. U. Ito, M. Iwasaki, S. Kanda, K. Kawagoe, D. Kawall, N. Kawamura, N. Kurosawa, Y. Matsuda, T. Mibe, Y. Miyake, N. Saito, K. Sasaki, Y. Sato, S. Seo, P. Strasser, T. Suehara, K. S. Tanaka, T. Tanaka, J. Tojo, A. Toyoda, Y. Ueno, T. Yamanaka, T. Yamazaki, H. Yasuda, T. Yoshioka, K. Shimomura, Rabi-oscillation spectroscopy of the hyperfine structure of muonium atoms, Physical Review A, 10.1103/physreva.104.l020801, 104, 2, 2021.08.
7. Masayuki Hiromoto, Taichi Hori, Ryota Kondo, Shuhei Hara, Tatsushi Shima, Rintaro Nakabe, Noriko Oi, Hirohiko M. Shimizu, Katsuya Hirota, Masaaki Kitaguchi, Christopher C. Haddock, William M. Snow, Tamaki Yoshioka, Kenji Mishima, Takashi Ino, Proof-of-principle Experiment for the Study of a New Intermediate-range Interaction Using Coherent Neutron Scattering, Proceedings of the 3rd J-PARC Symposium (J-PARC2019), 10.7566/jpscp.33.011118, 2021.03.
8. N. Sumi, K. Hirota, G. Ichikawa, T. Ino, Y. Iwashita, S. Kajiwara, Y. Kato, M. Kitaguchi, K. Mishima, K. Morikawa, T. Mogi, H. Oide, H. Okabe, H. Otono, T. Shima, H. M. Shimizu, Y. Sugisawa, T. Tanabe, S. Yamashita, K. Yano, T. Yoshioka, Precise Neutron Lifetime Measurement Using Pulsed Neutron Beams at J-PARC, Proceedings of the 3rd J-PARC Symposium (J-PARC2019), 10.7566/jpscp.33.011056, 2021.03.
9. Takuya Okudaira, Shunsuke Endo, Hiroyuki Fujioka, Katsuya Hirota, Kohei Ishizaki, Atsushi Kimura, Masaaki Kitaguchi, Jun Koga, So Makise, Yudai Niinomi, Kenji Sakai, Tatsushi Shima, Hirohiko M. Shimizu, Shusuke Takada, Yuika Tani, Tomoki Yamamoto, Hiromoto Yoshikawa, Tamaki Yoshioka, Measurement of Angular Distributions of (gamma )-rays from 139La+n to Excited States of 140La, Proceedings of the 3rd J-PARC Symposium (J-PARC2019), 10.7566/jpscp.33.011121, 2021.03.
10. J. Koga, S. Takada, S. Endo, H. Fujioka, K. Hirota, K. Ishizaki, A. Kimura, M. Kitaguchi, Y. Niinomi, T. Okudaira, K. Sakai, T. Shima, H. M. Shimizu, Y. Tani, T. Yamamoto, H. Yoshikawa, T. Yoshioka, Angular distribution of γ rays from the p -wave resonance of Sn 118, Physical Review C, 10.1103/PhysRevC.105.054615, 105, 5, 2022.05, The neutron energy-dependent angular distribution of γ rays from the Sn117(n,γ) reaction was measured with germanium detectors and a pulsed neutron beam. The angular distribution was clearly observed in γ-ray emissions with an energy of 9327 keV which corresponds to the transition from a neutron resonance of Sn117+n to the ground state of Sn118. The angular distribution causes an angular-dependent asymmetric resonance shape. An asymmetry ALH was defined as (NL-NH)/(NL+NH), where NL and NH are integrated values for lower- and higher-energy regions of a neutron resonance, respectively. We found that the ALH has the angular dependence of (Acosθγ+B), where θγ is the γ-ray emission angle with respect to the incident neutron momentum, with A=0.394±0.073 and B=0.118±0.029 in the 1.33 eV p-wave resonance..
11. J. Koga, S. Ieki, A. Kimura, M. Kitaguchi, R. Kitahara, K. Mishima, N. Nagakura, T. Okudaira, H. Otono, H. M. Shimizu, N. Sumi, S. Takada, T. Tomita, T. Yamada, T. Yoshioka, Measurement of γ rays from 6LiF tile as an inner wall of a neutron-decay detector, Journal of Instrumentation, 10.1088/1748-0221/16/02/P02001, 16, 2, 2021.02, A neutron lifetime measurement conducted at the Japan Proton Accelerator Research Complex (J-PARC) is counting the number of electrons from neutron decays with a time projection chamber (TPC). The γ rays produced in the TPC cause irreducible background events. To achieve the precise measurement, the inner walls of the TPC consist of 6Li-enriched lithium-fluoride (6LiF) tiles to suppress the amount of γ rays. In order to estimate the amount of γ rays from the 6LiF tile, prompt gamma ray analysis (PGA) measurements were performed using germanium detectors. We reconstructed the measured γ-ray energy spectrum using a Monte Carlo simulation with the stripping method. Comparing the measured spectrum with a simulated one, the number of γ rays emitted from the6LiF tile was (2.3+0.7-0.3) × 10-4 per incident neutron. This is 1.4+0.5-0.2 times the value assumed for a mole fraction of the 6LiF tile. We concluded that the amount of γ rays produced from the 6LiF tile is not more twice the originally assumed value..
12. Kiichi Goto, Taikan Suehara, Tamaki Yoshioka, Masakazu Kurata, Hajime Nagahara, Yuta Nakashima, Noriko Takemura, Masako Iwasaki, Development of a Vertex Finding Algorithm using Recurrent Neural Network., CoRR, abs/2101.11906, 2021.01.
13. K. Hirota, G. Ichikawa, S. Ieki, T. Ino, Y. Iwashita, M. Kitaguchi, R. Kitahara, J. Koga, K. Mishima, T. Mogi, K. Morikawa, A. Morishita, N. Nagakura, H. Oide, H. Okabe, H. Otono, Y. Seki, D. Sekiba, T. Shima, H. M. Shimizu, N. Sumi, H. Sumino, T. Tomita, H. Uehara, T. Yamada, S. Yamashita, K. Yano, M. Yokohashi, T. Yoshioka, Neutron lifetime measurement with pulsed cold neutrons, Progress of Theoretical and Experimental Physics, 10.1093/ptep/ptaa169, 2020, 12, 2020.12, The neutron lifetime has been measured by comparing the decay rate with the reaction rate of 3He nuclei of a pulsed neutron beam from the spallation neutron source at the Japan Proton Accelerator Research Complex (J-PARC). The decay rate and the reaction rate were determined by simultaneously detecting electrons from the neutron decay and protons from the 3He(n,p)3H reaction using a gas chamber, the working gas of which contains diluted 3He. The measured neutron lifetime was 898 ± 10stat+15-18 sys s..
14. Hayato Takeshita, Yukinobu Watanabe, Keita Nakano, Seiya Manabe, Katsumi Aoki, Naoto Araki, Kosuke Yoshinami, Tadahiro Kin, Nobuhiro Shigyo, Jun Koga, So Makise, Tamaki Yoshioka, Masaomi Tanaka, Takashi Teranishi, Thick target neutron yields from LiF, C, Si, Ni, Mo, and Ta bombarded by 6.7 MeV/u deuterons, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2020.164582, 983, 2020.12, Double-differential thick target neutron yields from the bombardment of LiF, C, Si, Ni, Mo, and Ta targets by 6.7 MeV/u deuterons were measured at forward angles using an EJ-301 liquid organic scintillator. The neutron energy spectra were derived via an unfolding method using the FORIST code with the detector response function calculated using the SCINFUL-QMD code. The neutron energy spectra and total neutron yields at 0 from the deuteron incidences were compared with the previous data of triton incidences on LiF, Si, Ni, Mo, and Ta targets measured at the same incident energy per nucleon. The comparison revealed that deuterons yield more neutrons for low-Z targets than tritons, and less neutrons for high-Z targets. The measured neutron energy spectra were compared with model calculations using the DEUteron-induced Reaction Analysis Code System (DEURACS). DEURACS successfully reproduced the neutron spectra from all the targets. For the triton incidence, some calculation codes were benchmarked, with JQMD/GEM and CCONE yielding good agreement with the measured neutron spectra at 0 . ∘ ∘.
15. D. Boumediene, A. Pingault, M. Tytgat, B. Bilki, D. Northacker, Y. Onel, G. Cho, D. W. Kim, S. C. Lee, W. Park, S. Vallecorsa, Y. Deguchi, K. Kawagoe, Y. Miura, R. Mori, I. Sekiya, T. Suehara, T. Yoshioka, L. Caponetto, C. Combaret, R. Ete, G. Garillot, G. Grenier, J. C. Ianigro, T. Kurca, I. Laktineh, B. Liu, B. Li, N. Lumb, H. Mathez, L. Mirabito, A. Steen, E. Calvo Alamillo, M. C. Fouz, J. Marin, J. Navarrete, J. Puerta Pelayo, A. Verdugo, F. Corriveau, M. Chadeeva, M. Danilov, L. Emberger, C. Graf, L. M.S. De Silva, F. Simon, C. Winter, J. Bonis, D. Breton, P. Cornebise, A. Gallas, J. Jeglot, A. Irles, J. Maalmi, R. Pöschl, A. Thiebault, F. Richard, D. Zerwas, M. Anduze, V. Balagura, V. Boudry, J. C. Brient, E. Edy, F. Gastaldi, R. Guillaumat, F. Magniette, J. Nanni, H. Videau, S. Callier, F. Dulucq, Ch De La Taille, G. Martin-Chassard, L. Raux, N. Seguin-Moreau, J. Cvach, M. Janata, M. Kovalcuk, J. Kvasnicka, I. Polak, J. Smolik, V. Vrba, J. Zalesak, J. Zuklin, Y. Y. Duan, S. Li, J. Guo, J. F. Hu, F. Lagarde, Q. P. Shen, X. Wang, W. H. Wu, H. J. Yang, Y. F. Zhu, L. Emberger, C. Graf, F. Simon, C. Winter, Particle identification using Boosted Decision Trees in the Semi-Digital Hadronic Calorimeter prototype, Journal of Instrumentation, 10.1088/1748-0221/15/10/P10009, 15, 10, 2020.10, The CALICE Semi-Digital Hadronic CALorimeter (SDHCAL) prototype using Glass Resistive Plate Chambers as a sensitive medium is the first technological prototype of a family of high-granularity calorimeters developed by the CALICE collaboration to equip the experiments of future leptonic colliders. It was exposed to beams of hadrons, electrons and muons several times in the CERN PS and SPS beamlines between 2012 and 2018. We present here a new method of particle identification within the SDHCAL using the Boosted Decision Trees (BDT) method applied to the data collected in 2015. The performance of the method is tested first with Geant4-based simulated events and then on the data collected by the SDHCAL in the energy range between 10 and 80 GeV with 10 GeV energy steps. The BDT method is then used to reject the electrons and muons that contaminate the SPS hadron beams. The rejection power of the new method is estimated to be as high as 99.0% for the muons and 99.4% for the electrons associated to a pion selection efficiency of about 95.0%..
16. Tetsuichi Kishishita, Yutaro Sato, Yoichi Fujita, Eitaro Hamada, Tsutomu Mibe, Tsubasa Nagasawa, Shohei Shirabe, Masayoshi Shoji, Taikan Suehara, Manobu M. Tanaka, Junji Tojo, Yuki Tsutumi, Takashi Yamanaka, Tamaki Yoshioka, SliT: A Strip-Sensor Readout Chip with Subnanosecond Time Walk for the J-PARC Muon g - 2/EDM Experiment, IEEE Transactions on Nuclear Science, 10.1109/TNS.2020.3012924, 67, 9, 2089-2095, 2020.09, A new silicon-strip readout chip named 'SliT' has been developed for the measurement of the muon anomalous magnetic moment and electric dipole moment (EDM) of the muon at Japan Proton Accelerator Research Complex (J-PARC). The SliT chip is designed in the Silterra 180-nm CMOS technology with mixed-signal integrated circuits. An analog circuit incorporates a conventional charge-sensitive amplifier, shaping amplifiers, and two distinct discriminators for each of the 128 identical channels. A digital part includes storage memories, an event building block, a serializer, and low voltage differential signaling (LVDS) drivers. A distinct feature of the SliT is utilization of the zero-crossing architecture, which consists of a CR- RC filter followed by a CR circuit as a voltage differentiator. This architecture allows generating hit signals with subnanosecond amplitude-independent time walk, which is the primary requirement for the experiment. The test results show a time walk of 0.38 ± 0.16 ns between 0.5 and 3 MIP signals. The equivalent noise charge is 1547± 75 e- (rms) at Cdet =33 pF as a strip-sensor capacitance. SliT128C satisfies all requirements of the J-PARC muon g-2 /EDM experiment..
17. Yutaro Sato, Yowichi Fujita, Eitaro Hamada, Tetsuichi Kishishita, Tsutomu Mibe, Osamu Sasaki, Masayoshi Shoji, Taikan Suehara, Manobu Tanaka, Junji Tojo, Tuki Tsutsumi, Takashi Yamanaka, Tamaki Yoshioka, Development of a front-end ASIC for silicon-strip detectors of the J-PARC muon g−2/EDM experiment, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2020.164035, 969, 2020.07, A front-end application specific integrated circuit (ASIC) with high rate capability and deep memory buffer is needed for the silicon-strip detector for the J-PARC muon g−2/EDM experiment. In this experiment, we reconstruct a positron track from muon decay by the silicon-strip detector and measure the muon anomalous magnetic moment and the electric dipole moment precisely to explore new physics beyond the Standard Model. The front-end ASIC is required to tolerate hit rates of 1.4 MHz per strip, to be stable to the change of hit rate by a factor of 150 from the beginning to the end of the measurement, and to have deep memory for the period of 40μs with 5 ns time resolution. To satisfy the experimental requirements, we designed a prototype ASIC “SliT128B” with the Silterra 180 nm CMOS technology. We report on the design and the performance of the SliT128B..
18. T. Yamamoto, T. Okudaira, S. Endo, H. Fujioka, K. Hirota, T. Ino, K. Ishizaki, A. Kimura, M. Kitaguchi, J. Koga, S. Makise, Y. Niinomi, T. Oku, K. Sakai, T. Shima, H. M. Shimizu, S. Takada, Y. Tani, H. Yoshikawa, T. Yoshioka, Transverse asymmetry of γ rays from neutron-induced compound states of La 140, Physical Review C, 10.1103/PhysRevC.101.064624, 101, 6, 2020.06, An sp-mixing model, which describes a compound nuclear reaction by mixing partial waves, predicts a correlation term in this reaction. A detailed study of the sp-mixing model is required to study the feasibility of a new type of time reversal symmetry violation search experiment. The correlation term σn·(kn×kγ) in the La139(n - ,γ) reaction has been studied by measuring γ-ray and neutron energies utilizing epithermal polarized neutrons and germanium detectors. The transverse asymmetry for single γ-ray transition was measured to be 0.60±0.19 in the p-wave resonance..
19. Y. Uesugi, R. Mori, H. Yamashiro, T. Suehara, T. Yoshioka, K. Kawagoe, Study of position sensitive silicon detector (PSD) for SiW-ECAL at ILC, Journal of Instrumentation, 10.1088/1748-0221/15/05/C05033, 15, 5, 2020.05, For the past few years we have been developing position sensitive silicon detectors (PSDs) which have an electrode at each of four corners so that incident position of a charged particle can be obtained with signal from the electrodes. It is expected that the position resolution of the silicon-tungsten electromagnetic calorimeter (SiW-ECAL) of the International Large Detector (ILD) will be improved by introducing PSDs to detection layers. In the previous production we found that the charge separation is not optimal due to the readout impedance. To solve the issue, we produced new PSDs with higher surface resistance with an additional resistive layer on the surface. We also implemented several techniques to decrease position distortion and increase signal-to-noise ratio which are essential for optimal position resolution. We present first measurements of the performance of one new PSD using a strontium 90 source, and using the Skiroc2-CMS ASIC..
20. Y. Deguchi, K. Kawagoe, R. Mori, E. Mestre, T. Suehara, T. Yoshioka, Study of silicon sensors for precise timing measurement, Journal of Instrumentation, 10.1088/1748-0221/15/05/C05051, 15, 5, 2020.05, Silicon sensors with high timing resolution can help particle identification in the International Linear Collider (ILC). We are studying Low Gain Avalanche Detectors (LGADs) as a sensor with high timing resolution. As a step to develop LGADs we are now characterizing Avalanche Photo Diodes (APDs), which have similar multiplication structure as LGADs. Particles from radioisotopes are used for studies in this paper..
