摘要
测量了8．17MeV与10．27MeV中子与9Be和6,7Li作用的次级中子双微分截面．对于10．27MeV,为了消除从D(d,np)破裂反应来的源破裂中子对双微分截面测量结果的影响,采用了常规多探测器快中子飞行时间谱仪和非常规多探测器快中子飞行时间谱仪相结合的办法．用Monte-Carlo方法对实验测量得到的飞行时间谱进行了详细的模拟,通过测量谱与模拟谱的比较,得到了实验测量的次级中子双微分截面．实验测量结果以n-p(常规谱仪)和n-C(非常规谱仪)弹性散射微分截面作为归一．测量结果与评价数据以及其他测量数据进行了比较．用一个基于Hauser-Feshbach和激子模型的轻核核反应理论模型对6,7Li的次级中子双微分截面进行了计算,理论计算结果与实验结果符合得较好．
The neutron emission double-differential cross sections（DDXs） of n＋^9Be and ^6,7Li were measured at incident neutron energies of 8.17 and 10.27MeV. At 10.27MeV, the influence of breakup source neutrons from D（d, np） reactions was eliminated by using the combination of abnormal and normal fast neutron TOF spectrometers. The measured TOF spectra were analyzed by detailed Monte-Carlo simulation and the DDXs were determined by comparing the measured TOF spectra with simulated ones. The cross sections were normalized to n-p（normal geometry measurement） or n-C（abnormal geometry measurement） scattering measurement. The measured results were compared with the evaluations and the other measurements. A theoretical model based on the Hauser-Feshbach and exciton model for light nuclei was used to describe the double-differential cross sections of n＋^6,7Li. Good agreement between theoretical calculation and measurement has been obtained.
出处
《高能物理与核物理》
CSCD
北大核心
2007年第5期442-447,共6页
High Energy Physics and Nuclear Physics
基金
中国核工业集团公司核数据专题基金资助~~
关键词
次级中子
双微分截面
非常规快中子飞行时间谱仪
破裂中子
secondary neutron, double differential cross section, abnormal fast neutron TOF spectrometer,breakup neutron
