摘要
快中子核反应数据，不论对反应堆的设计，还是对核反应机制和核结构的研究及其理论的发展均有着重要的意义。由于屏栅电离室的诸多特点，被用于快中子核反应截面、能谱及双微分截面的测量。作为系统研究的一部分，文章利用屏栅电离室在北京大学４．５ＭＶ静电加速器上对薄Ｃａ靶的（ｎ，α）反应进行测量，得到５ＭｅＶ和６ＭｅＶ时的４０Ｃａ（ｎ，α０）３７Ａｒ、４０Ｃａ（ｎ，α１，２）３７Ａｒ的角分布和反应截面，同时给出总截面及微分能谱。实验结果表明４０Ｃａ（ｎ，α）３７Ａｒ的角分布大致关于９０°对称，说明在此能区，复合核反应机制起主要作用。
Nuclear reaction data are very important not only for structure material of fusion reactor, but also for model theory. Gridded ionization chamber has already been used in measurements of (n,α) reaction because of its good properties. As a part of systematic investigation, in this paper, gridded ionization chamber was applied in the measurements of 40 Ca(n,α) 37 Ar reaction at neutron energy of 5MeV and 6MeV, and angular distribution, cross section and differential energy spectra were obtained for 40 Ca(n,α 0) 37 Ar reaction and 40 Ca(n,α 1,2 ) 37 Ar reaction. Angular distributions are almost symmetric about 90 degree. The results show that the reaction is mainly compound nucleus reaction mechanism in this energy range.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1999年第6期8-10,19,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金
核工业总公司核数据测量项目
关键词
反应截面
角分布
核反应
快中子
测量
gridded ionization chamber
(n,α) reaction
cross section
angular distribution
differential energy spectrum