21. T. Aoyagi, Y. Honda, H. Ikeda, M. Ikeno, K. Kawagoe, T. Kohriki, T. Kume, T. Mibe, K. Namba, S. Nishimura, N. Saito, O. Sasaki, N. Sato, Y. Sato, H. Sendai, K. Shimomura, S. Shirabe, M. Shoji, T. Suda, T. Suehara, T. Takatomi, M. Tanaka, J. Tojo, K. Tsukada, T. Uchida, T. Ushizawa, H. Wauke, T. Yamanaka, T. Yoshioka, Performance evaluation of a silicon strip detector for positrons/electrons from a pulsed a muon beam, Journal of Instrumentation, 10.1088/1748-0221/15/04/P04027, 15, 4, 2020.04, A high-intensity pulsed muon beam is becoming available at the at the Japan Proton Accelerator Research Complex (J-PARC). Many experiments to study fundamental physics using this high-intensity muon beam are proposed. An experiment to measure the muon magnetic moment anomaly (g-2) and the muon electric dipole moment (EDM) is one of these experiments and it requires a tracking detector for positrons from muon decay. Fine segmentation is required in a detector to tolerate the high rate of positrons. The time resolution is required to be much better than the muon anomalous spin precession period while a buffer depth of a front-end electronics needs to be much longer than the accelerated muon lifetime. Requirements of this detector also meet requirements of a measurement of the muonium hyperfine structure interval at the J-PARC and another experiment to measure the proton charge radius at Tohoku University. We have developed a single-sided silicon strip sensor with a 190 μm pitch, a front-end electronics with a sampling rate of 200 MHz and a buffer memory depth of 8192, and a data acquisition system based on DAQ-Middleware for the J-PARC muon g-2/EDM experiment. We have fabricated detector modules consisting of this sensor and the front-end electronics. Performance of fabricated detector modules was evaluated at a laboratory and a beam test using the positron beam at Tohoku University. The detector is confirmed to satisfy all requirements of the experiments except for the time walk, which will be solved by the next version of a front-end electronics..
22. T. Yamanaka, T. Aoyagi, H. Ikeda, M. Ikeno, T. Ito, K. Ueno, T. Uchida, K. Kawagoe, T. Kishishita, T. Kume, T. Kohriki, N. Saito, O. Sasaki, T. Sata, N. Sato, Y. Sato, M. Shoji, S. Shirabe, T. Suehara, Y. Sue, T. Suda, H. Sendai, T. Takatomi, M. Tanaka, K. Tsukada, Y. Tsutsumi, J. Tojo, K. Namba, S. Nishimura, Y. Honda, M. Matama, T. Mibe, T. Murakami, H. Yasuda, T. Yoshioka, Positron tracking detector for J-PARC muon g−2/EDM experiment, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2019.162786, 958, 2020.04, The positron tracking detector is developed for the J-PARC muon g−2/EDM (E34) experiment. It uses silicon strip sensors for positron detection and signals from sensors are transferred to the front-end readout system via flexible printed circuits (FPCs) glued on the sensors. The front-end readout system consists of application specific integrated circuits (ASICs) on FPCs and the field-programmable gate array (FPGA)-based readout board. Mass production of silicon strip sensors is ongoing. Designs of the FPC on the sensor and the front-end ASIC were fixed and their mass production has been started. Development of other detector components are also ongoing. The status of these developments and fabrications are presented..
23. R. Abramishvili, G. Adamov, R. R. Akhmetshin, A. Allin, J. C. Angélique, V. Anishchik, M. Aoki, D. Aznabayev, I. Bagaturia, G. Ban, Y. Ban, D. Bauer, D. Baygarashev, A. E. Bondar, C. Cârloganu, B. Carniol, T. T. Chau, J. K. Chen, S. J. Chen, Y. E. Cheung, W. Da Silva, P. D. Dauncey, C. Densham, G. Devidze, P. Dornan, A. Drutskoy, V. Duginov, Y. Eguchi, L. B. Epshteyn, P. Evtoukhovitch, S. Fayer, G. V. Fedotovich, M. Finger, M. Finger, Y. Fujii, Y. Fukao, J. L. Gabriel, P. Gay, E. Gillies, D. N. Grigoriev, K. Gritsay, V. H. Hai, E. Hamada, I. H. Hashim, S. Hashimoto, O. Hayashi, T. Hayashi, T. Hiasa, Z. A. Ibrahim, Y. Igarashi, F. V. Ignatov, M. Iio, K. Ishibashi, A. Issadykov, T. Itahashi, A. Jansen, X. S. Jiang, P. Jonsson, T. Kachelhoffer, V. Kalinnikov, E. Kaneva, F. Kapusta, H. Katayama, K. Kawagoe, R. Kawashima, N. Kazak, V. F. Kazanin, O. Kemularia, A. Khvedelidze, M. Koike, T. Kormoll, G. A. Kozlov, A. N. Kozyrev, M. Kravchenko, B. Krikler, G. Kumsiashvili, Y. Kuno, Y. Kuriyama, Y. Kurochkin, A. Kurup, B. Lagrange, J. Lai, M. J. Lee, H. B. Li, R. P. Litchfield, W. G. Li, T. Loan, D. Lomidze, I. Lomidze, P. Loveridge, G. Macharashvili, Y. Makida, Y. J. Mao, O. Markin, Y. Matsuda, A. Melkadze, A. Melnik, T. Mibe, S. Mihara, N. Miyamoto, COMET Phase-I technical design report, Progress of Theoretical and Experimental Physics, 10.1093/ptep/ptz125, 2020, 3, 2020.03, The Technical Design for the COMET Phase-I experiment is presented in this paper. COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the field of an aluminum nucleus (μ-e conversion, μ N → e N); a lepton flavor-violating process. The experimental sensitivity goal for this process in the Phase-I experiment is 3.1 × 10 , or 90% upper limit of a branching ratio of 7 × 10 , which is a factor of 100 improvement over the existing limit. The expected number of background events is 0.032. To achieve the target sensitivity and background level, the 3.2 kW 8 GeV proton beam from J-PARC will be used. Two types of detectors, CyDet and StrECAL, will be used for detecting the μ-e conversion events, and for measuring the beam-related background events in view of the Phase-II experiment, respectively. Results from simulation on signal and background estimations are also described. - - -15 -15.
24. K. Kawagoe, Y. Miura, I. Sekiya, T. Suehara, T. Yoshioka, S. Bilokin, J. Bonis, P. Cornebise, A. Gallas, A. Irles, R. Pöschl, F. Richard, A. Thiebault, D. Zerwas, M. Anduze, V. Balagura, V. Boudry, J. C. Brient, E. Edy, G. Fayolle, M. Frotin, F. Gastaldi, R. Guillaumat, A. Lobanov, M. Louzir, F. Magniette, J. Nanni, M. Rubio-Roy, K. Shpak, H. Videau, D. Yu, S. Callier, F. Dulucq, Ch de la Taille, N. Seguin-Moreau, J. E. Augustin, R. Cornat, J. David, P. Ghislain, D. Lacour, L. Lavergne, J. M. Parraud, J. S. Chai, D. Jeans, Beam test performance of the highly granular SiW-ECAL technological prototype for the ILC, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2019.162969, 950, 2020.01, The technological prototype of the CALICE highly granular silicon–tungsten electromagnetic calorimeter (SiW-ECAL) was tested in a beam at DESY in 2017. The setup comprised seven layers of silicon sensors. Each layer comprised four sensors, with each sensor containing an array of 256 5.5×5.5 mm silicon PIN diodes. The four sensors covered a total area of 18 × 18 cm and comprised a total of 1024 channels. The readout was split into a trigger line and a charge signal line. Key performance results for signal over noise for the two output lines are presented, together with a study of the uniformity of the detector response. Measurements of the response to electrons for the tungsten loaded version of the detector are also presented. 2.
25. Takuya Okudaira, Hirohiko M. Shimizu, Masaaki Kitaguchi, Katsuya Hirota, Christopher C. Haddock, Ikuya Ito, Tomoki Yamamoto, Shunsuke Endo, Kohei Ishizaki, Takumi Sato, Shusuke Takada, Jun Koga, Tamaki Yoshioka, Takashi Ino, Kouichiro Asahi, Takamasa Momose, Takahiro Iwata, Takayuki Oku, Kenji Sakai, Atsushi Kimura, Taro Nakao, Masanori Hino, Tatsushi Shima, Yutaka Yamagata, Measurement of the angular distribution of γ-rays after neutron capture by 139La for a T-violation search, EPJ Web of Conferences, 10.1051/epjconf/201921909001, 2019.12.
26. G. Eigen, T. Price, N. K. Watson, A. Winter, Y. Do, A. Khan, D. Kim, G. C. Blazey, A. Dyshkant, K. Francis, V. Zutshi, K. Kawagoe, Y. Miura, R. Mori, I. Sekiya, T. Suehara, T. Yoshioka, J. Apostolakis, J. Giraud, D. Grondin, J. Y. Hostachy, O. Bach, V. Bocharnikov, E. Brianne, K. Gadow, P. Göttlicher, O. Hartbrich, D. Heuchel, F. Krivan, K. Krüger, J. Kvasnicka, S. Lu, O. Pinto, A. Provenza, M. Reinecke, F. Sefkow, S. Schuwalow, Y. Sudo, H. L. Tran, P. Buhmann, E. Garutti, S. Laurien, D. Lomidze, M. Matysek, G. W. Wilson, D. Belver, E. Calvo Alamillo, M. C. Fouz, H. García Cabrera, J. Marín, J. Navarrete, J. Puerta Pelayo, A. Verdugo, L. Masetti, M. Chadeeva, M. Danilov, M. Gabriel, L. Emberger, C. Graf, Y. Israeli, F. Simon, M. Szalay, H. Windel, M. S. Amjad, S. Bilokin, J. Bonis, D. Breton, P. Cornebise, P. Doublet, A. Gallas, J. Jeglot, A. Irles, H. Li, J. Maalmi, R. Pöschl, A. Thiebault, F. Richard, D. Zerwas, M. Anduze, V. Balagura, E. Becheva, V. Boudry, J. C. Brient, R. Cornat, E. Edy, G. Fayolle, F. Gastaldi, H. Videau, S. Callier, F. Dulucq, Ch de la Taille, G. Martin-Chassard, L. Raux, N. Seguin-Moreau, J. Cvach, M. Janata, M. Kovalcuk, I. Polak, J. Smolik, V. Vrba, Characterisation of different stages of hadronic showers using the CALICE Si-W ECAL physics prototype, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2019.04.111, 937, 41-52, 2019.09, A detailed investigation of hadronic interactions is performed using π -mesons with energies in the range 2–10 GeV incident on a high granularity silicon–tungsten electromagnetic calorimeter. The data were recorded at FNAL in 2008. The region in which the π -mesons interact with the detector material and the produced secondary particles are characterised using a novel track-finding algorithm that reconstructs tracks within hadronic showers in a calorimeter in the absence of a magnetic field. The principle of carrying out detector monitoring and calibration using secondary tracks is also demonstrated. − −.
27. R. Kitahara, K. Hirota, S. Ieki, T. Ino, Y. Iwashita, M. Kitaguchi, J. Koga, K. Mishima, A. Morishita, N. Nagakura, H. Oide, H. Otono, Y. Seki, D. Sekiba, T. Shima, H. M. Shimizu, N. Sumi, H. Sumino, K. Taketani, T. Tomita, T. Yamada, S. Yamashita, M. Yokohashi, T. Yoshioka, Improved accuracy in the determination of the thermal cross section of 14N(n, p) 14C for neutron lifetime measurement, Progress of Theoretical and Experimental Physics, 10.1093/ptep/ptz096, 2019, 9, 2019.09, In a neutron lifetime measurement at the Japan Proton Accelerator Complex, the neutron lifetime is calculated from the neutron decay rate and the incident neutron flux. The flux is obtained by counting the protons emitted from the neutron absorption reaction of He gas, which is diluted in a mixture of working gas in a detector. Hence, it is crucial to determine the amount of He in the mixture. In order to improve the accuracy of the number density of the He nuclei, we have suggested using the N(n, p) C reaction as a reference because this reaction involves similar kinetic energy to the He(n,p) H reaction and a smaller reaction cross section to introduce reasonable large partial pressure. The uncertainty of the recommended value of the cross section, however, is not satisfied with our requirement. In this paper we report the most accurate experimental value of the cross section of the N(n,p) C reaction at a neutron velocity of 2200 m s , measured relative to the He(n,p) H reaction. The result was 1.868 pm 0.003 (stat.) ± 0.006 (sys.) b. Additionally, the cross section of the O(n,α) C reaction at the neutron velocity is also redetermined as 249 ± 6 mb. 3 3 3 14 14 3 3 14 14 -1 3 3 17 14.
28. M. Abe, S. Bae, G. Beer, G. Bunce, H. Choi, S. Choi, M. Chung, W. Da Silva, S. Eidelman, M. Finger, Y. Fukao, T. Fukuyama, S. Haciomeroglu, K. Hasegawa, K. Hayasaka, N. Hayashizaki, H. Hisamatsu, T. Iijima, H. Iinuma, H. Ikeda, M. Ikeno, K. Inami, K. Ishida, T. Itahashi, M. Iwasaki, Y. Iwashita, Y. Iwata, R. Kadono, S. Kamal, T. Kamitani, S. Kanda, F. Kapusta, K. Kawagoe, N. Kawamura, B. Kim, Y. Kim, T. Kishishita, R. Kitamura, H. Ko, T. Kohriki, Y. Kondo, T. Kume, M. J. Lee, S. Lee, W. Lee, G. M. Marshall, Y. Matsuda, T. Mibe, Y. Miyake, T. Murakami, K. Nagamine, H. Nakayama, S. Nishimura, D. Nomura, T. Ogitsu, S. Ohsawa, K. Oide, Y. Oishi, S. Okada, A. Olin, Z. Omarov, M. Otani, G. Razuvaev, A. Rehman, N. Saito, N. F. Saito, K. Sasaki, O. Sasaki, N. Sato, Y. Sato, Y. K. Semertzidis, H. Sendai, Y. Shatunov, K. Shimomura, M. Shoji, B. Shwartz, P. Strasser, Y. Sue, T. Suehara, C. Sung, K. Suzuki, T. Takatomi, M. Tanaka, J. Tojo, Y. Tsutsumi, T. Uchida, K. Ueno, S. Wada, E. Won, H. Yamaguchi, T. Yamanaka, A. Yamamoto, T. Yamazaki, H. Yasuda, M. Yoshida, T. Yoshioka, A new approach for measuring the muon anomalous magnetic moment and electric dipole moment, Progress of Theoretical and Experimental Physics, 10.1093/ptep/ptz030, 2019, 5, 2019.05, This paper introduces a new approach to measure the muon magnetic moment anomaly aμ = (g - 2)/2 and the muon electric dipole moment (EDM) dμ at the J-PARC muon facility. The goal of our experiment is to measure aμ and dμ using an independent method with a factor of 10 lower muon momentum, and a factor of 20 smaller diameter storage-ring solenoid compared with previous and ongoing muon g - 2 experiments with unprecedented quality of the storage magnetic field. Additional significant differences from the present experimental method include a factor of 1000 smaller transverse emittance of the muon beam (reaccelerated thermal muon beam), its efficient vertical injection into the solenoid, and tracking each decay positron from muon decay to obtain its momentum vector. The precision goal for aμ is a statistical uncertainty of 450 parts per billion (ppb), similar to the present experimental uncertainty, and a systematic uncertainty less than 70 ppb. The goal for EDM is a sensitivity of 1.5 × 10 ecm. -21.
29. Yutaro Sato, Masahiro Ikeno, Tetsuichi Kishishita, Takashi Kohriki, Tatsuya Kume, Tsutomu Mibe, Takeshi Murakami, Naohito Saito, Osamu Sasaki, Nobuhiko Sato, Hiroshi Sendai, Masayoshi Shoji, Toshikazu Takatomi, Manobu Tanaka, Tomohisa Uchida, Kazuki Ueno, Hirokazu Ikeda, Takumi Ito, Kiyotomo Kawagoe, Masato Matama, Shohei Shirabe, Taikan Suehara, Junji Tojo, Yuki Tsutsumi, Takashi Yamanaka, Tamaki Yoshioka, Shoichiro Nishimura, Hiromasa Yasuda, Development of silicon strip detector for J-PARC muon g-2/EDM experiment, Proceedings of Science, 340, 2019.01, The muon anomalous magnetic moment (g−2) and electric dipole moment (EDM) are sensitive to new physics beyond the Standard Model. We aim to measure (g−2) with a precision of 0.1 parts per million and search for EDM with a sensitivity of 10 e·cm at J-PARC. In this experiment, we use a silicon strip detector with high granularity and fast response to detect positrons from muon decay. We report on the development status of the silicon strip detector. µ µ − 21.
