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根据热能点的实验和评价数据,利用半经验方法,给出了热中子诱发235U裂变产生的激发能在两个裂片碎片中的分配方式(图1)。利用热能点的激发能分配方式和中子诱发235U裂变碎片质量分布的系统学参数,计算了(n,f)裂变道其他能点激发能分配方式。利用上述结果对热中子、3MeV和5MeV中子诱发235U裂变产生的瞬发中子数随碎片质量分布υ(A)进行了研究(图2),并用υ(A)分布对平均瞬发中子数υ进行了检验(图3)。计算结果给出了与实验符合的热能点的υ(A)分布以及与ENDF/B-Ⅶ库符合的平均瞬发中子数υ。
According to the experiment and evaluation data of thermal energy point, the distribution of excitation energy generated by thermal neutron induced 235U fission in two fragment fragments is given by semi-empirical method (Fig. 1). Using the distribution of excitation energy of the thermal energy point and the systematic parameters of the mass distribution of 235U fission fragments induced by neutron, the distribution of excitation energy of other energy points of (n, f) fission track was calculated. Using the above results, the instantaneous neutron numbers induced by the 235U fission induced by the neutrons, 3MeV and 5MeV neutrons were studied with the mass distribution υ (A) of the fragments (Fig. 2). The mean ν (A) The number of children υ was tested (Figure 3). The calculation gives the υ (A) distribution of the thermal energy points fitted to the experiment and the average number of instant neutrons υ accorded with the ENDF / B-Ⅶ library.