記述言語：英語   掲載種別：研究論文（学術雑誌）  

Polarization transfer measurements for 12C(p,n)12N(g.s.,1+) at 296 MeV and nuclear correlation effects

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Complete set of polarization transfer coefficients for the 3He(p, n) reaction at 346 MeV and 0 degrees

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross sections and analyzing powers for (p, n) reactions on 3He and 4He at 346 MeV

記述言語：英語  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

New candidate for an alpha cluster condensed state in 16O(alpha,alpha') at 400 MeV

記述言語：英語  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Calibration of the effective analyzing power for a He-3 polarimeter at 443 MeV

DOI： 10.1016/S0168-9002(03)01436-0

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Polarization transfer in the O-16(p,p ') reaction at forward angles and structure of the spin-dipole resonances

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Search for narrow dibaryon resonances by the pd -> pdX and pd -> ppX reactions

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

(d)over-right-arrow-p and (n)over-right-arrow-d scatterings at intermediate energy and three-nucleon force effects

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Gamow-Teller strength in the continuum and quenching problem

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Strength observed in Gamow-Teller resonance plus continuum in the Al-27((p)over-right-arrow,(n)over-right-arrow) reaction at 295 MeV

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Polarized He-3 project at RIKEN

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Facility for the (p,n) polarization transfer measurement

記述言語：英語   出版者・発行元：Physical Review Letters  

To search for low-energy resonant structures in isospin T=3/2 three-body systems, we have performed the experiments H3(t,He3)3n and He3(He3,t)3p at intermediate energies. For the 3n experiment, we have newly developed a thick Ti-H3 target that has the largest tritium thickness among targets of this type ever made. The 3n experiment for the first time covered the momentum-transfer region as low as 15 MeV/c, which provides ideal conditions for producing fragile systems. However, in the excitation-energy spectra we obtained, we did not observe any distinct peak structures. This is in sharp contrast to tetraneutron spectra. The distributions of the 3n and 3p spectra are found to be similar, except for the displacement in energy due to Coulomb repulsion. Comparisons with theoretical calculations suggest that three-body correlations exist in the 3n and 3p systems, although not enough to produce a resonant peak.

DOI： 10.1103/PhysRevLett.133.012501

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記述言語：英語  

DOI： 10.1038/s41420-024-02083-3

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PubMed

出版者・発行元：Few-Body Systems  

We present the measured spin correlation coefficient Cy,y for p-3He elastic scattering at 100 MeV at the angles θc.m.=46.9∘–149.2∘ in the center of mass system. The experiment was performed using a 100 MeV polarized proton beam in conjunction with the polarized 3He target. Proton beams were injected to the target, and scattered protons were detected by using E-ΔE detectors which consisted of plastic and NaI(Tl) scintillators. The data are compared with rigorous numerical calculations based on realistic NN potentials as well as with the Δ-isobar excitation. The obtained results indicate that the Cy,y expands the knowledge of the nuclear interactions with Δ-isobar or those including 3NFs that are masked in nucleon-deuteron elastic scattering.

DOI： 10.1007/s00601-024-01891-8

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出版者・発行元：Nuovo Cimento della Societa Italiana di Fisica C  

Gamow-Teller (GT) transitions in an exotic neutron-rich nucleus 11Li have been measured via the 11Li(p,n)11Be reaction at 182 MeV/u in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center. The neutron detector array PANDORA and the SAMURAI spectrometer were used to detect recoil neutrons and decay products produced in the (p,n) reaction, respectively. Preliminary results of kinematic correlation of recoil neutrons, corresponding to GT transitions, are presented for several decay channels of 11Be reaction product. Fourteen decay channels with light-particle emission from 11Be excited states, including seven new channels, are identified, in addition to the non-particle-emission channel from 11Be ground or low-lying states.

DOI： 10.1393/ncc/i2024-24039-6

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出版者・発行元：Progress of Theoretical and Experimental Physics  

Much r esear ch in r ecent years has focused on cir cular accelera tors tha t accelera te and store secondary particles with a large momentum spread, such as muons, unstable nuclei, and heavy ions with different charge states. A fixed-field alternating gradient (FFAG) accel- erator with large transverse and momentum acceptance has ob vious advanta ges for such r equir ements. A versatile beam injection method is r equir ed to accelerate secondary parti- cles with a large momentum spread and different charge states with an FFAG accelerator. In the present study, a method for charge exchange injection of positi v e heavy ions using the large momentum acceptance of an FFAG accelerator is proposed. A charge injection system, which converts a He 1 + beam to a He 2 + beam, is de v eloped for a 150 MeV FFAG accelera tor a t the Center for Accelerator and Beam Applied Science (CABAS) of Kyushu Uni v ersity. As the first step to verify the injection method, an orbit shift from one charge state to the other is demonstrated. This is the first demonstration of heavy ion injection using an FFAG accelerator.

DOI： 10.1093/ptep/ptae017

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記述言語：英語   出版者・発行元：Oxford University Press (OUP)  

Much research in recent years has focused on circular accelerators that accelerate and store secondary particles with a large momentum spread, such as muons, unstable nuclei, and heavy ions with different charge states. A fixed-field alternating gradient (FFAG) accelerator with large transverse and momentum acceptance has obvious advantages for such requirements. A versatile beam injection method is required to accelerate secondary particles with a large momentum spread and different charge states with an FFAG accelerator. In the present study, a method for charge exchange injection of positive heavy ions using the large momentum acceptance of an FFAG accelerator is proposed. A charge injection system, which converts a He^<1+> beam to a He^<2+> beam, is developed for a 150 MeV FFAG accelerator at the Center for Accelerator and Beam Applied Science (CABAS) of Kyushu University. As the first step to verify the injection method, an orbit shift from one charge state to the other is demonstrated. This is the first demonstration of heavy ion injection using an FFAG accelerator.

CiNii Research

掲載種別：研究論文（学術雑誌）   出版者・発行元：Progress of Theoretical and Experimental Physics  

We have measured the differential cross section and analyzing power for (p, 2p) reactions that lead to discrete states of residual nuclei at an incident energy of 197 MeV for five kinds of target nuclei, 12C, 16O, 40,48Ca, and 90Zr. The data are compared with distorted-wave impulse approximation calculations using two kinds of global optical potentials. The spectroscopic factors obtained from these calculations agree with those determined in (e, e′p) studies within 20%, except for one orbital of the 90Zr nucleus where the distortion effect is much greater than that for the other orbitals of 90Zr and for other target nuclei. We also observed a clear and visibly distinct j-dependence in the analyzing power.

DOI： 10.1093/ptep/ptad116

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出版者・発行元：Results in Physics  

Background: In our previous paper, we tested the chiral (Kyushu) folding model for 12C+12C scattering, since the profile function in the Glauber mode is constructed for the system. We found that the folding model is reliable for reaction cross sections σR in 30≲Elab≲100MeV and 250≲Elab≲400MeV. Accurate data are available for 12C scattering on 9Be, 12C, 27Al targets in 30≲Elab≲400MeV. Purpose: We determine matter radius rm(exp) of 12C from the accurate σR(exp), using the Kyushu g-matrix folding model. Results: Our result is rm12(exp)=2.352±0.013 fm for 12C. The model is applied for the accurate data on 12C+27 Al scattering, and yields rm(exp)=2.936±0.012 fm for 27Al. Conclusion: Our conclusion is that rm(exp)=2.352±0.013 fm agrees with rm(exp)=2.35±0.02 fm determined from interaction cross sections by Tanihata et al.

DOI： 10.1016/j.rinp.2023.106675

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出版者・発行元：Results in Physics  

Background: The PREX group reported a new skin value, rskin208(PREX2)=0.283±0.071=0.212∼0.354fm. Using the chiral (Kyushu) g-matrix folding model with the proton and neutron densities determined with D1S+GHFB+AMP, we determined neutron skin thickness rskin208(exp)=0.278±0.035 fm from reaction cross sections σR(exp) of p+208Pb scattering, where D1S-GHFB+AMP denotes Gogny-D1S HFB with angular momentum projection (AMP). The method also yielded rskin208(exp)=0.416±0.146 from σR(exp) of 4He+208Pb scattering. In our previous work, we accumulated the 206 EoSs and determined a sloop parameter L=76∼165MeV from the 206 EoSs. The value of L yields rskin208=0.102∼0.354fm. As for 58Ni, a novel method for measuring nuclear reactions in inverse kinematics with stored ion beams was successfully used to extract matter radii rm of 58Ni at the GSI facility. Purpose: As the first aim, we first determine rskin208(exp) from σR(exp) of 3He scattering on 208Pb target and take the weighted mean and its error for rskin208(PREX2), three skin values of p+208Pb, 3,4He+208Pb scattering and rskin208=0.102∼0.354fm based on the 206 EoSs. As the second aim, we determine matter radii rm(exp) of 58,60,64Ni from σR(exp) of 3,4He scattering on 58,60,64Ni targets. Results: Our result is rskin208(exp)=0.512±0.268fm for 3He+208Pb scattering. Our results based on 4He+58,60,64Ni scattering are rm58(exp)=3.734±0.091 fm, rm60(exp)=3.815±0.094 fm, rm64(exp)=4.001±0.093 fm. Our results based on 3He+58,60,64Ni scattering are rm58(exp)=3.709±0.098 fm, rm60(exp)=3.753±0.112 fm, rm64(exp)=3.822±0.142 fm. Conclusion: Our conclusion is rskin208=0.285±0.030fm. It is determined from the 5 skin values mentioned above.

DOI： 10.1016/j.rinp.2023.106649

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出版者・発行元：Results in Physics  

Background: In our previous work, we determined matter radii rm(exp) and neutron-skin thickness rskin(exp) from reaction cross sections σR(exp) of proton scattering on 208Pb, 58Ni, 40,48Ca, 12C targets, using the chiral (Kyushu) g-matrix folding model with the densities calculated with Gogny-D1S-HFB (D1S-GHFB) with angular momentum projection (AMP). The resultant rskin(exp) agree with the PREX2 and CREX values. As for 58Ni, our value is consistent with one determined from the differential cross section for 58Ni＋4He scattering. As for p＋60,62,64N scattering, σR(exp) are available as a function of incident energies Ein, where Ein=22.8∼65.5MeV for 60Ni, Ein=40,60.8MeV for 62Ni, Ein=40,60.8MeV for 64Ni. Purpose: Our aim is to determine matter radii rm(exp) for 60,62,64Ni from the σR(exp). Method: Our method is the Kyushu g-matrix folding model with the densities scaled from D1S-GHFB ＋ AMP densities, Results: Our skin values are rskin(exp)=0.076±0.019,0.106±0.192,0.162±0.176 fm, and rm(exp)=3.759±0.011,3.811±0.107,3.864±0.101 fm for 60,62,64Ni, respectively.

DOI： 10.1016/j.rinp.2023.106748

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記述言語：その他   掲載種別：研究論文（学術雑誌）  

Background: In our previous work, we determined matter radii 𝑟m(exp) and neutron-skin thickness 𝑟skin(exp) from reaction cross sections 𝜎R (exp) of proton scattering on 208 Pb, 58 Ni, 40,48 Ca, 12 C targets, using the chiral (Kyushu) 𝑔-matrix folding model with the densities calculated with Gogny-D1S-HFB (D1S-GHFB) with angular momentum projection (AMP). The resultant 𝑟skin(exp) agree with the PREX2 and CREX values. As for 58Ni, our value is consistent with one determined from the differential cross section for 58Ni+4He scattering. As for p+60,62,64N scattering, 𝜎R(exp) are available as a function of incident energies 𝐸in, where 𝐸in = 22.8∼65.5 MeV for 60Ni, 𝐸in = 40, 60.8 MeV for 62Ni, 𝐸in = 40, 60.8 MeV for 64Ni.
Purpose Our aim is to determine matter radii 𝑟m(exp) for 60,62,64Ni from the 𝜎R(exp).
Method: Our method is the Kyushu 𝑔-matrix folding model with the densities scaled from D1S-GHFB + AMP densities,
Results: Our skin values are 𝑟skin(exp) = 0.076 ± 0.019, 0.106 ± 0.192, 0.162 ± 0.176 fm, and 𝑟m(exp) = 3.759 ± 0.011, 3.811 ± 0.107, 3.864 ± 0.101 fm for 60,62,64 Ni, respectively.

DOI： https://doi.org/10.1016/j.rinp.2023.106748

記述言語：その他   掲載種別：研究論文（学術雑誌）  

Background: The PREX group reported a new skin value, 𝑟208 (PREX2) = 0.283 ± 0.071 = 0.212 ∼ 0.354 f m.
skin
Horowitz, Pollock and Souder proposed a direct measurement for neutron skin thickness 𝑟skin = 𝑟n −𝑟p [1], where 𝑟p and 𝑟n are proton and neutron radii, respectively. This direct measurement consists of parity- violating and elastic electron scattering. In fact, the PREX collaboration has reported,
208
𝑟skin(PREX2)=0.283±0.071=0.212∼0.354fm, (1)
combining the original Lead Radius EXperiment (PREX) result [2,3]
with the updated PREX2 result [4]. This measurement is a direct one
yielding a neutron skin thickness 𝑟208 . The 𝑟208 (PREX2) is determined skin skin
with weak electromagnetic interaction.
Many theoretical predictions on the symmetry energy 𝑆sym(𝜌) have
been made so far. In neutron star, the 𝑆sym(𝜌) and its density (𝜌) de- pendence influence strongly the nature within the star. The symmetry energy 𝑆sym(𝜌) cannot be measured by experiment directly. In place of
∗ Corresponding author.
E-mail address: orion093g@gmail.com (M. Yahiro).
https://doi.org/10.1016/j.rinp.2023.106649
from 𝑟208 (PREX2). As shown later in Eq. (3), we also determine the skin
relation yielding 𝐿 = 76 ∼ 165 MeV.
Meanwhile, reaction cross section 𝜎R is a standard observable for
determining matter radius 𝑟m and skin value 𝑟skin. High-accuracy data
𝜎R(exp) with 2% error are available for p + 208Pb scattering in 21 ≤
𝐸lab ≤ 100 MeV [6–8]. The chiral (Kyushu) 𝑔-matrix folding model
with the D1S-GHFB+AMP yields 𝑟208 (exp) = 0.278 ± 0.035 fm [9], skin
Using the chiral (Kyushu) 𝑔-matrix folding model with the proton and neutron densities determined with D1S+GHFB+AMP, we determined neutron skin thickness 𝑟208 (exp) = 0.278 ± 0.035 fm from reaction cross sec-
208 skin
Pb scattering, where D1S-GHFB+AMP denotes Gogny-D1S HFB with angular momentum
tions 𝜎R(exp) of p+
projection (AMP). The method also yielded 𝑟208 (exp) = 0.416 ± 0.146 from 𝜎 (exp) of 4 He+208 Pb scattering. In
skin R
our previous work, we accumulated the 206 EoSs and determined a sloop parameter 𝐿 = 76 ∼ 165 MeV from
the 206 EoSs. The value of 𝐿 yields 𝑟208 = 0.102 ∼ 0.354 fm. As for 58Ni, a novel method for measuring nuclear skin
reactions in inverse kinematics with stored ion beams was successfully used to extract matter radii 𝑟m of 58Ni
at the GSI facility.
Purpose: As the first aim, we first determine 𝑟208 (exp) from 𝜎 (exp) of 3He scattering on 208Pb target and skin R
take the weighted mean and its error for 𝑟208 (PREX2), three skin values of p+208Pb, 3,4He+208Pb scattering skin
and 𝑟208 = 0.102 ∼ 0.354 fm based on the 206 EoSs. As the second aim, we determine matter radii 𝑟 (exp) of skin 𝑚
58,60,64Ni from 𝜎R(exp) of 3,4He scattering on 58,60,64Ni targets.
Results: Our result is 𝑟208 (exp) = 0.512±0.268 fm for 3He+208Pb scattering. Our results based on 4He+58,60,64Ni
skin
scattering are 𝑟58(exp) = 3.734±0.091 fm, 𝑟60(exp) = 3.815±0.094 fm, 𝑟64(exp) = 4.001±0.093 fm. Our results based mmm
on 3He+58,60,64Ni scattering are 𝑟58(exp) = 3.709±0.098 fm, 𝑟60(exp) = 3.753±0.112 fm, 𝑟64(exp) = 3.822±0.142 fm. mmm
Conclusion: Our conclusion is 𝑟208 = 0.285 ± 0.030 fm. It is determined from the 5 skin values mentioned skin
above.

DOI： https://doi.org/10.1016/j.rinp.2023.106649

記述言語：その他   掲載種別：研究論文（学術雑誌）  

Background: In our previous paper, we tested the chiral (Kyushu) folding model for 12C+12C scattering, since the profile function in the Glauber mode is constructed for the system. We found that the folding model is reliable for reaction cross sections 𝜎R in 30 ≲ 𝐸lab ≲ 100 MeV and 250 ≲ 𝐸lab ≲ 400 MeV. Accurate data are available for 12C scattering on 9Be, 12C, 27Al targets in 30 ≲ 𝐸lab ≲ 400 MeV.
Purpose: We determine matter radius 𝑟𝑚(exp) of 12C from the accurate 𝜎R(exp), using the Kyushu 𝑔-matrix
folding model.
Results: Our result is 𝑟12(exp) = 2.352±0.013 fm for 12C. The model is applied for the accurate data on 12C+27 m
Al scattering, and yields 𝑟m (exp) = 2.936 ± 0.012 fm for 27 Al.
Conclusion: Our conclusion is that 𝑟m (exp) = 2.352 ± 0.013 fm agrees with 𝑟m (exp) = 2.35 ± 0.02 fm determined from interaction cross sections by Tanihata et al.

DOI： https://doi.org/10.1016/j.rinp.2023.106675

記述言語：英語  

DOI： 10.1007/s10147-023-02326-w

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記述言語：日本語   出版者・発行元：一般社団法人 日本加速器学会  

DOI： 10.50868/pasj.20.1_57

CiNii Research

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Results in Physics  

The proton radii of D1S-GHFB+AMP agree with those calculated with the isotope shift method based on the electron scattering. We then scale the D1S-GHFB+AMP neutron densities so as to reproduce the . In , we determine from measured . The values are fm for 116Sn, fm for 118Sn, fm for 120Sn, fm for 124Sn. As for 122Sn, the skin value in is fm.

DOI： 10.1016/j.rinp.2023.106296

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Physical Review C  

As for proton scattering, we find that our model is reliable in 20≲Ein≲180 MeV. For 208Pb, the skin value deduced from σR(exp) in 20≲Ein≲180 MeV is r208skin(σR)=0.299±0.020 fm. Our results on rskin are compared with the previous works.

DOI： 10.1103/PhysRevC.107.024608

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Results in Physics  

For the first aim, we use the Love–Franey t-matrix model with the densities scaled from the D1S-GHFB+AMP neutron density, where D1S-GHFB+AMP stands for D1S Gogny HFB (GHFB) with the angular momentum projection (AMP). The D1M-GHFB+AMP is also used to estimate a theoretical error. The resulting skin values are rskin208=0.324±0.047 fm for D1S and rskin208(exp)=0.333±0.047 fm for D1M. The difference Δ=0.109 fm and rm40(exp)=3.361±0.075 fm yield rm48=3.470±0.075 fm, leading to rskin48=0.144±0.075 fm.

DOI： 10.1016/j.rinp.2022.106101

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Results in Physics  

The ΔRskin48(CREX) yields L(CREX)=0∼51MeV and the ΔRskin208(PREX2) does L(PREX2)=76∼165MeV.

DOI： 10.1016/j.rinp.2022.106037

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

We present the measured spin correlation coefficient Cy,y for p−3He elastic scattering at 100 MeV at the angles θc.m.=46.9∘–149.2∘ in the center-of-mass system. The Cy,y data and the existing cross section data are compared with rigorous four-nucleon scattering calculations based on realistic nucleon-nucleon potentials. Large differences are seen in the regime around the cross section minimum for both observables. The Δ-isobar effects estimated by the NN+NΔ coupled-channels approach are small for the cross section. Meanwhile, in Cy,y, the Δ-isobar effects improve the agreement with the data. The analysis of the p−3He elastic scattering amplitudes implies the necessity of three-nucleon forces (3NFs) that enhance the vector components in the amplitudes. The obtained results indicate that the spin correlation coefficient Cy,y expands the knowledge of the nuclear interactions with the Δ isobar or those including 3NFs that are masked in nucleon-deuteron elastic scattering.

DOI： https://doi.org/10.1103/PhysRevC.106.054002

記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Physical Review C  

We present the measured spin correlation coefficient Cy,y for p-He3 elastic scattering at 100 MeV at the angles θc.m.=46.9∘-149.2∘ in the center-of-mass system. The Cy,y data and the existing cross section data are compared with rigorous four-nucleon scattering calculations based on realistic nucleon-nucleon potentials. Large differences are seen in the regime around the cross section minimum for both observables. The Δ-isobar effects estimated by the NN+NΔ coupled-channels approach are small for the cross section. Meanwhile, in Cy,y, the Δ-isobar effects improve the agreement with the data. The analysis of the p-He3 elastic scattering amplitudes implies the necessity of three-nucleon forces (3NFs) that enhance the vector components in the amplitudes. The obtained results indicate that the spin correlation coefficient Cy,y expands the knowledge of the nuclear interactions with the Δ isobar or those including 3NFs that are masked in nucleon-deuteron elastic scattering.

DOI： 10.1103/physrevc.106.054002

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevC.106.054002/fulltext

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Results in Physics  

Background: For 4,6,8He, Tanihata et al. determined matter radii rm(σI)=1.57(4),2.48(3),2.52(3) fm from interaction cross sections σI for 4,6,8He scattering on Be, C Al targets at 790 MeV/nucleon. Lu et al. measured the atomic isotope shifts (AIS) for 4,6,8He and determined proton radii rp(AIS) for 4,6,8He. As for p+4,6,8He scattering, reaction cross sections σR(exp) are available at 700 MeV with high accuracy. Aim: Our aim is to determine matter radii rm and skins rskin for 6,8He from the σR(exp) and the rp(AIS). Method: Our model is the Love–Franey t-matrix folding model, since the model is better than the optical limit of Glauber model. Results: Our results for 6,8He are rm(exp)=2.48(3),2.53(2) fm and rskin=0.78(3), 0.82(2) fm. Conclusion: For 6,8He, our results rm(σR) agree with those of Tanihata et al. For 8He, the distance between 4He and the center of mass of valence four neutrons is 2.367 fm.

DOI： 10.1016/j.rinp.2022.105329

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Results in Physics  

Tanihata et al. (1988) determined matter radii rm(σI) for 4,6,8He from interaction cross sections σI of 4,6,8He+12C scattering at 790 MeV per nucleon, using the optical limit of the Glauber model. Lu et al. (2013) determined proton radii rp(AIS) for 4,6,8He with the atomic isotope shifts (AIS). We investigate whether the Love-Franey t-matrix folding model is good for 4,6,8He+12C scattering at 790 MeV per nucleon.

DOI： 10.1016/j.rinp.2021.105132

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Results in Physics  

Background: In our previous paper, we determined rskin208(exp)=0.278±0.035 fm from measured reaction cross sections σR for p+208Pb scattering, using the Kyushu (chiral) g-matrix folding model with the densities calculated with the Gogny-D1S Hartree–Fock–Bogoliubov (D1S-GHFB) with the angular momentum projection (AMP). The value agrees with that of PREX2. Reaction cross sections σR are available for p+48Ca scattering, whereas interaction cross sections σI(≈σR) are available for 48Ca + 12C scattering. As for 48Ca, the high-resolution E1 polarizability experiment (E1pE) yields rskin48(E1pE)=0.14∼0.20fm. Purpose: We determine rskin48(exp) from the data on σR for p+48Ca scattering and from the data on σI for 48Ca+12C scattering. Methods: We use the Kyushu g-matrix folding model with the densities calculated with the D1M-GHFB+AMP densities. The D1M-GHFB+AMP proton and neutron densities are scaled so as to reproduce the data under the condition that the radius rp of the scaled proton density equals the data rp(exp) determined from the electron scattering. We deduce skin values rskin=rn(exp)−rp(exp) from the resulting rn(exp) and the rp(exp) determined from electron scattering. The same procedure is taken for D1S-GHFB+AMP. Results: We regard rskin48(E1pE) as a reference skin value. Using the reference skin value and taking D1M-GHFB+AMP, we determine rskin48(exp)=0.158±0.025 fm for p+48Ca scattering and 0.160±0.058 fm for 48Ca + 12C scattering. Conclusion: We take the weighted mean and its error for the two skin values. The result is rskin48(exp)=0.158±(0.023)exp±(0.012)thfm.

DOI： 10.1016/j.rinp.2021.105155

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記述言語：その他   掲載種別：研究論文（学術雑誌）  

We present a precise measurement of 3He analyzing powers for p-3He elastic scattering with the polarized 3He target at 50, 65, 70, and 100 MeV. The data at 65 and 70 MeV are compared with the theoretical predictions based on the modern nucleon-nucleon potentials. Large discrepancies between the data and the predictions are clearly seen at the angles where the 3He analyzing power takes the minimum and maximum values, which are not explained by Δ-isobar effects.

DOI： 10.1007/s00601-021-01694-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Background: In the previous paper, we predicted reaction cross sections σR for 40−60,62,64Ca+12C scattering at 280 MeV/nucleon, using the chiral g-matrix folding model with the densities calculated with the Gogny-D1S Hartree–Fock–Bogoliubov (GHFB) with and without the angular momentum projection (AMP), since Tanaka et al. measured interaction cross sections σI(≈σR) for 42−51Ca in RIKEN and determined neutron skin rskin(RIKEN) using the optical limit of the Glauber model with the Woods–Saxon densities. Purpose: Our purpose is to reanalyze the rskin from the σI using the chiral g-matrix folding model. Our analysis is superior to theirs, since the chiral g-matrix folding model (the GHFB and GHFB+AMP densities) is much better than the optical limit of the Glauber model (the Woods–Saxon densities). Methods: Our model is the chiral g-matrix folding model with the densities scaled from the GHFB and GHFB+AMP densities. Results: We scale the GHFB and GHFB+AMP densities so that the σR of the scaled densities can agree with the central values of σI under the condition that the proton radius of the scaled proton density equals the data determined from the isotope shift based on the electron scattering. The rskin thus determined are close to their results rskin42−51(RIKEN), except for 48Ca. For 48Ca, our value rskin48 is 0.105 ± 0.06 fm, while their value is rm48(RIKEN)=0.146±0.06 fm. We then take the weighted mean and its error of our result rskin48(σI)=0.105±0.06 fm and the result rskin48(E1pE)=0.17±0.03 fm of the high-resolution E1 polarizability experiment (E1pE). Our final result is rskin48=0.157±0.027 fm. Conclusion: Our conclusion is rskin48=0.157±0.027 fm for 48Ca. For 42−47,49−51Ca, our results on rskin are similar to theirs. Our result for 48Ca is related to CREX.