30. P. Strasser, M. Abe, M. Aoki, S. Choi, Y. Fukao, Y. Higashi, T. Higuchi, H. Iinuma, Y. Ikedo, K. Ishida, T. Ito, T. U. Ito, M. Iwasaki, R. Kadono, O. Kamigaito, S. Kanda, K. Kawagoe, D. Kawall, N. Kawamura, M. Kitaguchi, A. Koda, K. M. Kojima, K. Kubo, M. Matama, Y. Matsuda, Y. Matsudate, T. Mibe, Y. Miyake, T. Mizutani, K. Nagamine, S. Nishimura, T. Ogitsu, N. Saito, K. Sasaki, S. Seo, H. M. Shimizu, K. Shimomura, T. Suehara, M. Tajima, K. S. Tanaka, T. Tanaka, J. Tojo, D. Tomono, H. A. Torii, E. Torikai, A. Toyoda, Y. Tsutsumi, K. Ueno, Y. Ueno, D. Yagi, A. Yamamoto, T. Yamanaka, T. Yamazaki, H. Yasuda, M. Yoshida, T. Yoshioka, New precise measurements of muonium hyperfine structure at J-PARC MUSE, EPJ Web of Conferences (in press), 2019.01.
31. Y. Uesugi, H. Yamashiro, T. Suehara, T. Yoshioka, K. Kawagoe, Quark charge identification for e+e to qq¯ study, 2018 International Workshop on Future Linear Colliders, LCWS 2018, 2019.01, The process e e → qq¯ plays an important role in electroweak precision measurements. We are studying this process with ILD full simulation. The key for the reconstruction of the quark pair final states is quark charge identification (ID). We report the progress of charge ID study in detail. In particular, we investigate the performance of the charge ID for each decay mode of the heavy hadrons to know the possibilities of improvements of the charge ID. + −.
32. Yuto Deguchi, Hiroaki Yamashiro, Taikan Suehara, Tamaki Yoshioka, Keisuke Fujii, Kiyotomo Kawagoe, Study of fermion pair events at the 250 GeV ILC, 2018 International Workshop on Future Linear Colliders, LCWS 2018, 2019.01, Precise measurements of electroweak processes at the International Linear Collider (ILC) will provide unique opportunities to explore new physics beyond the Standard Model. Fermion pair production events are sensitive to new interactions involving a new heavy gauge boson or an electroweak interacting massive particle (EWIMP).We studied the mass reach of new particles at the ILC with s = 250 GeV by using e e → e e and e e → µ µ events. We show that a mass reach for BSM particles can be determined with 90% confidence level using a toy Monte Carlo technique. + − + − + − + −.
33. T. Yamamoto, H. M. Shimizu, K. Ishizaki, Y. Niinomi, M. Kitaguchi, S. Takada, J. Koga, S. Makise, T. Yoshioka, A. Kimura, K. Sakai, T. Oku, T. Okudaira, S. Endo, Y. Tani, H. Fujioka, H. Yoshikawa, K. Hirota, T. Shima, Verification of the compound nuclear model for T-violation search, Proceedings of Science, 10.22323/1.356.0042, 356, 2019.01, Large sources of parity violation have been observed in compound nuclear reactions. These enhancements are described by the compound nuclear model, which can be used to describe the angular correlation of γ-rays produced in (n; γ) reactions in medium-heavy nuclei. It has also been suggested that these same reactions could lead to a similar enhancement in time reversal violating processes. Therefore, we are interested in verifying the compound nuclear model by studying the (n; γ) reaction using polarized neutrons. In this paper, we discuss the installation and characterization of a neutron polarizer used in the (n; γ) measurement with transversely polarized neutrons..
34. J. Repond, L. Xia, J. Apostolakis, G. Folger, V. Ivantchenko, A. Ribon, V. Uzhinskiy, D. Boumediene, V. Francais, G. C. Blazey, A. Dyshkant, K. Francis, V. Zutshi, O. Bach, E. Brianne, A. Ebrahimi, K. Gadow, P. Göttlicher, O. Hartbrich, F. Krivan, K. Krüger, J. Kvasnicka, S. Lu, C. Neubüser, A. Provenza, M. Reinecke, F. Sefkow, S. Schuwalow, Y. Sudo, H. L. Tran, P. Buhmann, E. Garutti, S. Laurien, D. Lomidze, M. Matysek, A. Kaplan, H. Ch Schultz-Coulon, G. W. Wilson, D. Jeans, K. Kawagoe, I. Sekiya, T. Suehara, H. Yamashiro, T. Yoshioka, M. Wing, K. Kotera, M. Nishiyama, T. Sakuma, T. Takeshita, S. Tozuka, T. Tubokawa, S. Uozumi, E. Calvo Alamillo, M. C. Fouz, J. Marin, J. Navarrete, J. Puerta Pelayo, A. Verdugo, M. Chadeeva, M. Danilov, A. Drutskoy, E. Popova, V. Rusinov, E. Tarkovsky, L. Emberger, M. Gabriel, C. Graf, Y. Israeli, N. Van Der Kolk, F. Simon, M. Szalay, H. Windel, S. Bilokin, J. Bonis, R. Pöschl, A. Irles, A. Thiebault, F. Richard, D. Zerwas, M. Anduze, V. Balagura, E. Becheva, V. Boudry, J. C. Brient, R. Cornat, E. Edy, M. Frotin, F. Gastaldi, B. Li, F. Magniette, J. Nanni, M. Rubio-Roy, K. Shpak, T. H. Tran, H. Videau, D. Yu, J. Cvach, M. Janata, M. Kovalcuk, Hadronic energy resolution of a combined high granularity scintillator calorimeter system, Journal of Instrumentation, 10.1088/1748-0221/13/12/P12022, 13, 12, 2018.12, This paper presents results obtained with the combined CALICE Scintillator Electromagnetic Calorimeter, Analogue Hadronic Calorimeter and Tail Catcher & Muon Tracker, three high granularity scintillator-silicon photomultiplier calorimeter prototypes. The response of the system to pions with momenta between 4 GeV/c and 32 GeV/c is analysed, including the average energy response, resolution, and longitudinal shower profiles. Two techniques are applied to reconstruct the initial particle energy from the measured energy depositions; a standard energy reconstruction which is linear in the measured depositions and a software compensation technique based on reweighting individually measured depositions according to their hit energy. The results are compared to predictions of the GEANT 4 physics lists QGSP-BERT-HP and FTFP-BERT-HP..
35. T. Tanaka, M. Abe, M. Aoki, M. Fukao, H. Iinuma, Y. Ikedo, K. Ishida, T. U. Ito, M. Iwasaki, R. Kadono, O. Kamigaito, S. Kanda, D. Kawall, N. Kawamura, A. Koda, K. M. Kojima, M. K. Kubo, Y. Matsuda, T. Mibe, Y. Miyake, K. Nagamine, S. Nishimura, T. Ogitsu, R. Okubo, N. Saito, K. Sasaki, Y. Sato, S. Seo, K. Shimomura, P. Strasser, M. Sugano, K. S. Tanaka, D. Tomono, H. A. Torii, E. Torikai, A. Toyoda, K. Ueno, Y. Ueno, D. Yagi, H. Yasuda, H. Yamaguchi, A. Yamamoto, T. Yamanaka, H. Yamazaki, M. Yoshida, T. Yoshioka, High precision measurement of muonium hyperfine structure, Journal of Physics: Conference Series, 10.1088/1742-6596/1138/1/012008, 1138, 1, 2018.12, MuSEUM (Muonium Spectroscopy Experiment Using Microwave) collaboration aims to measure the muonium hyperfine structure (MuHFS,vhfs) with a few ppb (parts per billion). MuHFS spectroscopy is a stringent test of the bound-state QED. From this measurement, the muon-proton magnetic moment ratio (μ /μ ) and the muon-electron mass ratio (m /m ) can also be determined by applying a high magnetic field. In the previous MuHFS measurement carried out at Los Alamos Meson Physics Facility (LAMPF), the main uncertainty was caused by the lack of the statistics. MuSEUM collaboration uses the high intense pulsed muon beam at Japan Proton Accelerator Research Complex (J-PARC) to improve the statistical uncertainty. We are also developing our own experimental setups for the improvement of the systematic uncertainties. From June 2016, MuSEUM collaboration have carried out the MuHFS measurement in an extremely low magnetic field within 100 nT and now we are preparing for the measurement in a 1.7 T high magnetic field. μ P μ e.
36. Noriko Oi, Hirohiko M. Shimizu, Katsuya Hirota, Masaaki Kitaguchi, Christopher C. Haddock, William M. Snow, Tamaki Yoshioka, Kenji Mishima, Takashi Ino, Tatsushi Shima, A Search for Possible Deviations from Newtonian Gravity at the nm Length Scale Using Neutron-Noble Gas Scattering, JPS Conference Proceedings, 2018.11.
37. Masaaki Kitaguchi, Koichiro Asahi, Shunsuke Endo, Christopher C. Haddock, Masahiro Hino, Katsuya Hirota, Takashi Ino, Ikuya Ito, Takahiro Iwata, Jun Koga, Yoshiyuki Miyachi, Takamasa Momose, Noriko Oi, Takuya Okudaira, Kenji Sakai, Tatsushi Shima, Hirohiko M. Shimizu, Shusuke Takada, Yutaka Yamagata, Tomoki Yamamoto, Tamaki Yoshioka, Fundamental Physics Using High-Performance Optics, JPS Conference Proceedings, 2018.11.
38. J. Koga, S. Takada, T. Yoshioka, H.M. Shimizu, K. Hirota, T. Okudaira, N. Oi, I. Ito, T. Yamamoto, S. Endo, C.C. Haddock, M. Kitaguchi, A. Kimura, K. Sakai, T. Ino, K. Asahi, T. Momose, T. Iwata, M. Hino, T. Shima, Y. Yamagata, Measurement of (n,gamma) Reaction of 117Sn for T-Violation Search by Using Compound Nucleus, JPS Conference Proceedings, 2018.11.
39. Y. Sato, H. Ikeda, M. Ikeno, T. Ito, K. Kawagoe, T. Kishishita, T. Kohriki, T. Kume, M. Matama, T. Mibe, T. Murakami, T. Nagasawa, S. Nishimura, N. Saito, O. Sasaki, S. Shirabe, M. Shoji, T. Suehara, M. Tanaka, J. Tojo, T. Uchida, K. Ueno, H. Yasuda, T. Yoshioka, Performance of Front-end ASIC and its evaluation with Silicon Strip Sensor for J-PARC Muon g-2/EDM Experiment, 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings, 10.1109/NSSMIC.2017.8532754, 2018.11, The muon anomalous magnetic moment (g -2)-{mu} and electric dipole moment (EDM) are sensitive to new physics beyond the Standard Model. We aim to measure ( g -2 ) -{mu} with a precision of 0.1 parts per million and search for EDM with a sensitivity of 10 e. cm at J-PARC. In this experiment, we use a silicon strip detector with high granularity and fast response to detect positrons from muon decay. The readout ASIC is required to tolerate a high hit rate of 1.4 MHz per strip, to be stable to the change of hit rate by a factor of 1 /150, and to have deep memory for the period of sim 40 mu mathrm{s} with 5 ns resolution. The prototype readout ASIC SliT128A has been fabricated using the Silterra 0.18- mu mathrm{m} CMOS process. We also connected the SliT128A with a silicon strip sensor and tested it with a muon beam at J-PARC. In this paper, we report the performance of the prototype ASIC itself and the prototype detector module. -21.
40. Christopher C. Haddock, Noriko Oi, Katsuya Hirota, Takashi Ino, Masaaki Kitaguchi, Satoru Matsumoto, Kenji Mishima, Tatsushi Shima, Hirohiko M. Shimizu, W. Michael Snow, Tamaki Yoshioka, Search for deviations from the inverse square law of gravity at nm range using a pulsed neutron beam, Physical Review D, 10.1103/PhysRevD.97.062002, 97, 6, 2018.03, We describe an experimental search for deviations from the inverse-square law of gravity at the nanometer length scale using neutron scattering from noble gases on a pulsed slow neutron beam line. By measuring the neutron momentum transfer (q) dependence of the differential cross section for xenon and helium and comparing to their well-known analytical forms, we place an upper bound on the strength of a new interaction as a function of interaction length λ which improves upon previous results in the region λ<0.1 nm, and remains competitive in the larger-λ region. A pseudoexperimental simulation is developed for this experiment and its role in the data analysis is described. We conclude with plans for improving sensitivity in the larger-λ region..
41. T. Okudaira, H. M. Shimizu, M. Kitaguchi, K. Hirota, C. C. Haddock, N. Oi, I. Ito, T. Yamamoto, S. Endo, S. Takada, J. Koga, T. Yoshioka, T. Ino, K. Asahi, T. Momose, T. Iwata, K. Sakai, T. Oku, A. Kimura, M. Hino, T. Shima, Y. Yamagata, Measurement of Angular Distributions in 139La(n,????) Reaction for T Violation Search, JPS Conference Proceedings, Proceedings of the International Conference on Neutron Optics (NOP2017), 22, 10.7566, 011041, 2018.01.
42. T.Okudaira, T.Yoshioka, Angular Distribution of $gamma$-rays from Neutron-Induced Compound States of $^{140}$La, Physical Review C, 2017.01.
43. 北原, 龍之介, 長倉, 直樹, 角野, 浩史, 吉岡, 瑞樹, 音野, 瑛俊, 富田, 龍彦, 角, 直幸, 森下, 彩, 古賀, 淳, 生出, 秀行, 嶋, 達志, 岩下, 芳久, 三島, 賢二, 猪野, 隆, 竹谷, 薫, 関, 義親, 関場, 大一郎, 清水, 裕彦, 広田, 克也, 横橋, 麻美, 北口, 雅暁, 山下, 了, 山田, 崇人, 家城, 斉, J-PARC/BL05における中性子寿命測定実験:高統計測定に向けたビームラインアップグレード, 日本物理学会講演概要集, 10.11316/jpsgaiyo.72.2.0_76, 72, 0, 76-76, 2017.01.
44. A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, J. Ives, A. O. Izmaylov, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, Yu G. Kudenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. MacDonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, R. Poutissou, G. Redlinger, T. Sato, T. Sekiguchi, A. T. Shaikhiev, T. Shinkawa, R. C. Strand, S. Sugimoto, Y. Tamagawa, R. Tschirhart, T. Tsunemi, D. V. Vavilov, B. Viren, Zhe Wang, Hanyu Wei, N. V. Yershov, Y. Yoshimura, T. Yoshioka, Search for the rare decay K+ →μ+ν ν ν SEARCH for the RARE DECAY ... A. V. ARTAMONOV et al., Physical Review D, 10.1103/PhysRevD.94.032012, 94, 3, 2016.08, Evidence of the K+→μ+ννν decay was searched for using E949 (Brookhaven National Laboratory, USA) experimental data with an exposure of 1.70×1012 stopped kaons. The data sample is dominated by the background process K+→μ+νμγ. An upper limit on the decay rate Γ(K+→μ+ννν)<2.4×10-6Γ(K+→all) at 90% confidence level was set assuming the standard model muon spectrum. The data are presented in such a way as to allow calculation of rates for any assumed μ+ spectrum..
45. G. Eigen, T. Price, N. K. Watson, J. S. Marshall, M. A. Thomson, D. R. Ward, D. Benchekroun, A. Hoummada, Y. Khoulaki, J. Apostolakis, A. Dotti, G. Folger, V. Ivantchenko, A. Ribon, V. Uzhinskiy, J. Y. Hostachy, L. Morin, E. Brianne, A. Ebrahimi, K. Gadow, P. Göttlicher, C. Günter, O. Hartbrich, B. Hermberg, A. Irles, F. Krivan, K. Krüger, J. Kvasnicka, S. Lu, B. Lutz, V. Morgunov, C. Neubüser, A. Provenza, M. Reinecke, F. Sefkow, S. Schuwalow, H. L. Tran, E. Garutti, S. Laurien, M. Matysek, M. Ramilli, S. Schröder, K. Briggl, P. Eckert, Y. Munwes, H. Ch Schultz-Coulon, W. Shen, R. Stamen, B. Bilki, E. Norbeck, D. Northacker, Y. Onel, B. Van Doren, G. W. Wilson, K. Kawagoe, H. Hirai, Y. Sudo, T. Suehara, H. Sumida, S. Takada, T. Tomita, T. Yoshioka, M. Wing, A. Bonnevaux, C. Combaret, L. Caponetto, G. Grenier, R. Han, J. C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Steen, J. Berenguer Antequera, E. Calvo Alamillo, M. C. Fouz, J. Marin, J. Puerta-Pelayo, A. Verdugo, B. Bobchenko, O. Markin, E. Novikov, V. Rusinov, E. Tarkovsky, N. Kirikova, V. Kozlov, P. Smirnov, Y. Soloviev, D. Besson, P. Buzhan, M. Chadeeva, M. Danilov, A. Drutskoy, A. Ilyin, D. Mironov, R. Mizuk, E. Popova, M. Gabriel, Hadron shower decomposition in the highly granular CALICE analogue hadron calorimeter, Journal of Instrumentation, 10.1088/1748-0221/11/06/P06013, 11, 6, 2016.06, The spatial development of hadronic showers in the CALICE scintillator-steel analogue hadron calorimeter is studied using test beam data collected at CERN and FNAL for single positive pions and protons with initial momenta in the range of 10-80 GeV/c. Both longitudinal and radial development of hadron showers are parametrised with two-component functions. The parametrisation is fit to test beam data and simulations using the QGSP-BERT and FTFP-BERT physics lists from GEANT4 version 9.6. The parameters extracted from data and simulated samples are compared for the two types of hadrons. The response to pions and the ratio of the non-electromagnetic to the electromagnetic calorimeter response, h/e, are estimated using the extrapolation and decomposition of the longitudinal profiles..
