14MeV中子（n,^3He）反应截面的系统学计算

Calculation of the systematics for the (n,~3He) reaction cross sections at 14 MeV

对14MeV中子的(n,~3He)反应截面的系统学特性作了研究,并得列了反应截面随不对称参数(N—Z)/A的增加而缓慢下降的趋势.在对实验数据分析、评价和拟合的基础上给出了一套经验参数.利用导出的系统学经验公式计算了一些核素的(n,~3He)反应截面,与实验结果比较符合较好.最后讨论了(n,~3He)反应的机制.

The systematic characteristic features of the (n,~3He) reaction cross sections have been studied at 14 MeV. Some systematic trends in the cross sections have been observed. A set of the empirical parameters have been extracted on the basis of an analysising and fitting available data. The (n,~3He) cross sections of some nuclei have been calculated by derived empirical formula, and a good agreement with the experimental data has been obtained. Most possible reaction mechanisms are discussed for the (n,~3He) reaction in medium and heavy mass nucleus ranges.