| Project/Area Number |
62540214
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | Rikkyo University |
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Principal Investigator |
SHIRATO Shoji (1988) Department of Physics, Rikkyo University, Professor, 理学部, 教授 (90062562)
白土 しょう二 (1987) 立教大学, 理学部, 教授
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| Co-Investigator(Kenkyū-buntansha) |
石部 幽香子 立教大学, 理学部, 実験職員
安藤 嘉章 立教大学, 理学部, 実験職員
ANDO Yoshiaki Department of Physics, Rikkyo University, Assistant
ISHIBE Yukako Department of Physics, Rikkyo University, Assistant
本林 透 立教大学, 理学部, 助教授 (50142097)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1988: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Nuclear reaction / Neutron-induced reaction / Nuclear experiment / Fast neutron / Lithium isotopes / Break-up reaction / Cross section / Differential cross section / Nuclear data / Distorted wave Born approximation / 終状態相互作用 / 分光学的因子 |
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| Research Abstract |
Absolute differential cross sections and angular distributions of charged particles (deuterons and tritons) for fast neutron induced reactions on ^<6,7>Li were measured using 14.1 MeV T-d neutrons provided by the Rikkyo University 300 kV Cockcroft-Walton accelerator and two counter telescopes. Each of the counter telescopes consisted of two has proportional counters and two Si detectors (for the E and E measurements). The tragets of 95.58% enriched ^6Li and 99.988% ^7Li metal were prepared by rolling. The thicknesses of the ^<6,7>Li targets are 3.70 0.14 and 3.90 0.06 mg/cm^2, respectively.
The experimental data obtained were analyzed by the distorted wave born approximation (DWBA) and the final-state interaction (FSI) theories. The measured energy spectra of d and t from the break-up reactions of the three-body finalstate ^6Li(n,d)^5He and ^7Li(n,t)^5He were reproduced in shape by a simple FSI theory. In the case of ^7Li, a contribution from the 7/2 state t-alpha FSI was found remarkably as well as a peak of the 3/2 state n-alpha FSI enhancement. The observed features of angular distributions for these two reactions as well as the two-body reactions ^6Li(n,t)^4He and ^7Li(n,d)^6He were fairly reproduced by DWBA calculations, and the observed spectroscopic factors were consistent with shell-model predictions.
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