快速在线处理中子核截面的修正多普勒展宽方法  

Fast Online Processing of Neutron Cross-Section by an Amendatory Doppler Broadening Method

作　　者：朱金辉[1,2] 谢红刚[1,2] 牛胜利[1,2] 左应红 

机构地区：[1]西北核技术研究所,西安710024 [2]强脉冲辐射环境模拟与效应国家重点实验室,西安710024

出　　处：《现代应用物理》2015年第3期163-167,共5页Modern Applied Physics

摘　　要：在模拟计算高温系统中子输运问题时,为了快速在线处理中子核截面,基于多普勒展宽原理,发展了一种修正多普勒展宽方法。通过在低能区引入低能截面修正因子、调整计算方法及合理设置数值积分计算参数等,进行了数值算法优化,探讨了NJOY程序对高能区中子截面展宽的限制及影响,在自主开发的蒙特卡罗输运程序中实现了中子截面的快速在线展宽处理,并比较了NJOY程序与本文程序计算的截面数据。结果表明,本文程序给出的高温展宽截面准确性高,计算效率能满足快速在线展宽需求,可高效处理在线中子截面展宽问题。For the purpose of fast broadening neutron cross-section online in neutron trans- port calculations in high-temperature system, an amendatory Doppler broadening （ADB） principle was developed based on Doppler broadening method. An amendatory factor was proposed to correct the low-energy neutron cross-section, and the algorithm was optimized by adjusting the calculation techniques and selecting the appropriate numerical parameters. Fast online processing of neutron cross section by ADB method was realized in the Monte Carlo program developed by ourselves previously. The comparison between results of the calculation and that of NJOY program indicates that an energy-limitation exists in NJOY program in the high-energy region, and the ADB method is relatively accurate and efficient, and can satisfy the needs for fast broadening neutron cross-section online.

关 键 词：中子截面 多普勒展宽 修正 

分 类 号：TL32[核科学技术—核技术及应用]