DOI： 10.1016/j.rinp.2021.104923

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Background: The neutron skin thickness RskinPV of PREX-II is presented in Adhikari et al. (2021). The reaction cross section σR is useful to determine the matter radius Rm and Rskin. For proton scattering, the reaction cross section σR are available for Elab˜>400MeV. Methods and results: We determine Rnexp=5.727±0.071 fm and Rmexp=5.617±0.044 fm from Rpexp = 5.444 fm and RskinPV. The RpGHFB calculated with Gongny-D1S HFB (GHFB) with the angular momentum projection (AMP) agrees with Rpexp. The neutron density calculated with GHFB+AMP is scaled so as to Rnscaling=5.727 fm. The Love-Franey t-matrix model with the scaled densities reproduces the data on σR. Aim: Our aim is to find the σR of proton scattering consistent with RskinPV. Conclusion: The σR of proton scattering consistent with RskinPV are σRexp at Elab=534.1,549,806MeV.

DOI： 10.1016/j.rinp.2021.104749

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Background: The reaction cross section σR is useful to determine the neutron radius Rn as well as the matter radius Rm. The chiral (Kyushu) g-matrix folding model for C12 scattering on Be9, C12, Al27 targets was tested in the incident energy range of 30 Ein 400 MeV, and it is found that the model reliably reproduces the σR in 30 Ein 100 MeV and 250 Ein 400 MeV. Purpose: Our aim is to determine rskin208(EXP) from σR(EXP) for p+Pb208 scattering in 30≤Elab≤100 MeV. Methods: Our model is the Kyushu g-matrix folding model with the densities calculated with Gongny-D1S HFB (GHFB) with the angular momentum projection (AMP). Results: The Kyushu g-matrix folding model with the GHFB+AMP densities underestimates σR in 30≤Ein≤100 MeV only by a factor of 0.97. Since the proton radius Rp calculated with GHFB+AMP agrees with the precise experimental data of 5.444 fm, the small deviation of the theoretical result from the data on σR allows us to scale the GHFB+AMP neutron density so as to reproduce the σR data. In Ein=30-100 MeV, the experimental σR data can be reproduced by assuming the neutron radius of Pb208 as Rn=5.722±0.035 fm. Conclusion: The present result Rskin=0.278±0.035 fm is in good agreement with the recent PREX-II result of rskin=0.283±0.071 fm.

DOI： 10.1103/PhysRevC.104.024606

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.nimb.2019.05.057

記述言語：その他   掲載種別：研究論文（学術雑誌）  

We present a precise measurement of the cross section, proton and He3 analyzing powers, and spin correlation coefficient Cy,y for p-He3 elastic scattering near 65 MeV, and a comparison with rigorous four-nucleon scattering calculations based on realistic nuclear potentials and a model with Δ-isobar excitation. Clear discrepancies are seen in some of the measured observables in the regime around the cross section minimum. Theoretical predictions using scaling relations between the calculated cross section and the He3 binding energy are not successful in reproducing the data. Large sensitivity to the NN potentials and rather small Δ-isobar effects in the calculated cross section are noticed as different features from those in the deuteron-proton elastic scattering. The results obtained above indicate that p-He3 scattering at intermediate energies is an excellent tool to explore nuclear interactions not accessible by three-nucleon scattering.

DOI： 10.1103/physrevc.103.044001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The spin-isospin responses of the 11Li drip-line nucleus has been measured. Preliminary results of the 11Li(p, n)11Be experiment in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center are presented including the observation of 1n, 2n, t, d, 2α and 6He+α decay channels of 11Be reaction product. Details of the experimental setup based on PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition) low-energy neutron detector and the SAMURAI large-acceptance magnetic spectrometer are described.

記述言語：その他   掲載種別：研究論文（その他学術会議資料等）  

The spin-isospin responses of the 11Li drip-line nucleus has been measured. Preliminary results of the 11Li(p, n)11Be experiment in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center are presented including the observation of 1n, 2n, t, d, 2α and 6He+α decay channels of 11Be reaction product. Details of the experimental setup based on PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition) low-energy neutron detector and the SAMURAI large-acceptance magnetic spectrometer are described.

DOI： 10.1088/1742-6596/1643/1/012107

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have measured the differential cross-sections and analyzing powers for (p, 2p) reactions at an incident energy of 392 MeV on C-12, O-16, Ca-40, and Pb-208 nuclei, leading to discrete states of the residual nuclei. The data are compared with two kinds of distorted-wave impulse approximation (DWIA) calculations, a standard calculation using a global optical potential and a calculation using wave functions generated in a relativistic Hartree model. The spectroscopic factors deduced from these two calculations agree with those determined in (e, e' p) studies mostly within 15% in the case of the lighter three target nuclei. However, those for the Pb-208 target are overestimated compared with the (e, e' p) results. In the heavy target case, the DWIA results are very sensitive to the radius parameter of the bound-state potential and thus a careful treatment is required. Regarding the analyzing powers of the present measurement, we confirmed that the j-dependence is sufficient for practical spectroscopic use.

DOI： 10.1093/ptep/ptaa109

記述言語：日本語  

Structure of neutron-rich Al isotopes studied by Beta-decay of spin-polarized Mg

DOI： 10.11316/jpsgaiyo.75.1.0_297

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The structure of a neutron-rich F25 nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A MeV in inverse kinematics. The sum of spectroscopic factors of π0d5/2 orbital is found to be 1.0±0.3. However, the spectroscopic factor with residual O24 nucleus being in the ground state is found to be only 0.36±0.13, while those in the excited state is 0.65±0.25. The result shows that the O24 core of F25 nucleus significantly differs from a free O24 nucleus, and the core consists of ∼35% O24g.s.. and ∼65% excited O24. The result may infer that the addition of the 0d5/2 proton considerably changes neutron structure in F25 from that in O24, which could be a possible mechanism responsible for the oxygen dripline anomaly.

DOI： 10.1103/PhysRevLett.124.212502

記述言語：その他   掲載種別：研究論文（学術雑誌）  

The structure of a neutron-rich F25 nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A MeV in inverse kinematics. The sum of spectroscopic factors of π0d5/2 orbital is found to be 1.0±0.3. However, the spectroscopic factor with residual O24 nucleus being in the ground state is found to be only 0.36±0.13, while those in the excited state is 0.65±0.25. The result shows that the O24 core of F25 nucleus significantly differs from a free O24 nucleus, and the core consists of ∼35% O24g.s.. and ∼65% excited O24. The result may infer that the addition of the 0d5/2 proton considerably changes neutron structure in F25 from that in O24, which could be a possible mechanism responsible for the oxygen dripline anomaly.

DOI： 10.1103/PhysRevLett.124.212502

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The status of a project to measure spin-isospin responses of neutron drip-line nuclei using a new low-energy neutron detector, PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition), is reported. The performance of PANDORA was characterized by the ⁶He(p,n)⁶Li reaction in inverse kinematics at the HIMAC facility in Chiba. Observation of the strong transition to the ground state in ⁶Li is discussed. Preliminary results of ¹¹Li(p,n)¹¹Be and ¹⁴Be(p,n)¹⁴B experiments in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center are also presented including the exotic decay channel of ¹¹Be→9Li + d. Details of the experimental setup based on PANDORA and the SAMURAI large-acceptance magnetic spectrometer, as well as the combined data-acquisition system are described. The neutron-gamma discrimination capability of PANDORA was evaluated, Figure-of-Merit (FoM) values higher than those found in the literature for similar materials were derived from experimental data.

DOI： 10.1016/j.nimb.2019.05.057

記述言語：その他   掲載種別：研究論文（その他学術会議資料等）  

We performed the measurement of the cross section and the proton analyzing power (formula presented) for p–(formula presented)He elastic scattering with a 65 MeV polarized proton beam at Research Center for Nuclear Physics (RCNP), Osaka University. The proton analyzing power (formula presented) data are compared with the theoretical calculations based on the nucleon–nucleon potential (INOY04).

DOI： 10.1007/978-3-030-32357-8_85

記述言語：その他   掲載種別：研究論文（その他学術会議資料等）  

In order to study three-nucleon force (3NF) effects in three-nucleon scattering we performed the measurements of the cross sections and the spin observables for the deuteron–proton (dp) scattering with the polarized deuteron beams at the incident energies up to 135 MeV/nucleon. Recently we have extended the measurements at the RIKEN RI Beam Factory (RIBF) with the polarized deuteron beams at 190, 250, and 300 MeV/nucleon.

DOI： 10.1007/978-3-030-32357-8_84

記述言語：その他   掲載種別：研究論文（学術雑誌）  

The status of a project to measure spin-isospin responses of neutron drip-line nuclei using a new low-energy neutron detector, PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition), is reported. The performance of PANDORA was characterized by the 6He(p,n)6Li reaction in inverse kinematics at the HIMAC facility in Chiba. Observation of the strong transition to the ground state in 6Li is discussed. Preliminary results of 11Li(p,n)11Be and 14Be(p,n)14B experiments in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center are also presented including the exotic decay channel of 11Be→9Li + d. Details of the experimental setup based on PANDORA and the SAMURAI large-acceptance magnetic spectrometer, as well as the combined data-acquisition system are described. The neutron-gamma discrimination capability of PANDORA was evaluated, Figure-of-Merit (FoM) values higher than those found in the literature for similar materials were derived from experimental data.

DOI： 10.1016/j.nimb.2019.05.057

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The status of a project to measure spin-isospin responses of neutron drip-line nuclei using a new low-energy neutron detector, PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition), is reported. The performance of PANDORA was characterized by the 6He(p,n)6Li reaction in inverse kinematics at the HIMAC facility in Chiba. Observation of the strong transition to the ground state in 6Li is discussed. Preliminary results of 11Li(p,n)11Be and 14Be(p,n)14B experiments in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center are also presented including the exotic decay channel of 11Be→9Li + d. Details of the experimental setup based on PANDORA and the SAMURAI large-acceptance magnetic spectrometer, as well as the combined data-acquisition system are described. The neutron-gamma discrimination capability of PANDORA was evaluated, Figure-of-Merit (FoM) values higher than those found in the literature for similar materials were derived from experimental data.

DOI： 10.1016/j.nimb.2019.05.057

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

We performed the measurement of the cross section and the proton analyzing power (formula presented) for p–(formula presented)He elastic scattering with a 65 MeV polarized proton beam at Research Center for Nuclear Physics (RCNP), Osaka University. The proton analyzing power (formula presented) data are compared with the theoretical calculations based on the nucleon–nucleon potential (INOY04).

DOI： 10.1007/978-3-030-32357-8_85

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

In order to study three-nucleon force (3NF) effects in three-nucleon scattering we performed the measurements of the cross sections and the spin observables for the deuteron–proton (dp) scattering with the polarized deuteron beams at the incident energies up to 135 MeV/nucleon. Recently we have extended the measurements at the RIKEN RI Beam Factory (RIBF) with the polarized deuteron beams at 190, 250, and 300 MeV/nucleon.

DOI： 10.1007/978-3-030-32357-8_84

記述言語：その他   掲載種別：研究論文（その他学術会議資料等）  

One of the primary goals of nuclear physics is to describe nuclei and their dynamics in terms of interactions between nuclear constituents. In addition, high-precision experimental data and sophisticated calculations are very important for other research fields such as astrophysics and neutrino physics. Three topics are discussed by comparing experimental data with recent theoretical calculations; three-nucleon force effects in few nucleon systems, polarization phenomena and spin-isospin responses in quest of a comprehensive description of nuclei, and applications to neutrino physics.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A high position resolution neutron detector for time-of-flight measurements is being developed to measure the [Formula presented] reaction in inverse kinematics with an excitation energy resolution of 1 MeV at the RIKEN RI Beam Factory. In this study, a new method based on the segmentation of the neutron detector part is employed to achieve a position resolution on the order of mm with a prototype neutron detector. The prototype detector consists of 8 × 8 scintillating fibers, two multi-anode photomultiplier tubes (PMTs) and two light guides. The scintillating fibers have a cross sectional area of [Formula presented]. The prototype's performance is studied using the neutron and proton beams provided at the Cyclotron and Radioisotope Center (CYRIC), Tohoku University and the Research Center for Nuclear Physics (RCNP), Osaka University. It is confirmed that the hit pattern analysis correctly recognizes the neutron detection position within the fiber size of 3.75 mm. The obtained TOF resolution of 350 ps (FWHM), lateral position resolution of 2.5 mm (FWHM), and longitudinal position resolution of 50–60 mm (FWHM) satisfy the requirements to achieve an excitation energy resolution of 1 MeV. The typical detection efficiency is [Formula presented]2.0% for a neutron with a kinetic energy of 50–200 MeV. The detailed investigation of the detection efficiency in conjunction with the neutron hit position reveals the existence of the non-uniformity of the efficiency. It is shown that the non-uniformity can be mitigated by reducing the threshold level, and by increasing the detector size. For a larger neutron detector, based on the design of the prototype detector, the non-uniformity will thus be negligible.

DOI： 10.1016/j.nima.2018.10.153

記述言語：その他   掲載種別：研究論文（学術雑誌）  

© 2018 A high position resolution neutron detector for time-of-flight measurements is being developed to measure the [Formula presented] reaction in inverse kinematics with an excitation energy resolution of 1 MeV at the RIKEN RI Beam Factory. In this study, a new method based on the segmentation of the neutron detector part is employed to achieve a position resolution on the order of mm with a prototype neutron detector. The prototype detector consists of 8 × 8 scintillating fibers, two multi-anode photomultiplier tubes (PMTs) and two light guides. The scintillating fibers have a cross sectional area of [Formula presented]. The prototype's performance is studied using the neutron and proton beams provided at the Cyclotron and Radioisotope Center (CYRIC), Tohoku University and the Research Center for Nuclear Physics (RCNP), Osaka University. It is confirmed that the hit pattern analysis correctly recognizes the neutron detection position within the fiber size of 3.75 mm. The obtained TOF resolution of 350 ps (FWHM), lateral position resolution of 2.5 mm (FWHM), and longitudinal position resolution of 50–60 mm (FWHM) satisfy the requirements to achieve an excitation energy resolution of 1 MeV. The typical detection efficiency is [Formula presented]2.0% for a neutron with a kinetic energy of 50–200 MeV. The detailed investigation of the detection efficiency in conjunction with the neutron hit position reveals the existence of the non-uniformity of the efficiency. It is shown that the non-uniformity can be mitigated by reducing the threshold level, and by increasing the detector size. For a larger neutron detector, based on the design of the prototype detector, the non-uniformity will thus be negligible.

DOI： 10.1016/j.nima.2018.10.153

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Extraction of the Landau-Migdal Parameter from the Gamow-Teller Giant Resonance in Sn-132
The key parameter to discuss the possibility of the pion condensation in nuclear matter, i.e., the so-called Landau-Migdal parameter g', was extracted by measuring the double-differential cross sections for the (p, n) reaction at 216 MeV/u on a neutron-rich doubly magic unstable nucleus, Sn-132 with the quality comparable to data taken with stable nuclei. The extracted strengths for Gamow-Teller (GT) transitions from Sn-132 leading to Sb-132 exhibit the GT giant resonance (GTR) at the excitation energy of 16.3 +/- 0.4(stat) +/- 0.4(syst) MeV with the width of Gamma = 4.7 +/- 0.8 MeV. The integrated GT strength up to Ex = 25 MeV is S-GT(-) = 53 +/- 5(stat)(-10)(+11)(syst), corresponding to 56&#37; of Ikeda's sum rule of 3(N - Z) = 96. The present result accurately constrains the Landau-Migdal parameter as g' = 0.68 +/- 0.07, thanks to the high sensitivity of the GTR energy to g'. In combination with previous studies on the GTR for Zr-90 and Pb-208, the result of this work shows the constancy of this parameter in the nuclear chart region with (N - Z)/A = 0.11 to 0.24 and A = 90 to 208.

DOI： 10.1103/PhysRevLett.121.132501

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Differential cross sections of p-6He elastic scattering were measured in inverse kinematics at an incident energy of 200 A MeV, covering the high momentum transfer region of 1.7-2.7 -1. The sensitivity of the elastic scattering at low and high momentum transfers to the density distribution was investigated quantitatively using relativistic impulse approximation calculations. In the high momentum transfer region, where the present data were taken, the differential cross section has an order of magnitude higher sensitivity to the inner part of the 6He density relative to the peripheral part (15:1). This feature makes the obtained data valuable for the deduction of the inner part of the 6He density. The data were compared to a set of calculations assuming different proton and neutron density profiles of 6He. The data are well reproduced by the calculation assuming almost the same profiles of proton and neutron densities around the center of 6He, and a proton profile reproducing the known point-proton radius of 1.94 fm. This finding is consistent with the assumption that the 6He nucleus consists of a rigid α-like core with a two-neutron halo.

DOI： 10.1093/ptep/pty048

記述言語：その他   掲載種別：研究論文（学術雑誌）  

Differential cross sections of p-6He elastic scattering were measured in inverse kinematics at an incident energy of 200 A MeV, covering the high momentum transfer region of 1.7-2.7 -1. The sensitivity of the elastic scattering at low and high momentum transfers to the density distribution was investigated quantitatively using relativistic impulse approximation calculations. In the high momentum transfer region, where the present data were taken, the differential cross section has an order of magnitude higher sensitivity to the inner part of the 6He density relative to the peripheral part (15:1). This feature makes the obtained data valuable for the deduction of the inner part of the 6He density. The data were compared to a set of calculations assuming different proton and neutron density profiles of 6He. The data are well reproduced by the calculation assuming almost the same profiles of proton and neutron densities around the center of 6He, and a proton profile reproducing the known point-proton radius of 1.94 fm. This finding is consistent with the assumption that the 6He nucleus consists of a rigid α-like core with a two-neutron halo.

DOI： 10.1093/ptep/pty048

記述言語：その他  

alpha-unbound levels in Ar-34 from Ar-36(p,t)Ar-34 reaction measurements and implications for the astrophysical S-30(alpha, p)Cl-33 reaction rate

DOI： 10.1103/PhysRevC.97.054613

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The S30(α,p)Cl33 reaction has been identified in several type-1 x-ray burst (XRB) sensitivity studies as a significant reaction within the αp process, possibly influencing not only the abundances of burst ashes but also the bolometric shape of double-peaked light curves coming from certain XRB systems. Given the dearth of experimental data on the S30(α,p) Cl33 reaction at burst temperatures, we have performed high energy-resolution forward-angle Ar36(p,t)Ar34 measurements in order to identify levels in Ar34 that could appear as resonances in the S30(α,p)Cl33 reaction. Energies of levels identified in this work, along with model-based assumptions for spin assignments and spectroscopic factors, were then used to determine a rate for the S30(α,p)Cl33 reaction based on a narrow-resonance formalism. The rates determined in this work are then compared with two standard Hauser-Feshbach model predictions over a range of XRB temperatures.

DOI： 10.1103/PhysRevC.97.054613

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The dependence of the single-particle strength on the difference between proton and neutron separation energies is studied for oxygen isotopes in a wide range of isospins. The cross sections of the quasi-free (p, 2p) reaction on ^{14,16,18,22,24}O were measured at intermediate energies. The measured cross sections are compared to predictions based on the distorted wave impulse approximation and shell-model psd valence-space spectroscopic factors. The reduction factors, which are the ratio of the experimental cross sections to the theoretical predictions, show no apparent dependence on the proton–neutron separation energy difference. The result is compatible with the result of the (e, ep) reaction on stable targets and with the predictions of recent ab initio calculations.

DOI： 10.1093/ptep/pty011

記述言語：その他   掲載種別：研究論文（学術雑誌）  

The dependence of the single-particle strength on the difference between proton and neutron separation energies is studied for oxygen isotopes in a wide range of isospins. The cross sections of the quasi-free (p, 2p) reaction on 14,16,18,22,24O were measured at intermediate energies. The measured cross sections are compared to predictions based on the distorted wave impulse approximation and shell-model psd valence-space spectroscopic factors. The reduction factors, which are the ratio of the experimental cross sections to the theoretical predictions, show no apparent dependence on the proton–neutron separation energy difference. The result is compatible with the result of the (e, ep) reaction on stable targets and with the predictions of recent ab initio calculations.

DOI： 10.1093/ptep/pty011

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Complete set of deuteron analyzing powers from (d)over-right-arrowp elastic scattering at 190 MeV/nucleon

DOI： 10.1103/PhysRevC.96.064001

記述言語：その他   掲載種別：研究論文（学術雑誌）  

All deuteron analyzing powers for elastic deuteron-proton (dp) scattering have been measured with a polarized deuteron beam at 186.6 MeV/nucleon. They are compared with results of three-nucleon Faddeev calculations based on the standard, high-precision nucleon-nucleon (NN) potentials alone or combined with commonly used three-nucleon force (3NF) models such as the Tucson-Melbourne '99 or the Urbana IX. Predicted 3NF effects localized at backward angles are supported only partially by the data. The data are also compared to predictions based on locally regularized chiral NN potentials. An estimation of theoretical truncation uncertainties in the consecutive orders of chiral expansion suggests that the observed discrepancies between this modern theory and the data could probably be explained by including chiral 3NF's in future calculations. A systematic comparison to the deuteron analyzing power data previously taken at incident energies from 70 to 294 MeV/nucleon clearly shows that not only the cross section but also the analyzing powers reveal growing 3NF effects when the three-nucleon system energy is increased.

DOI： 10.1103/PhysRevC.96.064001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Proton-induced knockout reactions provide a direct means of studying the single particle or cluster structures of target nuclei. In addition, these knockout reactions are expected to play a unique role in investigations of the effects of the nuclear medium on nucleon–nucleon interactions as well as the properties of nucleons and mesons. However, due to the nature of hadron probes, these reactions can suffer significant disturbances from the nuclear surroundings and the quantitative theoretical treatment of such processes can also be challenging. In this article, we review the experimental and theoretical progress in this field, particularly focusing on the use of these reactions as a spectroscopic tool and as a way to examine the medium modification of nucleon–nucleon interactions. With regard to the former aspect, the review presents a semi-quantitative evaluation of these reactions based on existing experimental data. In terms of the latter point, we introduce a significant body of evidence that suggests, although does not conclusively prove, the existence of medium effects. In addition, this paper also provides information and comments on other related subjects.

DOI： 10.1016/j.ppnp.2017.06.002

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cross sections for (d, n) reactions on
^nat
C-
¹⁹⁷
Au have been measured at a bombarding energy of 55 MeV and a laboratory scattering angle of θ
_lab
= 9.5
^◦
. The angular distributions for the
^nat
C(d, n) reaction have also been obtained at θ
_lab
= 0
^◦
-40
^◦
. The neutron energy spectra are dominated by deuteron breakup contributions and their peak positions can be reasonably reproduced by considering the Coulomb force effects. The data are compared with the TENDL-2015 nuclear data and Particle and Heavy Ion Transport code System (PHITS) calculations. Both calculations fail to reproduce the measured energy spectra and angular distributions.

DOI： 10.1093/ptep/ptx099

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cross sections for (d, n) reactions on C-nat-Au-197 have been measured at a bombarding energy of 55MeV and a laboratory scattering angle of 0(lab) = 9.5 degrees. The angular distributions for the C-nat(d, n) reaction have also been obtained at 0(lab) = 0 degrees-40 degrees. The neutron energy spectra are dominated by deuteron breakup contributions and their peak positions can be reasonably reproduced by considering the Coulomb force effects. The data are compared with the TENDL-2015 nuclear data and Particle and Heavy Ion Transport code System (PHITS) calculations. Both calculations fail to reproduce the measured energy spectra and angular distributions.

DOI： 10.1093/ptep/ptx099

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cross sections for (d,n) reactions on natC–197Au have been measured at a bombarding energy of 55MeV and a laboratory scattering angle of θlab = 9.5◦. The angular distributions for the natC(d, n) reaction have also been obtained at θlab = 0◦–40◦. The neutron energy spectra are dominated by deuteron breakup contributions and their peak positions can be reasonably reproduced by considering the Coulomb force effects. The data are compared with the TENDL- 2015 nuclear data and Particle and Heavy Ion Transport code System (PHITS) calculations. Both calculations fail to reproduce the measured energy spectra and angular distributions.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report measurements of cross sections and analyzing powers for nucleon-knockout ((p) over bar, np) reactions of H-2, Li-6, and C-12 at 296 MeV using the RCNP NPOL3 neutron detector and large acceptance spectrometer. The 1s and 1p knockout reactions were successfully separated with a separation-energy resolution of approximately 6 MeV. The resulting data were compared with plane-wave and distorted-wave impulse approximation calculations employing the nucleon-nucleon t matrix in free space. No significant differences were identified in the case of the present analyzing power data, in contrast to the significant reductions observed in ((p) over bar , 2p) values. The conventional Pauli blocking and nuclear binding effects with the g matrix and the relativistic effect of nucleon mass reduction in the nuclei are also discussed.

DOI： 10.1103/PhysRevC.96.014604

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report measurements of cross sections and analyzing powers for nucleon-knockout (pnp) reactions of H2, Li6, and C12 at 296 MeV using the RCNP NPOL3 neutron detector and large acceptance spectrometer. The 1s and 1p knockout reactions were successfully separated with a separation-energy resolution of approximately 6 MeV. The resulting data were compared with plane-wave and distorted-wave impulse approximation calculations employing the nucleon-nucleon t matrix in free space. No significant differences were identified in the case of the present analyzing power data, in contrast to the significant reductions observed in (p2p) values. The conventional Pauli blocking and nuclear binding effects with the g matrix and the relativistic effect of nucleon mass reduction in the nuclei are also discussed.

