摘要
1 概述利用引进开发的FOURACES程序计算氢核H的散射矩阵时,计算误差比较大,而且计算速度慢,耗费机时多,为此本文编制了计算H散射矩阵的计算机程序GC-H,采用了作者早期提出的不同于常规数值计算的全解析方法,并对ENDF/B4评价核数据库中H核的数据作了适当的处理,结果提高了精度,计算时间也大为节省。
The elastic scattering fomula of a neutron with a nucleus derived from the classical dynamics is used in some programs of slowing-down matrix calculation The error arises from the formula for Hydrogen during the program execution because its mass is nearly equal to neutron's. So the special treatment is needed for the calculation of H matrices.
Based on the new method presented by this author in 1978 [2], the program GC-H composition has been completed on CYBER825 computer According to the dependence of H scattering cross section SIGMA (E) on neutron energy E in data file of US Evaluated Nuclear Data File ENDF/B-Ⅵ, all energy region (0-10.5 MeV) is devided into several sub-regions, and the In SIGMA (E) is set to be linear with In (E) in each sub-region, the difference of scattering cross section at any energy point between the treatment and ENDF/B-Ⅵ is enabled to be less than 1％.
The H matrices are now calculated on CYBER 825 at a high speed with this program and the approach of data treatment mentionedabove. For instance, the CPU time is about 4.06 secs with the code for the calculalion of 63g.H matrices (Legendre moments up to P_1), but nearly 800 secs with the program FOURACES [1] for the same case
出处
《核科学与工程》
CSCD
北大核心
1992年第1期76-80,8,共5页
Nuclear Science and Engineering
