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.

使用立教大学 300 kV Cockcroft-Walton 加速器提供的 14.1 MeV T-d 中子和两台反望远镜测量^<6,7>Li 上快中子诱发反应的带电粒子（氘核和氚核）的绝对微分截面和角分布。每个计数器望远镜都由两个正比计数器和两个硅探测器（用于 E 和 E 测量）组成。通过轧制制备了富集95.58%^6Li和99.988%^7Li金属的靶材。 ^<6,7>Li靶材的厚度分别为3.70 0.14和3.90 0.06 mg/cm^2。通过畸变波生近似（DWBA）和终态相互作用（FSI）对获得的实验数据进行分析理论。三体最终态 ^6Li(n,d)^5He 和 ^7Li(n,t)^5He 的分解反应测得的 d 和 t 能谱通过简单的 FSI 理论在形状上再现。在 ^7Li 的情况下，发现 7/2 态 t-alpha FSI 的贡献显着，以及 3/2 态 n-alpha 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 的观察到的角分布特征，并且观察到的光谱因子为与壳模型预测一致。