DOI： 10.1103/PhysRevC.96.014604

記述言語：英語  

Proton-induced knockout reactions with polarized and unpolarized beams

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have measured a complete set of deuteron analyzing powers in deuteron–proton elastic scattering at 190, 250, and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon–nucleon forces together with the Tucson-Melbourne’99, and UrbanaIX three nucleon forces. The data are also presented with the calculations based on the N4LO NN potentials of the chiral effective field theory.

DOI： 10.1007/s00601-017-1213-6

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report measurements of cross sections and analyzing powers for nucleon-knockout (p⃗,np) reactions of 2H, 6Li, and 12C at 296 MeV using the RCNP NPOL3 neutron detector and large acceptance spectrometer. The 1s and 1p knockout reactions were successfully separated with a separation-energy resolution of approximately 6 MeV. The resulting data were compared with plane-wave and distorted-wave impulse approximation calculations employing the nucleon-nucleon t matrix in free space. No significant differences were identified in the case of the present analyzing power data, in contrast to the significant reductions observed in (p⃗,2p) values. The conventional Pauli blocking and nuclear binding effects with the g matrix and the relativistic effect of nucleon mass reduction in the nuclei are also discussed.

記述言語：英語  

We have measured a complete set of deuteron analyzing powers in deuteron–proton elastic scattering at 190, 250, and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon–nucleon forces together with the Tucson-Melbourne’99, and UrbanaIX three nucleon forces. The data are also presented with the calculations based on the N4LO NN potentials of the chiral effective field theory.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have combined the low-energy neutron detector WINDS (Wide-angle Inverse-kinematics Neutron Detectors for SHARAQ) and the SAMURAI spectrometer at RIKEN Nishina Center RI Beam Factory (RIBF) in order to perform ðp; nÞ reactions in inverse kinematics for unstable nuclei in the mass region around A $ 100. In this setup, WINDS is used for detecting recoil neutrons and the SAMURAI spectrom- eter is used for tagging decay channel of heavy residue. The first experiment by using the setup was performed to study Gamow–Teller transitions from 132Sn in April 2014. The atomic number Z and mass-to-charge ratio A=Q of the beam residues were determined from the measurements of time of flight, magnetic rigidity and energy loss. The obtained A=Q and Z resolutions were rA=Q 1⁄4 0:14% and rZ 1⁄4 0:22, respectively. Furthermore, owing to the large momentum acceptance (50%) of SAMURAI, the beam residues associated with the c, 1n and 2n decay channel were measured in the same magnetic field setting. The kinematic loci of the measured recoil neutron energy and laboratory angle are clearly seen. It shows that the excitation energy up to about 20 MeV can be reconstructed.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have combined the low-energy neutron detector WINDS (Wide-angle Inverse-kinematics Neutron Detectors for SHARAQ) and the SAMURAI spectrometer at RIKEN Nishina Center RI Beam Factory (RIBF) in order to perform (p, n) reactions in inverse kinematics for unstable nuclei in the mass region around A similar to 100. In this setup, WINDS is used for detecting recoil neutrons and the SAMURAI spectrometer is used for tagging decay channel of heavy residue. The first experiment by using the setup was performed to study Gamow-Teller transitions from Sn-132 in April 2014. The atomic number Z and mass-to-charge ratio A/Q of the beam residues were determined from the measurements of time of flight, magnetic rigidity and energy loss. The obtained A/Q and Z resolutions were sigma(A/Q), = 0.14% and sigma(Z) = 0.22, respectively. Furthermore, owing to the large momentum acceptance (50%) of SAMURAI, the beam residues associated with the gamma, 1n and 2n decay channel were measured in the same magnetic field setting. The kinematic loci of the measured recoil neutron energy and laboratory angle are clearly seen. It shows that the excitation energy up to about 20 MeV can be reconstructed. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2016.02.007

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have combined the low-energy neutron detector WINDS (Wide-angle Inverse-kinematics Neutron Detectors for SHARAQ) and the SAMURAI spectrometer at RIKEN Nishina Center RI Beam Factory (RIBF) in order to perform (p,n) reactions in inverse kinematics for unstable nuclei in the mass region around A∼100. In this setup, WINDS is used for detecting recoil neutrons and the SAMURAI spectrometer is used for tagging decay channel of heavy residue. The first experiment by using the setup was performed to study Gamow-Teller transitions from ¹³²Sn in April 2014. The atomic number Z and mass-to-charge ratio A/Q of the beam residues were determined from the measurements of time of flight, magnetic rigidity and energy loss. The obtained A/Q and Z resolutions were _σA/Q=0.14% and _σZ=0.22, respectively. Furthermore, owing to the large momentum acceptance (50%) of SAMURAI, the beam residues associated with the _γ, 1n and 2n decay channel were measured in the same magnetic field setting. The kinematic loci of the measured recoil neutron energy and laboratory angle are clearly seen. It shows that the excitation energy up to about 20 MeV can be reconstructed.

DOI： 10.1016/j.nimb.2016.02.007

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The finite value of an electron electric dipole moment (eEDM) provides the direct evidence for the violation of time reversal symmetry. Fr atoms, whose enhancement factor is 895, trapped by laser cooling and trapping techniques are one of the strongest candidates for measuring the eEDM. We are constructing a beamline for measuring the eEDM using laser- cooled Fr atoms at the Cyclotron and Radioisotope Center. We have developed laser light sources including the frequency stabilization system and a magneto-optical trap system for Fr atoms. As the Fr production requires the cyclotron operation, we also use Rb atoms whose chemical properties are similar to those of the Fr atoms. Thus, the Rb beam is utilized for optimizing the operation parameters of the entire apparatus. We have also developed the laser light sources for Rb atoms and observed the beat signal for frequency stabilization of the source using the frequency offset locking method.

DOI： 10.1088/1742-6596/691/1/012017

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The finite value of an electron electric dipole moment (eEDM) provides the direct evidence for the violation of time reversal symmetry. Fr atoms, whose enhancement factor is 895, trapped by laser cooling and trapping techniques are one of the strongest candidates for measuring the eEDM. We are constructing a beamline for measuring the eEDM using laser- cooled Fr atoms at the Cyclotron and Radioisotope Center. We have developed laser light sources including the frequency stabilization system and a magneto-optical trap system for Fr atoms. As the Fr production requires the cyclotron operation, we also use Rb atoms whose chemical properties are similar to those of the Fr atoms. Thus, the Rb beam is utilized for optimizing the operation parameters of the entire apparatus. We have also developed the laser light sources for Rb atoms and observed the beat signal for frequency stabilization of the source using the frequency offset locking method.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We demonstrate frequency offset locking between two laser sources using a waveguide-type electro-optic modulator (EOM) with 10th-order sidebands for magneto-optical trapping of Fr atoms. The frequency locking error signal was successfully obtained by performing delayed self-homodyne detection of the beat signal between the repumping frequency and the 10th-order sideband component of the trapping light. Sweeping the trapping-light and repumping-light frequencies with keeping its frequency difference of 46 GHz was confirmed over 1 GHz by monitoring the Doppler absorption profile of I-2. This technique enables us to search for a resonance frequency of magneto-optical trapping of Fr. (C) 2016 Optical Society of America

DOI： 10.1364/AO.55.001164

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We demonstrate frequency offset locking between two laser sources using a waveguide-type electro-optic modulator (EOM) with 10th-order sidebands for magneto-optical trapping of Fr atoms. The frequency locking error signal was successfully obtained by performing delayed self-homodyne detection of the beat signal between the repumping frequency and the 10th-order sideband component of the trapping light. Sweeping the trappinglight and repumping-light frequencies with keeping its frequency difference of 46 GHz was confirmed over 1 GHz by monitoring the Doppler absorption profile of I 2. This technique enables us to search for a resonance frequency of magneto-optical trapping of Fr.

DOI： 10.1364/AO.55.001164

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A complete set of deuteron analyzing powers for elastic deuteron-proton(dp) scattering at 250 and 294 MeV/nucleon has been measured. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with three- nucleon forces.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The charge-exchange (p, n) reaction at 220 MeV has been measured to extract the strength distribution of Gamow-Teller transitions from the doubly magic unstable nucleus ¹³²Sn. A recently developed experimental technique of measuring the (p, n) reaction in inverse kinematics has been applied to the study of unstable nuclei in the mass region around A ∼ 100 for the first time. We have combined the low-energy neutron detector WINDS and the SAMURAI spectrometer at the RIKEN radioactive isotope beam factory (RIBF). The particle identification plot for the reaction residues obtained by the spectrometer provides the clear separation of the CE reaction channel from other background events, enabling us to identify kinematic curves corresponding the (p, n) reaction. Further analysis to reconstruct the excitation energy spectrum is ongoing.

DOI： 10.1051/epjconf/201610706003

記述言語：その他   掲載種別：研究論文（その他学術会議資料等）  

© 2016 Owned by the authors, published by EDP Sciences. The charge-exchange (p, n) reaction at 220 MeV has been measured to extract the strength distribution of Gamow-Teller transitions from the doubly magic unstable nucleus 132Sn. A recently developed experimental technique of measuring the (p, n) reaction in inverse kinematics has been applied to the study of unstable nuclei in the mass region around A ∼ 100 for the first time. We have combined the low-energy neutron detector WINDS and the SAMURAI spectrometer at the RIKEN radioactive isotope beam factory (RIBF). The particle identification plot for the reaction residues obtained by the spectrometer provides the clear separation of the CE reaction channel from other background events, enabling us to identify kinematic curves corresponding the (p, n) reaction. Further analysis to reconstruct the excitation energy spectrum is ongoing.

DOI： 10.1051/epjconf/201610706003

記述言語：英語  

The goal of this study is to determine the spin-orbit splitting of 1p proton orbits in oxygen isotopes. An experiment for the exclusive measurement of the (⃗p, 2p) reaction was carried out at the SHARAQ beamline at RI Beam Factory, RIKEN. Beam containing oxygen unstable isotopes with the kinetic energy of around 250 MeV bombarded a polarized solid proton target. Proton separation energy was calculated from the momentum vectors of two scattered protons. For 14O(⃗p, 2p), the transition strengths of the 14O(⃗p, 2p)13N reaction leading to the ground state and excited states were separated by the particle identification of the residual nucleus. As a result, 6.3 MeV of 1p spin-orbit splitting of 14O was obtained.

記述言語：英語  

記述言語：英語  

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

A laser cooled heavy atom is one of the candidates to search for the permanent electric dipole moment (EDM) of the electron due to the enhancement mechanism and its long coherence time. The laser cooled francium (Fr) factory has been constructed to perform the electron EDM search at the Cyclotron and Radioisotope Center, Tohoku University. The present status of Fr production and the EDM measurement system is presented.

DOI： 10.1007/s10751-014-1100-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

With the aim of clarifying roles of the 3NFs in nuclei experimental programs with the polarized deuteron beam at intermediate energies are in progress at RIKEN RI Beam Factory. As the first step, we have measured a complete set of deuteron analyzing powers in deuteron-proton elastic scattering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne'99, and UrbanaIX three nucleon forces.

DOI： 10.1007/s00601-014-0867-6

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The effects of three nucleon force (3NF) have been actively studied via the nucleon-deuteron (Nd) scattering states. The differential cross sections and the vector analyzing powers A (y) of the H-2(p, n) inclusive breakup reaction at 170 MeV were measured for the study of 3NF effects in the intermediate energy region. The polarized proton beam of 170 MeV was injected to the deuterated polyethylene (CD2) target and the energy of scattered neutrons were measured by using TOF method. The data were compared with the Faddeev calculations based on modern nucleon-nucleon (NN) forces with and without the 3NF. Concerning the differential cross sections, we can see large discrepancies between the data and the calculations in the region of scattered neutron energies are low, which is similar to the results of the H-2(p, p) inclusive breakup reaction at 250 MeV.

DOI： 10.1007/s00601-014-0868-5

記述言語：英語   掲載種別：研究論文（学術雑誌）  

With the aim of clarifying roles of the 3NFs in nuclei experimental programs with the polarized deuteron beam at intermediate energies are in progress at RIKEN RI Beam Factory. As the first step, we have measured a complete set of deuteron analyzing powers in deuteron-proton elastic scattering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne'99, and UrbanaIX three nucleon forces.

DOI： 10.1007/s00601-014-0867-6

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The effects of three nucleon force (3NF) have been actively studied via the nucleon-deuteron (Nd) scattering states. The differential cross sections and the vector analyzing powers A_y of the ²H(p, n) inclusive breakup reaction at 170 MeV were measured for the study of 3NF effects in the intermediate energy region. The polarized proton beam of 170 MeV was injected to the deuterated polyethylene (CD₂) target and the energy of scattered neutrons were measured by using TOF method. The data were compared with the Faddeev calculations based on modern nucleon-nucleon (NN) forces with and without the 3NF. Concerning the differential cross sections, we can see large discrepancies between the data and the calculations in the region of scattered neutron energies are low, which is similar to the results of the ²H(p, p) inclusive breakup reaction at 250 MeV.

DOI： 10.1007/s00601-014-0868-5

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A complete high-precision set of deuteron analyzing powers for elastic deuteron-proton (dp) scattering at 250 and 294 MeV/nucleon has been measured. These data and previously existing data sets for the cross section at similar energies are compared to the results of three-nucleon Faddeev calculations based on modern nucleon-nucleon (NN) potentials alone or combined with two models of three-nucleon forces: the Tucson-Melbourne 99 and Urbana IX. Large discrepancies between pure NN theory and data, which are not resolved by the current three-nucleon forces, were found at c.m. backward angles θc.m.120 for all the deuteron analyzing powers and the cross section. Because only small relativistic effects were found for the deuteron analyzing powers and the cross section, the inclusion of short-range components of the three-nucleon force is probably required to get a better description of the data.

DOI： 10.1103/PhysRevC.89.064007

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A complete high-precision set of deuteron analyzing powers for elastic deuteron-proton (dp) scattering at 250 and 294 MeV/nucleon has been measured. These data and previously existing data sets for the cross section at similar energies are compared to the results of three-nucleon Faddeev calculations based on modern nucleon-nucleon (NN) potentials alone or combined with two models of three-nucleon forces: the Tucson-Melbourne 99 and Urbana IX. Large discrepancies between pure NN theory and data, which are not resolved by the current three-nucleon forces, were found at c.m. backward angles theta(c.m.) greater than or similar to 120 degrees for all the deuteron analyzing powers and the cross section. Because only small relativistic effects were found for the deuteron analyzing powers and the cross section, the inclusion of short-range components of the three-nucleon force is probably required to get a better description of the data.

DOI： 10.1103/PhysRevC.89.064007

記述言語：英語  

記述言語：その他  

The search for the electric-dipole moment (EDM) of laser-cooled francium (Fr) atoms could lead to a measurement for the electron EDM. It is predicted that the electron EDM would be enhanced by approximately three orders of magnitude in heavy atoms such as Fr. Laser-cooling and trapping techniques are expected to suppress statistical and systematic errors in precision measurements. The magneto-optical trap was achieved using stable rubidium in a developing factory of laser-cooled radioactive atoms. In light of the results from the rubidium experiments, we found that an upgrade of each apparatus is preferred for Fr trapping. © Owned by the authors, published by EDP Sciences, 2014.

DOI： 10.1051/epjconf/20146605009

記述言語：その他  

We plan to measure the permanent electric dipole moment (EDM) of the electron, which has the sensitivity to the CP violation in theories beyond the standard model by using the laser-cooled francium (Fr) atom. This paper reports the present status of the EDM measurement system. A high voltage application system was constructed in order to produce the strong electric field (100 kV/cm) needed for the experiment. After conditioning, the leakage current was 10 pA when a high voltage of 43 kV was applied. Also, a drift of an environmental field was measured at the planned location of the Fr-EDM experiment. The drift is suppressed at present down to the level of 10 pT by installing a 4-layermagnetic shield. Improvements are still needed to reach the required field stability of 1 fT. © Owned by the authors, published by EDP Sciences, 2014.

DOI： 10.1051/epjconf/20146605008

記述言語：その他  

For the measurement of the electron electric dipole moment using Fr atoms, a Fr ion-atom conversion is one of the most critical process. An ion-atom converter based on the "orthotropic" type of Fr source has been developed. This converter is able to convert a few keV Fr ion beam to a thermal atomic beam using a cycle of the surface ionization and neutralization. In this article, the development of the converter is reported. © Owned by the authors, published by EDP Sciences, 2014.

DOI： 10.1051/epjconf/20146605019

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Experimental programs with polarized deuterons beams at intermediate energies are in progress at RIKEN RI Beam Factory. We have measured a complete set of deuteron analyzing powers in deuteron-proton elastic scattering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne'99, and UrbanaIX three nucleon forces.

DOI： 10.1051/epjconf/20146603076

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Complete Set of Deuteron Analyzing Powers for dp Elastic Scattering at Intermediate Energies and Three Nucleon Forces

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Complete set of deuteron analyzing powers for dp elastic scattering at 250-294 MeV/nucleon and the three-nucleon force

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Measurement of the 2H(p, n) Breakup Reaction at 170 MeV and the Three-Nucleon Force Effects

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Experimental programs with polarized deuterons beams at intermediate energies are in progress at RIKEN RI Beam Factory. We have measured a complete set of deuteron analyzing powers in deuteron–proton elastic scattering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon–nucleon forces together with the Tucson-Melbourne’99, and UrbanaIX three nucleon forces.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Gamow-Teller (GT) transitions in atomic nuclei are sensitive to both nuclear shell structure and effective residual interactions. The nuclear GT excitations were studied for the mass number A = 42, 46, 50, and 54 "f-shell" nuclei in (He-3, t) charge-exchange reactions. In the Ca-42 -> Sc-42 reaction, most of the GT strength is concentrated in the lowest excited state at 0.6 MeV, suggesting the existence of a low-energy GT phonon excitation. As A increases, a high-energy GT phonon excitation develops in the 6-11 MeV region. In the Fe-54 -> Co-54 reaction, the high-energy GT phonon excitation mainly carries the GT strength. The existence of these two GT phonon excitations are attributed to the 2 fermionic degrees of freedom in nuclei.

DOI： 10.1103/PhysRevLett.112.112502

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Gamow-Teller (GT) transitions in atomic nuclei are sensitive to both nuclear shell structure and effective residual interactions. The nuclear GT excitations were studied for the mass number A=42, 46, 50, and 54 "f-shell" nuclei in (He3, t) charge-exchange reactions. In the Ca42→Sc42 reaction, most of the GT strength is concentrated in the lowest excited state at 0.6 MeV, suggesting the existence of a low-energy GT phonon excitation. As A increases, a high-energy GT phonon excitation develops in the 6-11 MeV region. In the Fe54→Co54 reaction, the high-energy GT phonon excitation mainly carries the GT strength. The existence of these two GT phonon excitations are attributed to the 2 fermionic degrees of freedom in nuclei.

DOI： 10.1103/PhysRevLett.112.112502

記述言語：英語   掲載種別：研究論文（学術雑誌）  

For the measurement of the electron electric dipole moment using Fr atoms, a Fr ion-atom conversion is one of the most critical process. An ion-atom converter based on the “orthotropic” type of Fr source has been developed. This converter is able to convert a few keV Fr ion beam to a thermal atomic beam using a cycle of the surface ionization and neutralization. In this article, the development of the converter is reported.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The search for the electric-dipole moment (EDM) of laser-cooled francium (Fr) atoms could lead to a measurement for the electron EDM. It is predicted that the electron EDM would be enhanced by approximately three orders of magnitude in heavy atoms such as Fr. Laser-cooling and trapping techniques are expected to suppress statistical and systematic errors in precision measurements. The magneto-optical trap was achieved using stable rubidium in a developing factory of laser-cooled radioactive atoms. In light of the results from the rubidium experiments, we found that an upgrade of each apparatus is preferred for Fr trapping.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The search for the violation of the fundamental symmetry in a radioactive atom is the promising candidate for precision tests of the standard model and its possible extensions. The subtle signal arising from the symmetry violation is enhanced in heavy atoms, such as a francium (Fr). To realize high precision measurements, a large amount of radioactive isotopes is required. The Fr is produced via a nuclear fusion reaction using a melted gold target with a O-18 primary beam at Cyclotron and Radioisotope Center, Tohoku University. The maximum extraction efficiency of the Fr ion was achieved at approximately 35&#37;. The beam line consists of an electrostatic deflector, three electrostatic quadrupole triplets to the measurement area at 10 m away from the reaction point, and several beam diagnosis systems. We optimized parameters of the beam line. (C) 2014 AIP Publishing LLC.

DOI： 10.1063/1.4852218

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The search for the violation of the fundamental symmetry in a radioactive atom is the promising candidate for precision tests of the standard model and its possible extensions. The subtle signal arising from the symmetry violation is enhanced in heavy atoms, such as a francium (Fr). To realize high precision measurements, a large amount of radioactive isotopes is required. The Fr is produced via a nuclear fusion reaction using a melted gold target with a ¹⁸O primary beam at Cyclotron and Radioisotope Center, Tohoku University. The maximum extraction efficiency of the Fr ion was achieved at approximately 35%. The beam line consists of an electrostatic deflector, three electrostatic quadrupole triplets to the measurement area at 10 m away from the reaction point, and several beam diagnosis systems. We optimized parameters of the beam line.

DOI： 10.1063/1.4852218

記述言語：英語   掲載種別：研究論文（学術雑誌）  

With the aim of clarifying roles of the 3NFs in nuclei experimental programs with polarized deu&#56319;&#56320; terons beams at intermediate energies are in progress at RIKEN RI Beam Factory. As the first step, we have measured a complete set of deuteron analyzing powers (iT11, T20, T21, T22) in deuteron–proton elastic scat&#56319;&#56320; tering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon–nucleon forces together with the Tucson&#56319;&#56320;Melbourne'99, and UrbanaIX three nucleon forces.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Laser cooled francium factory for the electron electric dipole moment search

記述言語：英語   掲載種別：研究論文（学術雑誌）  

With the aim of clarifying roles of the 3NFs in nuclei experimental programs with polarized deuterons beams at intermediate energies are in progress at RIKEN RI Beam Factory. As the first step, we have measured a complete set of deuteron analyzing powers (iT (11), T (20), T (21), T (22)) in deuteron-proton elastic scattering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne'99, and UrbanaIX three nucleon forces.

DOI： 10.1134/S1063779614010894

記述言語：英語   掲載種別：研究論文（学術雑誌）  

With the aim of clarifying roles of the 3NFs in nuclei experimental programs with polarized deuterons beams at intermediate energies are in progress at RIKEN RI Beam Factory. As the first step, we have measured a complete set of deuteron analyzing powers (iT₁₁, T₂₀, T₂₁, T₂₂) in deuteron-proton elastic scattering at 250 and 294 MeV/nucleon. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne'99, and UrbanaIX three nucleon forces.

DOI： 10.1134/S1063779614010894

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A factory of laser-cooled francium (Fr) atoms is being developed to search for the electric dipole moment (EDM) of the electron. The factory has achieved the production of Fr ions of 9 x 10(5) particles/s and transport with a transmission efficiency of 2&#37;. In pilot experiments, the magneto-optical trapping of rubidium (Rb) has been performed using a new ion-to-atom converter. To achieve the Fr trap, the development and design of each of the factory's components are in progress. (C) 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2013.07.038

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1103/PhysRevC.88.059902

記述言語：その他  

Level structure of S-30 and its importance in the Si-26(alpha, p)P-29 and P-29(p, gamma)S-30 reaction rates (vol 86, 065805, 2012)

DOI： 10.1103/PhysRevC.88.059902

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have measured all deuteron analyzing powers A_y^d, A_yy, A_xx, A_xz for deuteron-proton elastic scattering at 294 MeV/nucleon in order to study the properties of three nucleon forces (3 NFs). Measurement was made at in an angular range of θ_c.m. = 35.6°-163.0°. Obtained data were compared with Faddeev calculations with and without the 3 NFs. At θ_c.m. ≲ 120° all the data have general agreement with the calculations, while the measured data at θ_c.m. ≳ 120° are not explained by any theoretical calculations. These results were consistent with those at 250 MeV/nucleon.

DOI： 10.1007/s00601-013-0606-4

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Measurement of all deuteron analyzing powers for $dp$ elastic scattering at 294 MeV/nucleon

DOI： 10.1007/s00601-013-0606-4

記述言語：英語   掲載種別：研究論文（学術雑誌）  

For the study of three nucleon force (3NF) effects in the intermediate energy region, the differential cross sections and the vector analyzing power Ay were measured for the 2H(p, n) inclusive breakup reaction at 170 MeV. The polarized proton beam of 170 MeV was injected to the deuterated polyethylene (CD2) target and the energy of scattered neutrons were deduce by TOF method. The data was compared with the results of the Faddeev calculations with and without 3NFs. Concerning about the differential cross sections, we can see large discrepancies between the data and the calculations in the region where the energies of scattered neutrons are low, which are similar to the results of the 2H(p, p) inclusive breakup reaction at 250 MeV. © 2013 Springer-Verlag Wien.

DOI： 10.1007/s00601-012-0587-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The anti-analog giant dipole resonance (AGDR) was separated from other excitations such as the spin-dipole resonance by multipole decomposition analysis of the 208Pb(→p,→n) reaction at a bombarding energy of Tp = 296MeV. The polarization transfer observables were found to be useful for carrying out this separation. The energy difference between the AGDR and the isobaric analog state (IAS)was determined to beΔE = 8.69 ± 0.36MeV,where the uncertainty includes both statistical and systematic contributions. Theoretical calculations using the proton-neutron relativistic quasi-particle random phase approximation predicted a strong correlation between ΔE and the neutron skin thickness ΔRpn. Under the assumption that the correlation predicted in this model is correct, the present ΔE value corresponds to a neutron skin thickness of ΔRpn = 0.216 ± 0.046 ± 0.015 fm, where the first and second uncertainties are the experimental and theoretical uncertainties, respectively.

DOI： 10.1093/ptep/ptt038

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Extraction of anti-analog giant dipole resonance and neutron skin thickness for Pb-208
The anti-analog giant dipole resonance (AGDR) was separated from other excitations such as the spin-dipole resonance by multipole decomposition analysis of the Pb-208((p) over right arrow, (n) over right arrow) reaction at a bombarding energy of T-p = 296 MeV. The polarization transfer observables were found to be useful for carrying out this separation. The energy difference between the AGDR and the isobaric analog state (IAS) was determined to be Delta E = 8.69 +/- 0.36 MeV, where the uncertainty includes both statistical and systematic contributions. Theoretical calculations using the proton-neutron relativistic quasi-particle random phase approximation predicted a strong correlation between Delta E and the neutron skin thickness Delta R-pn. Under the assumption that the correlation predicted in this model is correct, the present Delta E value corresponds to a neutron skin thickness of Delta R-pn = 0.216 +/- 0.046 +/- 0.015 fm, where the first and second uncertainties are the experimental and theoretical uncertainties, respectively.

