中子核截面在线多普勒展宽方法研究  

Research on On-the-Fly Doppler Broadening Method for Neutron Cross Section

作　　者：李松阳[1] 王侃[1] 余纲林[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《原子能科学技术》2013年第3期337-342,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(91126017);973计划资助项目(2007CB209807)

摘　　要：由中子截面多普勒展宽带来的反应性温度效应对反应堆中子学计算结果具有重要影响。基于自由气体模型和对靶核速度随机抽样的在线多普勒展宽方法,可使用0K温度下的中子截面对给定温度的问题进行蒙特卡罗计算,摆脱对专用多普勒展宽程序的依赖。本文通过对在线多普勒展宽方法的程序实现,针对典型算例进行了验证和分析,证明了该方法能处理反应性温度效应,并对其适用性和未来发展前景进行了评价。Temperature effect caused by Doppler broadening of neutron cross section plays a significant part in neutronics calculation of nuclear reactor.Based on free gas model and through sampling the velocity of target nucleus randomly,On-the-Fly Doppler broadening can be carried out in Monte Carlo calculation using zero-Kelvin cross section,which eliminates the need of Doppler processing codes.The method and examples were shown in this paper.The capability of this method to deal with temperature-reactivity effect was proved,and the applicability and further development were also discussed.

关 键 词：在线多普勒展宽 温度效应 自由气体模型 随机抽样 

分 类 号：TL32[核科学技术—核技术及应用]