46. Z. Deng, Y. Li, Y. Wang, Q. Yue, Z. Yang, D. Boumediene, C. Carloganu, V. Français, G. Cho, D. W. Kim, S. C. Lee, W. Park, S. Vallecorsa, J. Apostolakis, G. Folger, C. Grefe, V. Ivantchenko, A. Ribon, V. Uzhinskiy, S. Cauwenbergh, M. Tytgat, A. Pingault, N. Zaganidis, E. Brianne, A. Ebrahimi, K. Gadow, P. Göttlicher, C. Günter, O. Hartbrich, B. Hermberg, A. Irles, F. Krivan, K. Krüger, J. Kvasnicka, S. Lu, B. Lutz, V. Morgunov, C. Neubüser, A. Provenza, M. Reinecke, F. Sefkow, S. Schuwalow, H. L. Tran, E. Garutti, S. Laurien, M. Matysek, M. Ramilli, S. Schroeder, B. Bilki, E. Norbeck, D. Northacker, Y. Onel, S. Chang, A. Khan, D. H. Kim, D. J. Kong, Y. D. Oh, K. Kawagoe, H. Hirai, Y. Sudo, T. Suehara, H. Sumida, T. Yoshioka, E. Cortina Gil, S. Mannai, V. Buridon, C. Combaret, L. Caponetto, R. Eté, G. Garillot, G. Grenier, R. Han, J. C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, J. Berenguer Antequera, E. Calvo Alamillo, M. C. Fouz, J. Marin, J. Puerta-Pelayo, A. Verdugo, M. Chadeeva, M. Danilov, F. Corriveau, M. Gabriel, P. Goecke, C. Kiesling, N. Van Der Kolk, F. Simon, M. Szalay, S. Bilokin, J. Bonis, P. Cornebise, F. Richard, R. Pöschl, Resistive Plate Chamber digitization in a hadronic shower environment, Journal of Instrumentation, 10.1088/1748-0221/11/06/P06014, 11, 6, 2016.06, The CALICE Semi-Digital Hadronic Calorimeter technological prototype is a sampling calorimeter using Glass Resistive Plate Chamber detectors with a three-threshold readout as the active medium. This technology is one of the two options proposed for the hadronic calorimeter of the International Large Detector for the International Linear Collider. The prototype was exposed to beams of muons, electrons and pions of different energies at the CERN Super Proton Synchrotron. To be able to study the performance of such a calorimeter in future experiments it is important to ensure reliable simulation of its response. This paper presents the SDHCAL prototype simulation performed with GEANT4 and the digitization procedure achieved with an algorithm called SimDigital. A detailed description of this algorithm is given and the methods to determinate its parameters using muon tracks and electromagnetic showers are explained. The comparison with hadronic shower data shows a good agreement up to 50 GeV. Discrepancies are observed at higher energies. The reasons for these differences are investigated..
47. B. Freund, C. Neubüser, J. Repond, J. Schlereth, L. Xia, A. Dotti, C. Grefe, V. Ivantchenko, J. Berenguer Antequera, E. Calvo Alamillo, M. C. Fouz, J. Marin, J. Puerta-Pelayo, A. Verdugo, E. Brianne, A. Ebrahimi, K. Gadow, P. Göttlicher, C. Günter, O. Hartbrich, B. Hermberg, A. Irles, F. Krivan, K. Krüger, J. Kvasnicka, S. Lu, B. Lutz, V. Morgunov, A. Provenza, M. Reinecke, F. Sefkow, S. Schuwalow, H. L. Tran, E. Garutti, S. Laurien, M. Matysek, M. Ramilli, S. Schroeder, B. Bilki, E. Norbeck, D. Northacker, Y. Onel, J. Cvach, P. Gallus, M. Havranek, M. Janata, M. Kovalcuk, J. Kvasnicka, D. Lednicky, M. Marcisovsky, I. Polak, J. Popule, L. Tomasek, M. Tomasek, P. Sicho, J. Smolik, V. Vrba, J. Zalesak, B. Van Doren, G. W. Wilson, K. Kawagoe, H. Hirai, Y. Sudo, T. Suehara, H. Sumida, S. Takada, T. Tomita, T. Yoshioka, S. Bilokin, J. Bonis, P. Cornebise, R. Pöschl, F. Richard, A. Thiebault, D. Zerwas, J. Y. Hostachy, L. Morin, D. Besson, M. Chadeeva, M. Danilov, O. Markin, E. Popova, M. Gabriel, P. Goecke, C. Kiesling, N. Van Der Kolk, F. Simon, M. Szalay, F. Corriveau, G. C. Blazey, A. Dyshkant, K. Francis, V. Zutshi, K. Kotera, H. Ono, T. Takeshita, S. Ieki, Y. Kamiya, W. Ootani, N. Shibata, DHCAL with minimal absorber: Measurements with positrons, Journal of Instrumentation, 10.1088/1748-0221/11/05/P05008, 11, 5, 2016.05, In special tests, the active layers of the CALICE Digital Hadron Calorimeter prototype, the DHCAL, were exposed to low energy particle beams, without being interleaved by absorber plates. The thickness of each layer corresponded approximately to 0.29 radiation lengths or 0.034 nuclear interaction lengths, defined mostly by the copper and steel skins of the detector cassettes. This paper reports on measurements performed with this device in the Fermilab test beam with positrons in the energy range of 1 to 10 GeV. The measurements are compared to simulations based on GEANT4 and a standalone program to emulate the detailed response of the active elements..
48. H. M. Shimizu, W. M. Snow, V. P. Gudkov, J. D. Bowman, J. Curole, B. M. Goodson, H. Harada, P. Hautle, M. Hino, K. Hirota, G. Ichikawa, T. Ino, S. Ishimoto, T. Iwata, A. Kimura, M. Kitaguchi, Y. Kiyanagi, J. Koga, K. Mishima, Y. Miyachi, T. Momose, T. Morishima, K. Nagamoto, A. Okada, T. Okudaira, S. Penttila, B. Plaster, K. Sakai, D. Schaper, S. Takada, K. Taketani, X. Tong, A. S. Tremsin, Y. Yamagata, T. Yamamoto, N. Yamanaka, M. Yokohashi, T. Yoshioka, Discrete symmetry tests in neutron-induced compound states, Proceedings of Science, 10.22323/1.281.0187, 2016-September, 2016.01, A possibility of new type experimental searches for new physics beyond the standard model is being introduced in the symmetry tests in neutron-induced compound states according to the successful operation of intense pulsed neutron sources. The basis of experiment design is discussed..
49. Hiroaki Yamashiro, Kiyotomo Kawagoe, Taikan Suehara, Tamaki Yoshioka, Yuji Sudo, Hiroki Sumida, Performance evaluation of PSD for silicon ECAL, 2016 International Workshop on Future Linear Colliders, LCWS 2016 Proceedings of the International Workshop on Future Linear Colliders, LCWS 2016, 2016.01.
50. I. Sekiya, H. Hirai, Taikan Suehara, Tamaki Yoshioka, Kiyotomo Kawagoe, Performance study of SKIROC2 and SKIROC2A with BGA testboard, 2016.01.
51. Naoki Nagakura, Katsuya Hirota, Sei Ieki, Takashi Ino, Yoshihisa Iwashita, Masaaki Kitaguchi, Ryunosuke Kitahara, Kenji Mishima, Aya Morishita, Hideyuki Oide, Hidetoshi Otono, Risa Sakakibara, Yoshichika Seki, Tatsushi Shima, Hirohiko M. Shimizu, Tomoaki Sugino, Naoyuki Sumi, Hirochika Sumino, Kaoru Taketani, Genki Tanaka, Tatsuhiko Tomita, Takahito Yamada, Satoru Yamashita, Mami Yokohashi, Tamaki Yoshioka, Precise neutron lifetime experiment using pulsed neutron beams at J-PARC, Proceedings of Science, 2016-September, 2016.01.
52. A.V.Artamanov, T.Yoshioka, Search for the decay K+-->μ+ννν, Physical Review D, 2016.01.
53. A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, J. Ives, A. O. Izmaylov, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, Yu G. Kudenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. MacDonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, R. Poutissou, G. Redlinger, T. Sato, T. Sekiguchi, A. T. Shaikhiev, T. Shinkawa, R. C. Strand, Tamaki Yoshioka, Search for the rare decay K+ →μ+ν ν ν SEARCH for the RARE DECAY ... A. V. ARTAMONOV et al., Physical Review D, 10.1103/PhysRevD.94.032012, 94, 3, 2016.01.
54. M. Chefdeville, Y. Karyotakis, J. Repond, J. Schlereth, L. Xia, G. Eigen, J. S. Marshall, M. A. Thomson, D. R. Ward, N. Alipour Tehrani, J. Apostolakis, D. Dannheim, K. Elsener, G. Folger, C. Grefe, V. Ivantchenko, M. Killenberg, W. Klempt, E. Van Der Kraaij, L. Linssen, A. I. Lucaci-Timoce, A. Münnich, S. Poss, A. Ribon, P. Roloff, A. Sailer, D. Schlatter, E. Sicking, J. Strube, V. Uzhinskiy, S. Chang, A. Khan, D. H. Kim, D. J. Kong, Y. D. Oh, G. C. Blazey, A. Dyshkant, K. Francis, V. Zutshi, J. Giraud, D. Grondin, J. Y. Hostachy, E. Brianne, U. Cornett, D. David, G. Falley, K. Gadow, P. Göttlicher, C. Günter, O. Hartbrich, B. Hermberg, A. Irles, S. Karstensen, F. Krivan, K. Krüger, J. Kvasnicka, S. Lu, B. Lutz, S. Morozov, V. Morgunov, C. Neubüser, A. Provenza, M. Reinecke, F. Sefkow, P. Smirnov, M. Terwort, H. L. Tran, A. Vargas-Trevino, E. Garutti, S. Laurien, M. Matysek, M. Ramilli, S. Schröder, K. Briggl, P. Eckert, T. Harion, Y. Munwes, H. Ch Schultz-Coulon, W. Shen, R. Stamen, B. Bilki, Y. Onel, K. Kawagoe, H. Hirai, Y. Sudo, T. Suehara, H. Sumida, S. Takada, T. Tomita, T. Yoshioka, M. Wing, E. Calvo Alamillo, M. C. Fouz, J. Marin, J. Puerta-Pelayo, A. Verdugo, B. Bobchenko, M. Chadeeva, M. Danilov, O. Markin, Shower development of particles with momenta from 15 GeV to 150 GeV in the CALICE scintillator-tungsten hadronic calorimeter, Journal of Instrumentation, 10.1088/1748-0221/10/12/P12006, 10, 12, 2015.12, We present a study of showers initiated by electrons, pions, kaons, and protons with momenta from 15 GeV to 150 GeV in the highly granular CALICE scintillator-tungsten analogue hadronic calorimeter. The data were recorded at the CERN Super Proton Synchrotron in 2011. The analysis includes measurements of the calorimeter response to each particle type as well as measurements of the energy resolution and studies of the longitudinal and radial shower development for selected particles. The results are compared to Geant4 simulations (version 9.6.p02). In the study of the energy resolution we include previously published data with beam momenta from 1 GeV to 10 GeV recorded at the CERN Proton Synchrotron in 2010..
55. Y. Arimoto, N. Higashi, Y. Igarashi, Y. Iwashita, T. Ino, R. Katayama, M. Kitaguchi, R. Kitahara, H. Matsumura, K. Mishima, N. Nagakura, H. Oide, H. Otono, R. Sakakibara, T. Shima, H. M. Shimizu, T. Sugino, N. Sumi, H. Sumino, K. Taketani, G. Tanaka, M. Tanaka, K. Tauchi, A. Toyoda, T. Tomita, T. Yamada, S. Yamashita, H. Yokoyama, T. Yoshioka, Development of time projection chamber for precise neutron lifetime measurement using pulsed cold neutron beams, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2015.08.006, 799, 187-196, 2015.08, A new time projection chamber (TPC) was developed for neutron lifetime measurement using a pulsed cold neutron spallation source at the Japan Proton Accelerator Research Complex (J-PARC). Managing considerable background events from natural sources and the beam radioactivity is a challenging aspect of this measurement. To overcome this problem, the developed TPC has unprecedented features such as the use of polyether-ether-ketone plates in the support structure and internal surfaces covered with 6Li-enriched tiles to absorb outlier neutrons. In this paper, the design and performance of the new TPC are reported in detail..
56. B. Bilki, J. Repond, J. Schlereth, L. Xia, Z. Deng, Y. Li, Y. Wang, Q. Yue, Z. Yang, G. Eigen, Y. Mikami, T. Price, N. K. Watson, M. A. Thomson, D. R. Ward, D. Benchekroun, A. Hoummada, Y. Khoulaki, C. Cârloganu, S. Chang, A. Khan, D. H. Kim, D. J. Kong, Y. D. Oh, G. C. Blazey, A. Dyshkant, K. Francis, J. G.R. Lima, P. Salcido, V. Zutshi, V. Boisvert, B. Green, A. Misiejuk, F. Salvatore, K. Kawagoe, Y. Miyazaki, Y. Sudo, T. Suehara, T. Tomita, H. Ueno, T. Yoshioka, J. Apostolakis, G. Folger, V. Ivantchenko, A. Ribon, V. Uzhinskiy, S. Cauwenbergh, M. Tytgat, N. Zaganidis, J. Y. Hostachy, L. Morin, K. Gadow, P. Göttlicher, C. Günter, K. Krüger, B. Lutz, M. Reinecke, F. Sefkow, N. Feege, E. Garutti, S. Laurien, S. Lu, I. Marchesini, M. Matysek, M. Ramilli, A. Kaplan, E. Norbeck, D. Northacker, Y. Onel, E. J. Kim, B. Van Doren, G. W. Wilson, M. Wing, B. Bobchenko, M. Chadeeva, R. Chistov, M. Danilov, A. Drutskoy, A. Epifantsev, O. Markin, R. Mizuk, E. Novikov, V. Popov, V. Rusinov, E. Tarkovsky, D. Besson, E. Popova, M. Gabriel, C. Kiesling, F. Simon, C. Soldner, M. Szalay, M. Tesar, L. Weuste, M. S. Amjad, J. Bonis, S. Callier, S. Conforti Di Lorenzo, P. Cornebise, Ph Doublet, Testing hadronic interaction models using a highly granular silicon-tungsten calorimeter, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2015.05.009, 794, 240-254, 2015.07, Abstract A detailed study of hadronic interactions is presented using data recorded with the highly granular CALICE silicon-tungsten electromagnetic calorimeter. Approximately 350,000 selected events at energies between 2 and 10 GeV have been studied. The predictions of several physics models available within the GEANT4 simulation tool kit are compared to this data. A reasonable overall description of the data is observed; the Monte Carlo predictions are within 20% of the data, and for many observables much closer. The largest quantitative discrepancies are found in the longitudinal and transverse distributions of reconstructed energy. π-.
57. M. S. Amjad, M. Anduze, J. -E. Augustin, J. Bonis, V. Boudry, C. Bourgeois, J. -C. Brient, S. Callier, M. Cerutti, S. Chen, R. Cornat, P. Cornebise, D. Cuisy, J. David, C. de la Taille, F. Dulucq, T. Frisson, M. Frotin, F. Gastaldi, P. Ghislain, J. Giraud, A. Gonnin, D. Grondin, E. Guliyev, J. -Y. Hostachy, D. Jeans, Y. Kamiya, K. Kawagoe, C. Kozakai, D. Lacour, L. Lavergne, S. H. Lee, F. Magniette, H. Ono, R. Poeschl, J. Rouene, N. Seguin-Moreau, H. S. Song, Y. Sudo, A. Thiebault, H. Tran, H. Ueno, N. van der Kolk, T. Yoshioka, Beam test performance of the SKIROC2 ASIC, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 10.1016/j.nima.2014.12.011, 778, 78-84, 2015.04, Beam tests of the first layers of CALICE silicon tungsten ECAL technological prototype were performed in April and July 2012 using 1-6 GeV electron beam at DESY. This paper presents an analysis of the SKIROC2 readout ASIC performance under test beam conditions. (C) 2014 Elsevier B.V. All rights reserved..