DOI： 10.1093/ptep/ptt038

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

The permanent electric dipole moment (EDM) of the elementary particle has the sensitivity to the CP violation in the theories beyond the standard model (SM). The search for the EDM constitutes the stringent test to discriminate between the SM and beyond it. We plan to perform the electron EDM search by using the laser cooled francium (Fr) atom which has the largest enhancement factor of the electron EDM in the alkali atoms. In this paper, the present status of the laser cooled Fr factory that is being constructed at Cyclotron and Radioisotope Center (CYRIC), Tohoku University are reported.

DOI： 10.1063/1.4806789

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

We report measurements of cross sections and analyzing powers for reaction angles of θ_lab = 0.0°-10.0° and complete sets of polarization transfer observables and induced polarizations at θ_lab = 0.0°-7.0° for the ²⁰⁸Pb(p,n) reaction at a bombarding energy of T_p = 296 MeV. A multipole decomposition technique was applied to the data to extract the spin-dipole (SD) components from the continuum. The polarization observables were also used, for the first time, to separate the SD components into different spin-parity transfer (ΔJ^π = 0^-, 1^-, and 2^-) contributions. The SD strength distributions were clearly dependent on ΔJ^π, which is reasonably reproduced by Hartree-Fock (HF) plus random phase approximation (RPA) calculations that include the Skyrme interaction with tensor components [C. L. Bai et al., Phys. Rev. C 83, 054316 (2011)].

DOI： 10.1063/1.4801675

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross sections of pd breakup reaction at E (p) = 250 MeV were measured systematically in single-proton detection and in two-proton coincidence detection. Measured cross section is up to two times higher than calculated ones. The enhancement of breakup cross section is similar to reported enhancement in pd elastic scattering cross section. Origins of this enhancement are discussed.

DOI： 10.1007/s00601-012-0432-0

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The existence of a non-zero electric dipole moment (EDM) implies the violation of time reversal symmetry. As the time-reversal symmetry violation predicted by the Standard Model (SM) for the electron EDM is too small to be observed with current experimental techniques and any a non-zero EDM would indicate new physics beyond the SM. The tiny signal from the electron EDM is enhanced in the heavy atoms such as francium (Fr). We are constructing the laser-cooled Fr factory to search for the electron EDM.

DOI： 10.1007/s10751-013-0788-7

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross sections of pd breakup reaction at E_p = 250 MeV were measured systematically in single-proton detection and in two-proton coincidence detection. Measured cross section is up to two times higher than calculated ones. The enhancement of breakup cross section is similar to reported enhancement in pd elastic scattering cross section. Origins of this enhancement are discussed.

DOI： 10.1007/s00601-012-0432-0

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The effects of three-nucleon force (3NF) has been actively studied by using the nucleon-deuteron (Nd) scattering states. The differential cross sections of the elastic Nd scattering at the energy below 150 MeV can be well reproduced by incorporating 3NF in the Faddeev calculation based on modern nucleon-nucleon (NN) interactions. On the other hand, the differential cross sections of Nd elastic and inelastic scatterings at 250 MeV show large discrepancies between the data and the Faddeev calculations with 3NF. It indicates the presence of the missing features of the three nucleon system at this energy region. For the systematic study about the energy dependence of this large discrepancies, we measured the differential cross sections and the vector analyzing power A_y for the ²H(p, n) inclusive breakup reaction at 170 MeV. The experiment was carried out at RCNP by detecting scattered neutrons by using the neutron detector NPOL3. The data was compared with the results of the Faddeev calculations with and without the 3NF.

DOI： 10.1007/s00601-012-0378-2

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The level structure of 30S was studied via the 28Si(3He,n) and 32S(p,t) reactions at the Nuclear Science Laboratory of the University of Notre Dame and the Research Center for Nuclear Physics of the University of Osaka, Japan. Important experimental information on the energy levels, decay branching ratios, and tentative spin assignments is extracted to calculate the reaction rates for 29P(p,γ)30S and 26Si(α,p)29P, which play a critical role in the reaction flow in explosive hydrogen burning.

DOI： 10.1103/PhysRevC.86.065805

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.1103/physrevc.86.065805

記述言語：その他  

Level structure of S-30 and its importance in the Si-26(alpha,p)P-29 and P-29(p,gamma)S-30 reaction rates

DOI： 10.1103/PhysRevC.86.065805

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The double-differential cross sections for the 116Cd(p,n) and 116Sn(n,p) reactions were measured at 300 MeV for studying the nuclear matrix element of the 116Cd ββ decay. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) component. The integrated GT strengths up to an excitation energy of 30 MeV in the intermediate nucleus 116In are 40 ± 6 and 11 ± 1 in the (p,n) and (n,p) spectra, respectively, including the component from the isovector spin monopole (IVSM). The spectra are compared with those obtained from a theoretical calculation with a quasiparticle random phase approximation, where the contribution from the IVSM component as well as the interference effect between the GT and IVSM components are fully taken into account.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The double-differential cross sections for the 116Cd(p,n) and 116Sn(n,p) reactions were measured at 300 MeV for studying the nuclear matrix element of the 116Cd ββ decay. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) component. The integrated GT strengths up to an excitation energy of 30 MeV in the intermediate nucleus 116In are 40±6 and 11±1 in the (p,n) and (n,p) spectra, respectively, including the component from the isovector spin monopole (IVSM). The spectra are compared with those obtained from a theoretical calculation with a quasiparticle random phase approximation, where the contribution from the IVSM component as well as the interference effect between the GT and IVSM components are fully taken into account. © 2012 American Physical Society.

DOI： 10.1103/PhysRevC.85.061301

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The double-differential cross sections for the 116Cd(p,n) and 116Sn(n,p) reactions were measured at 300 MeV for studying the nuclear matrix element of the 116Cd ββ decay. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) component. The integrated GT strengths up to an excitation energy of 30 MeV in the intermediate nucleus 116In are 40±6 and 11±1 in the (p,n) and (n,p) spectra, respectively, including the component from the isovector spin monopole (IVSM). The spectra are compared with those obtained from a theoretical calculation with a quasiparticle random phase approximation, where the contribution from the IVSM component as well as the interference effect between the GT and IVSM components are fully taken into account.

DOI： 10.1103/PhysRevC.85.061301

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report measurements of cross sections and analyzing powers for reaction angles of θ_lab=0.0-10.0 and complete sets of polarization transfer observables and induced polarizations at θ_lab=0.0-7.0 for the 208Pb(p,n) reaction at a bombarding energy of T_p=296 MeV. A multipole decomposition technique was applied to the data to extract the Gamow-Teller (GT) and spin-dipole (SD) components from the continuum. The polarization observables were also used, for the first time, to separate the SD components into different spin-parity transfer (ΔJπ=0^-, 1^-, and 2^-) contributions. A significant strength with ΔJπ=1⁺ is identified in the continuum beyond the GT giant resonance, which is due to configuration mixing effects and the isovector spin monopole (IVSM) contribution. The SD strength distributions were clearly dependent on ΔJπ, which is reasonably reproduced by Hartree-Fock (HF) plus random phase approximation (RPA) calculations that include the Skyrme interaction with tensor components.

DOI： 10.1103/PhysRevC.85.064606

記述言語：英語   掲載種別：研究論文（学術雑誌）  

High-precision 28Si( p, t)26Si reaction to determine 22Mg(α, p)25Al reaction rates

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The rise time of stellar x-ray bursts is a signature of thermonuclear runaway processes in the atmosphere of neutron stars and is highly sensitive to a series of (α,p) reactions via high-lying resonances in sd-shell nuclei. Lacking data for the relevant resonance levels, the stellar reaction rates have been calculated using statistical, Hauser-Feshbach models, assuming a high-level density. This assumption may not be correct in view of the selectivity of the (α,p) reaction to natural parity states. We measured the 28Si(p,t)26Si reaction with a high-resolution spectrometer to identify resonance levels in 26Si above the α-emission threshold at 9.164 MeV excitation energy. These resonance levels are used to calculate the stellar reaction rate of the 22Mg(α,p)25Al reaction and to test the validity of the statistical assumption.

DOI： 10.1103/PhysRevC.84.025801

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Discrepancy of Cross Sections in pd Breakup Reactions at Ep = 250 MeV

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report measurements of the cross section and a complete set of polarization transfer observables for the 16O(p-,n-)16F reaction at a bombarding energy of T_p = 296 MeV and a reaction angle of θ_lab = 0. The data are compared with distorted-wave impulse approximation calculations employing the large configuration-space shell-model (SM) wave functions. The well-known Gamow-Teller and spin-dipole (SD) states at excitation energies of E_x 8 MeV have been reasonably reproduced by the calculations except for the spin-parity Jπ = 2^- state at E _x = 5.86 MeV. The SD resonance at E_x 9.5 MeV appears to have more Jπ = 2^- strength than Jπ = 1^- strength, consistent with the calculations. The data show significant strength in the spin-longitudinal polarized cross section ID_L(0) at E_x 15 MeV, which indicates the existence of the Jπ = 0^- SD resonance as predicted in the SM calculations.

DOI： 10.1103/PhysRevC.84.014614

記述言語：英語  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Three nucleon force effects in intermediate-energy deuteron analyzing powers for dp elastic scattering

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A complete high precision set of deuteron analyzing powers for elastic deuteron-proton (dp) scattering at 250 MeV/nucleon (MeV/N) has been measured. The new data are presented together with data from previous measurements at 70, 100, 135 and 200 MeV/N. They are compared with the results of three-nucleon (3N) Faddeev calculations based on modern nucleon-nucleon (NN) potentials alone or combined with two models of three nucleon forces (3NFs): the Tucson-Melbourne 99 (TM99) and Urbana IX. At 250 MeV/N large discrepancies between pure NN models and data, which are not resolved by including 3NFs, were found at c.m. backward angles of θc.m.120° for almost all the deuteron analyzing powers. These discrepancies are quite similar to those found for the cross section at the same energy. We found small relativistic effects that cannot resolve the discrepancies with the data indicating that other, short-ranged 3NFs are required to obtain a proper description of the data. © 2011 American Physical Society.

DOI： 10.1103/PhysRevC.83.061001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A complete high precision set of deuteron analyzing powers for elastic deuteron-proton (dp) scattering at 250 MeV/nucleon (MeV/N) has been measured. The new data are presented together with data from previous measurements at 70, 100, 135 and 200 MeV/N. They are compared with the results of three-nucleon (3N) Faddeev calculations based on modern nucleon-nucleon (NN) potentials alone or combined with two models of three nucleon forces (3NFs): the Tucson-Melbourne 99 (TM99) and Urbana IX. At 250 MeV/N large discrepancies between pure NN models and data, which are not resolved by including 3NFs, were found at c.m. backward angles of θ_c.m.120^° for almost all the deuteron analyzing powers. These discrepancies are quite similar to those found for the cross section at the same energy. We found small relativistic effects that cannot resolve the discrepancies with the data indicating that other, short-ranged 3NFs are required to obtain a proper description of the data.

DOI： 10.1103/PhysRevC.83.061001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

In our previous inclusive experiment on ²H(p, p)pn at 247 MeV, the measured cross section at forward angles is about twice larger than 3N calculation with ππ 3NF. Therefore, we have made an exclusive experiment on ²H(p, p₁ p₂)n at the same energy. The preliminary data suggest that the cross section was enhanced at forward angle of θ₁ and θ₂.

DOI： 10.1007/s00601-011-0219-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

In our previous inclusive experiment on H-2(p, p)pn at 247 MeV, the measured cross section at forward angles is about twice larger than 3N calculation with pi pi 3NF. Therefore, we have made an exclusive experiment on H-2(p, p (1) p (2))n at the same energy. The preliminary data suggest that the cross section was enhanced at forward angle of theta (1) and theta (2).

DOI： 10.1007/s00601-011-0219-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Measurements of a complete set of deuteron analyzing powers (iT
₁₁
, T
₂₀
, T
₂₁
, and T
₂₂
) for elastic deuteron-proton scattering at 250 MeV/nucleon have been performed with polarized deuteron beams at RIKEN RI Beam Factory. The obtained data are compared with Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson- Melbourne'99 and UrbanaIX three-nucleon forces.

DOI： 10.1088/1742-6596/312/8/082038

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A complete set of polarization transfer observables has been measured for the ¹⁶O(p, n) reaction at T_p = 296 MeV and θ_lab = 0°. The measured polarization transfer observables are used in order to investigate the spin-parity of the spin-dipole resonance in ¹⁶F. A possible indication of 0^- state has been found at E_x = 11.0 MeV. The obtained results also show the energy hierarchy E_x(2^-) < E_x(0^-) < E _x(l^-), which suggests the importance of the tensor correlations.

DOI： 10.1088/1742-6596/295/1/012122

記述言語：英語   掲載種別：研究論文（学術雑誌）  

An Electric Dipole Moment (EDM) of the elementary particle is a good prove to observe the phenomena beyond the Standard Model. A non-zero EDM shows the violation of the time reversal symmetry, and under the CPT invariance it means the CP violation. In paramagnetic atoms, an electron EDM results in an atomic EDM enhanced by the factor of the 3rd power of the charge of the nucleus due the relativistic effects. A heaviest alkali element francium (Fr), which is the radioactive atom, has the largest enhancement factor K ∼ 895. Then, we are developing a high intensity laser cooled Fr factory at Cyclotron and Radioisotope Center (CYRIC), Tohoku University to perform the search for the EDM of Fr with the accuracy of 10^-29 e·cm. The important points to overcome the current accuracy limit of the EDM are to realize the high intensity Fr source and to reduce the systematic error due to the motional magnetic field and inhomogeneous applied field. To reduce the dominant component of the systematic errors mentioned above, we will confine the Fr atoms in the small region with the Magneto-Optical Trap and optical lattice using the laser cooling and trapping techniques. The construction of the experimental apparatus is making progress, and the new thermal ionizer already produces the Fr of ∼10⁶ ions/s with the primary beam intensity 200 nA. The developments of the laser system and optical equipments are in progress, and the present status and future plan of the experimental project is reported.

DOI： 10.1088/1742-6596/302/1/012051

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

150 MeV FFAG accelerator is under construction at Center for Accelerator and Beam Applied Science on Ito Campus to promote activities in all related scientific, medical, engineering and educational field at Kyushu University. In this paper, status of the development of hardwares and the results of the beam commissioning of the injector are described.

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

The main source of uncertainties in stellar rate calculations of the rp-process and the competing α p-process is often the lack of knowledge of the resonance states above the p- and α- thresholds and their precise energies. We have started a program to study these resonances in protonrich unstable nuclei via the (p; t) and other neutron-pickup reactions using the high resolution spectrometer Grand Raiden. Here, we are presenting the status of the project and recent results of the ²⁵Al(p;γ) reaction rates based on the analysis of measured ²⁸Si(p,t)²⁶Si spectra.

DOI： 10.1063/1.3485201

記述言語：英語   掲載種別：研究論文（学術雑誌）  

High-precision ($p$,$t$) reaction to determine $^{25}{
m Al}$($p,\gamma{}$)$^{26}{
m Si}$ reaction rates

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Since the identification of ongoing Al26 production in the universe, the reaction sequence Mg24(p,γ)Al25(β⁺ν)Mg25(p,γ)Al26 has been studied intensively. At temperatures where the radiative capture on Al25 (t1/2=7.2 s) becomes faster than the β⁺ decay, the production of Al26 can be reduced due to the depletion of Al25. To determine the resonances relevant for the Al25(p,γ)Si26 bypass reaction, we measured the Si28(p,t)Si26 reaction with high-energy precision using the Grand Raiden spectrometer at the Research Center for Nuclear Physics, Osaka. Several new energy levels were found above the p threshold and for known states excitation energies were determined with smaller uncertainties. The calculated stellar rates of the bypass reaction agree well with previous results, suggesting that these rates are well established.

DOI： 10.1103/PhysRevC.82.025807

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Under the assumption of good isospin symmetry, T_z = ±3/2 → ±1/2 Gamow-Teller (GT) transitions in a mass A isobar are analogous, where T_z is the z component of isospin T defined by 1/2(N - Z). We studied the T_z = +3/2 → +1/2 GT transitions by using the ³⁷Cl(³He,t)³⁷Ar and ⁴¹K( ³He,t)⁴¹Ca reactions at E_beam = 140 MeV/nucleon. The GT transition strengths in ³⁷Ar and ⁴¹Ca were obtained up to the excitation energy (E_x) of 14.2 MeV and 10.4 MeV with energy resolutions of 30 and 35 keV, respectively. The obtained GT strengths were compared with those of the T_z = -2/3 → -1/2 mirror transitions, measured by the β-decay of ³⁷Ca and ⁴¹Ti, respectively. It was found that the overall distributions of the mirror transitions were similar in both A = 37 and A = 41 systems. In A = 37 the differences seen at lower excitation energies are suggested to be the effect of the tensor interaction in the charge-exchange reaction. The differences seen at higher excitation energies are suggested to be the effect of the Coulomb interaction that can break the mirror symmetry of the strength distributions.

DOI： 10.1142/S0217732310000782

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Under the assumption of good isospin symmetry, T-z = +/- 3/2 +/- 1/2 Gamow-Teller (GT) transitions in a mass A isobar are analogous, where Tz is the z component of isospin T defined by 1/2(N-Z). We studied the T-z=+3/2 -> +1/2 GT transitions by using the Cl-37(He-3,t)(37) Ar and K-41(He-3,t)(41) Ca reactions at E-beam=140 MeV/nucleon. The GT transition strengths in Ar-37 and Ca-41 were obtained upto the excitation energy (E-x) of 14.2 MeV and 10.4 MeV with energy resolutions of 30 and 35 keV, respectively. The obtained GT strengths were compared with those of the T-z=-2/3 ->-1/2 mirror transitions, measured by the fi-decay of Ca-37 and Ti-41, respectively. It was found that the overall distributions of the mirror transitions were similarin both A=37 and A=41 systems. In A=37 the differences seen at lower excitation energies are suggested to be the effect of the tensorinteraction in the charge-exchange reaction. The differences seen at higher excitation energies are suggested to be the effect of the Coulomb interaction that can break the mirror symmetry of the strength distributions.

DOI： 10.1142/S0217732310000782

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Spectroscopic factors and strength distributions for the deeply bound orbitals in ${}^{40}{
m Ca}$ obtained from the $(\vec{p},2p)$ reaction at 392 MeV

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Spectroscopic factors and strength distributions for the deeply bound orbitals in 40Ca obtained from the (p,2p) reaction at 392 MeV

DOI： 10.1103/PhysRevC.81.044315

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A kinematically complete measurement of the deuteron elastic break reaction has been carried out at E_d = 140 MeV on ¹²C, ⁴⁰Ca, ⁹⁰Zr, and ²⁰⁸Pb targets in a wide angular range of θ_p, θ_n = 0° -8° for a detailed study of the reaction mechanism of loosely bound projectiles in kinematical regions of Coulomb-breakup dominance. A finite-range calculation of the post-form distorted-wave Born approximation is presented.

DOI： 10.1051/epjconf/20100306010

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cross sections and analyzing powers for the Ca40(p□,2p) reaction were measured. The strength distributions for the deep-hole states were obtained by a multipole decomposition analysis. The centroid energies and widths of the hole-state strengths of the 1p and 1s1/2 orbitals in Ca40 were determined. The spectroscopic factors for the deeply bound 1p and 1s1/2 orbitals were extracted as 49±10% and 78±14% of the sum-rule limits of the independent-particle shell model, respectively. A strong influence of the nucleon-nucleon correlations on the spectroscopic factors is suggested.

DOI： 10.1103/PhysRevC.81.044315

記述言語：英語   掲載種別：研究論文（学術雑誌）  

In our previous inclusive experiment on pd breakup at E_p = 247 MeV, we found experimental cross section is about twice larger than 3N calculation with ππ3NF at forward angle. Therefore we made exclusive measurement of ²H(p, p1 p2)n cross section at the same 247 MeV. Preliminary data indicate that the cross section enhancement appears at forward angles of θ₁ and θ₂. We made also inclusive experiment again and confirmed the previous data.

DOI： 10.1051/epjconf/20100305022

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Measurements of a complete set of deuteron analyzing powers (iT₁₁, T₂₀, T₂₁, T₂₂) for elastic deuteron-proton scattering at 250 MeV/nucleon have been performed with polarized deuteron beams at RIKEN RI Beam Factory. The obtained data are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne'99, and UrbanaIX three nucleon forces.

DOI： 10.1051/epjconf/20100305024

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

The double differential cross sections for the ¹¹⁶Cd(p,n) and ¹¹⁶Sn(n,p) reactions at 300 MeV have been measured over a wide excitation-energy region including Gamow-Teller (GT) giant resonance (GTGR) for studying GT transition strengths in the intermediate nucleus of the ¹¹⁶Cd double-β decay, namely ¹¹⁶In. A large amount of the strengths in the β⁺ direction has been newly found in the energy region up to 30 MeV, which may imply that the GT strengths in the GTGR region contribute to the nuclear matrix element of the two-neutrino double-β decay.

DOI： 10.1063/1.3266084

記述言語：英語   掲載種別：研究論文（学術雑誌）  

High-precision (p,t) reaction measurement to determine 18Ne(alpha,p)21Na reaction rates

記述言語：英語   掲載種別：研究論文（学術雑誌）  

x-ray bursts are identified as thermonuclear explosions in the outer atmosphere of accreting neutron stars. The thermonuclear runaway is fueled by the αp process that describes a sequence of (α,p) reactions triggered by the Ne18(α,p)Na21 breakout reaction from the hot CNO cycles. We studied the level structure of the compound nucleus Mg22 by measuring the Mg24(p,t)Mg22 reaction at the Grand Raiden spectrometer at Research Center for Nuclear Physics, Osaka. A large number of α-unbound states was identified and precise excitation energies were determined. Based on shell model and α-cluster model calculations we predict the level parameters for determining the stellar reaction rate of Ne18(α,p)Na21 for a wide temperature range. x-ray burst simulations have been performed to study the impact of the reaction on the x-ray burst luminosity.

DOI： 10.1103/PhysRevC.80.055804

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have developed a tracking detector with a gas electron multiplier (GEM) for nuclear experiments. The developed GEM detector was installed inside the dipole magnet used for transporting the primary beam to the beam dump and it was used to measure the momentum of charged particles. A sufficiently high spatial resolution was achieved at a high counting rate and a magnetic field for coherent pion production with a 392 MeV proton beam to study the short-range component of the residual nuclear interaction. The detector systems and development procedure are described.

DOI： 10.1016/j.nima.2009.06.051

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The double-differential cross sections for the Ca48(p,n) and Ti48(n,p) reactions were measured at 300MeV. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) components. The integrated GT strengths up to an excitation energy of 30MeV in Sc48 are 15.3±2.2 and 2.8±0.3 in the (p,n) and (n,p) spectra, respectively. In the (n,p) spectra additional GT strengths were found above 8MeV where shell models within the fp shell-model space predict almost no GT strengths, suggesting that the present shell-model description of the nuclear matrix element of the two-neutrino double-β decay is incomplete.

DOI： 10.1103/PhysRevLett.103.012503

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The double-differential cross sections for the Ca48(p,n) and Ti48(n,p) reactions were measured at 300MeV. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) components. The integrated GT strengths up to an excitation energy of 30MeV in Sc48 are 15.3±2.2 and 2.8±0.3 in the (p,n) and (n,p) spectra, respectively. In the (n,p) spectra additional GT strengths were found above 8MeV where shell models within the fp shell-model space predict almost no GT strengths, suggesting that the present shell-model description of the nuclear matrix element of the two-neutrino double-β decay is incomplete. © 2009 The American Physical Society.

DOI： 10.1103/PhysRevLett.103.012503

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

We present measurements of the cross section and a complete set of polarization observables for the Gamow-Teller¹²C(p→, n→)¹²N(g.s.; 1⁺) reaction at an incident proton energy of 296 MeV. The complete set of polarization observables is used to separate the cross section into spin-longitudinal and spin-transverse components. From the comparison with the distorted wave impulse approximation calculations employing random phase approximation response functions, we found that our data showed the existence of the pionic and rho-mesonic correlations in nuclei.

DOI： 10.1063/1.3215739

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Differential cross sections and complete sets of polarization observables are presented for the Gamow-Teller C12(p→,n→)N12(g.s.,1+) reaction at a bombarding energy of 296 MeV with momentum transfers q of 0.1 to 2.2 fm-1. The polarization transfer observables are used to deduce the spin-longitudinal cross section, IDq, and spin-transverse cross sections, IDp and IDn. The data are compared with calculations based on the distorted-wave impulse approximation (DWIA) using shell-model wave functions. Significant differences between the experimental and theoretical results are observed for all three spin-dependent IDi at momentum transfers of q O. 5 -1, suggesting the existence of nuclear correlations beyond the shell model. We also performed DWIA calculations employing random-phase approximation (RPA) response functions and found that the observed discrepancy is partly resolved by the pionic and -mesonic correlation effects.

DOI： 10.1103/PhysRevC.80.024319

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

The pion is the most important ingredient for nuclear forces, and it leads to various phenomena such as the three nucleon forces, tensor correlations, and pion condensation. These very interesting phenomena have been extensively investigated by accumulating high-precision experimental data on various observables. Three topics are discussed by comparing these data with recent sophisticated calculations; three nucleon force effects in few nucleon systems, short-range and tensor correlations on spin and isospin responses, and pionic correlations at large momentum transfers.

