基于ENDF/B-Ⅶ的部分核素ACE格式光核截面的制作与检验

Working and Verification of ACE Libray Photonuclear Cross Section of Partial Nuclein Based on ENDF/B-Ⅶ

MCNP5程序可以用于电子加速器驱动次临界系统的建模运算,其调用的截面数据库缺乏部分核素的光核数据。利用NJOY程序将ENDF/B-Ⅶ中的7种核素原始光核数据制作成MCNP5可利用的ACE格式的光核数据,并用MCNP5建立模型计算出所加工核素的光中子反应微观截面,得到光中子反应微观截面随光子能量变化曲线,并与IAEA编写的技术文档中各核数据中心的截面曲线进行对比。结果表明,所有核素光核反应数据制作过程正确,但52Cr、58Ni和91Zr的光中子反应微观截面在不同数据库中有一定的差别。

MCNP5 program can be used to model the electronic accelerator driven sub critical system,the cross section database which used by MCNP5 that lacks photonuclear data of some radionuclides.We use the NJOY program to process seven nuclei photonuclear data from ENDFB-Ⅶ in the original photonuclear data into MCNP5 using ACE format,and use MCNP5 to build a model to calculate the photoneutron cross section,to get the curve of the photonetron cross section with the photon energy,and compare with the cross section curve of each nuclear data center.The results show that the manufacturing process of nuclide cross section is correct and most of the data processed by the nuclide are correct,but the photoneutron reaction cross sections of ^52Cr, ^58Ni and ^91Zr were different in different databases.