58. M. S. Amjad, M. Anduze, J. E. Augustin, J. Bonis, V. Boudry, C. Bourgeois, J. C. Brient, S. Callier, M. Cerutti, S. Chen, R. Cornat, P. Cornebise, D. Cuisy, J. David, C. De La Taille, F. Dulucq, T. Frisson, M. Frotin, F. Gastaldi, P. Ghislain, J. Giraud, A. Gonnin, D. Grondin, E. Guliyev, J. Y. Hostachy, D. Jeans, Y. Kamiya, K. Kawagoe, C. Kozakai, D. Lacour, L. Lavergne, S. H. Lee, F. Magniette, H. Ono, R. Poeschl, J. Rouëné, N. Seguin-Moreau, H. S. Song, Y. Sudo, A. Thiebault, H. Tran, H. Ueno, N. Van Der Kolk, T. Yoshioka, Beam test performance of the SKIROC2 ASIC, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2014.12.011, 778, 78-84, 2015.04, Beam tests of the first layers of CALICE silicon tungsten ECAL technological prototype were performed in April and July 2012 using 1-6 GeV electron beam at DESY. This paper presents an analysis of the SKIROC2 readout ASIC performance under test beam conditions..
59. Y. Miyazaki, S. Shimizu, S. Bianchin, C. Djalali, D. Gill, J. Jiang, M. Hasinoff, K. Horie, Y. Igarashi, J. Imazato, A. Ivashkin, M. Kohl, R. Narikawa, R. Pywell, S. Strauch, M. Tabata, A. Toyoda, H. Yamazaki, T. Yoshioka, Performance test of a lead-glass counter for the J-PARC E36 experiment, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 10.1016/j.nima.2015.01.044, 779, 13-17, 2015.04, The J-PARC E36 experiment will search for a violation of lepton universality by a precise measurement of the ratio of the kaon decay widths R-K = Gamma(K+ -> e(+)nu)/Gamma(K+ -> mu(+)nu). Charged particles will be identified by the combination of three independent systems' a lead glass Cherenkov counter, an aerogel Cherenkov counter, and a time measurement. The performance of the load glass Cherenkov counter was investigated with e(+), mu(+), and pi(+) beams in the relevant momentum region from the K+ decays. By using a polyethylene degrader to slow down the beam momentum in front of the lead-glass block, we succeeded in reducing the muon mis-identification probability down to 5% while maintaining a high e(+) detection efficiency of 98%. (C) 2015 Elsevier By. All rights reserved..
60. B. Bilki, J. Repond, L. Xia, G. Eigen, M. A. Thomson, D. R. Ward, D. Benchekroun, A. Hoummada, Y. Khoulaki, S. Chang, A. Khan, D. H. Kim, D. J. Kong, Y. D. Oh, G. C. Blazey, A. Dyshkant, K. Francis, J. G.R. Lima, R. Salcido, V. Zutshi, F. Salvatore, K. Kawagoe, Y. Miyazaki, Y. Sudo, T. Suehara, T. Tomita, H. Ueno, T. Yoshioka, J. Apostolakis, D. Dannheim, G. Folger, V. Ivantchenko, W. Klempt, A. I. Lucaci-Timoce, A. Ribon, D. Schlatter, E. Sicking, V. Uzhinskiy, J. Giraud, D. Grondin, J. Y. Hostachy, L. Morin, E. Brianne, U. Cornett, D. David, A. Ebrahimi, G. Falley, K. Gadow, P. Göttlicher, C. Günter, O. Hartbrich, B. Hermberg, S. Karstensen, F. Krivan, K. Krüger, S. Lu, B. Lutz, S. Morozov, V. Morgunov, C. Neubüser, M. Reinecke, F. Sefkow, P. Smirnov, H. L. Tran, P. Buhmann, E. Garutti, S. Laurien, M. Matysek, M. Ramilli, K. Briggl, P. Eckert, T. Harion, Y. Munwes, H. Ch Schultz-Coulon, W. Shen, R. Stamen, E. Norbeck, D. Northacker, Y. Onel, B. van Doren, G. W. Wilson, M. Wing, C. Combaret, L. Caponetto, R. Eté, G. Grenier, R. Han, J. C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, J. Berenguer Antequera, E. Calvo Alamillo, M. C. Fouz, J. Marin, J. Puerta-Pelayo, Pion and proton showers in the CALICE scintillator-steel analogue hadron calorimeter, Journal of Instrumentation, 10.1088/1748-0221/10/04/P04014, 10, 4, 2015.04, Showers produced by positive hadrons in the highly granular CALICE scintillator-steel analogue hadron calorimeter were studied. The experimental data were collected at CERN and FNAL for single particles with initial momenta from 10 to 80 GeV/c. The calorimeter response and resolution and spatial characteristics of shower development for proton- and pion-induced showers for test beam data and simulations using GEANT4 version 9.6 are compared..
61. A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, J. Ives, A. O. Izmaylov, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, Yu G. Kudenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. Macdonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, R. Poutissou, G. Redlinger, T. Sato, T. Sekiguchi, A. T. Shaikhiev, T. Shinkawa, R. C. Strand, Tamaki Yoshioka, Search for heavy neutrinos in K+ →μ+νH decays, Physical Review D - Particles, Fields, Gravitation and Cosmology, 10.1103/PhysRevD.91.052001, 91, 5, 2015.03.
62. Hiroki Sumida, Masato Matama, Yuji Sudo, Taikan Suehara, Tamaki Yoshioka, Kiyotomo Kawagoe, Daniel Jeans, Tohru Takeshita, Katsushige Kotera, Optimization of layer composition for ILD ECAL, 2015 International Workshop on Future Linear Colliders, LCWS 2015 Proceedings of the International Workshop on Future Linear Colliders, LCWS 2015, 2015.01.
63. K. Francis, J. Repond, J. Schlereth, J. Smith, L. Xia, E. Baldolemar, S. T. Park, M. Sosebee, A. P. White, J. Yu, G. Eigen, Y. Mikami, N. K. Watson, M. A. Thomson, D. R. Ward, D. Benchekroun, A. Hoummada, Y. Khoulaki, J. Apostolakis, A. Dotti, G. Folger, V. Ivantchenko, A. Ribon, V. Uzhinskiy, C. Cârloganu, P. Gay, S. Manen, L. Royer, M. Tytgat, N. Zaganidis, G. C. Blazey, A. Dyshkant, J. G.R. Lima, V. Zutshi, J. Y. Hostachy, L. Morin, U. Cornett, D. David, A. Ebrahimi, G. Falley, K. Gadow, P. Göttlicher, C. Günter, O. Hartbrich, B. Hermberg, S. Karstensen, F. Krivan, K. Krüger, B. Lutz, S. Morozov, V. Morgunov, C. Neubüser, M. Reinecke, F. Sefkow, P. Smirnov, M. Terwort, E. Garutti, S. Laurien, S. Lu, I. Marchesini, M. Matysek, M. Ramilli, K. Briggl, P. Eckert, T. Harion, H. Ch Schultz-Coulon, W. Shen, R. Stamen, B. Bilki, E. Norbeck, D. Northacker, Y. Onel, G. W. Wilson, K. Kawagoe, Y. Sudo, T. Yoshioka, P. D. Dauncey, M. Wing, F. Salvatore, E. Cortina Gil, S. Mannai, G. Baulieu, P. Calabria, L. Caponetto, C. Combaret, R. Della Negra, G. Grenier, R. Han, J. C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, W. Tromeur, M. Vander Donckt, Y. Zoccarato, E. Calvo Alamillo, Performance of the first prototype of the CALICE scintillator strip electromagnetic calorimeter, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2014.06.039, 763, 278-289, 2014.11, A first prototype of a scintillator strip-based electromagnetic calorimeter was built, consisting of 26 layers of tungsten absorber plates interleaved with planes of 45×10×3 mm plastic scintillator strips. Data were collected using a positron test beam at DESY with momenta between 1 and 6 GeV/c. The prototype's performance is presented in terms of the linearity and resolution of the energy measurement. These results represent an important milestone in the development of highly granular calorimeters using scintillator strip technology. A number of possible design improvements were identified, which should be implemented in a future detector of this type. This technology is being developed for a future linear collider experiment, aiming at the precise measurement of jet energies using particle flow techniques. © 2014 Elsevier B.V. 3.
64. C. Adloff, J. -J. Blaising, M. Chefdeville, C. Drancourt, R. Gaglione, N. Geffroy, Y. Karyotakis, I. Koletsou, J. Prast, G. Vouters, J. Repond, J. Schlereth, L. Xia, E. Baldolemar, J. Li, S. T. Park, M. Sosebee, A. P. White, J. Yu, G. Eigen, M. A. Thomson, D. R. Ward, D. Benchekroun, A. Hoummada, Y. Khoulaki, J. Apostolakis, S. Arfaoui, M. Benoit, D. Dannheim, K. Elsener, G. Folger, C. Grefe, V. Ivantchenko, M. Killenberg, W. Klempt, E. van der Kraaij, L. Linssen, A. -I. Lucaci-Timoce, A. Muennich, S. Poss, A. Ribon, P. Roloff, A. Sailer, D. Schlatter, E. Sicking, J. Strube, V. Uzhinskiy, C. Carloganu, P. Gay, S. Manen, L. Royer, U. Cornett, D. David, A. Ebrahimi, G. Falley, N. Feege, K. Gadow, P. Goettlicher, C. Guenter, O. Hartbrich, B. Hermberg, S. Karstensen, F. Krivan, K. Krueger, S. Lu, B. Lutz, S. Morozov, V. Morgunov, C. Neubueser, M. Reinecke, F. Sefkow, P. Smirnov, M. Terwort, A. Fagot, M. Tytgat, N. Zaganidis, J. -Y. Hostachy, L. Morin, E. Garutti, S. Laurien, I. Marchesini, M. Matysek, M. Ramilli, K. Briggl, P. Eckert, T. Harion, H. -Ch. Schultz-Coulon, W. Shen, R. Stamen, S. Chang, A. Khan, D. H. Kim, D. J. Kong, Y. D. Oh, B. Bilki, E. Norbeck, D. Northacker, Y. Onel, G. W. Wilson, K. Kawagoe, Y. Miyazaki, Y. Sudo, H. Ueno, T. Yoshioka, P. D. Dauncey, E. Cortina Gil, S. Mannai, G. Baulieu, P. Calabria, L. Caponetto, C. Combaret, R. Della Negra, R. Ete, G. Grenier, R. Han, J-C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, W. Tromeur, M. Vander Donckt, Y. Zoccarato, J. Berenguer Antequera, E. Calvo Alamillo, M. -C. Fouz, J. Puerta-Pelayo, F. Corriveau, B. Bobchenko, M. Chadeeva, M. Danilov, A. Epifantsev, O. Markin, R. Mizuk, E. Novikov, V. Rusinov, E. Tarkovsky, V. Kozlov, Y. Soloviev, D. Besson, P. Buzhan, A. Ilyin, V. Kantserov, V. Kaplin, E. Popova, V. Tikhomirov, M. Gabriel, C. Kiesling, K. Seidel, F. Simon, C. Soldner, M. Szalay, M. Tesar, L. Weuste, M. S. Amjad, J. Bonis, S. Conforti di Lorenzo, P. Cornebise, J. Fleury, T. Frisson, N. van der Kolk, F. Richard, R. Poeschl, J. Rouene, M. Anduze, V. Balagura, E. Becheva, V. Boudry, J-C. Brient, R. Cornat, M. Frotin, F. Gastaldi, E. Guliyev, Y. Haddad, F. Magniette, M. Ruan, T. H. Tran, H. Videau, S. Callier, F. Dulucq, G. Martin-Chassard, Ch. de la Taille, L. Raux, N. Seguin-Moreau, J. Zacek, J. Cvach, P. Gallus, M. Havranek, M. Janata, J. Kvasnicka, D. Lednicky, M. Marcisovsky, I. Polak, J. Popule, L. Tomasek, M. Tomasek, P. Ruzicka, P. Sicho, J. Smolik, V. Vrba, J. Zalesak, B. Belhorma, H. Ghazlane, K. Kotera, H. Ono, T. Takeshita, S. Uozumi, J. S. Chai, H. S. Song, S. H. Lee, M. Goetze, J. Sauer, S. Weber, C. Zeitnitz, The time structure of hadronic showers in highly granular calorimeters with tungsten and steel absorbers, JOURNAL OF INSTRUMENTATION, 10.1088/1748-0221/9/07/P07022, 9, 7, 2014.07, The intrinsic time structure of hadronic showers influences the timing capability and the required integration time of hadronic calorimeters in particle physics experiments, and depends on the active medium and on the absorber of the calorimeter. With the CALICE T3B experiment, a setup of 15 small plastic scintillator tiles read out with Silicon Photomultipliers, the time structure of showers is measured on a statistical basis with high spatial and temporal resolution in sampling calorimeters with tungsten and steel absorbers. The results are compared to GEANT4 (version 9.4 patch 03) simulations with different hadronic physics models. These comparisons demonstrate the importance of using high precision treatment of low-energy neutrons for tungsten absorbers, while an overall good agreement between data and simulations for all considered models is observed for steel..
65. C. Adloff, J. -J. Blaising, M. Chefdeville, C. Drancourt, R. Gaglione, N. Geffroy, Y. Karyotakis, I. Koletsou, J. Prast, G. Vouters, J. Repond, J. Schlereth, J. Smith, L. Xia, E. Baldolemar, J. Li, S. T. Park, M. Sosebee, A. P. White, J. Yu, G. Eigen, M. A. Thomson, D. R. Ward, D. Benchekroun, A. Hoummada, Y. Khoulaki, J. Apostolakis, D. Dannheim, A. Dotti, K. Elsener, G. Folger, C. Grefe, V. Ivantchenko, M. Killenberg, W. Klempt, E. van der Kraaij, C. B. Lam, L. Linssen, A. -I. Lucaci-Timoce, A. Muennich, S. Poss, A. Ribon, A. Sailer, D. Schlatter, J. Strube, V. Uzhinskiy, C. Carloganu, P. Gay, S. Manen, L. Royer, M. Tytgat, N. Zaganidis, G. C. Blazey, A. Dyshkant, J. G. R. Lima, V. Zutshi, J. -Y. Hostachy, L. Morin, U. Cornett, D. David, A. Ebrahimi, G. Falley, N. Feege, K. Gadow, P. Goettlicher, C. Guenter, O. Hartbrich, B. Hermberg, S. Karstensen, F. Krivan, K. Krueger, S. Lu, B. Lutz, S. Morozov, V. Morgunov, C. Neubueser, M. Reinecke, F. Sefkow, P. Smirnov, M. Terwort, E. Garutti, S. Laurien, I. Marchesini, M. Matysek, M. Ramilli, K. Briggl, P. Eckert, T. Harion, H. -Ch. Schultz-Coulon, W. Shen, R. Stamen, B. Bilki, E. Norbeck, D. Northacker, Y. Onel, G. W. Wilson, K. Kawagoe, Y. Sudo, T. Yoshioka, P. D. Dauncey, M. Wing, F. Salvatore, E. Cortina Gil, S. Mannai, G. Baulieu, P. Calabria, L. Caponetto, C. Combaret, R. Della Negra, G. Grenier, R. Han, J-C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, W. Tromeur, M. Vander Donckt, Y. Zoccarato, E. Calvo Alamillo, M. -C. Fouz, J. Puerta-Pelayo, F. Corriveau, B. Bobchenko, M. Chadeeva, M. Danilov, A. Epifantsev, O. Markin, R. Mizuk, E. Novikov, V. Popov, V. Rusinov, E. Tarkovsky, N. Kirikova, V. Kozlov, P. Smirnov, Y. Soloviev, D. Besson, P. Buzhan, A. Ilyin, V. Kantserov, V. Kaplin, A. Karakash, E. Popova, V. Tikhomirov, C. Kiesling, K. Seidel, F. Simon, C. Soldner, M. Szalay, M. Tesar, L. Weuste, M. S. Amjad, J. Bonis, S. Callier, S. Conforti di Lorenzo, P. Cornebise, Ph. Doublet, F. Dulucq, J. Fleury, T. Frisson, N. van der Kolk, H. Li, G. Martin-Chassard, F. Richard, Ch. de la Taille, R. Poeschl, L. Raux, J. Rouene, N. Seguin-Moreau, M. Anduze, V. Balagura, V. Boudry, J-C. Brient, R. Cornat, M. Frotin, F. Gastaldi, E. Guliyev, Y. Haddad, F. Magniette, G. Musat, M. Ruan, T. H. Tran, H. Videau, B. Bulanek, J. Zacek, J. Cvach, P. Gallus, M. Havranek, M. Janata, J. Kvasnicka, D. Lednicky, M. Marcisovsky, I. Polak, J. Popule, L. Tomasek, M. Tomasek, P. Ruzicka, P. Sicho, J. Smolik, V. Vrba, J. Zalesak, B. Belhorma, H. Ghazlane, K. Kotera, T. Takeshita, S. Uozumi, S. Chang, A. Khan, D. H. Kim, D. J. Kong, Y. D. Oh, M. Goetze, J. Sauer, S. Weber, C. Zeitnitz, Shower development of particles with momenta from 1 to 10 GeV in the CALICE Scintillator-Tungsten HCAL, JOURNAL OF INSTRUMENTATION, 10.1088/1748-0221/9/01/P01004, 9, 1, 2014.01, Lepton colliders are considered as options to complement and to extend the physics programme at the Large Hadron Collider. The Compact Linear Collider (CLIC) is an e(+)e(-) collider under development aiming at centre-of-mass energies of up to 3 TeV. For experiments at CLIC, a hadron sampling calorimeter with tungsten absorber is proposed. Such a calorimeter provides sufficient depth to contain high-energy showers, while allowing a compact size for the surrounding solenoid.