DOI： 10.1063/1.3215628

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Gamow-Teller Strength Distributions in 48Sc by the 48Ca(p,n) and 48Ti(n,p) Reactions and Two-Neutrino Double-beta Decay Nuclear Matrix Elements

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Three-nucleon force effects in the 1H(d,pp)n reaction at 135 MeV/nucleon

記述言語：英語  

The deuteron to proton polarization transfer coefficients Kyyy&#039; and Kyy&#039; together with the deuteron analyzing powers are measured in three coplanar configurations of the deuteron-proton breakup reaction with a 135-MeV/nucleon polarized deuteron beam at the RIKEN Accelerator Research Facility. The data are compared with theoretical predictions based on exact solutions of the three-nucleon (3N) Faddeev equations with high-precision nucleon-nucleon (NN) forces, alone or combined with two 3N force (3NF) models, the 2π-exchange Tucson-Melbourne&#039;(99) (TM&#039;99) and Urbana IX. Large 3NF effects have been found for all the measured observables. Predicted effects are supported by the data, with the exception of the vector analyzing power Ayd. For this observable, theory based on only NN forces is sufficient to explain the data. The behavior of the breakup analyzing powers is found to be different from the corresponding observables in elastic nucleon-deuteron scattering. © 2009 The American Physical Society.

DOI： 10.1103/PhysRevC.79.054008

記述言語：英語  

The deuteron to proton polarization transfer coefficients Ky yy and Ky y together with the deuteron analyzing powers are measured in three coplanar configurations of the deuteron-proton breakup reaction with a 135-MeV/nucleon polarized deuteron beam at the RIKEN Accelerator Research Facility. The data are compared with theoretical predictions based on exact solutions of the three-nucleon (3N) Faddeev equations with high-precision nucleon-nucleon (NN) forces, alone or combined with two 3N force (3NF) models, the 2π-exchange Tucson-Melbourne(99) (TM99) and Urbana IX. Large 3NF effects have been found for all the measured observables. Predicted effects are supported by the data, with the exception of the vector analyzing powerAd y . For this observable, theory based on onlyNN forces is sufficient to explain the data. The behavior of the breakup analyzing powers is found to be different from the corresponding observables in elastic nucleon-deuteron scattering.

DOI： 10.1103/PhysRevC.79.054008

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The deuteron to proton polarization transfer coefficients Kyyy' and Kyy' together with the deuteron analyzing powers are measured in three coplanar configurations of the deuteron-proton breakup reaction with a 135-MeV/nucleon polarized deuteron beam at the RIKEN Accelerator Research Facility. The data are compared with theoretical predictions based on exact solutions of the three-nucleon (3N) Faddeev equations with high-precision nucleon-nucleon (NN) forces, alone or combined with two 3N force (3NF) models, the 2π-exchange Tucson-Melbourne'(99) (TM'99) and Urbana IX. Large 3NF effects have been found for all the measured observables. Predicted effects are supported by the data, with the exception of the vector analyzing power Ayd. For this observable, theory based on only NN forces is sufficient to explain the data. The behavior of the breakup analyzing powers is found to be different from the corresponding observables in elastic nucleon-deuteron scattering.

DOI： 10.1103/PhysRevC.79.054008

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Development of GEM tracking detector for intermediate-energy nuclear experiments

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross section and analyzing power A(y) of (2)H((p) over right arrow, p)pn reaction at E((p) over right arrow) = 247 MeV were measured and large disagreement with 3N calculations were found especially at forward angles. Effect of 2 pi 3NF are too small to explain the discrepancy. To microscopically investigate the discrepancy, a (2)H(p, pp)n experiment is planned.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We made again an experiment of pd radiative capture at E (d) over right arrow = 197 MeV, and obtained A(xx), A(yy) and A(zz) (= -A(xx) -A(yy)) data using a newly-developed data-analysis method of high detection efficiency. Re-analysis of previous data on A(xx) amd A(yy) was also made using a new method. All the new previous data 197 MeV agree to each other, and A(xx) anomaly has been confirmed.

DOI： 10.1142/S0217732309000103

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross section and analyzing power A_y of ²H p,p)pn reaction at E_p→ = 247 MeV were measured and large disagreements with 3N calculations were found especially at forward angles. Effects of 2π3NF are too small to explain the discrepancy. To microscopically investigate the discrepancy, a ²H(p,pp)n experiment is planned.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We made again an experiment of pd radiative capture at E_d→ = 197 MeV, and obtained A_xx, A_yy and A_zz (= -A_xx - A_yy) data using a newly-developed data-analysis method of high detection efficiency. Re-analysis of previous data on A _xx and A_yy was also made using a new method. All the new and previous data at 197 MeV agree to each other, and A_xx anomaly has been confirmed.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

²²Mg, ³⁰S, ³⁴Ar and ³⁸Ca have been investigated using (p,t) reactions at RCNP with the intent of identifying energy levels in nuclei that determine the reaction rates along the pathway of the αp-process. These experiments exploit the high resolution and 0° capabilities of the Grand Raiden spectrometer and the WS beamline, which can deliver a fully dispersion matched beam to target. The level information is vital to understanding the nucleosynthesis occurring during explosive hydrogen burning, which, for example, is thought to occur during type I X-ray bursts. In the case of ²²Mg, new reaction rate calculations have been performed for the ¹⁸Ne(α,p)²¹Na reaction. The experimental technique will be discussed, and the experimental results will be presented.

DOI： 10.1063/1.3087029

記述言語：英語   掲載種別：研究論文（学術雑誌）  

High resolution study of isovector negative parity states in the 16O(3He, t)16F reaction at 140 MeV/nucleon

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The isovector transitions from the ground state (g.s.) of O16 to the negative parity states in F16, i.e., the Jπ=0- g.s., the 0.193 MeV, 1- state, the 0.424 MeV, 2- state, the 0.721 MeV, 3- state, and the 4- "stretched" state at 6.372 MeV, were studied by using a high resolution O16(He3,t)F16 reaction at 140 MeV/nucleon. With the help of high energy resolution, these states were, for the first time, clearly resolved in a charge exchange reaction at an intermediate energy, which favorably excites spin-flip states. Angular distributions of the reaction cross sections were measured in the laboratory frame from 0° to 14°. Parameters of phenomenological effective interactions were derived so as to reproduce these angular distributions in distorted wave Born approximation (DWBA) calculations. The angular distribution of the 0- state could be reproduced well at θc.m.<10°. The empirical values, however, are larger by a factor of 2-2.5 in the larger angle region, where the contribution of the so-called "condensed pion field" is expected. The high resolution also enabled the decay widths of these states to be measured. © 2009 The American Physical Society.

DOI： 10.1103/PhysRevC.79.024314

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Gamow-Teller unit cross sections of the (p,n) reaction at 198 and 297 MeV on medium-heavy nuclei
Gamow-Teller (GT) unit cross sections, sigma(GT), are obtained at 198 and 297 MeV by measuring the double differential cross sections at 0(degrees) for the (p,n) reaction on Ni-58, Zn-70, Cd-114, Sn-118, and Sn-120. The mass dependence of sigma(GT) and the ratio of sigma(GT) to the Fermi unit cross section, sigma(F), (R-2) are also derived in the mass region of 58 <= A <= 120. The sigma(GT) value for Zr-90 at 297 MeV interpolated using the A-dependence obtained herein agrees with that used in a previous analysis where the GT transition strength over a wide energy region up to the continuum was discussed. However, the deduced Ni-64 sigma(GT) value at 198 MeV is 20&#37; smaller than that obtained from the analysis of a previous (n,p) measurement. The present R-2 values in the mass region heavier than Ca-42 are larger than those in the region up to Ca-42 and increase as a function of A.

DOI： 10.1103/PhysRevC.79.024602

記述言語：その他  

Gamow-Teller (GT) unit cross sections, σGT, are obtained at 198 and 297 MeV by measuring the double differential cross sections at 0° for the (p,n) reaction on Ni58, Zn70, Cd114, Sn118, and Sn120. The mass dependence of σGT and the ratio of σGT to the Fermi unit cross section, σF, (R2) are also derived in the mass region of 58≤A≤120. The σGT value for Zr90 at 297 MeV interpolated using the A-dependence obtained herein agrees with that used in a previous analysis where the GT transition strength over a wide energy region up to the continuum was discussed. However, the deduced Ni64σGT value at 198 MeV is 20% smaller than that obtained from the analysis of a previous (n,p) measurement. The present R2 values in the mass region heavier than Ca42 are larger than those in the region up to Ca42 and increase as a function of A. © 2009 The American Physical Society.

DOI： 10.1103/PhysRevC.79.024602

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The isovector transitions from the ground state (g.s.) of O16 to the negative parity states in F16, i.e., the Jπ=0- g.s., the 0.193 MeV, 1- state, the 0.424 MeV, 2- state, the 0.721 MeV, 3- state, and the 4- "stretched" state at 6.372 MeV, were studied by using a high resolution O16(He3,t)F16 reaction at 140 MeV/nucleon. With the help of high energy resolution, these states were, for the first time, clearly resolved in a charge exchange reaction at an intermediate energy, which favorably excites spin-flip states. Angular distributions of the reaction cross sections were measured in the laboratory frame from 0° to 14°. Parameters of phenomenological effective interactions were derived so as to reproduce these angular distributions in distorted wave Born approximation (DWBA) calculations. The angular distribution of the 0- state could be reproduced well at θc.m.<10°. The empirical values, however, are larger by a factor of 2-2.5 in the larger angle region, where the contribution of the so-called "condensed pion field" is expected. The high resolution also enabled the decay widths of these states to be measured.

DOI： 10.1103/PhysRevC.79.024314

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Gamow-Teller (GT) unit cross sections, σGT, are obtained at 198 and 297 MeV by measuring the double differential cross sections at 0° for the (p,n) reaction on Ni58, Zn70, Cd114, Sn118, and Sn120. The mass dependence of σGT and the ratio of σGT to the Fermi unit cross section, σF, (R2) are also derived in the mass region of 58≤A≤120. The σGT value for Zr90 at 297 MeV interpolated using the A-dependence obtained herein agrees with that used in a previous analysis where the GT transition strength over a wide energy region up to the continuum was discussed. However, the deduced Ni64σGT value at 198 MeV is 20% smaller than that obtained from the analysis of a previous (n,p) measurement. The present R2 values in the mass region heavier than Ca42 are larger than those in the region up to Ca42 and increase as a function of A.

DOI： 10.1103/PhysRevC.79.024602

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Gamow-Teller unit cross sections of the (p,n) reaction at 198 and 297 MeV on medium-heavy nuclei

記述言語：英語   掲載種別：研究論文（学術雑誌）  

High resolution study of isovector negative parity states in the 16O(3He,t)16F reaction at 140 MeV/nucleon

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Gamow-Teller unit cross sections of the (p, n) reaction at 198 and 297 MeV on medium-heavy nuclei

記述言語：英語   掲載種別：研究論文（学術雑誌）  

In our previous measurement of pd radiative capture at E (d) = 137 and 196 MeV, we found an interesting fact that the measured tensor analyzing powers show the relation A (xx) a parts per thousand A (yy) , although calculated A (xx) and A (yy) are apparently different, A (xx) not equal A (yy) . The measured A (yy) agrees fairly well with the 3N calculations, and the measured A (xx) largely disagrees with calculated A (xx) . Similar experiments on pd capture have been made at KVI at nearly the same energies of 130-180 MeV. The KVI data also support A (xx) a parts per thousand A (yy) relation, but absolute values of A (xx) and A (yy) at KVI are about half of RCNP data. Therefore, we made a new experiment of pd capture at E (d) = 196 MeV. A (zz) was measured in three different ways, and data analysis is in progress. Preliminary data seem to support our previous data.

DOI： 10.1007/s00601-008-0285-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Inclusive measurements of the D(p, p)pn reaction were made at incident proton energies of 248 MeV and 13 MeV, to investigate the global feature of the pd breakup reaction at intermediate and low energies. At 248 MeV, the cross section and analyzing power A (y) were measured at four angles from 7A degrees to 20A degrees. The data largely disagree with Faddeev calculations even if 2 pi-exchange three-nucleon force (2 pi 3NF) or Delta-isobar is included, and the disagreement increases at forward angles. At 13 MeV, the cross section was measured at eight angles from 10A degrees to 70A degrees. The data are well reproduced by a recent pd Faddeev calculation, and the effects of Delta-isobar at 13 MeV are very small.

DOI： 10.1007/s00601-008-0255-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

In our previous measurement of pd radiative capture at E_d = 137 and 196MeV, we found an interesting fact that the measured tensor analyzing powers show the relation A_xx ≈ A_yy, although calculated A_xx and A_yy are apparently different, A_xx ≠ A_yy. The measured A_yy agrees fairly well with the 3N calculations, and the measured A_xx largely disagrees with calculated A_xx. Similar experiments on pd capture have been made at KVI at nearly the same energies of 130-180MeV. The KVI data also support A_xx ≈ A_yy relation, but absolute values of A_xx and A_yy at KVI are about half of RCNP data. Therefore, we made a new experiment of pd capture at E_d =196MeV. A_zz was measured in three different ways, and data analysis is in progress. Preliminary data seem to support our previous data.

DOI： 10.1007/s00601-008-0285-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Inclusive measurements of the D(p, p)pn reaction were made at incident proton energies of 248MeV and 13MeV, to investigate the global feature of the pd breakup reaction at intermediate and low energies. At 248MeV, the cross section and analyzing power A_y were measured at four angles from 7°C to 20°C. The data largely disagree with Faddeev calculations even if 2π-exchange three-nucleon force (2π3NF) or Δ-isobar is included, and the disagreement increases at forward angles. At 13MeV, the cross section was measured at eight angles from 10°C to 70°C. The data are well reproduced by a recent pd Faddeev calculation, and the effects of Δ-isobar at 13MeV are very small.

DOI： 10.1007/s00601-008-0255-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cross sections and analyzing powers for (p,n) reactions on He3 and He4 have been measured at a bombarding energy of Tp=346 MeV and reaction angles of 8=9.4-27°. The energy transfer spectra for 3He(p,n) at large 8 (16°) are dominated by quasielastic contributions and can be reasonably reproduced by plane-wave impulse approximation (PWIA) calculations for quasielastic scattering. By contrast, the known L=1 resonances in Li4 are clearly observed near the threshold in the 4He(p,n) spectra. Because these contributions are remarkable at small angles, the energy spectra are significantly different from those expected for quasielastic scattering. The data are compared with the PWIA calculations, and it is found that the quasielastic contributions are dominant at large 8 (22°). The nuclear correlation effects on the quasielastic peak for 4He(p,n) are also discussed.

DOI： 10.1103/PhysRevC.78.024607

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cross sections and analyzing powers for (p,n) reactions on He3 and He4 have been measured at a bombarding energy of Tp=346 MeV and reaction angles of 8=9.4-27°. The energy transfer spectra for 3He(p,n) at large 8 (16°) are dominated by quasielastic contributions and can be reasonably reproduced by plane-wave impulse approximation (PWIA) calculations for quasielastic scattering. By contrast, the known L=1 resonances in Li4 are clearly observed near the threshold in the 4He(p,n) spectra. Because these contributions are remarkable at small angles, the energy spectra are significantly different from those expected for quasielastic scattering. The data are compared with the PWIA calculations, and it is found that the quasielastic contributions are dominant at large 8 (22°). The nuclear correlation effects on the quasielastic peak for 4He(p,n) are also discussed. © 2008 The American Physical Society.

DOI： 10.1103/PhysRevC.78.024607

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A facility for studying (n,p) reactions at neutron kinetic energies of 140 ≲ T_n ≲ 300 MeV has been constructed by using the existing Large Acceptance Spectrometer at the Research Center for Nuclear Physics, Osaka University. A neutron beam produced by the ⁷Li(p,n) reaction hits the (n,p) targets located in a segmented target system, which allows one to use a relatively thick target in total (∼ 0.5 g / cm²) with a moderate energy resolution of ∼ 1 MeV. The facility enables one to obtain spectra at 300 MeV up to an excitation energy of 70 MeV with a single setting of the spectrometer. This (n,p) facility has a large effective solid angle of 11 msr for an effective target size of 30^W × 20^H mm².

DOI： 10.1016/j.nima.2008.03.014

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A facility for studying (n,p) reactions at neutron kinetic energies of 140 less than or similar to T-n less than or similar to 300 MeV has been constructed by using the existing Large Acceptance Spectrometer at the Research Center for Nuclear Physics, Osaka University. A neutron beam produced by the Li-7(p,n) reaction hits the (n,p) targets located in a segmented target system, which allows one to use a relatively thick target in total (similar to 0.5 g/cm(2)) with a moderate energy resolution of similar to 1 MeV. The facility enables one to obtain spectra at 300 MeV up to an excitation energy of 70 MeV with a single setting of the spectrometer. This (n,p) facility has a large effective solid angle of 11 msr for an effective target size of 30(W) x 20(H) mm(2). (C) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2008.03.014

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report measurements of the cross-section and a complete set of polarization transfer coefficients for the 3He(p,n) reaction at a bombarding energy Tp=346 MeV and a reaction angle θlab=0°. The data are compared with the corresponding free nucleon-nucleon values on the basis of the predominance of quasielastic scattering processes. Significant discrepancies have been observed in the polarization transfer DLL(0°), which are presumably the result of the three-proton T=3/2 resonance. The spin-parity of the resonance is estimated to be 1/2-, and the distribution is consistent with previous results obtained for the same reaction at Tp=48.8 MeV.

DOI： 10.1103/PhysRevC.77.054611

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report measurements of the cross-section and a complete set of polarization transfer coefficients for the 3He(p,n) reaction at a bombarding energy Tp=346 MeV and a reaction angle θlab=0°. The data are compared with the corresponding free nucleon-nucleon values on the basis of the predominance of quasielastic scattering processes. Significant discrepancies have been observed in the polarization transfer DLL(0°), which are presumably the result of the three-proton T=3/2 resonance. The spin-parity of the resonance is estimated to be 1/2-, and the distribution is consistent with previous results obtained for the same reaction at Tp=48.8 MeV. © 2008 The American Physical Society.

DOI： 10.1103/PhysRevC.77.054611

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

Recently it was found that, the differential cross sections of elastic Nd scattering below 150 MeV can be well reproduced by incorporating a 3NF in Faddeev calculations based on modern nucleon-nucleon (NN) interactions. On the other hand, the differential cross sections for nd and pd at 250 MeV show large discrepancies between the data and the Faddeev calculations with a 3NF. This indicates the existence of the missing features of the three nucleon force in this energy region. For the next step in the 3NF study, we have measured the vector analyzing power A_y and the differential cross sections for the ²H(p̄, pp)n breakup reaction at 250 MeV. The experiment, was carried out by detecting two protons in the final state with using the double-armed spectrometer Grand Raiden (GR) and the Large Acceptance Spectrometer (LAS) at the Research Center for Nuclear Physics (RCNP). The data was compared with the results of Faddeev calculations with and without a 3NF.

DOI： 10.1063/1.2932286

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

Inclusive experiments for D(p,p)pn breakup were performed at incident proton energies of 247 MeV and 13 MeV. At 247 MeV, the cross sections and analyzing power A_y measured at angles from 7° to 20° largely disagree with calculations even if a 2π-exchange three-nucleon force (2π3NF) effects are included, and the disagreement increases at forward angles. At 13 MeV, cross section measured at angles from 10° to 70° agrees well with pd calculation and 2π3NF effects are small. The large disagreement in pd breakup at 247 MeV may have some relationship with disagreements in pd scattering at 250 MeV.

DOI： 10.1063/1.2932313

記述言語：英語   掲載種別：研究論文（学術雑誌）  

High Rate Production of Polarized 3He with Meta-Stability Exchange Method

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1143/JPSJ.77.025002

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Complete Set of Polarization Transfer Observables for the 12C( p,n) Reaction at 296 MeV and 0°

記述言語：英語   掲載種別：研究論文（学術雑誌）  

New measurement of the energy dependence of pion production on a copper target near 350-MeV proton energy has been performed. The E-170 experiment has been carried out at the Ring Cyclotron Facility of the Research Center for Nuclear Physics, Osaka University, Japan. A small enhancement of the low-energy pion production cross section was observed near the incident proton energy of 352 MeV.

DOI： 10.1007/s11450-008-1001-3

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A complete set of polarization transfer observables has been measured for the ¹²C(p, n) reaction at T_p = 296MeV and θ_lab = 0°. The measured polarization transfer observables indicate that the spin-dipole resonance at E_x ≃ 7MeV has greater 2^- strength than 1^- strength, which is consistent with recent experimental and theoretical studies. The total spin transfer Σ(0°) deduced from the polarization transfer observables indicates a predominance of the spin-flip strength in the continuum. The exchange tensor interaction at a large momentum transfer of Q ≃ 3:6 fm^-1 is discussed.

DOI： 10.1143/JPSJ.77.014201

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report measurements of the cross section and a complete set of polarization observables for the Gamow-Teller ¹²C (over(p, →), over(n, →)) ¹²N (g.s., 1⁺) reaction at a bombarding energy of 296 MeV. The data are compared with distorted wave impulse approximation calculations employing transition form factors normalized to reproduce the observed beta-decay ft value. The cross section is significantly under-predicted by the calculations at momentum transfers q ≳ 0.5   fm^-1. The discrepancy is partly resolved by considering the non-locality of the nuclear mean field. However, the calculations still under-predict the cross section at large momentum transfers of q ≃ 1.6   fm^-1. We also performed calculations employing random phase approximation response functions and found that the observed enhancement can be attributed in part to pionic correlations in nuclei.

DOI： 10.1016/j.physletb.2007.10.017

記述言語：その他  

Three-body cluster state in 11B

DOI： 10.1016/j.nuclphysa.2007.03.047

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We measured the differential cross section and the spin correlation parameter Cyy of the p→+3He→ elastic backward scattering at 200, 300, and 400 MeV at θ=180° in the center-of-mass frame to study the mechanism of the reaction and to examine the validity of the He3 wave functions based on two different realistic two-body forces. This is the first measurement of the spin correlation parameter Cyy of the p→+3He→ EBS at intermediate energies. The experimental results were compared with few-body calculations, including three reaction mechanisms: two-nucleon-pair exchange, pion exchange, and direct pp scattering. It was found that few-body calculations describe the differential cross-section data reasonably well. The spin correlation parameter Cyy shows clear evidence for the two-nucleon-pair exchange processes in the reaction, demonstrating that the spin observables are helpful for deeper understanding of the reaction mechanism.

DOI： 10.1103/PhysRevC.76.044003

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We measured the differential cross section and the spin correlation parameter Cyy of the p→+3He→ elastic backward scattering at 200, 300, and 400 MeV at θ=180° in the center-of-mass frame to study the mechanism of the reaction and to examine the validity of the He3 wave functions based on two different realistic two-body forces. This is the first measurement of the spin correlation parameter Cyy of the p→+3He→ EBS at intermediate energies. The experimental results were compared with few-body calculations, including three reaction mechanisms: two-nucleon-pair exchange, pion exchange, and direct pp scattering. It was found that few-body calculations describe the differential cross-section data reasonably well. The spin correlation parameter Cyy shows clear evidence for the two-nucleon-pair exchange processes in the reaction, demonstrating that the spin observables are helpful for deeper understanding of the reaction mechanism. © 2007 The American Physical Society.

DOI： 10.1103/PhysRevC.76.044003

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

From the recent studies, it has been found that the differential cross sections of the elastic Nd scattering at the energy below 150 MeV can be well reproduced by incorporating the 3NF in the Faddeev calculation based on modern nucleon-nucleon (NN) interactions. On the other hand, the differential cross sections of nd and pd at 250 MeV show large discrepancies between the data and the Faddeev calculations with 3NF. It indicates the presence of the missing features of the three nucleon system at this energy region. For the next step of the 3NF study, we measured the vector analyzing power A_y and the differential cross sections for the ²H(p, pp)n breakup reaction at 250 MeV. The experiment was carried out by detecting two protons in the final state with using the double-armed spectrometer Grand Raiden (GR) and Large Acceptance Spectrometer (LAS) at Research Center for Nuclear Physics (RCNP). These data provide important information on the 3NF effects and make a discrimination between 3NF models.

DOI： 10.1063/1.2750894

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

A measurement of tensor analyzing power A_xx and A_yy of H(d, ³He)γ reaction at E_d = 137 MeV was made at RCNP. Both the relation of A_xx ≈ A_yy and the discrepancy in A_xx between experiment and calculations were confirmed at 137 MeV, in consistent with our previous measurement at 196 MeV. Present data are compared with KVI data at 133 MeV.

DOI： 10.1063/1.2750892

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

The short range component of the nucleon-nucleus interaction is phenomenologically described by effective interaction including the so-called Landau-Migdal parameters g′, among which only g _ΔΔ^′ has been left unfixed because of the scarcity of experimental information. We propose Coherent Pion Production (CPP) measurement ¹²C(p, nπ⁺)¹²C(g.s.) to get quantitative information on g_ΔΔ^′. A preliminary CPP experiment was performed at the RCNP neutron time of flight facility by involving exclusive measurement of pions and neutrons. We have specially developed for this purpose a new pion counter and embedded it in the beam swinger magnet of the neutron time of flight facility. We describe the experiment and preliminary result from the pion-neutron coincidences.

DOI： 10.1063/1.2750899

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Inelastic α scattering on ¹⁶O is studied at 400 MeV using an ice target. Near the 4α breakup threshold of 14.4 MeV, a broad peak is observed at an excitation energy of 13.6 ± 0.1  MeV with a width of 0.6 ± 0.2  MeV. The spin-parity is estimated to be 0⁺ from the momentum-transfer dependence. The observed width is significantly larger than that of the 0⁺ state at 12.0 MeV with the α + ¹²C structure, indicating a well-developed α cluster structure. The magnitude of the cross section is sensitive to the density distribution of the constituent α clusters. The observed cross section is consistent with the theoretical prediction for the α cluster condensed state, characterized by its dilute density distribution with a large root-mean-square radius.

DOI： 10.1016/j.physletb.2007.08.016

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

The cross sections and spin observables of the pd elastic scattering have been measured at 392 MeV. The results are compared with the prediction of Faddeev calculations with and without including a three nucleon force.

DOI： 10.1063/1.2750890

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The differential cross sections and vector analyzing powers for nd elastic scattering at En=248 MeV were measured for 10°-180° in the center-of-mass (c.m.) system. To cover the wide angular range, the experiments were performed separately by using two different setups for forward and backward angles. The data are compared with theoretical results based on Faddeev calculations with realistic nucleon-nucleon (NN) forces such as AV18, CD Bonn, and Nijmegen I and II, and their combinations with the three-nucleon forces (3NFs), such as Tucson-Melbourne 99 (TM99), Urbana IX, and the coupled-channel potential with Δ-isobar excitation. Large discrepancies are found between the experimental cross sections and theory with only 2N forces for θc.m.>90°. The inclusion of 3NFs brings the theoretical cross sections closer to the data but only partially explains this discrepancy. For the analyzing power, no significant improvement is found when 3NFs are included. Relativistic corrections are shown to be small for both the cross sections and the analyzing powers at this energy. For the cross sections, these effects are mostly seen in the very backward angles. Compared with the pd cross section data, quite significant differences are observed at all scattering angles that cannot be explained only by the Coulomb interaction, which is usually significant at small angles.

