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Study of the fast-neutron-induced breakup reactions on lithium isotopes.

锂同位素快中子诱导裂解反应的研究。

基本信息

批准号：
62540214
负责人：
SHIRATO Shoji
金额：
$ 0.83万
依托单位：
Rikkyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62540214/
关键词：
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

项目摘要

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.

利用立教大学300 kV Cockcroft-Walton加速器提供的14.1 MeV T-d中子和两台计数望远镜，测量了快中子在^<6，7>Li上引起反应的带电粒子（氘核和氚核）的绝对微分截面和角分布。每个计数器望远镜由两个正比计数器和两个Si探测器组成（用于E和E测量）。用轧制法制备了富集95.58%^6Li和99.988%^7Li的目标金属。实验结果用扭曲波玻恩近似（DWBA）和末态相互作用（FSI）理论进行了分析。通过一个简单的FSI理论，我们在形状上再现了三体末态^6Li（n，d）^5He和^7Li（n，t）^5He的分裂反应中测得的d和t的能谱。在^7Li的情况下，发现了7/2态的t-α FSI的显著贡献以及3/2态的n-α FSI增强的峰值。DWBA计算很好地再现了这两个反应以及二体反应^6Li（n，t）^4He和^7Li（n，d）^6He的角分布的观测特征，观测到的光谱因子与壳模型预测的结果一致。