A fine-grained calorimeter prototype with tungsten absorber plates and scintillator tiles read out by silicon photomultipliers was built and exposed to particle beams at CERN. Results obtained with electrons, pions and protons of momenta up to 10 GeV are presented in terms of energy resolution and shower shape studies. The results are compared with several GEANT4 simulation models in order to assess the reliability of the Monte Carlo predictions relevant for a future experiment at CLIC..
66. Tatsuhiko Tomita, Hiroto Hirai, Kiyotomo Kawagoe, Yohei Miyazaki, Yuji Sudo, Taikan Suehara, Hiroki Sumida, Shusuke Takada, Hiraku Ueno, Tamaki Yoshioka, A silicon sensor study for the ILD ECAL, Proceedings of Science, 2014.01.
67. Shusuke Takada, Hiroto Hirai, Kiyotomo Kawagoe, Yohei Miyazaki, Yuji Sudo, Taikan Suehara, Hiroki Sumida, Tatsuhiko Tomita, Hiraku Ueno, Tamaki Yoshioka, Characteristic study of silicon sensor for ILD ECAL, 2014.01.
68. Sakurai, Dai, Chiba, Junsei, Ino, Takashi, Kakusho, Nobunori, Kaneko, Naokatsu, Katayama, Ryo, Kitaguchi, Masaaki, Mishima, Kenji, Muto, Suguru, Ozeki, Kazuhide, Seki, Yoshichika, Shimizu, Hirohiko M., Yamashita, Satoru, Yoshioka, Tamaki, Nishimura, Daiki, Development of a new neutron mirror made of deuterated Diamond-like carbon, INTERNATIONAL WORKSHOP ON NEUTRON OPTICS AND DETECTORS (NOP&D 2013), 10.1088/1742-6596/528/1/012010, 528, 1, 2014.01, We developed a new neutron mirror made of Diamond-like carbon (DLC). DLC is a film of amorphous carbon that has characteristics of both diamond and graphite. We produced DLC mirrors by ionization deposition method which is one of the chemical vapor deposition (CVD). Generally, DLC made by CVD contents a few tens of percentages of hydrogen. It decreases the Fermi potential of the DLC coating because hydrogen has negative Fermi potential. In order to increase the Fermi potential of the coating, we deuterated the DLC by using deuterated benzene for the source gas. The characteristics of the deuterated DLC(DDLC) coating was evaluated by RBS, ERDA, x-ray reflectivity, AFM. As a result, DDLC coating has 243neV due to deuteration, which is the same level as Ni. The RMS of height of the DDLC was 0.6nm so that the DDLC coating can be applied for a focusing mirror or specular transportation of pulsed neutron. Besides, we also develop Hydrogen/Deuterium DLC multiple layer mirror. So far, 4 layers mirror has been succeeded..
69. Dai Sakurai, Junsei Chiba, Takashi Ino, Nobunori Kakusho, Naokatsu Kaneko, Ryo Katayama, Masaaki Kitaguchi, Kenji Mishima, Suguru Muto, Kazuhide Ozeki, Yoshichika Seki, Hirohiko M. Shimizu, Satoru Yamashita, Tamaki Yoshioka, Daiki Nishimura, Development of a new neutron mirror made of deuterated Diamond-like carbon, Journal of Physics: Conference Series, 10.1088/1742-6596/528/1/012010, 528, 1, 2014.01, We developed a new neutron mirror made of Diamond-like carbon (DLC). DLC is a film of amorphous carbon that has characteristics of both diamond and graphite. We produced DLC mirrors by ionization deposition method which is one of the chemical vapor deposition (CVD). Generally, DLC made by CVD contents a few tens of percentages of hydrogen. It decreases the Fermi potential of the DLC coating because hydrogen has negative Fermi potential. In order to increase the Fermi potential of the coating, we deuterated the DLC by using deuterated benzene for the source gas. The characteristics of the deuterated DLC(DDLC) coating was evaluated by RBS, ERDA, x-ray reflectivity, AFM. As a result, DDLC coating has 243neV due to deuteration, which is the same level as Ni. The RMS of height of the DDLC was 0.6nm so that the DDLC coating can be applied for a focusing mirror or specular transportation of pulsed neutron. Besides, we also develop Hydrogen/Deuterium DLC multiple layer mirror. So far, 4 layers mirror has been succeeded. © Published under licence by IOP Publishing Ltd..
70. Ryo Katayama, Kenji Mishima, Satoru Yamashita, Dai Sakurai, Masaaki Kitaguchi, Tamaki Yoshioka, Yoshichika Seki, Development of a simulation for measuring neutron electric dipole moment, Journal of Physics: Conference Series, 10.1088/1742-6596/528/1/012031, 528, 1, 2014.01, The neutron electric dipole moment (nEDM) is sensitive to new physics beyond the standard model and could prove to be a new source of CP violation. Several experiments are being planned worldwide for its high-precision measurement. The nEDM is measured as the ultracold neutron (UCN) spin precession in a storage bottle under homogeneous electric and magnetic fields. In nEDM measurement, the systematic uncertainties are due to the motion of the UCNs, the geometry of the measurement system, and inhomogeneous electric and magnetic fields. Therefore, it is essential to quantitatively understand these effects in order to reduce them. Geant4UCN is an ideal simulation framework because it can compute the UCN trajectory, evaluate the time evolution of the spin precession due to arbitrary electric and magnetic fields, and define the storage geometry flexibly. We checked how accurately Geant4UCN can calculate the spin precession. We found that because of rounding errors, it cannot simulate it accurately enough for nEDM experiments, assuming homogeneous electric and magnetic fields with strengths of 10 kV/cm and 1 μT, respectively, and 100 s of storage. In this paper, we report on its discrepancies and describe a solution. © Published under licence by IOP Publishing Ltd..
71. Taikan Suehara, H. Hirai, H. Sumida, H. Ueno, Y. Sudo, Tamaki Yoshioka, Kiyotomo Kawagoe, Hybrid ECAL Optimization and related developments, 2014.01.
72. K. Mishima, S. Imajo, M. Hino, T. Ino, Y. Iwashita, R. Katayama, M. Kitaguchi, T. Oda, H. M. Shimizu, M. Utsuro, S. Yamashita, T. Yoshioka, Production of Ultra Cold Neutrons by a Doppler Shifter with Pulsed Neutrons at J-PARC, INTERNATIONAL WORKSHOP ON NEUTRON OPTICS AND DETECTORS (NOP&D 2013), 10.1088/1742-6596/528/1/012030, 528, 1, 2014.01, Ultracold neutrons (UCNs) are neutrons whose kinetic energy is around a few hundred nanoelectronvolts. Neutrons with such small kinetic energy can be trapped in a material vessel or magnetic fields. Because of these unique characteristics, UCNs are used for some important experiments of fundamental physics. The Doppler shifter is a device to produce UCN by slowing them down by the reflection on a mirror moving with half of the velocity of incoming neutrons. A Doppler shifter using a quadruple-stack of monochromatic supermin-ors that reflects neutrons with a velocity around 68m/s [1, Hino et al. (2010)] was fabricated, and operated with a pulsed neutron source of J-PARC. An important feature of the Doppler shifter is the use of a pulsed neutron beam Unlike in continuous neutron beams, the neutron velocity can be selected by choosing a time slice in a pulsed neutron bunch. Thus the UCN production improves by similar to 80 times in the case of J-PARC. We successfully produced the UCNs by the Doppler shifter: the measured UCN production rate is consistent with the simulations..
73. S. Imajo, Y. Iwashita, H. M. Shimizu, M. Kitaguchi, S. Yamashita, Y. Arimoto, Tamaki Yoshioka, Y. Seki, The development of a low energy neutron accelerator for rebunching pulsed neutrons, 5th International Particle Accelerator Conference, IPAC 2014 IPAC 2014 Proceedings of the 5th International Particle Accelerator Conference, 751-753, 2014.01.
74. C. Adloff, J. -J. Blaising, M. Chefdeville, C. Drancourt, R. Gaglione, N. Geffroy, Y. Karyotakis, I. Koletsou, J. Prast, G. Vouters, K. Francis, J. Repond, J. Schlereth, J. Smith, L. Xia, E. Baldolemar, J. Li, S. T. Park, M. Sosebee, A. P. White, J. Yu, G. Eigen, Y. Mikami, N. K. Watson, G. Mavromanolakis, M. A. Thomson, D. R. Ward, W. Yan, D. Benchekroun, A. Hoummada, Y. Khoulaki, J. Apostolakis, D. Dannheim, A. Dotti, G. Folger, V. Ivantchenko, W. Klempt, E. van der Kraaij, A. -I. Lucaci-Timoce, A. Ribon, D. Schlatter, V. Uzhinskiy, C. Carloganu, P. Gay, S. Manen, L. Royer, M. Tytgat, N. Zaganidis, G. C. Blazey, A. Dyshkant, J. G. R. Lima, V. Zutshi, J. -Y. Hostachy, L. Morin, U. Cornett, D. David, G. Falley, K. Gadow, P. Goettlicher, C. Guenter, O. Hartbrich, B. Hermberg, S. Karstensen, F. Krivan, K. Krueger, S. Lu, S. Morozov, V. Morgunov, M. Reinecke, F. Sefkow, P. Smirnov, M. Terwort, N. Feege, E. Garutti, S. Laurien, I. Marchesini, M. Matysek, M. Ramilli, K. Briggl, P. Eckert, T. Harion, H. -Ch. Schultz-Coulon, W. Shen, R. Stamen, B. Bilki, E. Norbeck, Y. Onel, G. W. Wilson, K. Kawagoe, Y. Sudo, T. Yoshioka, P. D. Dauncey, A. -M. Magnan, V. Bartsch, M. Wing, F. Salvatore, E. Cortina Gil, S. Mannai, G. Baulieu, P. Calabria, L. Caponetto, C. Combaret, R. Della Negra, G. Grenier, R. Han, J-C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, W. Tromeur, M. Vander Donckt, Y. Zoccarato, E. Calvo Alamillo, M. -C. Fouz, J. Puerta-Pelayo, F. Corriveau, B. Bobchenko, M. Chadeeva, M. Danilov, A. Epifantsev, O. Markin, R. Mizuk, E. Novikov, V. Popov, V. Rusinov, E. Tarkovsky, N. Kirikova, V. Kozlov, P. Smirnov, Y. Soloviev, P. Buzhan, A. Ilyin, V. Kantserov, V. Kaplin, A. Karakash, E. Popova, V. Tikhomirov, C. Kiesling, K. Seidel, F. Simon, C. Soldner, M. Szalay, M. Tesar, L. Weuste, M. S. Amjad, J. Bonis, S. Callier, S. Conforti di Lorenzo, P. Cornebise, Ph. Doublet, F. Dulucq, J. Fleury, T. Frisson, N. van der Kolk, H. Li, G. Martin-Chassard, F. Richard, Ch. de la Taille, R. Poeschl, L. Raux, J. Rouene, N. Seguin-Moreau, M. Anduze, V. Balagura, V. Boudry, J-C. Brient, R. Cornat, M. Frotin, F. Gastaldi, E. Guliyev, Y. Haddad, F. Magniette, G. Musat, M. Ruan, T. H. Tran, H. Videau, B. Bulanek, J. Zacek, J. Cvach, P. Gallus, M. Havranek, M. Janata, J. Kvasnicka, D. Lednicky, M. Marcisovsky, I. Polak, J. Popule, L. Tomasek, M. Tomasek, P. Ruzicka, P. Sicho, J. Smolik, V. Vrba, J. Zalesak, B. Belhorma, H. Ghazlane, K. Kotera, T. Takeshita, S. Uozumi, D. Jeans, M. Goetze, J. Sauer, S. Weber, C. Zeitnitz, Track segments in hadronic showers in a highly granular scintillator-steel hadron calorimeter, JOURNAL OF INSTRUMENTATION, 10.1088/1748-0221/8/09/P09001, 8, 9, 2013.09, We investigate the three dimensional substructure of hadronic showers in the CAL-ICE scintillator-steel hadronic calorimeter. The high granularity of the detector is used to find track segments of minimum ionising particles within hadronic showers, providing sensitivity to the spatial structure and the details of secondary particle production in hadronic cascades. The multiplicity, length and angular distribution of identified track segments are compared to GEANT4 simulations with several different shower models. Track segments also provide the possibility for in-situ calibration of highly granular calorimeters..
75. C. Adloff, J. Blaha, J. J. Blaising, C. Drancourt, A. Espargilière, R. Gaglione, N. Geffroy, Y. Karyotakis, J. Prast, G. Vouters, K. Francis, J. Repond, J. Schlereth, J. Smith, L. Xia, E. Baldolemar, J. Li, S. T. Park, M. Sosebee, A. P. White, J. Yu, T. Buanes, G. Eigen, Y. Mikami, N. K. Watson, G. Mavromanolakis, M. A. Thomson, D. R. Ward, W. Yan, D. Benchekroun, A. Hoummada, Y. Khoulaki, J. Apostolakis, A. Dotti, G. Folger, V. Ivantchenko, V. Uzhinskiy, M. Benyamna, C. Cârloganu, F. Fehr, P. Gay, S. Manen, L. Royer, G. C. Blazey, A. Dyshkant, J. G.R. Lima, V. Zutshi, J. Y. Hostachy, L. Morin, U. Cornett, D. David, G. Falley, K. Gadow, P. Göttlicher, C. Günter, B. Hermberg, S. Karstensen, F. Krivan, A. I. Lucaci-Timoce, S. Lu, B. Lutz, S. Morozov, V. Morgunov, M. Reinecke, F. Sefkow, P. Smirnov, M. Terwort, A. Vargas-Trevino, N. Feege, E. Garutti, I. Marchesini, M. Ramilli, P. Eckert, T. Harion, A. Kaplan, H. Ch Schultz-Coulon, W. Shen, R. Stamen, B. Bilki, E. Norbeck, Y. Onel, G. W. Wilson, K. Kawagoe, P. D. Dauncey, A. M. Magnan, V. Bartsch, M. Wing, F. Salvatore, E. Calvo Alamillo, M. C. Fouz, J. Puerta-Pelayo, B. Bobchenko, M. Chadeeva, M. Danilov, A. Epifantsev, O. Markin, R. Mizuk, E. Novikov, V. Popov, V. Rusinov, E. Tarkovsky, N. Kirikova, V. Kozlov, P. Smirnov, Y. Soloviev, P. Buzhan, A. Ilyin, V. Kantserov, V. Kaplin, A. Karakash, E. Popova, V. Tikhomirov, C. Kiesling, K. Seidel, F. Simon, C. Soldner, M. Szalay, M. Tesar, L. Weuste, M. S. Amjad, J. Bonis, S. Callier, S. Conforti Di Lorenzo, P. Cornebise, Ph Doublet, F. Dulucq, J. Fleury, T. Frisson, N. Van Der Kolk, H. Li, G. Martin-Chassard, F. Richard, Ch De La Taille, R. Pöschl, L. Raux, J. Rouëné, N. Seguin-Moreau, M. Anduze, V. Boudry, J. C. Brient, D. Jeans, P. Mora De Freitas, G. Musat, M. Reinhard, M. Ruan, H. Videau, B. Bulanek, J. Zacek, J. Cvach, P. Gallus, M. Havranek, M. Janata, J. Kvasnicka, D. Lednicky, M. Marcisovsky, I. Polak, J. Popule, L. Tomasek, M. Tomasek, P. Ruzicka, P. Sicho, J. Smolik, V. Vrba, J. Zalesak, B. Belhorma, H. Ghazlane, T. Takeshita, S. Uozumi, M. Götze, O. Hartbrich, J. Sauer, S. Weber, C. Zeitnitz, Validation of GEANT4 Monte Carlo models with a highly granular scintillator-steel hadron calorimeter, Journal of Instrumentation, 10.1088/1748-0221/8/07/P07005, 8, 7, 2013.07, Calorimeters with a high granularity are a fundamental requirement of the Particle Flow paradigm. This paper focuses on the prototype of a hadron calorimeter with analog readout, consisting of thirty-eight scintillator layers alternating with steel absorber planes. The scintillator plates are finely segmented into tiles individually read out via Silicon Photomultipliers. The presented results are based on data collected with pion beams in the energy range from 8 GeV to 100 GeV. The fine segmentation of the sensitive layers and the high sampling frequency allow for an excellent reconstruction of the spatial development of hadronic showers. A comparison between data and Monte Carlo simulations is presented, concerning both the longitudinal and lateral development of hadronic showers and the global response of the calorimeter. The performance of several GEANT4 physics lists with respect to these observables is evaluated. © CERN 2013..