DOI： 10.1103/PhysRevC.76.014004

記述言語：英語  

The differential cross sections and vector analyzing powers for nd elastic scattering at En=248 MeV were measured for 10°–180° in the center-of-mass (c.m.) system. To cover the wide angular range, the experiments were performed separately by using two different setups for forward and backward angles. The data are compared with theoretical results based on Faddeev calculations with realistic nucleon-nucleon (NN) forces such as AV18, CD Bonn, and Nijmegen I and II, and their combinations with the three-nucleon forces (3NFs), such as Tucson-Melbourne 99 (TM99), Urbana IX, and the coupled-channel potential with Delta-isobar excitation. Large discrepancies are found between the experimental cross sections and theory with only 2N forces for thetac.m.>90°. The inclusion of 3NFs brings the theoretical cross sections closer to the data but only partially explains this discrepancy. For the analyzing power, no significant improvement is found when 3NFs are included. Relativistic corrections are shown to be small for both the cross sections and the analyzing powers at this energy. For the cross sections, these effects are mostly seen in the very backward angles. Compared with the pd cross section data, quite significant differences are observed at all scattering angles that cannot be explained only by the Coulomb interaction, which is usually significant at small angles.

DOI： 10.1103/PhysRevC.76.014004

記述言語：英語  

The differential cross sections and vector analyzing powers for nd elastic scattering at En=248 MeV were measured for 10°-180° in the center-of-mass (c.m.) system. To cover the wide angular range, the experiments were performed separately by using two different setups for forward and backward angles. The data are compared with theoretical results based on Faddeev calculations with realistic nucleon-nucleon (NN) forces such as AV18, CD Bonn, and Nijmegen I and II, and their combinations with the three-nucleon forces (3NFs), such as Tucson-Melbourne 99 (TM99), Urbana IX, and the coupled-channel potential with Δ-isobar excitation. Large discrepancies are found between the experimental cross sections and theory with only 2N forces for θc.m.>90°. The inclusion of 3NFs brings the theoretical cross sections closer to the data but only partially explains this discrepancy. For the analyzing power, no significant improvement is found when 3NFs are included. Relativistic corrections are shown to be small for both the cross sections and the analyzing powers at this energy. For the cross sections, these effects are mostly seen in the very backward angles. Compared with the pd cross section data, quite significant differences are observed at all scattering angles that cannot be explained only by the Coulomb interaction, which is usually significant at small angles. © 2007 The American Physical Society.

DOI： 10.1103/PhysRevC.76.014004

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The differential cross sections and the vector analyzing powers for the nd elastic scattering at E_n = 250 MeV have been measured for the study of the three-nucleon force (3NF) effects in the Coulomb-free system. To cover a wide angular region, the experiments were performed by using two different methods at the (n, p) facility and at the NTOF facility which constructed at the Research Center for Nuclear Physics (RCNP). The results were compared with theoretical predictions of the Faddeev calculations based on the modern nucleon-nucleon (NN) forces with the three-nucleon force (3NF). The inclusion of 3NFs leads to a good description of the cross section except for the backward angles. The results were also compared with the theoretical predictions with relativistic corrections. The direct data-to-data comparison of the cross sections of the nd and pd was performed.

DOI： 10.1016/j.nuclphysa.2007.03.138

記述言語：その他  

Study of spin parts of three nucleon forces via (d)over-right-arrowp breakup reactions at intermediate energies

DOI： 10.1016/j.nuclphysa.2007.03.174

記述言語：その他  

Measurements of the (n)over-right-arrowd scattering at 250 MeV and three-nucleon forces

DOI： 10.1016/j.nuclphysa.2007.03.138

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cluster structures of the excited states in ¹¹B are studied by analyzing the isoscalar monopole and quadrupole strengths in the ¹¹B(d,d^′) reaction at E_d = 200  MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3 / 2₃ ^- state at E_x = 8.56  MeV is well described by the AMD calculation and is an evidence for a developed three-body 2 α + t cluster structure.

DOI： 10.1016/j.nuclphysa.2007.03.047

記述言語：英語  

A measurement of tenser analyzing power A(xx) and A(yy) of H((d) over right arrow,He-3)gamma reaction at E-(d) over right arrow=137 MeV was made at RCNP. Both the relation of A(xx) A(yy) and the discrepancy in A(xx) between experiment and calculations were confirmed at 137 MeV, in consistent with our previous measurement at 196 MeV. Present data are compared with KVI data at 133 MeV.

DOI： 10.1016/j.nuclphysa.2007.03.175

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Measurements of deuteron-proton breakup reactions at 135 MeV/A have been made at RIKEN Accelerator Research Facility, focusing on the specific coplanar configurations. The obtained results are compared with the Faddeev calculations based on the modern nucleon-nucleon forces together with the Tucson-Melbourne99, and UrbanaIX three nucleon forces.

DOI： 10.1016/j.nuclphysa.2007.03.174

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The ¹¹⁶Cd(p,n) experiment at 300 MeV has been performed for deducing the Gamow-Teller (GT) transition strengths B(GT^-) in ¹¹⁶In. For the transition to the ground state, the B(GT^-) value of 0.26 ± 0.02 is obtained. From this B(GT^-) value and the B(GT⁺) value by a beta-decay experiment, the contribution of the intermediate ground state of ¹¹⁶In to the nuclear matrix element is deduced to be 0.070 ± 0.003. The B(GT^-) value obtained herein is a factor of 8 less than that obtained from a previous (³He,t) measurement. This discrepancy, as well as differences in the distribution of low energy GT strength, and the width and peak energy of the GT giant resonance may be explained if the target used in the (³He,t) measurement is a Cd target with natural abundance.

DOI： 10.1016/j.nuclphysa.2007.01.051

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cluster structures of the excited states in ¹¹B are studied by analyzing the isoscalar monopole and quadrupole strengths in the ¹¹B(d,d′) reaction at E_d = 200  MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3 / 2₃^- state at E_x = 8.56  MeV is well described by the AMD calculation and is an evidence for a developed 2 α + t cluster structure.

DOI： 10.1016/j.nuclphysa.2007.01.016

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The Gamow-Teller transition strengths in pf-shell nuclei are important parameters in a presupernova model. A high resolution (³He, t) reaction was performed from T_z = + 1 nuclei (⁴²Ca, ⁴⁶Ti, ⁵⁰Cr and ⁵⁴Fe) to T_z = 0 nuclei (⁴²Sc, ⁴⁶V, ⁵⁰Mn and ⁵⁴Co) at an incident energy of 140 MeV/nucleon and at 0°for the precise study of GT transition strengths B(GT). To derive B(GT) values for these pf-shell nuclei, the R² value, the ratio between the GT and Fermi unit cross sections, was introduced. The R² values were studied for various mass nuclei by using the B(GT) values from β-decay studies as standard, and the mass dependence was derived. It was found that GT strengths in these four pf-shell nuclei move to higher excitation energies as the mass number A increases. The obtained GT strength distributions were compared with shell model calculations.

DOI： 10.1016/j.nuclphysa.2007.01.050

記述言語：その他   掲載種別：研究論文（学術雑誌）  

The Gamow-Teller transition strengths in pf-shell nuclei are important parameters in a presupernova model. A high resolution (3He, t) reaction was performed from Tz = + 1 nuclei (42Ca, 46Ti, 50Cr and 54Fe) to Tz = 0 nuclei (42Sc, 46V, 50Mn and 54Co) at an incident energy of 140 MeV/nucleon and at 0°for the precise study of GT transition strengths B(GT). To derive B(GT) values for these pf-shell nuclei, the R2 value, the ratio between the GT and Fermi unit cross sections, was introduced. The R2 values were studied for various mass nuclei by using the B(GT) values from β-decay studies as standard, and the mass dependence was derived. It was found that GT strengths in these four pf-shell nuclei move to higher excitation energies as the mass number A increases. The obtained GT strength distributions were compared with shell model calculations. © 2007.

DOI： 10.1016/j.nuclphysa.2007.01.050

記述言語：その他  

Determination of the Gamow-Teller transition strength to In-116(g.s.) by the Cd-116(p,n) reaction at 300 MeV for the study of the nuclear matrix element of the two-neutrino double beta decay

DOI： 10.1016/j.nuclphysa.2007.01.051

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cluster structures of the excited states in ¹¹B are studied by analyzing the isoscalar monopole and quadrupole strengths in the ¹¹B (d, d^′) reaction at E_d = 200   MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. The large monopole strength for the 3 / 2₃^- state at E_x = 8.56   MeV is well described by the AMD calculation and is suggested to be an evidence for a well developed 2 α + t cluster structure.

DOI： 10.1016/j.physletb.2006.11.079

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The 12C((d) over right arrow, alpha)B-10*[2(+)] reaction at 0 degrees has been proposed as a new tool to calibrate the deuteron beam polarization at intermediate energies. The absolute values of the deuteron polarizations were extracted for the first time by using this reaction at 270 and 140 MeV deuteron energies. The analyzing powers for the (d) over right arrow -p elastic scattering, which is used as a secondary reaction of a polarimetry, were determined by the new method. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2006.11.040

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The ¹²C(over(d, ⇒), α)¹⁰B ^*[2⁺] reaction at 0^{{ring operator}} has been proposed as a new tool to calibrate the deuteron beam polarization at intermediate energies. The absolute values of the deuteron polarizations were extracted for the first time by using this reaction at 270 and 140 MeV deuteron energies. The analyzing powers for the over(d, ⇒)-p elastic scattering, which is used as a secondary reaction of a polarimetry, were determined by the new method.

DOI： 10.1016/j.nima.2006.11.040

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A solenoid magnet using high-temperature superconductor tape was designed, fabricated, and tested for its suitability as beam scanner. After successful cooling tests, the magnet performance was studied using DC and AC currents. With DC current the magnet was successfully operated as mirror coils for a 2.45 GHz ECR ion source. The coils could be operated at 100 A and frequencies above 1 Hz. The installation of iron pole pieces and return yokes, enabled us to generate fields in excess of 2 T at 197 A DC. In AC mode this magnet can be operated in the ranges of 0.14-1.73 and 1.22-1.67 T at frequencies of 0.05 and 0.25 Hz, respectively.

DOI： 10.1016/j.nima.2006.10.294

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report measurements of the cross section and a complete set of polarization observables for the Si-28((p) over right arrow, (n) over right arrow) P-28(6(-)) reaction at a bombarding energy of 198 MeV. The data are compared with distorted wave impulse approximation calculations employing response functions normalized to inelastic electron scattering. The spin-longitudinal polarized cross section IDq is slightly over-predicted by the calculations, while the normal spin-transverse polarized cross section IDn is significantly under-predicted. The calculated in-plane spin-transverse IDp and spin-scalar ID0 polarized cross sections agree well with the experimental data. These results are consistent with those for Si-28((p) over right arrow, (p) over right arrow') Si-28(6(-), T = 1) scattering at the same energy, and thus it is concluded that isospin-mixing effects are not responsible for the discrepancy between theory and experiment in the ((p) over right arrow, (p) over right arrow') case. Energy half-off-shell effects as medium effects on the effective nucleon-nucleon interaction are also investigated and found to be too small to be responsible for the discrepancy. (c) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physletb.2006.12.069

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A solenoid magnet using high-temperature superconductor tape was designed, fabricated, and tested for its suitability as beam scanner. After successful cooling tests, the magnet performance was studied using DC and AC Currents. With DC current the magnet was successfully operated as mirror coils for a 2.45 GHz ECR ion source. The coils could be operated at 100 A and frequencies above I Hz., The installation of iron pole pieces and return yokes, enabled us to generate fields in excess of 2 T at 197 A DC. In AC mode this magnet c an be operated in the ranges of 0.14-1.73 and 1.22-1.67 T at frequencies of 0.05 and 0.25 Hz, respectively. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2006.10.294

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report measurements of the cross section and a complete set of polarization observables for the ²⁸Si (over(p, →), over(n, →)) ²⁸P (6^-) reaction at a bombarding energy of 198 MeV. The data are compared with distorted wave impulse approximation calculations employing response functions normalized to inelastic electron scattering. The spin-longitudinal polarized cross section I D_q is slightly over-predicted by the calculations, while the normal spin-transverse polarized cross section I D_n is significantly under-predicted. The calculated in-plane spin-transverse I D_p and spin-scalar I D₀ polarized cross sections agree well with the experimental data. These results are consistent with those for ²⁸Si (over(p, →), over(p, →)^′) ²⁸Si (6^-, T = 1) scattering at the same energy, and thus it is concluded that isospin-mixing effects are not responsible for the discrepancy between theory and experiment in the (over(p, →), over(p, →)^′) case. Energy half-off-shell effects as medium effects on the effective nucleon-nucleon interaction are also investigated and found to be too small to be responsible for the discrepancy.

DOI： 10.1016/j.physletb.2006.12.069

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Fifty years after its prediction, the highest-lying [2 0 2]3/2 orbit among the six Nilsson single-particle orbits originating from the sd shell in prolately deformed nuclei and the rotational band on this orbit were identified. The band members were observed in ²⁵Al at excitation energies of 6-7.5MeV in a high-resolution ²⁵Mg(³He, t) charge-exchange reaction at 0° having a strong selectivity for Gamow-Teller transitions. In comparison with the analogous M1 transitions in ²⁵Mg, the J ^π=3/2⁺ band-head state and the excited 5/2⁺ and 7/2⁺ members were clearly assigned.

DOI： 10.1088/0031-8949/2006/T125/047

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cluster structures of the excited states in ¹¹B are studied by analyzing the isoscalar monopole and quadrupole strengths in the ¹¹B(d,d′) reaction at E_d = 200 MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3/2₃^- state at E _x = 8.56 MeV is well described by the AMD calculation and is an evidence for a developed 2α + t cluster structure.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cluster structures of the excited states in B-11 are studied by analyzing the isoscalar monopole and quadrupole strengths in the B-11(d,d') reaction at E-d = 200 MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3/2(3)(-) state at E-alpha = 8.56 MeV is well described by the AMD calculation and is an evidence for a developed 2 alpha + t cluster structure.

DOI： 10.1142/S021773230602202X

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cluster structures of the excited states in ¹¹B are studied by analyzing the isoscalar monopole and quadrupole strengths in the ¹¹B(d, d′) reaction at E_d 200 MeV. The excitation strengths are compared with the theoretical predictions by the antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3/2^-₃ state at E_x 8.56 MeV is well described by the AMD wave function with a dilute 2α + tcluster structure.

DOI： 10.1088/1742-6596/49/1/052

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Recent progress in the study of spin-isospin responses by charge exchange (p,n) and (n,p) reactions at 300-500 MeV is reviewed with special emphases on quenching of the total Gamow-Teller (GT) strength at a momentum transfer q=0fm-1 and enhancement of the spin-longitudinal (pionic) response in quasielastic scattering (QES) at q≈1.7fm-1. This progress has been made possible by the development of experimental techniques such as polarization transfer measurements for (p,n) reactions and quasi-monochromatic neutron beam production for (n,p) measurements. Currently operating (p→,n→) and (n,p) facilities are described. We present a detailed method of multipole decomposition analysis to extract GT strengths from the continuum spectra of the Zr90(p,n) and (n,p) reactions. From the obtained GT strength distributions, a quenching factor Q with respect to the GT sum rule value of 3(N-Z) can be derived. We also describe a method to obtain the polarized cross section IDi for the QES region from a complete set of polarization transfer coefficients Dij for the (p→,n→) reaction. The peak position of the GT giant resonance, the quenching factor Q, and the spin-longitudinal cross section IDq are used to estimate the values for the Landau-Migdal parameters, giving gNN′=0.6-0.7 and gNΔ′=0.2-0.4, which are appropriate for the wide range q≈0-1.7fm-1. This small gNΔ′ value leads to a large increase in pionic attraction in a large momentum transfer region. One possible consequence of this is a reduction of the critical density of pion condensation, which is briefly touched upon. Another consequence is precursor phenomena of pion condensation in the normal nuclear density which appear in the enhancement of IDq. Basic theoretical elements, including the Δ isobar degrees of freedom for analyzing experimental data, are described. Treatments of the continuum in reactions as well as in nuclear structure are emphasized. The framework of the distorted wave impulse approximation as well as two-step processes using the response functions in the continuum random phase approximation is described.

DOI： 10.1016/j.ppnp.2005.09.001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The fine structure of the Gamow-Teller resonance in a medium-heavy nucleus is observed for the first time in a high-resolution Zr90(He3,t)Nb90 experiment at the Research Center for Nuclear Physics, Osaka. Using a novel wavelet analysis technique, it is possible to extract characteristic energy scales and to quantify their relative importance for the generation of the fine structure. This method combined with the selectivity of the reaction permits an extraction of the level density of 1+ states in Nb90.

DOI： 10.1103/PhysRevLett.96.012502

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Study of the pionic enhancement in 16O(p,p')16O(0-, T=1) at 295 MeV

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cross section of the O16(p,p′)O16(0-,T=1) scattering was measured at a bombarding energy of 295 MeV in the momentum transfer range of 1.0fm-1≤qc.m.≤2.1fm-1. The isovector 0- state at Ex=12.8MeV is clearly separated from its neighboring states owing to the high energy resolution of about 30 keV. The cross section data were compared with distorted wave impulse approximation (DWIA) calculations employing shell-model wave functions. The observed cross sections around qc.m.≃1.7fm-1 are significantly larger than obtained by these calculations, suggesting pionic enhancement as a precursor of pion condensation in nuclei. The data are well reproduced by DWIA calculations using random phase approximation response functions including the Δ isobar that predict pionic enhancement.

DOI： 10.1016/j.physletb.2005.11.009

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Supernarrow dibaryons (SNDs) have been searched for by the pd→ppX and pd→pdX reactions at Ep=295 MeV over a mass range of 1898 to 1953 MeV, where three candidates of SNDs were found at the Moscow Meson Factory. The experiment was carried out at the Research Center for Nuclear Physics using a two-arm magnetic spectrometer system and a liquid deuterium target. A good mass resolution of 1 MeV and a low background condition were achieved. No resonance structure was observed in the missing mass spectra. Upper limits of the SND production cross section were determined.

DOI： 10.1103/PhysRevC.74.035203

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The Gamow-Teller (GT) transition strengths in fp-shell nuclei are important parameters in presupernova models. A high-energy-resolution (He3,t) experiment was performed on the Tz=1 nucleus Ti46 at 0° and at an intermediate incident energy of 140 MeV/nucleon for the study of precise GT transition strengths to the final Tz=0 nucleus V46. With an energy resolution of 33 keV, individual GT transitions were observed and GT strengths were derived for them up to the excitation energy of 4.5 MeV. The GT strengths were compared with shell-model calculations using various effective interactions. In this low-lying region, most GT states have isospin T=0. A few GT states with isospin T=1 were identified from the existence of the corresponding (analog) M1 states in Ti46. By comparing the GT strength with the corresponding (analogous) M1 transition strength studied in Ti46(e,e') or (γ,γ') measurements, a large constructive interference of orbital and spin terms was suggested for one of these M1 transitions.

DOI： 10.1103/PhysRevC.73.024311

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The response functions of 25.4 cm (length) × 25.4 cm (diameter) NE213 organic liquid scintillator have been measured for neutrons in the energy range from 20 to 800 MeV at the Heavy-Ion Medical Accelerator in Chiba (HIMAC) and at the Research Center for Nuclear Physics (RCNP) of Osaka University. At HIMAC, white (continuous) energy spectrum neutrons were produced by the 400 MeV per nucleon carbon ion bombardment on a thick graphite target, whose energy spectrum has already been measured by Kurosawa et al., [Nucl. Sci. Eng. 132, 30 (1999)] and the response functions of the time-of-flight-gated monoenergetic neutrons in a wide energy range from 20 to 800 MeV were simultaneously measured. At RCNP, the quasi-monoenergetic neutrons were produced via
⁷
Li(p,n)
⁷
Be reaction by 250 MeV proton beam bombardment on a thin
⁷
Li target, and the TOF-gated 245 MeV peak neutrons were measured. The absolute peak neutron yield was obtained by the measurement of 478 keV gamma rays from the
⁷
Be nuclei produced in a Li target. The measured results show that the response functions for monoenergetic neutrons <250 MeV have a recoil proton plateau and an edge around the maximum light output, which increases with increasing incident neutron energy, on the other hand >250 MeV, the plateau and the edge become unclear because the proton range becomes longer than the detector size and the escaping protons increase. It can be found that the efficiency of the 24.5 cm (diameter) × 25.4 cm (length) NE213 for the 250 MeV neutrons is ∼10 times larger than the 12.7 cm (length) × 12.7 cm (diameter) NE213, which is widely used as a neutron spectrometer.

DOI： 10.1093/rpd/nci042

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The response functions of 25.4 cm (length) x 25.4 cm (diameter) NE213 organic liquid scintillator have been measured for neutrons in the energy range from 20 to 800 MeV at the Heavy-Ion Medical Accelerator in Chiba (HIMAC) and at the Research Center for Nuclear Physics (RCNP) of Osaka University. At HIMAC, white (continuous) energy spectrum neutrons were produced by the 400 MeV per nucleon carbon ion bombardment on a thick graphite target, whose energy spectrum has already been measured by Kurosawa et al., [Nucl. Sci. Eng. 132, 30 (1999)] and the response functions of the time-of-flight-gated monoenergetic neutrons in a wide energy range from 20 to 800 MeV were simultaneously measured. At RCNP, the quasi-monoenergetic neutrons were produced via Li-7(p,n)Be-7 reaction by 250 MeV proton beam bombardment on a thin Li-7 target, and the TOF-gated 245 MeV peak neutrons were measured. The absolute peak neutron yield was obtained by the measurement of 478 keV gamma rays from the Be-7 nuclei produced in a Li target. The measured results show that the response functions for monoenergetic neutrons < 250 MeV have a recoil proton plateau and an edge around the maximum light output, which increases with increasing incident neutron energy, on the other hand > 250 MeV, the plateau and the edge become unclear because the proton range becomes longer than the detector size and the escaping protons increase. It can be found that the efficiency of the 24.5 cm (diameter) x 25.4 cm (length) NE213 for the 250 MeV neutrons is similar to 10 times larger than the 12.7 cm (length) x 12.7 cm (diameter) NE213, which is widely used as a neutron spectrometer.

DOI： 10.1093/rpd/nci042

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We investigate the Gamow-Teller (GT) response functions at a momentum transfer of q=0fm-1 and the pionic response functions for quasielastic scattering (QES) at q 1.7fm-1 using the continuum random phase approximation with the π+ρ+g' model interaction. The Landau-Migdal (LM) parameters, gNN' and gNΔ', are estimated by comparing the calculations with recent experimental data. The peak of the GT resonance and the pionic response functions below the QES peak constrain gNN', whereas the quenching of the GT total strength and the enhanced pionic strength around the QES peak provide information about gNΔ'. We obtained gNN'=0.6±0.1 and gNΔ'=0.35±0.16 at q=0fm-1 and gNN'=0.7±0.1 and gNΔ'=0.3±0.1 at q 1.7fm-1. These results indicate that the q dependence of the LM parameters is weak.

DOI： 10.1103/PhysRevC.72.067303

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Three precise measurements for elastic pd scattering at 135MeV/A have been performed with the three different experimental setups. The cross sections are described well by the theoretical predictions based on modern nucleon-nucleon forces combined with three-nucleon forces. Relativistic Faddeev calculations show that relativistic effects are restricted to backward angles. This result supports the two measurements recently reported by RIKEN and contradicts the KVI data.

DOI： 10.1103/PhysRevLett.95.162301

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We describe the neutron polarimeter NPOL3 for the measurement of polarization transfer observables Dij with a typical high resolution of ∼300 keV at Tn≃200MeV. The NPOL3 system consists of three planes of neutron detectors. The first two planes for neutron polarization analysis are made of 20 sets of one-dimensional position-sensitive plastic scintillation counters with a size of 100 cm × 10 cm × 5 cm, and they cover the area of 100×100cm2. The last plane for detecting doubly scattered neutrons or recoiled protons is made of the two-dimensional position-sensitive liquid scintillation counter with a size of 100cm×100cm×10cm. The effective analyzing powers Ay;eff and double scattering efficiencies εD.S. were measured by using the three kinds of polarized neutrons from the 2H(p→,n→)pp, 6Li(p→,n→)6Be(g.s.), and 12C(p→,n→) 12N(g.s.) reactions at Tp=198MeV. The performance of NPOL3 defined as εD.S.(Ay;eff)2 are similar to that of the Indiana Neutron POLarimeter by taking into account for the counter configuration difference between these two neutron polarimeters.

DOI： 10.1016/j.nima.2005.03.151

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Double differential cross sections between 0°-12°were measured for the ⁹⁰Zr(n, p) reaction at 293 MeV over a wide excitation energy range of 0-70 MeV. A multipole decomposition technique was applied to the present data as well as the previously obtained ⁹⁰Zr(p, n) data to extract the Gamow-Teller (GT) component from the continuum. The GT quenching factor Q was derived by using the obtained total GT strengths. The result is Q=0.88±0.06, not including an overall normalization uncertainty in the GT unit cross section of 16%.

DOI： 10.1016/j.physletb.2005.04.032

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

DOI： 10.1063/1.1932874

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Analyzing powers for exclusive 1s1/2 proton knockout from light nuclei

DOI： 10.1103/PhysRevC.72.041602

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Analyzing power data are reported for exclusive proton-induced proton knockout from the 1s1/2 states of 10 target nuclei ranging from H2 to F19 for an incident energy of 392 MeV. Compared to free proton-proton scattering, the data are significantly suppressed, the amount of suppression increasing monotonically as a function of increasing separation energies for the knocked-out protons. It is also possible to consider that this suppression increases monotonically as a function of the increasing effective mean density for most of the target nuclei, but data for He3 and He4 targets clearly deviate from such systematic change. The data are compared to model predictions based on the nonrelativistic and relativistic distorted-wave impulse approximation. Both relativistic plane wave model and a nonrelativistic distorted-wave model incorporating a relativistic correction associated with an effective nucleon mass predict a significant suppression of the analyzing power, but the magnitude of the suppression is not sufficient to explain the experimental data. However, a relativistic distorted wave model predicts values that are closer to the data, but the result is inconclusive in this work since recoil corrections are neglected.

DOI： 10.1103/PhysRevC.72.041602

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We report our experimental studies on (p, 2p) reactions from two kinds of view points, namely to investigate single particle properties of nuclei and to observe possible modification of NN interactions in nuclear field. Comparison of the cross section data with theoretical predictions and data of (e, e′p) reaction suggests that the reaction mechanizsm at incident energies of around 400 MeV is simple enough to extract spectroscopic information through the (p, 2p) reactions. In addition, some analyzing power data show anomaly which is not seen in cross section data and, therefore, which suggest importance of polarization studies. On the examination of the NN interaction, systematic study on analyzing powers for 1s_1/2-proton knockout has been continued. A new systematics, a Q-value dependence the analyzing power was newly observed.

DOI： 10.1088/1742-6596/20/1/017

記述言語：英語  

Both the Gamow-Teller (GT) and the pionic response functions are investigated in the same framework of the continuum random phase approximation with the π ρ + g′ model interaction. The Landau-Migdal (LM) parameters, g′_NN and g′_NΔ, are estimated by comparing these calculations with recent experimental data. The peak of the GT resonance and the pionic response functions below the quasielastic scattering (QES) peak constrain g′_NN, whereas the quenching of the GT total strength and the enhanced pionic strength around the QES peak provide information about g′_NΔ. We obtain a common set of the LM parameters, g′_NN = 0.6-0.7 and g′_NΔ = 0.2-0.4, which reproduce the peak and quenching of the GT strengths as well as the enhancement of the pionic modes. The g′_NΔ value is significantly smaller than g′_NN, which means that the universality ansatz, g′_NN = g′_NΔ, should not be valid.

DOI： 10.1088/1742-6596/20/1/004

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The Gamow-Teller (GT) unit cross section, σ̌_GT, is an essential quantity to deduce the GT transition strength, B(GT), from the (p, n) 0°cross section. (p, n) measurements at 200 and 300 MeV were performed using the Neutron Time-of-Flight (NTOF) facility at the Research Center for Nuclear Physics (RCNP). The σ̌_GT values were determined, for the first time, for several nuclei in the region of A > 50 at E _p = 200 and 300 MeV. A significant difference between the B(GT) values obtained by (p, n) and (³He, t) measurements was found.

DOI： 10.1088/1742-6596/20/1/036

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Under the assumption that isospin I is a good quantum number, isobaric analog states and various analogous transitions are expected in isobars with mass number A. The strengths of T_z=+3/2→+1/2 analogous Gamow-Teller (GT) transitions and analogous M1 transitions within the A=41 isobar quartet are compared in detail. The T_z= +3/2+1/2 GT transitions from the J^π=3/2⁺ ground state of ⁴¹K leading to excited J^π = 1/2⁺, 3/2 ⁺, and 5/2⁺ states in ⁴¹Ca were measured using the (³He,t) charge-exchange reaction. With a high energy resolution of 35 keV, many fragmented states were observed, and the GT strength distribution was determined up to 10 MeV excitation energy (E_x). The main part of the strength was concentrated in the E_x =4-6 MeV region. A shell-model calculation could reproduce the concentration, but not so well details of the strength distribution. The obtained distribution was further compared with two results of ⁴¹Ti βdecay studying the analogous T^z=-3/2→-1/2 GT strengths. They reported contradicting distributions. One-to-one correspondences of analogous transitions and analog states were assigned up to E_x=6 MeV in the comparison with one of these ⁴¹Ti β-decay results. Combining the spectroscopic information of the analog states in ⁴¹Ca and ⁴¹ Sc, the most probable J^π values were deduced for each pair of analog states. It was found that 5/2⁺ states carry the main part of the observed GT strength, while much less GT strength was carried by 1/2⁺ and 3/2⁺ states. The gross features of the GT strength distributions for each J were similar for the isospin analogous T_z=±3/ 2→±1/2 transitions, but the details were somewhat different. From the difference of the distributions, isospin-asymmetry matrix elements of ≈8 keV were deduced. The Coulomb displacement energy, which is sensitive to the configuration of states, showed a sudden increase of about 50 keV at the excitation energy of 3.8 MeV. The strengths of several Ml transitions to the IAS in ⁴¹Ca were compared with the strengths of analogous GT transitions. It was found that ratios of the M1 and GT transition strengths were similar, suggesting that the contributions of the lτ term in M1 transitions are small.

DOI： 10.1103/PhysRevC.70.054311

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Weak-interaction responses of ¹¹B were studied by measuring the ¹¹B(³He, t) and ¹¹B(p, p′) reactions. Obtained nuclear transition matrix elements B(GT), B(στ), and B(σ) were compared with the shell-model calculations. The shell-model calculations, which explained the isovector parts B(GT) and B(στ) reasonably well if the quenching factors of 0.5-0.7 were taken into account, did not describe the isoscalar part B(σ).

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Weak-interaction responses of11B were studied by measuring the11B(3He, t) and11B(p, p′) reactions. Obtained nuclear transition matrix elements B(GT), B(στ), and B(σ) were compared with the shell-model calculations. The shell-model calculations, which explained the isovector parts B(GT) and B(στ) reasonably well if the quenching factors of 0.5-0.7 were taken into account, did not describe the isoscalar part B(σ). © 2004 MAIK "Nauka/Interperiodica".

DOI： 10.1134/1.1811180

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A complete set of polarization transfer observables has been measured for the ⁹⁰Zr(p, n) reaction at T_p = 295 MeV and θ_lab = 0^{inverted c sign}. The measurement can yield the total spin transfer Σ(0^{inverted c sign}) which is independent of nuclear reaction mechanisms such as the effective nucleon-nucleon interaction or distortions. The deduced Σ(0^{inverted c sign}) values indicate the strong spin-flip characteristics of the continuum up to 50 MeV excitation. A predominance of unnatural-parity transitions in the continuum is also observed from polarization transfer observables.

DOI： 10.1143/JPSJ.73.1611

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A complete set of polarization transfer observables has been measured for the Zr-90(p,n) reaction at T-p = 295 MeV and theta(lab) = 0degrees. The measurement can yield the total spin transfer Sigma(0degrees) which is independent of nuclear reaction mechanisms such as the effective nucleon-nucleon interaction or distortions. The deduced Sigma(0degrees) values indicate the strong spin-flip characteristics of the continuum up to 50 MeV excitation. A predominance of unnatural-parity transitions in the continuum is also observed from polarization transfer observables.

DOI： 10.1143/JPSJ.73.1611

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The deuteron-to-proton polarization-transfer coefficients for d-p elastic scattering were precisely measured with an incoming deuteron energy of 135 MeV/nucleon at the RIKEN Accelerator Research Facility. The data are compared to theoretical predictions based on exact solution's of the three-nucleon Faddeev equations with high-precision nucleon-nucleon forces combined with the current, most popular three-nucleon force (3NF) models: the 2pi-exchange Tucson-Melbourne model, a modification thereof based on chiral symmetry, TM'(99), and the Urbana IX 3NF. Theory predicts large 3NF effects, especially in the angular range around the cross sect. ion minimum, predominantly for K-xx(y')-K-yy(y')(K-xx(y'),K-yy(y')), but the present data only partially concurs with the calculations. For the induced polarization, P-y', the TM'(99) and Urbana IX 3NFs reproduce the data, but the Tucson-Melbourne 3NF fails to describe the data. For the polarization-transfer coefficients, K-y(y') and K-xz(y'), the predicted 3NF effects are in drastic disagreement with the data. These facts clearly reveal the defects of the 3NF models currently used.

DOI： 10.1103/PhysRevC.70.014001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Differential cross sections and a complete set of polarization observables have been measured for quasielastic ((p) over right arrow,(n) over right arrow) reactions on C-12 and Ca-40 at a bombarding energy of 345 MeV. The laboratory momentum transfers are q(lab) similar or equal to 1.2, 1.7, and 2.0 fm(-1) for C-12 and q(lab) 1.7 fm(-1) for Ca-40. In these momentum transfer regions, the isovector spin-longitudinal interaction is attractive where the one-pion exchange is dominant. The spin-longitudinal and spin-transverse polarized cross sections, IDq and IDp, are deduced. The theoretically expected enhancement in the spin-longitudinal mode is observed at q(lab) similar or equal to 1.7 and 2.0 fm(-1). The observed IDq is consistent with the pionic enhanced IDq evaluated in distorted wave impulse approximation (DWIA) calculations employing random phase approximation (RPA) response functions. The enhanced IDq implies the existence of a precursor to pion condensation in nuclei. On the other hand, the theoretically predicted quenching in the spin-transverse mode is not observed. The observed IDp is not quenched, but rather enhanced relative to that predicted via the DWIA+RPA calculations. Two-step contributions are responsible in part for the enhancement of IDp.

DOI： 10.1103/PhysRevC.69.054609

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Differential cross sections and a complete set of polarization observables have been measured in the quasielastic ²H(p,n) reaction at a bombarding energy of 345 MeV and laboratory scattering angles of 16°, 22°, and 27°. The data are compared with plane-wave impulse approximation calculations employing an optimal factorization approximation. The agreement between the experimental and theoretical results validates these approximations in the present momentum- and energy-transfer regions. The experimental spin-longitudinal and spin-transverse response functions, R _L and R_T, respectively, are deduced from the data. The obtained R_T is consistent with that obtained from the quasielastic electron scattering. The theoretical calculations with the Reid soft core potential give good descriptions for R_L and R_T, whereas the latter is slightly underestimated around the quasielastic peak.

DOI： 10.1103/PhysRevC.69.044602

記述言語：その他  

Thin self-supporting targets are indispensable in high energy-resolution studies using a magnetic spectrometer. However, nuclear targets of alkaline and alkaline-earth metal or halogen isotopes are not easily available. In order to produce thin target foils of these elements for the use in charge-exchange reactions, we take advantage of the fact that the stable isotopes of these elements have relatively small negative Q values, while12C and16O have large negative Q values. Therefore, even if organic compounds containing carbon and oxygen are used as supporting material, clean spectra on alkaline and alkaline-earth metal or halogen targets can be obtained up to the excitation energies of Q-value differences. A technique to produce thin foils of the chemical compounds Na2CO3,K2CO3,CaCO3and CaCl2was developed using polyvinylalcohol as supporting material. Foils with a total thickness of 1-2 mg/cm2were produced and used as targets in a (3He,t) reaction study at an incident energy of 420 MeV. Owing to the small contributions of energy-loss differences of beam and reaction products in such thin targets, a very good resolution of ΔE/E=7×10-5was achieved in combination with a high-resolution magnetic spectrometer. © 2003 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2003.12.002

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Differential cross sections and a complete set of polarization observables have been measured in the quasielastic H-2(p,n) reaction at a bombarding energy of 345 MeV and laboratory scattering angles of 16degrees, 22degrees, and 27degrees. The data are compared with plane-wave impulse approximation calculations employing an optimal factorization approximation. The agreement between the experimental and theoretical results validates these approximations in the present momentum- and energy-transfer regions. The experimental spin-longitudinal and spin-transverse response functions, R-L and R-T, respectively, are deduced from the data. The obtained R-T is consistent with that obtained from the quasielastic electron scattering. The theoretical calculations with the Reid soft core potential give good descriptions for R-L and R-T, whereas the latter is slightly underestimated around the quasielastic peak.

DOI： 10.1103/PhysRevC.69.044602

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Thin self-supporting targets are indispensable in high energy-resolution studies using a magnetic spectrometer. However, nuclear targets of alkaline and alkaline-earth metal or halogen isotopes are not easily available. In order to produce thin target foils of these elements for the use in charge-exchange reactions, we take advantage of the fact that the stable isotopes of these elements have relatively small negative Q values, while ¹²C and ¹⁶O have large negative Q values. Therefore, even if organic compounds containing carbon and oxygen are used as supporting material, clean spectra on alkaline and alkaline-earth metal or halogen targets can be obtained up to the excitation energies of Q-value differences. A technique to produce thin foils of the chemical compounds Na₂CO₃,K ₂CO₃,CaCO₃ and CaCl₂ was developed using polyvinylalcohol as supporting material. Foils with a total thickness of 1-2 mg/cm² were produced and used as targets in a (³He,t) reaction study at an incident energy of 420 MeV. Owing to the small contributions of energy-loss differences of beam and reaction products in such thin targets, a very good resolution of ΔE/E=7×10^-5 was achieved in combination with a high-resolution magnetic spectrometer.

DOI： 10.1016/j.nima.2003.12.002

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The existence of highest-lying [2 0 2]3/2 orbit among the six Nilsson particle orbits in prolately deformed nuclie was identified along with the rotational band on this orbit. The band members were investigated in ²⁵Al at excitation energies of 6-7.5 MeV in a high resolution ²⁵Mg(³He,t) charge exchange reaction. The comparison of excitation energies with the analogous M1 transitions in ²⁵Mg depicted that the bandhead and the excited members are clearly assigned. The results showed that the bandhead state of the orbit was observed at E _x = 6.117 Mev in ²⁵Al by the charge-exchange reaction.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Polarization for proton knockout reactions from s1/2 orbits at 1 GeV

DOI： 10.1103/PhysRevC.69.024604

記述言語：英語  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The mirror nuclei ²⁵Mg and ²⁵Al are expected to have very similar structures. The Gamow-Teller (GT) transitions from the J ^π = 5/2⁺ ground state of ²⁵Mg to the excited states in ²⁵Al were studied by high-resolution measurements of the ²⁵Mg(³He, t) charge-exchange reaction at 0 ^° and at 140 MeV/nucleon. Assuming the usual ΔJ ^π = 1⁺ selection rule for the spin-isospin-type GT transitions, the states with J^π = 3/2⁺, 5/2 ⁺, and 7/2⁺ should be excited. However, of the more than ten states with these J^π values below 6 MeV excitation energy, only the 5/2⁺ ground state and the 7/2⁺, 1.613 MeV state in ²⁵Al were strongly populated, while all other states were strongly suppressed. The analysis of Ml transitions in ²⁵Mg also suggested a very similar feature for the analogous M1 transitions. Both ²⁵Mg and ²⁵Al are known to be largely deformed, and most low-lying states can be interpreted in terms of one-particle quantum numbers in the deformed potential and the associated rotational spectra. The observed suppression can be explained in terms of the K quantum number selection rules that are inherent to axially deformed nuclei.

DOI： 10.1140/epja/i2003-10115-2

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The polarization of protons emitted in [Formula Presented] reactions has been measured for three kinds of targets at [Formula Presented]. The values of the polarization that we obtain are significantly smaller than the values predicted using the nucleon-nucleon (NN) interaction in free space, and the discrepancy between the two is seen to increase monotonically as a function of the effective mean density, which is defined as a measure of the sensitivity of a reaction to density-dependent terms of the interaction. The experimental data are also compared with a model calculation that includes a relativistic effect, and it is found that inclusion of this effect is able to account for about half of the density-dependent discrepancy between the experimental results and the values predicted with the free space NN interaction. These results, in conjunction with the previous results at [Formula Presented], indicate that this discrepancy is not caused by a contribution of multistep processes and provide further evidence that there exists a medium effect.

DOI： 10.1103/PhysRevC.69.024604

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The polarization of protons emitted in (p,2p) reactions has been measured for three kinds of targets at 1 GeV. The values of the polarization that we obtain are significantly smaller than the values predicted using the nucleon-nucleon (NN) interaction in free space, and the discrepancy between the two is seen to increase monotonically as a function of the effective mean density, which is defined as a measure of the sensitivity of a reaction to density-dependent terms of the interaction. The experimental data are also compared with a model calculation that includes a relativistic effect, and it is found that inclusion of this effect is able to account for about half of the density-dependent discrepancy between the experimental results and the values predicted with the free space NN interaction. These results, in conjunction with the previous results at 392 MeV, indicate that this discrepancy is not caused by a contribution of multistep processes and provide further evidence that there exists a medium effect.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The deuteron-to-proton polarization-transfer coefficients for d-p elastic scattering were precisely measured with an incoming deuteron energy of 135 MeV/nucleon at the RIKEN Accelerator Research Facility. The data are compared to theoretical predictions based on exact solutions of the three-nucleon Faddeev equations with high-precision nucleon-nucleon forces combined with the current, most popular three-nucleon force (3NF) models: the 2π-exchange Tucson-Melbourne model, a modification thereof based on chiral symmetry, TM'(99), and the Urbana IX 3NF. Theory predicts large 3NF effects, especially in the angular range around the cross section minimum, predominantly for K
_xx
^y′
-K
_yy
^y′
(K
_xx
^y′
,K
_yy
^y′
), but the present data only partially concurs with the calculations. For the induced polarization, P
^y′
, the TM′(99) and Urbana IX 3NFs reproduce the data, but the Tucson-Melbourne 3NF fails to describe the data. For the polarization-transfer coefficients, K
_y
^y′
and K
_xz
^y′
, the predicted 3NF effects are in drastic disagreement with the data. These facts clearly reveal the defects of the 3NF models currently used.

DOI： 10.1103/PhysRevC.70.014001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Differential cross sections and a complete set of polarization observables have been measured for quasielastic (p^→,n^→) reactions on ¹²C and ⁴⁰Ca at a bombarding energy of 345 MeV. The laboratory momentum transfers are q_lab ≃ 1.2, 1.7, and 2.0 fm^-1 for ¹²C and q_lab≃ 1.7 fm ^-1 for ⁴⁰Ca. In these momentum transfer regions, the isovector spin-longitudinal interaction is attractive where the one-pion exchange is dominant. The spin-longitudinal and spin-transverse polarized cross sections, ID_q and ID_p, are deduced. The theoretically expected enhancement in the spin-longitudinal mode is observed at q _lab≃1.7 and 2.0 fm^-1. The observed ID_q is consistent with the pionic enhanced ID_q evaluated in distorted wave impulse approximation (DWIA) calculations employing random phase approximation (RPA) response functions. The enhanced ID_q implies the existence of a precursor to pion condensation in nuclei. On the other hand, the theoretically predicted quenching in the spin-transverse mode is not observed. The observed ID_p is not quenched, but rather enhanced relative to that predicted via the DWIA+RPA calculations. Two-step contributions are responsible in part for the enhancement of ID_p.

DOI： 10.1103/PhysRevC.69.054609

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The ¹¹B(³He,t), and ¹¹B(d,d′), and ¹¹B(p,p′) reactions were measured at forward scattering angles including 0° to study the isovector and isoscalar spin-flip M1 strengths in ¹¹B. The measured ¹¹B(³He,t) cross sections were compared with the results of the distorted-wave impulse-approximation (DWIA) calculation, and the Gamow-Teller (GT) strengths for low-lying states in ¹¹C were determined. The GT strengths were converted to the isovector spin-flip M1 strengths using the isobaric analog relations under the assumption of the isospin symmetry. The isoscalar spin-flip M1 strengths were obtained from the (d,d′) analysis by assuming that the shape of the collective transition form factor with the same ΔJ^π is similar in the ¹¹B(d,d′) and ¹²C(d,d′) reactions. The obtained isovector and isoscalar strengths were used in the DWIA calculations for the ¹¹B(p,p′) reaction. The DWIA calculation reasonably well explains the present ¹¹B(p,p′) result. However, the calculated cross section for the 8.92-MeV 3/2₂^-, state was significantly smaller than the experimental values. The transition strengths obtained in the shell-model calculations were found to be 20-50 % larger than the experimental strengths. The transition strengths for the neutrino induced reactions were estimated by using the isovector and isoscalar spin-flip Ml strengths. The present results are quantitatively in agreement with the theoretical estimation discussing the axial isoscalar coupling in the neutrino scattering process, and are useful in the measurement of the stellar neutrinos using the neutral- and charged-current reactions on ¹¹B.

DOI： 10.1103/PhysRevC.70.034318

記述言語：英語   掲載種別：研究論文（学術雑誌）  

After 50 years of its prediction, the highest-lying [Formula presented] orbit among the six Nilsson single-particle orbits originating from the [Formula presented] shells in prolately deformed nuclei and the rotational band on this orbit were identified. The band members were observed in [Formula presented] at excitation energies of 6–7.5 MeV in a high-resolution [Formula presented] charge-exchange reaction at [Formula presented] having a strong selectivity for Gamow-Teller transitions. In the comparison with the analogous [Formula presented] transitions in [Formula presented], the [Formula presented] bandhead state and the excited [Formula presented] and [Formula presented] members were clearly assigned.

DOI： 10.1103/PhysRevLett.92.062502

記述言語：英語   掲載種別：研究論文（学術雑誌）  

pd scattering at 250 MeV and three-nucleon forces

DOI： 10.1140/epja/i2002-10219-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have measured angular distributions of the differential cross-section, the analyzingpower and all of the spin transfer coefficients K-y(y'), K-x(x'), K-z(x'), K-x(z'), and K-z(z') for the pd elastic scattering at 250 MeV. These are the first measurements of a complete set of proton polarization observables for pd elastic scattering at intermediate energies. The present data are compared with theoretical predictions based on exact solutions of the three-nucleon Faddeev equations and modern realistic nucleon-nucleon potentials combined with three-nucleon forces (3NF), namely the Tucson-Melbourne (TM) 2pi-exchange model, a modification thereof (TM') closer to chiral symmetry, and the Urbana IX model.

DOI： 10.1140/epja/i2002-10219-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Motivated by the need of spectroscopic data to better understand the astrophysical rp-process, we developed a new experimental method using the Grand Raiden magnet spectrometer to study proton rich nuclei with α and ³He induced reactions. First results of the ²⁴Mg(⁴He,⁶He)²²Mg reaction at 206 MeV and O° are presented, showing states relevant for resonant reaction rate calculations of the proton capture ²¹Na(p,γ)²²Mg and the ¹⁸Ne(α,p)²¹ Na reaction which controls the break-out of the hot CNO cycles at X-ray burst conditions.

DOI： 10.1016/S0375-9474(03)00900-X

記述言語：その他  

The effective analyzing power for a 3He polarimeter was calibrated at E3He = 443 MeV. For the calibration, the absolute magnitude of the polarization was determined by means of the double scattering method using the 3He scattering on 12C at 7° in the laboratory frame. The effective analyzing power of Ayeff = 0.232±0.010-0.015+0.017 was obtained for the polarimeter with a plastic scintillator of 16 mm thickness as analyzer. The energy dependence of Ayeff was measured. The first data of the induced polarization for 3He+12C elastic scattering at E3He = 443 MeV will be presented. © 2003 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0168-9002(03)01436-0

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross section and induced polarization in He-3 elastic scattering at 443 MeV

DOI： 10.1103/PhysRevC.67.064612

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Dibaryons which have a very narrow decay width, called super-narrow dibaryons, are searched for by the p+d scattering at E-p = 295 MeV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A good mass resolution of 0.95 MeV and background free condition have been achieved. No resonance has been observed in the mass region of 1896-1914 MeV. The upper limits of the dibaryon production, cross section have been determined.

DOI： 10.1016/S0375-9474(03)01137-0

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Precise measurements of the deuteron to proton polarization transfer coefficients for the d-p elastic scattering has been made at 135 MeV/u at RIKEN Accelerator Research Facility. The obtained results are compared with the Faddeev calculations based on modern nucleon-nucleon forces together with Tucson-Melbourne, Tucson-Melbourne' and Urbana Argonne type of three nucleon forces.

DOI： 10.1016/S0375-9474(03)01141-2

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Dibaryons which have a very narrow decay width, called super-narrow dibaryons, are searched for by the p+d scattering at E_p = 295 MeV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A good mass resolution of 0.95 MeV and background free condition have been achieved. No resonance has been observed in the mass region of 1896-1914 MeV. The upper limits of the dibaryon production cross section have been determined.

DOI： 10.1016/S0375-9474(03)01137-0

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Precise measurements of the deuteron to proton polarization transfer coefficients for the d-p elastic scattering has been made at 135 MeV/u at RIKEN Accelerator Research Facility. The obtained results are compared with the Faddeev calculations based on modern nucleon-nucleon forces together with Tucson-Melbourne, Tucson-Melbourne' and Urbana-Argonne type of three nucleon forces.

DOI： 10.1016/S0375-9474(03)01141-2

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Search for narrow dibaryon resonances by the pd -> pdX and pd -> ppX reactions

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Polarization transfer measurement for d-p scattering and three nucleon force effects

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

New capabilities of the Grand Raiden spectrometer

DOI： 10.1016/S0375-9474(03)01294-6

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Resonance states in Mg-22 for reaction rates in the rp-process

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross section and induced polarization in 3He elastic scattering at 413 MeV
Angular distributions of the differential cross section and the induced polarization of He-3 elastic scattering on C-12, Ni-58, and Zr-90 targets were measured at 443 MeV incident energy. This is the first measurement of 3He spin observables at intermediate energies. Cross sections and polarizations were measured in the range of center-of-mass angles of 5degrees- 30degrees and 5degrees- 20degrees, respectively. The polarization was measured with the focal plane polarimeter system of the Grand Raiden spectrometer, which was calibrated for He-3 at the present energy. The optical potential parameters including the spin-orbit term were determined by a systematic search procedure. The diffuseness parameter of the spin-orbit potential was about 0.6 - 0.8 fm in contrast to much smaller values of 0.2 - 0.3 fm reported at lower energies. The energy dependence of the reduced volume integrals of the optical potential was found to be similar to that observed for protons at intermediate energies, but the real potential terms were smaller. Single folding (SF) model calculations were performed and compared with the experimental data. We found that the renormalization factors used to modify the SF potential were necessary in order to obtain a good fit to the data. These results call for an appropriate density dependent nucleon-nucleus interaction in the He-3 nucleus.

DOI： 10.1103/PhysRevC.67.064612

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Measurement of p+d elastic scattering at E-p=392 MeV

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The angular distributions of the cross section, the proton analyzing power and all of proton polarization transfer coefficients of (p) over right arrowd elastic scattering were measured at 250 MeV. The present data are compared with theoretical. predictions based on exact solutions of the three-nucleon Faddeev equations and modern realistic nucleon-nucleon potentials combined with three-nucleon forces. These results call for a better understanding of the spin structure of the three-nucleon force and very likely for a full relativistic treatment of the three-nucleon continuum.