76. S. Imajo, Y. Iwashita, P. Geltenbort, Y. Arimoto, H. M. Shimizu, M. Kitaguchi, Tamaki Yoshioka, Y. Seki, Rebunching ultracold neutrons by magnetic deceleration for the neutron edm experimental at J-parc, 4th International Particle Accelerator Conference, IPAC 2013 IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference, 1187-1189, 2013.01.
77. Yasushi Arimoto, Peter Gertenbort, Sohei Imajo, Yoshihisa Iwashita, Masaaki Kitaguchi, Yoshichika Seki, Hirohiko M. Shimizu, Tamaki Yoshioka, Demonstration of focusing by a neutron accelerator, Physical Review A - Atomic, Molecular, and Optical Physics, 10.1103/PhysRevA.86.023843, 86, 2, 2012.08, Space-time focusing was demonstrated by a neutron accelerator. Test experiments were performed by using very slow neutrons at High-Flux Reactor at Institut Laue-Langevin. Focusing of neutrons at the detector position through the accelerator was observed. Focusing neutrons enables us to transport the neutrons while maintaining density from source to experimental position. This will be a powerful technique for measurement of the permanent electric dipole moment of neutrons, which require a high density of neutrons. © 2012 American Physical Society..
78. Yasushi Arimoto, Yoshihisa Iwashita, Tamaki Yoshioka, Masaaki Kitaguchi, Sohei Imajo, Hirohiko M. Shimizu, Koichiro Asahi, Takashi Ino, Yoshio Kamiya, Kenji Mishima, Suguru Muto, Kenji Sakai, Tatsushi Shima, Kaoru Taketani, Satoru Yamashita, Akihiro Yoshimi, Development of longitudinal-gradient magnet for time focusing of ultra-cold neutron with anisotropic inter-pole, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2012.2183569, 22, 3, 2012.01, Ultra-cold neutron (UCN) is attractive for a search of the neutron electric dipole moment (nEDM). It is crucial to store UCNs with high density in a bottle for nEDM measurement apparatus. To increase the density, time focusing technique can be useful, where slow neutrons are accelerated and fast neutrons are decelerated by using magnetic potential. This device is called rebuncher. The rebuncher consists of a gradient magnet, RF coil, and neutron guide. The magnet generates a field gradient of 3.5 T/m (from 1 T to 0.2 T within 24 cm) in the longitudinal direction. By using anisotropic inter-poles, the magnet is compact and keeps the gradient uniform. The fabricated magnet showed good performance as designed. © 2012 IEEE..
79. Yasushi Arimoto, Haruhiko Funahashi, Nao Higashi, Masahiro Hino, Katsuya Hirota, Shohei Imajo, Takashi Ino, Yoshihisa Iwashita, Ryo Katayama, Masaaki Kitaguchi, Kenji Mishima, Suguru Muto, Hideyuki Oide, Hidetoshi Otono, Yoshichika Seki, Tatsushi Shima, Hirohiko M. Shimizu, Kaoru Taketani, Takahiro Yamada, Satoru Yamashita, Tamaki Yoshioka, Present status of neutron fundamental physics at J-PARC, Progress of Theoretical and Experimental Physics, 10.1093/ptep/pts075, 2012, 1, 2012.01, A neutron beamline for the study of fundamental physics has been constructed at the spallation neutron source of the Japan Proton Accelerator Research Complex (J-PARC). In-flight measurement of the neutron lifetime and the development of the transport optics of ultracold neutrons are in progress. The present status of the beamline and these experiments is reported..
80. Yasushi Arimoto, Haruhiko Funahashi, Nao Higashi, Masahiro Hino, Katsuya Hirota, Shohei Imajo, Takashi Ino, Yoshihisa Iwashita, Ryo Katayama, Masaaki Kitaguchi, Kenji Mishima, Suguru Muto, Hideyuki Oide, Hidetoshi Otono, Yoshichika Seki, Tatsushi Shima, Hirohiko M. Shimizu, Kaoru Taketani, Takahiro Yamada, Satoru Yamashita, Tamaki Yoshioka, Present status of neutron fundamental physics at J-PARC, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 10.1093/ptep/pts075, 1, 2012.01, A neutron beamline for the study of fundamental physics has been constructed at the spallation neutron source of the Japan Proton Accelerator Research Complex (J-PARC). In-flight measurement of the neutron lifetime and the development of the transport optics of ultracold neutrons are in progress. The present status of the beamline and these experiments is reported..
81. Y. Iwashita, S. Imajo, M. Kitaguchi, Y. Arimoto, H. M. Shimizu, Tamaki Yoshioka, Y. Seki, P. Geltenbort, Rebunching low energy neutrons by magnetic acceleration and deceleration, 3rd International Particle Accelerator Conference 2012, IPAC 2012 IPAC 2012 - International Particle Accelerator Conference 2012, 2766-2768, 2012.01.
82. T. Ino, Y. Arimoto, T. Yoshioka, K. Mishima, K. Taketani, S. Muto, H. M. Shimizu, H. Kira, Y. Sakaguchi, T. Oku, K. Sakai, T. Shinohara, J. Suzuki, H. Otono, H. Oide, S. Yamashita, S. Imajo, H. Funahashi, M. Yamada, Y. Iwashita, M. Kitaguchi, M. Hino, Z. Suzuki, T. Sanuki, T. Seki, K. Hirota, K. Ikeda, H. Sato, Y. Otake, H. Ohmori, T. Morishima, T. Shima, Measurement of the neutron beam polarization of BL05/NOP beamline at J-PARC, PHYSICA B-CONDENSED MATTER, 10.1016/j.physb.2011.01.009, 406, 12, 2424-2428, 2011.06, We measured the neutron beam polarization of the BL05/NOP (Neutron Optics and Physics) beamline at J-PARC with an accuracy of less than 10(-3) using polarized He-3 gas as a neutron spin analyzer. Precise polarimetry of the neutron beam is necessary to understand the beamline optics as well as for the asymmetry measurements of the neutron beta decay, which are planned in this beamline. (C) 2011 Elsevier B.V. All rights reserved..
83. K. Taketani, T. Ebisawa, M. Hino, K. Hirota, T. Ino, M. Kitaguchi, K. Mishima, S. Muto, H. Oide, T. Oku, H. Otono, K. Sakai, T. Shima, H. M. Shimizu, S. Yamashita, T. Yoshioka, A high S/N ratio spin flip chopper system for a pulsed neutron source, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2010.06.357, 634, 1 SUPPL., 2011.04, We report a successful demonstration of a high S/N ratio spin flip chopper (SFC) system for pulsed neutron sources. The system consists of two SFCs and each SFC consists of a radio frequency (RF) flipper and Soller magnetic supermirrors. The aperture of the Soller mirror was 18 mm in width and 20 mm in height. The S/N ratio of the system was 306:1. This system is going to be installed to measure neutron lifetime precisely using the cold-neutron beam line, BL05 polarized-beam branch, at the Materials and Life Science Experimental Facility (MLF) in Japan Proton Accelerator Research Complex (J-PARC). © 2010 Elsevier B.V. All rights reserved..
84. H. M. Shimizu, Y. Iwashita, M. Kitaguchi, K. Mishima, T. Yoshioka, A transport optics for pulsed ultracold neutron sources, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2010.06.210, 634, 1 SUPPL., 2011.04, High-density ultracold neutron (UCN) is commonly desired for the improvement of the experimental sensitivity to measure the electric dipole moment of neutrons. We discuss a method to suppress the decrease of the UCN density in transporting UCNs to the spatially separated storage volume by changing the UCN velocity synchronizing to the UCN time-of-flight. © 2010 Elsevier B.V. All rights reserved..
85. Takashi Ino, Takenao Shinohara, Tomohiro Adachi, Katsuya Hirota, Masahiro Hino, Takayuki Oku, Kaoru Taketani, Kenji Mishima, Tamaki Yoshioka, Yasushi Arimoto, Suguru Muto, Jun Ichi Suzuki, Hirohiko M. Shimizu, Development of thin film neutron focusing lenses, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2010.05.046, 634, 1 SUPPL., 2011.04, We have developed thin film Fresnel lenses made of a hydrogen-free amorphous polymer for neutron focusing purposes. A neutron beam test showed the strong focusing of a cold neutron beam, and an increase of the neutron intensity was observed to be more than 50 times. © 2010 Elsevier B.V. All rights reserved..
86. Tamaki Yoshioka, Kenji Mishima, Takashi Ino, Kaoru Taketani, Suguru Muto, Takahiro Morishima, Hirohiko M. Shimizu, Takayuki Oku, Junichi Suzuki, Takenao Shinohara, Kenji Sakai, Hiromi Sato, Katsuya Hirota, Yoshie Otake, Masaaki Kitaguchi, Masahiro Hino, Yoshichika Seki, Yoshihisa Iwashita, Masako Yamada, Masahiro Ichikawa, Takanori Sugimoto, Shinsuke Kawasaki, Sachio Komamiya, Hidetoshi Otono, Yoshio Kamiya, Satoru Yamashita, Peter Geltenbort, Polarization of very cold neutron using a permanent magnet quadrupole, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2010.05.029, 634, 1 SUPPL., 2011.04, For the future fundamental physics experiments by using cold neutrons, we are developing a device which can measure the neutron polarization degree by accuracy significantly below 10 . A quadrupole magnet is one of the promising candidate to measure the neutron polarization degree by such extremely high precision. We have performed a polarization experiment by using the quadrupole magnets at the Very Cold Neutron (VCN) port of the PF-2 in the Institute Laue-Langevin (ILL). As a result, we obtained the polarization degree P with very high accuracy P=0.9994±0.0001(stat.)±0.0003(syst.), which meet our requirement significantly. © 2010 Elsevier B.V. All rights reserved. -3.
87. Y. Arimoto, T. Yoshioka, H. M. Shimizu, K. Mishima, T. Ino, K. Taketani, S. Muto, M. Kitaguchi, S. Imajo, Y. Iwashita, S. Yamashita, Y. Kamiya, A. Yoshimi, K. Asahi, T. Shima, K. Sakai, Longitudinal-gradient magnet for time focusing of ultra-cold neutrons, Physics Procedia, 10.1016/j.phpro.2011.06.013, 17, 20-29, 2011.01, A gradient DC magnet is designed using 3D magnetic field analysis code. This magnet, referred to as a B magnet, is one of the key elements of a time-focusing device for ultra-cold neutrons (UCNs) based on a radio frequency gradient flipper - a so-called rebuncher. The magnet generates a guide and a potential field that interacts with the magnetic moment of UCNs and its main body comprises a C-shaped yoke made from iron. A field gradient is generated by a pole arrangement that includes an anisotropic inter-pole, which causes the fringe field to be uniform in the longitudinal direction even when the pole gap distance changes. The designed magnet has the following properties: (1) a maximum B-field of 10 kGauss, decreasing to 2 kGauss at a longitudinal distance of 25 cm, with a gradient of less than 400 Gauss/cm, (2) variations in the fringe field along the y direction is less than 4% over a range of -3 cm≤ y ≤ 3 cm at any z position in the spin-flipping region. Tracking simulations show that the B magnet is capable of accepting UCNs in the velocity range 2.3∼3.3 m/s. © 2011 Published by Elsevier B.V. 0 0.
88. H. Otono, H. Oide, S. Yamashita, T. Yoshioka, On the basic mechanism of Pixelized Photon Detectors, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2009.05.139, 610, 1, 397-399, 2009.10, A Pixelized Photon Detector (PPD) is a generic name for the semiconductor devices operated in the Geiger-mode, such as Silicon PhotoMultiplier and Multi-Pixel Photon Counter, which has high photon counting capability. While the internal mechanisms of the PPD have been intensively studied in recent years, the existing models do not include the avalanche process. We have simulated the multiplication and quenching of the avalanche process and have succeeded in reproducing the output waveform of the PPD. Furthermore our model predicts the existence of dead-time in the PPD which has never been numerically predicted. For searching the dead-time, we also have developed waveform analysis method using deconvolution which has the potential to distinguish neighboring pulses precisely. In this paper, we discuss our improved model and waveform analysis method. © 2009 Elsevier B.V. All rights reserved..
89. Masako Yamada, Yoshihisa Iwashita, Masahiro Ichikawa, Takanori Sugimoto, Hiromu Tongu, Hiroshi Fujisawa, Hirohiko M. Shimizu, Takashi Ino, Kenji Mishima, Kaoru Taketani, Tamaki Yoshioka, Suguru Muto, Takahiro Morishima, Takayuki Oku, Jun ichi Suzuki, Takenao Shinohara, Kenji Sakai, Hiromi Sato, Katsuya Hirota, Yoshie Otake, Yoshichika Seki, Shinsuke Kawasaki, Sachio Komamiya, Yoshio Kamiya, Hidetoshi Otono, Satoru Yamashita, Peter Geltenbort, Development of modulating permanent magnet sextupole lens for focusing of pulsed cold neutrons, Physica B: Condensed Matter, 10.1016/j.physb.2009.06.132, 404, 17, 2646-2651, 2009.09, Modulating permanent magnet sextupole lens (PMSx) for focusing pulsed cold neutrons is under development. The synchronized modulation of its field gradient suppresses the chromatic aberration which arises from the Time Of Flight method. The strength of the magnetic field, the torque, and the rise of temperature during its operation are studied on a fabricated prototype. Experiments on focusing pulsed very cold neutrons (VCN) at ILL (Institute of Laue Langevin, France) were carried out and VCN with around λ=40 Å were focused by the PMSx at a focal length of about 0.5 m. The experimental results are presented in conjunction with the principle of the neutron focusing and the modulating method of the focal strength of permanent magnet lens with the double ring structure. © 2009 Elsevier B.V. All rights reserved..
90. Kaoru Taketani, Kenji Mishima, Takashi Ino, Tamaki Yoshioka, Suguru Muto, Takahiro Morishima, Hirohiko M. Shimizu, Takayuki Oku, Junichi Suzuki, Takenao Shinohara, Kenji Sakai, Hiromi Sato, Katsuya Hirota, Yoshie Otake, Masaaki Kitaguchi, Masahiro Hino, Yoshichika Seki, Yoshihisa Iwashita, Masako Yamada, Masahiro Ichikawa, Takanori Sugimoto, Shinsuke Kawasaki, Sachio Komamiya, Yoshio Kamiya, Hidetoshi Otono, Satoru Yamashita, Peter Geltenbort, Highly polarized very cold neutrons through a permanent magnet quadrupole, Physica B: Condensed Matter, 10.1016/j.physb.2009.06.045, 404, 17, 2643-2645, 2009.09, We obtained highly polarized very cold neutrons through a quadrupole magnet with a large aperture. When neutrons go through a quadrupole magnet, parallel-spin neutrons are attracted to the magnet axis and anti-parallel-spin neutrons are repelled off the axis. Therefore, the neutrons through a sufficiently long quadrupole magnet have completely parallel-spin. At the downstream of the quadrupole magnet, we placed another quadrupole magnet to divide neutrons into two regions depending on their spin directions. We obtained the neutron polarization from the integrated count of the two regions and found it was 99.88±0.09 (stat.)±0.05 (syst.)%. © 2009 Elsevier B.V. All rights reserved..
91. A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, J. Ives, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, A. P. Kozhevnikov, Yu G. Kudenko, A. Kushnirenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. MacDonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, V. A. Mukhin, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, S. V. Petrenko, R. Poutissou, E. J. Ramberg, G. Redlinger, T. Sato, Tamaki Yoshioka, Study of the decay K+→π+νν? in the momentum region 140Physical Review D - Particles, Fields, Gravitation and Cosmology, 10.1103/PhysRevD.79.092004, 79, 9, 2009.05.