DOI： 10.1142/S0217732303010417

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross section and analyzing powers of pd --> He-3+gamma reaction were measured at E-d = 200 MeV. Low background data were obtained by using a liquid hydrogen target and by detecting He-3. The cross section and A(y) are well reproduced by a Faddeev calculation with a 3-nucleon force included, however, A(yy) deviates from the calculation and A(xx) is completely different from the calculation.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Dibaryons which have a very narrow decay width, called super-narrow dibaryons, are searched for by the p+d scattering at E-p = 295 MeV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A good mass resolution of 0.95 MeV and background free condition have been achieved. No resonance has been observed in the mass region of 1896-1914 MeV. The upper limits of the dibaryon production cross section have been determined.

DOI： 10.1142/S0217732303010582

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Precise measurements of the deuteron to proton polarization transfer coefficients for the d-p elastic scattering have been made at 135 MeV/u at RIKEN Accelerator Research Facility. The obtained results are compared with the Faddeev calculations based on modern nucleon-nucleon forces together with Tucson-Melbourne, Tucson-Melbourne' and Urbana-Argonne type of three nucleon forces.

DOI： 10.1142/S0217732303010442

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cross sections and spin observables of the p+d elastic scattering have been measured at 392 MeV. The results are compared with the results of Faddeev calculations with and without including the three nucleon force.

DOI： 10.1142/S0217732303010648

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Dibaryons which have a very narrow decay width, called super-narrow dibaryons, are searched for by the p+d scattering at Ep = 295 MeV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A good mass resolution of 0.95 MeV and background free condition have been achieved. No resonance has been observed in the mass region of 1896-1914 MeV. The upper limits of the dibaryon production cross section have been determined.

DOI： 10.1142/S0217732303010582

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Precise measurements of the deuteron to proton polarization transfer coefficients for the d-p elastic scattering have been made at 135 MeV/u at RIKEN Accelerator Research Facility. The obtained results are compared with the Faddeev calculations based on modern nucleon-nucleon forces together with Tucson-Melbourne, Tucson-Melbourne and Urbana-Argonne type of three nucleon forces.

DOI： 10.1142/S0217732303010442

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The cross sections and spin observables of the p+d elastic scattering have been measured at 392 MeV. The results are compared with the results of Faddeev calculations with and without including the three nucleon force.

DOI： 10.1142/S0217732303010648

記述言語：英語  

To study the three-nucleon force (3NF) effects without ambiguities from the Coulomb effect, the differential cross sections and the vector analyzing powers for the n
^→
d elastic scattering at E
_n
= 245 MeV have been measured at θ
_cm
= 85° - 180°. The data are compared to the results of Faddeev calculations using modern nucleon-nucleon (NN) forces with and without 3NF. Additionally we have a plan to extend our measurement to the forward angular region where the Coulomb effect is expected to be large. We carried out the test experiment and measured the differential cross sections at θ
_cm
= 21°.

DOI： 10.1142/S0217732303010387

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Three-body effects in (p)over-right-arrowd elastic scattering at 250 MeV

DOI： 10.1142/S0217732303010417

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Tensor anomaly in pd radiative capture

DOI： 10.1142/S0217732303010430

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Search for super-narrow dibaryon resonances by the pd -> pdX and pd -> ppX reactions

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Polarization transfer measurement for d-p elastic scattering: to search for three nucleon force effects

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Angular distributions of the differential cross section and the induced polarization of ³He elastic scattering on ¹²C, ⁵⁸Ni, and ⁹⁰Zr targets were measured at 443 MeV incident energy. This is the first measurement of ³He spin observables at intermediate energies. Cross sections and polarizations were measured in the range of center-of-mass angles of 5°-30° and 5°-20°, respectively. The polarization was measured with the focal plane polarimeter system of the Grand Raiden spectrometer, which was calibrated for ³He at the present energy. The optical potential parameters including the spin-orbit term were determined by a systematic search procedure. The diffuseness parameter of the spin-orbit potential was about 0.6-0.8 fm in contrast to much smaller values of 0.2-0.3 fm reported at lower energies. The energy dependence of the reduced volume integrals of the optical potential was found to be similar to that observed for protons at intermediate energies, but the real potential terms were smaller. Single folding (SF) model calculations were performed and compared with the experimental data. We found that the renormalization factors used to modify the SF potential were necessary in order to obtain a good fit to the data. These results call for an appropriate density dependent nucleon-nucleus interaction in the ³He nucleus.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Three body dN interaction in the analysis of the C-12((d)over-right-arrow, d ') reaction at 270 MeV

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have measured the cross sections and analyzing powers A,, and A for the elastic and inelastic scattering of deuterons Yy from the 0(+) (g.s.), 2(+)(4.44 MeV), 3(-) (9.64 MeV), 1(+) (12.71 MeV), and 2(-) (18.3 MeV) states in C-12 at an incident energy of 270 MeV. The data are compared with microscopic distorted-wave impulse approximation calculations where the projectilenucleon effective interaction is taken from the three-nucleon t-matrix given by rigorous Faddeev calculations presently available at intermediate energies. The agreement between theory and data compares well with that for the (p, p') reactions at comparable incident energies/nucleon. (C) 2002 Elsevier Science B.V. All rights reserved.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have measured the cross sections and analyzing powers Ay and Ayy for the elastic and inelastic scattering of deuterons from the 0⁺(g.s.), 2⁺(4.44 MeV), 3^-(9.64 MeV), 1⁺(12.71 MeV), and 2^-(18.3 MeV) states in ¹²C at an incident energy of 270 MeV. The data are compared with microscopic distorted-wave impulse approximation calculations where the projectile-nucleon effective interaction is taken from the three-nucleon t-matrix given by rigorous Faddeev calculations presently available at intermediate energies. The agreement between theory and data compares well with that for the (p, p′) reactions at comparable incident energies/nucleon.

DOI： 10.1016/S0370-2693(02)02957-X

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross section and complete set of proton spin observables in (p)over-right-arrow-d elastic scattering at 250 MeV

DOI： 10.1103/PhysRevC.66.044002

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have designed and constructed a new control system for the two-arm spectrometers and West-South (WS) beam line at RCNP. The system controls not only the magnets of the spectrometers but also movable devices such as slits. All the instruments are controlled by the system through a local area network. For the dipole magnets of the spectrometers, a high-performance feedback system based on a proportional-integral-differential algorithm was implemented. We have succeeded to change and stabilize the magnetic fields within ±0.05 mT in about 5 min and within about ±0.02 mT after 10 min. The performance of the feedback system satisfies the requirement for the high-resolution experiments with the Grand Raiden spectrometer by using the dispersive beam from the WS beam line.

DOI： 10.1016/S0168-9002(02)00899-9

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have designed and constructed a new control system for the two-arm spectrometers and West-South (WS) beam line at RCNP, The system controls not only the magnets of the spectrometers but also movable devices such as slits. All the instruments are controlled by the system through a local area network. For the dipole magnets of the spectrometers, a high-performance feedback system based on a proportional-integral-differential algorithm was implemented. We have succeeded to change and stabilize the magnetic fields within +/- 0.05 mT in about 5 min and within about +/- 0.02 mT after 10 min. The performance of the feedback system satisfies the requirement for the high-resolution experiments with the Grand Raiden spectrometer by using the dispersive beam from the WS beam line. (C) 2002 Elsevier Science B.V. All rights reserved.

記述言語：英語  

Cross Sections and polarization transfer observables in the ¹⁶O(p,p′) reactions at 392 MeV were measured at several angles between θ_lab =0° and 14°. The non-spin-flip (ΔS = 0) and spin-flip (ΔS = 1) strengths in transitions to several discrete States and broad resonances in ¹⁶O were extracted using a model-independent method. The giant resonances in the energy region of E_x = 19-27 MeV were found to be predominantly excited by ΔL = 1 transitions. The strength distribution of spin-dipole transitions with ΔS = 1 and ΔL = 1 were deduced. The obtained distribution was compared with a recent shell model calculation. Experimental results are reasonably explained by distorted-wave impulse-approximation calculations with the shell model wave functions.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

He-3(d, p)He-4 reaction at intermediate energies and impulse picture of the (d, p) reactions

記述言語：その他   掲載種別：研究論文（学術雑誌）  

The analyzing powers of π+ and π- were measured using an incident 22-GeV/c transversely polarized proton beam at the Brookhaven Alternating Gradient Synchrotron. A magnetic spectrometer measured π± inclusive asymmetries on a hydrogen and a carbon target. An elastic polarimeter with a CH2 target measured pp elastic-scattering asymmetries to determine the beam polarization using published data for the pp elastic analyzing power. Using the beam polarization determined from the elastic polarimeter and asymmetries from the inclusive spectrometer, analyzing powers AN for π± were determined in the xF and PT ranges (0.45-0.8) and (0.3-1.2 GeV/c), respectively. The analyzing power results are similar in both sign and character to other measurements at 200 and 11.7 GeV/c, confirming the expectation that high-energy pion inclusive analyzing powers remain large and relatively energy independent. This suggests that pion inclusive polarimetry may be a suitable method for measuring future beam polarizations at BNL RHIC or DESY HERA. Analyzing powers of π+ and π- produced on hydrogen and carbon targets are the same. Various models to explain inclusive analyzing powers are also discussed.

DOI： 10.1103/PhysRevD.65.092008

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross section, tensor analyzing power T₂₀, and vector polarization correlation coefficient C_y,_y for the ³He(d, p)⁴He reaction have been measured at 0° and E_d = 140, 200, and 270 MeV. The data are compared with a calculation based on an impulse approximation taking the D-state admixtures in deuteron, ³He, and ⁴He explicitly into account. The reasonable agreement with the data is understood as a consequence of a close connection between the ³He(d, p)⁴He reaction and the d + N backward scattering.

DOI： 10.1016/S0370-2693(02)01565-4

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Measurement of analyzing powers of pi(+) and pi(-) produced on a hydrogen and a carbon target with a 22-GeV/c incident polarized proton beam

記述言語：英語   掲載種別：研究論文（学術雑誌）  

High resolution beam line for the Grand Raiden spectrometer

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Nucleon-nucleon decoupled dibaryons below the pion emission threshold have been investigated by the pd-->pdX and pd-->ppX reactions at E-p=300 MeV. Such dibaryons are predicted to either decay into a deuteron or two nucleons by emitting a gamma ray and consequently have a very narrow width of less than 1 keV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A mass resolution of 0.95 MeV and background-free condition have been achieved. No resonance was found in either the d + gamma or p + n + gamma decay channels within the mass region of 1896-1914 MeV. Upper limits for the dibaryon production cross section are presented.

DOI： 10.1103/PhysRevC.65.047001

記述言語：その他  

We have designed and constructed a new beam line which can accomplish both lateral and angular dispersion matching with the Grand Raiden spectrometer. In dispersive mode, lateral and angular dispersions of the beam line are b16= 37.1 m and b26= -20.0 rad, respectively, to satisfy matching conditions for Grand Raiden. In achromatic mode, the beam line satisfies the double achromatic condition of b16= b26= 0. The magnifications of the beam line are (Mx, My) = (-0.98, 0.89) and (-1.00, -0.99) for dispersive and achromatic modes, respectively. In the commissioning experiments, we have succeeded to separate the first excited 2+state of168Er with Ex= 79.8 keV clearly from the ground state in the (p, p′) reaction. We achieved energy resolutions of ΔE = 13.0 ± 0.3 and 16.7 ± 0.3 keV in full width at half-maximum for 295 and 392 MeV protons, respectively. These energy resolutions agree with the resolving power of Grand Raiden for an object size of about 1 mm. © 2002 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0168-9002(01)01686-2

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Nucleon-nucleon decoupled dibaryons below the pion emission threshold have been investigated by the pd→pdX and pd→ppX reactions at E_p - 300 MeV. Such dibaryons are predicted to either decay into a deuteron or two nucleons by emitting a γ ray and consequently have a very narrow width of less than 1 keV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A mass resolution of 0.95 MeV and background-free condition have been achieved. No resonance was found in either the d + γ or p + n + γ decay channels within the mass region of 1896-1914 MeV. Upper limits for the dibaryon production cross section are presented.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have designed and constructed a new beam line which can accomplish both lateral and angular dispersion matching with the Grand Raiden spectrometer. In dispersive mode, lateral and angular dispersions of the beam line are b₁₆ = 37.1 m and b₂₆ = -20.0 rad, respectively, to satisfy matching conditions for Grand Raiden. In achromatic mode, the beam line satisfies the double achromatic condition of b₁₆ = b₂₆ = 0. The magnifications of the beam line are (M_x, M_y) = (-0.98, 0.89) and (-1.00, -0.99) for dispersive and achromatic modes, respectively. In the commissioning experiments, we have succeeded to separate the first excited 2⁺ state of ¹⁶⁸Er with E_x = 79.8 keV clearly from the ground state in the (p, p′) reaction. We achieved energy resolutions of ΔE = 13.0 ± 0.3 and 16.7 ± 0.3 keV in full width at half-maximum for 295 and 392 MeV protons, respectively. These energy resolutions agree with the resolving power of Grand Raiden for an object size of about 1 mm.

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Study of nuclear medium effects on polarization in (p, 2p) scattering at 1 GeV

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Complete set of precise deuteron analyzing powers at intermediate energies: Comparison with modern nuclear force predictions

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The double-differential cross sections and analyzing powers over an angular range of 30degrees less than or equal to theta(lab) less than or equal to 75degrees, and the induced polarizations P and polarization transfer values D-NN at 30degrees and 40degrees for the Ca-40(p, n) reaction are measured at a bombarding energy of 345 MeV. The data are compared with theoretical calculations in a semiclassical distorted wave (SCDW) model employing through three- and two-step contributions for cross sections and polarization observables, respectively. At forward angles, the SCDW calculations reproduce the observed cross sections fairly well around the quasielastic peak. The one-step contribution is dominant at theta(lab) = 30degrees, while the two- and three-step contributions become more important with increasing reaction angle. At backward angles the calculations underestimate the cross sections in the whole region, which indicates the significance of higher-step contributions. The D-NN values, which are sensitive to the effective nucleon-nucleon interaction in the nuclear medium, are close to those calculated with the G-matrix interaction parametrized by the Melbourne group.

DOI： 10.1103/PhysRevC.65.034615

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Precise measurements of deuteron vector and tensor analyzing powers A(y)(d), A(xx), A(yy), and A(xz) in d-p elastic scattering were performed via H-1((d) over bar ,d) p and H-1((d) over right arrow ,p)d reactions at three incoming deuteron energies of E-d(lab) = 140, 200, and 270 MeV. A wide range of center-of-mass angles from approximate to10degrees to 180degrees was covered. The cross section was measured at 140 and 270 MeV at the same angles. These high precision data were compared with theoretical predictions based on exact solutions of three-nucleon Faddeev equations and modern nucleon-nucleon potentials combined with three-nucleon forces. Three-body interactions representing a wide range of present day models have been used: the Tucson-Melbourne 2pi-exchange model, a modification thereof closer to chiral symmetry, the Urbana IX model, and a phenomenological spin-orbit ansatz. Large three-nucleon force effects are predicted, especially at the two higher energies. However, only some of them, predominantly dsigma/dOmega and A(y)(d), are supported by the present data. For tensor analyzing powers the predicted effects are in drastic conflict to the data, indicating defects of the present day three-nucleon force models.

DOI： 10.1103/PhysRevC.65.034003

記述言語：英語   掲載種別：研究論文（学術雑誌）  

3He(d, p)4He Reaction at Intermediate Energies and Impulse Picture of the (d, p) Reactions

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Precise measurements of deuteron vector and tensor analyzing powers A_y^d, A_xx, A_yy, and A_xz in d-p elastic scattering were performed via ¹H(d^→,d)p and ¹H(d^→,p)d reactions at three incoming deuteron energies of E_d^lab = 140, 200, and 270 MeV. A wide range of center-of-mass angles from ≈ 10° to 180° was covered. The cross section was measured at 140 and 270 MeV at the same angles. These high precision data were compared with theoretical predictions based on exact solutions of three-nucleon Faddeev equations and modern nucleon-nucleon potentials combined with three-nucleon forces. Three-body interactions representing a wide range of present day models have been used: the Tucson-Melbourne 2 π-exchange model, a modification thereof closer to chiral symmetry, the Urbana IX model, and a phenomenological spin-orbit ansatz. Large three-nucleon force effects are predicted, especially at the two higher energies. However, only some of them, predominantly dσ/dΩ and A_y^d, are supported by the present data. For tensor analyzing powers the predicted effects are in drastic conflict to the data, indicating defects of the present day three-nucleon force models.

DOI： 10.1103/PhysRevC.65.034003

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Cross sections and polarization observables for the Ca-40(p,n) reaction at 345 MeV and multistep contributions in the continuum

記述言語：英語   掲載種別：研究論文（学術雑誌）  

C-12,C-13(rho, pi(-)) O-13,14(g.s.) reactions in the Delta(1232) resonance region

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The role of the A resonance has been discussed for the C-12,C-13,C-14(p, pi(-))O-13,14,15(g.s). reactions both experimentally and theoretically. Recent calculations suggested resonance effects, in the energy dependence of the differential cross section that seem to contradict existing data. Since the available data points are limited, it is important to measure the energy dependence of the differential cross section,, and the analyzing powers in order to better understand the still unclear reaction mechanism of the ground state (p, pi(-)) reactions. In the present paper, angular distributions of the differential cross sections and the analyzing powers were measured for C-12,C-13(p,pi(+/-)) reactions at incident energies of 250, 300, and 350 MeV. Experimental results for the C-12(p, pi(-))O-13(g.s.) reaction are compared with full-range distorted-wave Born approximation calculations.

DOI： 10.1103/PhysRevC.65.014609

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The role of the Δ resonance has been discussed for the [Formula Presented] reactions both experimentally and theoretically. Recent calculations suggested resonance effects in the energy dependence of the differential cross section that seem to contradict existing data. Since the available data points are limited, it is important to measure the energy dependence of the differential cross sections and the analyzing powers in order to better understand the still unclear reaction mechanism of the ground state [Formula Presented] reactions. In the present paper, angular distributions of the differential cross sections and the analyzing powers were measured for [Formula Presented] reactions at incident energies of 250, 300, and 350 MeV. Experimental results for the [Formula Presented] reaction are compared with full-range distorted-wave Born approximation calculations.

DOI： 10.1103/PhysRevC.65.014609

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Nucleon-nucleon decoupled dibaryons below the pion emission threshold have been investigated by the [Formula Presented] and [Formula Presented] reactions at [Formula Presented] Such dibaryons are predicted to either decay into a deuteron or two nucleons by emitting a [Formula Presented] ray and consequently have a very narrow width of less than 1 keV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A mass resolution of 0.95 MeV and background-free condition have been achieved. No resonance was found in either the [Formula Presented] or [Formula Presented] decay channels within the mass region of 1896–1914 MeV. Upper limits for the dibaryon production cross section are presented.

DOI： 10.1103/PhysRevC.65.047001

記述言語：英語  

Cross sections and polarization transfer observables in the [Formula Presented] reactions at 392 MeV were measured at several angles between [Formula Presented] and 14°. The non-spin-flip [Formula Presented] and spin-flip [Formula Presented] strengths in transitions to several discrete states and broad resonances in [Formula Presented] were extracted using a model-independent method. The giant resonances in the energy region of [Formula Presented] were found to be predominantly excited by [Formula Presented] transitions. The strength distribution of spin-dipole transitions with [Formula Presented] and [Formula Presented] were deduced. The obtained distribution was compared with a recent shell model calculation. Experimental results are reasonably explained by distorted-wave impulse-approximation calculations with the shell model wave functions.

DOI： 10.1103/PhysRevC.65.064316

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The analyzing powers of (Formula presented) and (Formula presented) were measured using an incident (Formula presented) transversely polarized proton beam at the Brookhaven Alternating Gradient Synchrotron. A magnetic spectrometer measured (Formula presented) inclusive asymmetries on a hydrogen and a carbon target. An elastic polarimeter with a (Formula presented) target measured pp elastic-scattering asymmetries to determine the beam polarization using published data for the pp elastic analyzing power. Using the beam polarization determined from the elastic polarimeter and asymmetries from the inclusive spectrometer, analyzing powers (Formula presented) for (Formula presented) were determined in the (Formula presented) and (Formula presented) ranges (Formula presented) and (Formula presented) respectively. The analyzing power results are similar in both sign and character to other measurements at 200 and (Formula presented) confirming the expectation that high-energy pion inclusive analyzing powers remain large and relatively energy independent. This suggests that pion inclusive polarimetry may be a suitable method for measuring future beam polarizations at BNL RHIC or DESY HERA. Analyzing powers of (Formula presented) and (Formula presented) produced on hydrogen and carbon targets are the same. Various models to explain inclusive analyzing powers are also discussed.

DOI： 10.1103/PhysRevD.65.092008

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The double-differential cross sections and analyzing powers over an angular range of 30° ≤ θ_lab ≤ 75°, and the induced polarizations P and polarization transfer values D_NN at 30° and 40° for the ⁴⁰Ca(p,n) reaction are measured at a bombarding energy of 345 MeV. The data are compared with theoretical calculations in a semiclassical distorted wave (SCDW) model employing through three- and two-step contributions for cross sections and polarization observables, respectively. At forward angles, the SCDW calculations reproduce the observed cross sections fairly well around the quasielastic peak. The one-step contribution is dominant at θ_lab = 30°, while the two- and three-step contributions become more important with increasing reaction angle. At backward angles the calculations underestimate the cross sections in the whole region, which indicates the significance of higher-step contributions. The D_NN values, which are sensitive to the effective nucleon-nucleon interaction in the nuclear medium, are close to those calculated with the G-matrix interaction parametrized by the Melbourne group.

DOI： 10.1103/PhysRevC.65.034615

記述言語：英語  

The role of the Δ resonance has been discussed for the ^12,13,14C(p, π^-)^13,14,15O_g.s. reactions both experimentally and theoretically. Recent calculations suggested resonance effects in the energy dependence of the differential cross section that seem to contradict existing data. Since the available data points are limited, it is important to measure the energy dependence of the differential cross sections and the analyzing powers in order to better understand the still unclear reaction mechanism of the ground state (p, π^-) reactions. In the present paper, angular distributions of the differential cross sections and the analyzing powers were measured for ^12,13C(p, π^±) reactions at incident energies of 250, 300, and 350 MeV. Experimental results for the ¹²C(p, π^-)¹³O_g.s. reaction are compared with full-range distorted-wave Born approximation calculations.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Measurement of single and double spin-flip probabilities in inelastic deuteron scattering on C-12 at 270 MeV

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The deuteron single and double spin-flip probabilities, S-1 and S-2, have been measured for the C-12((d) over right arrow; (d) over right arrow') reaction at E-d = 270 MeV for an excitation energy range, between 4 and 24 MeV and a scattering angular range between Theta (lab) = 2.5 degrees and 7.5 degrees. The extracted S-1 exhibits characteristic values depending on the structure of the excited state. The S-2 is close to zero over the measured excitation energy range. The SFP angular distribution data for the 2(+) (4.44 MeV) and 1(+) (12.71 MeV) states are well described by the microscopic DWIA calculations. (C) 2001 Elsevier Science BN. All rights reserved.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The deuteron single and double spin-flip probabilities, S₁ and S₂, have been measured for the ¹²C(d̄;d̄′) reaction at E_d = 270 MeV for an excitation energy range between 4 and 24 MeV and a scattering angular range between Θlab = 2.5° and 7.5°. The extracted S₁ exhibits characteristic values depending on the structure of the excited state. The S₂ is close to zero over the measured excitation energy range. The SFP angular distribution data for the 2⁺ (4.44 MeV) and 1⁺ (12.71 MeV) states are well described by the microscopic DWIA calculations.

DOI： 10.1016/S0370-2693(01)01202-3

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A neutron beam dump experiment has been carried out using the accelerator beam at RCNP, Osaka University. Neutrons with energies T-n = 100-400 MeV were allowed to bombard a carbon target (density 1.8 g/cm(3)) which had a thickness varying from 0 to 300 cm, and the attenuation of the neutrons was measured in the range from 0 to 540 g/cm(2), The experimental data were well reproduced by the Monte Carlo calculation by the Shibata model. Using these results, the attenuation of neutrons in the Earth's atmosphere was obtained by means of a simulation. The results are useful not only for cosmic ray experiments but also for radiation protection experiments since the target does not contain hydrogen. (C) 2001 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0168-9002(01)00289-3, 10.1016/s0168-9002(01)00289-3

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Precise data on cross sections, analyzing powers and polarization transfer coefficients are measured for the dp elastic scattering at 270 MeV (135 MeV/nucleon) and compared to Faddeev calculations assuming the nd scattering with modern nucleon-nucleon (NN) forces including the 2π exchange Tucson-Melbourne (TM) three-nucleon (3N) force. Excellent fits are obtained for the cross sections and vector analyzing powers when the 3N force is included, while the fits are deteriorated for the tensor analyzing powers if the 3N force is included. A moderate fit is obtained for the polarization transfer coefficients. Based on theses results, one can conclude that the size of amplitudes of the TM-SN force may be adequate but the spin dependent part may be deficient. The cross sections and the vector analyzing powers for the nd elastic scattering at 250 MeV are measured for the first time. Backward cross sections are underestimated by the NN+3N force Faddeev calculations. This difference might be attributed to relativistic effects.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Precise data on cross sections, analyzing powers and polarization transfer coefficients are measured for the dp elastic scattering at 270 MeV (135 MeV/nucleon) and compared to Faddeev calculations assuming the 72d scattering with modern nucleon-nucleon (NN) forces including the 2 pi exchange Tucson-Melbourne (TM) three-nucleon (3N) force. Excellent fits are obtained for the cross sections and vector analyzing powers when the 3N force is included, while the fits are deteriorated for the tenser analyzing powers if the 3N force is included. A moderate fit is obtained for the polarization transfer coefficients. Based on theses results, one can conclude that the size of;amplitudes of the TM-3N force may be adequate but the spin dependent part may be deficient.
The cross sections and the vector analyzing powers for the nd elastic scattering at 250 MeV are measured for the first time. Backward cross sections are underestimated by the NN+3N force Faddeev calculations. This difference might be attributed to relativistic effects.