92. A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. -H. Chiang, I. -A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, J. Ives, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, A. P. Kozhevnikov, Yu. G. Kudenko, A. Kushnirenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. Macdonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, V. A. Mukhin, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, S. V. Petrenko, R. Poutissou, E. J. Ramberg, G. Redlinger, T. Sato, T. Sekiguchi, T. Shinkawa, R. C. Strand, S. Sugimoto, Y. Tamagawa, R. Tschirhart, T. Tsunemi, D. V. Vavilov, B. Viren, Zhe Wang, N. V. Yershov, Y. Yoshimura, T. Yoshioka, Study of the decay K+ -> pi(+) nu(nu)over-bar in the momentum region 140 < P-pi < 199 MeV/c, PHYSICAL REVIEW D, 10.1103/PhysRevD.79.092004, 79, 9, 2009.05, Experiment E949 at Brookhaven National Laboratory has observed three new events consistent with the decay K+ -> pi(+) nu(nu) over bar in the pion momentum region 140 < P-pi < 199 MeV/c in an exposure of 1.71 x 10(12) stopped kaons with an estimated total background of 0.93 +/- 0.17(stat)(-0.24)(+0.32) (syst) events. This brings the total number of observed K+ -> pi(+)nu(nu) over bar events to seven. Combining this observation with previous results, assuming the pion spectrum predicted by the standard model, results in a branching ratio of B(K+ -> pi(+)nu(nu) over bar) = 1.73(+1.15)(-1.05) x 10(-10). An interpretation of the results for alternative models of the decay K+ -> pi(+) + nothing is also presented..
93. Hideo Itoh, Katsumasa Ikematsu, Keisuke Fujii, Hitoshi Hano, Nobuchika Okada, Tamaki Yoshioka, Hidden particle production at the ILC, 8th General Meeting of the ILC Physics Working Group Proceedings of the ILC Physics Working Group Meetings at KEK in the Period from May 2007 to June 2009, 98-112, 2009.01.
94. A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, J. Ives, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, A. P. Kozhevnikov, Yu G. Kudenko, A. Kushnirenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. MacDonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, V. A. Mukhin, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, S. V. Petrenko, R. Poutissou, E. J. Ramberg, G. Redlinger, T. Sato, Tamaki Yoshioka, New measurement of the K+→π+νν? branching ratio, Physical Review Letters, 10.1103/PhysRevLett.101.191802, 101, 19, 2008.11.
95. Keisuke Fujii, Hitoshi Hano, Hideo Itoh, Nobuchika Okada, Tamaki Yoshioka, Hidden particle production at the ILC, Physical Review D - Particles, Fields, Gravitation and Cosmology, 10.1103/PhysRevD.78.015008, 78, 1, 2008.07, In a class of new physics models, the new physics sector is completely or partly hidden, namely, a singlet under the standard model (SM) gauge group. Hidden fields included in such new physics models communicate with the standard model sector through higher-dimensional operators. If a cutoff lies in the TeV range, such hidden fields can be produced at future colliders. We consider a scalar field as an example of the hidden fields. Collider phenomenology on this hidden scalar is similar to that of the SM Higgs boson, but there are several features quite different from those of the Higgs boson. We investigate productions of the hidden scalar at the International Linear Collider (ILC) and study the feasibility of its measurements, in particular, how well the ILC distinguishes the scalar from the Higgs boson, through realistic Monte Carlo simulations. © 2008 The American Physical Society..
96. S. Adler, V. V. Anisimovsky, M. Aoki, M. Ardebili, A. V. Artamonov, M. Atiya, B. Bassalleck, A. O. Bazarko, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, M. R. Convery, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Haggerty, J. Hu, T. Inagaki, M. M. Ito, A. P. Ivashkin, D. E. Jaffe, S. Kabe, M. Kazumori, Y. Kuno, M. Kuriki, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, A. P. Kozhevnikov, Yu G. Kudenko, A. Kushnirenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. Macdonald, D. R. Marlow, R. A. McPherson, P. D. Meyers, J. Mildenberger, O. V. Mineev, Tamaki Yoshioka, Measurement of the K+→π+νν? branching ratio, Physical Review D - Particles, Fields, Gravitation and Cosmology, 10.1103/PhysRevD.77.052003, 77, 5, 2008.03.
97. T. Yoshioka, Performance of GLD detector, Pramana - Journal of Physics, 10.1007/s12043-007-0238-7, 69, 6, 1115-1118, 2007.12, Most of the important physics processes to be studied in the international linear collider (ILC) experiment have multi-jets in the final state. In order to achieve better jet energy resolution, the so-called particle flow algorithm (PFA) will be employed and there is a general consensus that PFA derives overall ILC detector design. Four detector concepts for the ILC experiment have been proposed so far in the world; the GLD detector that has a large inner calorimeter radius, which is considered to have an advantage for a PFA, is one of them. In this paper, general scheme and performance of the GLD-PFA will be presented. © Indian Academy of Sciences..
98. S. Gomi, H. Hano, T. Iijima, S. Itoh, K. Kawagoe, S. H. Kim, T. Kubota, T. Maeda, T. Matsumura, Y. Mazuka, K. Miyabayashi, H. Miyata, T. Murakami, T. Nakadaira, T. Nakaya, H. Otono, E. Sano, T. Shinkawa, Y. Sudo, T. Takeshita, M. Taguchi, T. Tsubokawa, S. Uozumi, M. Yamaoka, H. Yamazaki, M. Yokoyama, K. Yoshimura, T. Yoshioka, Development and study of the multi pixel photon counter, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2007.08.020, 581, 1-2 SPEC. ISS., 427-432, 2007.10, The Multi Pixel Photon Counter is a novel semiconductor photon sensor which consists of 100-1600 micro APD pixels. Each pixel works in limited Geiger mode with an inverse bias voltage around 80 V. The MPPC has many remarkable features such as high gain, large photon detection efficiency, low cost and tolerance for magnetic field. Fundamental properties, such as the gain, dark noise rate and inter-pixel cross-talk, have been measured with three different samples which have 100, 400, and 1600 pixels. Variation of the gain over 750 samples, and uniformity of the gain and photon sensitivity within one pixel are also evaluated. As the result of the tests, it is confirmed that the MPPC has satisfactory performance for many applications, not only for high energy physics experiments but also for medical engineering systems. © 2007 Elsevier B.V. All rights reserved..
99. Hidetoshi Otono, S. Yamashita, Tamaki Yoshioka, H. Oide, T. Suehiro, H. Hano, Study of MPPC at liquid nitrogen temperature, Proceedings of Science, 2007.01.
100. H. Oide, Hidetoshi Otono, S. Yamashita, Tamaki Yoshioka, H. Hano, T. Suehiro, Study of afterpulsing of MPPC with waveform analysis, Proceedings of Science, 2007.01.
101. Y. Tamagawa, H. Shirasaka, M. Kobayashi, T. K. Komatsubara, K. Mimori, K. Omata, T. Sekiguchi, S. Sugimoto, T. Tsunemi, T. Yoshioka, Y. Yoshimura, T. Fujiwara, Performance of connected GSO bars, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2006.02.189, 562, 1, 120-126, 2006.06, The performance of connected GSO (Gd SiO :Ce) bars was investigated using a proton beam of 0.6-1.0 GeV/c. Single crystals of 20 cm-long GSO with different Ce concentrations (1.5, 0.5 mol%) and cross-sections (1×1 cm , 2×2 cm ) were prepared. Long GSO bars were constructed by connecting two crystals of the same type with or without a 10 cm-long plastic scintillator between the crystals. The position dependences of the pulse height, energy resolution and time resolution were investigated. At a typical proton momentum, 1.0 GeV/c, the best energy resolution was 4.8% for 2×2×20 cm GSO crystals doped with 0.5 mol% Ce due to the larger light yield, and the best position resolution was 0.55 cm for 1.5 mol% Ce due to the shorter attenuation length. © 2006 Elsevier B.V. All rights reserved. 2 5 2 2 3.
102. S. Gomi, M. Taguchi, H. Hano, S. Itoh, T. Kubota, X. Maeda, Y. Mazuka, H. Otono, E. Sano, Y. Sudo, T. Tsubokawa, M. Yamaoka, H. Yamazaki, S. Uozumi, T. Yoshioka, T. Lijima, K. Kawagoe, S. H. Kim, T. Matsumura, K. Miyabayashi, T. Murakami, T. Nakadaira, T. Nakaya, T. Shinkawa, T. Takeshita, M. Yokoyama, K. Yoshimura, Development of multi-pixel photon counters, IEEE Nuclear Science Symposium Conference Record, 10.1109/NSSMIC.2006.356040, 2, 1105-1111, 2006.01, The multi-pixel photon counter (MPPC) is a newly developed photodetector with an excellent photon counting capability. It also has many attractive features such as small size, high gain, low operation voltage and power consumption, and capability of operating in magnetic fields and in room temperature. The basic performance of samples has been measured. A gain of ∼10 is achieved with a noise rate less than 500 kHz with 1 p.e. threshold, and cross-talk probability of less than 40% at room temperature. The photon detection efficiency for green light is twice or more that of the photomultiplier tubes. It is found that the basic performance of the MPPC is satisfactory for use in real experiments. © 2006 IEEE. 6.
103. Masahito Yoshii, Shozo Anami, Yoshisato Funahashi, Eizi Ezura, Keigo Hara, Chihiro Ohmori, Akira Takagi, Makoto Toda, Kenji Ueno, Masahiro Nomura, Fumihiko Tamura, Masanobu Yamamoto, Alexander Schnase, Katsushi Hasegawa, Tamaki Yoshioka, Yuichi Morita, New cutting scheme of magnetic alloy cores for J-PARC synchrotrons, 10th European Particle Accelerator Conference, EPAC 2006 EPAC 2006 - Contributions to the Proceedings, 1313-1315, 2006.01.
104. A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, A. P. Kozhevnikov, Yu G. Kudenko, A. Kushnirenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. MacDonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, V. A. Mukhin, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, S. V. Petrenko, R. Poutissou, E. J. Ramberg, G. Redlinger, T. Sato, T. Sekiguchi, Tamaki Yoshioka, Upper limit on the branching ratio for the decay π0→νν?, Physical Review D - Particles, Fields, Gravitation and Cosmology, 10.1103/PhysRevD.72.091102, 72, 9, 2005.11.
105. AV Artamonov, B Bassalleck, B Bhuyan, EW Blackmore, DA Bryman, S Chen, IH Chiang, I-A Christidi, PS Cooper, MV Diwan, JS Frank, T Fujiwara, J Hu, DE Jaffe, S Kabe, SH Kettell, MM Khabibullin, AN Khotjantsev, P Kitching, M Kobayashi, TK Komatsubara, A Konaka, AP Kozhevnikov, YG Kudenko, A Kushnirenko, LG Landsberg, B Lewis, KK Li, LS Littenberg, JA Macdonald, J Mildenberger, OV Mineev, M Miyajima, K Mizouchi, VA Mukhin, N Muramatsu, T Nakano, M Nomachi, T Nomura, T Numao, VF Obraztsov, K Omata, DI Patalakha, SV Petrenko, R Poutissou, EJ Ramberg, G Redlinger, T Sato, T Sekiguchi, T Shinkawa, RC Strand, S Sugimoto, Y Tamagawa, R Tschirhart, T Tsunemi, DV Vavilov, B Viren, NV Yershov, Y Yoshimura, T Yoshioka, Upper limit on the branching ratio for the decay pi 0 -> vv(-), PHYSICAL REVIEW D, 10.1103/PhysRevD.72.091102, 72, 9, 2005.11, A sample of kinematically identified K+->pi(+)pi(0) decays obtained with the E949 detector was used to search for the helicity-suppressed decay pi(0)->nu(v) over bar(v) over bar resulting in an upper limit of 2.7x10(-7) at 90% confidence level. The upper limit is also applicable to pi(0) decays into unknown weakly-interacting particles..
106. A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, A. P. Kozhevnikov, Yu G. Kudenko, A. Kushnirenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. Macdonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, V. A. Mukhin, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, S. V. Petrenko, R. Poutissou, E. J. Ramberg, G. Redlinger, T. Sato, T. Sekiguchi, Tamaki Yoshioka, Search for the decay K+ → π+γγ in the π+ momentum region P > 213 MeV/c, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 10.1016/j.physletb.2005.07.057, 623, 3-4, 192-199, 2005.09.
107. Gerald Aarons, Toshinori Abe, Jason Abernathy, Medina Ablikim, Halina Abramowicz, David Adey, Catherine Adloff, Chris Adolphsen, Konstantin Afanaciev, Ilya Agapov, Jung Keun Ahn, Hiroaki Aihara, Mitsuo Akemoto, Maria Del CarmenAlabau, Justin Albert, Hartwig Albrecht, Michael Albrecht, David Alesini, Gideon Alexander, Jim Alexander, Wade Allison, John Amann, Ramila Amirikas, Qi An, Shozo Anami, B. Ananthanarayan, Terry Anderson, Ladislav Andricek, Marc Anduze, Michael Anerella, Nikolai Anfimov, Deepa Angal-Kalinin, Sergei Antipov, Claire Antoine, Mayumi Aoki, Atsushi Aoza, Steve Aplin, Rob Appleby, Yasuo Arai, Sakae Araki, Tug Arkan, Ned Arnold, Ray Arnold, Richard Arnowitt, Xavier Artru, Kunal Arya, Alexander Aryshev, Eri Asakawa, Fred Asiri, David Asner, Muzaffer Atac, Grigor Atoian, David Attié, Jean Eudes Augustin, David B. Augustine, Bradley Ayres, Tariq Aziz, Derek Baars, Frederique Badaud, Nigel Baddams, Jonathan Bagger, Sha Bai, David Bailey, Ian R. Bailey, David Baker, Nikolai I. Balalykin, Juan Pablo Balbuena, Jean Luc Baldy, Markus Ball, Maurice Ball, Alessandro Ballestrero, Jamie Ballin, Charles Baltay, Philip Bambade, Syuichi Ban, Henry Band, Karl Bane, Bakul Banerjee, Serena Barbanotti, Daniele Barbareschi, Angela Barbaro-Galtieri, Desmond P. Barber, Mauricio Barbi, Dmitri Y. Bardin, Barry Barish, Timothy L. Barklow, Roger Barlow, Virgil E. Barnes, Maura Barone, Christoph Bartels, Valeria Bartsch, Rahul Basu, Marco Battaglia, Yuri Batygin, Jerome Baudot, Ulrich Baur, D. Elwyn Baynham, Carl Beard, Chris Bebek, Philip Bechtle, Detector concepts, LCWS 2005 - 2005 International Linear Collider Workshop, 2005.01.
108. V. V. Anisimovsky, A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, A. P. Ivashkin, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, A. P. Kozhevnikov, Yu G. Kudenko, A. Kushnirenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. Macdonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, V. A. Mukhin, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, S. V. Petrenko, R. Poutissou, E. J. Ramberg, G. Redlinger, Tamaki Yoshioka, Improved measurement of the K+ → π+ νν? branching ratio, Physical Review Letters, 10.1103/PhysRevLett.93.031801, 93, 3, 31801, 2004.07.
109. T. Yoshioka, M. Nomachi, A. Artamanov, B. Bhuyan, J. S. Frank, T. Fujiwara, K. Higa, S. H. Kettell, T. K. Komatsubara, A. Konaka, A. Kozjevnikov, A. Kushnirenko, N. Muramatsu, T. Nakano, T. Nomura, S. Petrenko, R. Poutissou, G. Redlinger, T. Sekiguchi, T. Shinkawa, S. Sugimoto, T. Tsunemi, Upgrade of the level-0 trigger system for BNL-E949, IEEE Transactions on Nuclear Science, 10.1109/TNS.2004.828867, 51, 3 I, 334-339, 2004.06, A new programmable trigger board and digital mean-timer modules using complex programmable logic device have been introduced to the trigger system of the BNL-E949 experiment. The online dead time was reduced from 4.0% to 1.7% by introducing an on-chip prescaler to the programmable trigger board. The acceptance loss of the online photon veto was reduced from 4.9% to 1.8% by introducing the mean-timer modules..
110. M. Kobayashi, S. Sugimoto, Y. Yoshimura, T. K. Komatsubara, K. Mimori, K. Omata, T. Sekiguchi, T. Tsunemi, T. Yoshioka, Y. Tamagawa, H. Shirasaka, T. Fujiwara, Y. Usuki, M. Ishii, A beam test of PbWO4 Cherenkov radiators, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/S0168-9002(01)02010-1, 484, 1-3, 140-148, 2002.05, PbWO heavily doped with trivalent rare-earth ions like La , Gd , Y , etc. has recently been proposed as an excellent new, heavy and radiation-hard Cherenkov radiator, and the upper limit of the remaining scintillation light yield (LY) was obtained from measurement of radioisotope γ-rays. Since then, we have made a quantitative study of the remaining scintillation LY using a 0.5-1 GeV/c π /p/d beam. Compared with a standard PbWO :Gd(80atppm) scintillator, the scintillation LY is quenched to 4.8%, 6.0%, and 11.6% for La concentration of 8 at%, La of 5 at% and Gd of 3 at%, respectively. The scintillation LY remaining in PbWO :La(8at%) was as weak as 15% of the Cherenkov LY for relativistic charged particles. © 2001 Elsevier Science B.V. All rights reserved. 4 4 4 3+ 3+ 3+ + 3+ 3+ 3+.

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