(α,n)反应中子产额与能谱计算方法  

A Monte-Carlo Simulation Method for Neutron Yield and Spectrum in (α,n) Reaction

作　　者：杨波[1] 衷斌[1] 徐琪 成立 潘流俊[1] 沈华韵[1] YANG Bo;ZHONG Bin;XU Qi;CHENG Li;PAN Liujun;SHEN Huayun(Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)

机构地区：[1]北京应用物理与计算数学研究所,北京100094

出　　处：《计算物理》2021年第4期393-400,共8页Chinese Journal of Computational Physics

基　　金：Supported by the National Natural Science Foundation of China (11405009,11771051,11705012);Science Chanllenge Project (TZ2018001)。

摘　　要：发展了(α,n)反应中子产额与能谱蒙特卡罗直接模拟方法,该方法采用通用的连续碰撞方法与SRIM程序计算的阻止本领模拟α粒子慢化过程,采用基于JENDL/AN-2005加工后ACE格式数据库计算(α,n)反应中子产额与能谱。基于NPTS程序研制了(α,n)反应模拟功能,轻核(α,n)反应产额与实验结果符合较好,B、F、O靶出射中子能谱与实验结果符合较好,而C、Al、Si与实验结果有一定差异。A direct Monte-Carlo simulation method was developed to calculate neutron yield and spectrum in( α,n)reaction. It is based on continuous collision method,using stopping power computed by the program SRIM to simulate the moderation of α-particle and the ACE format of the nuclear data library JENDL/AN-2005 to calculate the neutron yield and spectrum in( α,n) reaction. Moreover,a( α,n)-simulator was developed based on the program NPTS.( α,n) neutron yields of light nuclides obtained in our simulations are consistent with experiments. In terms of( α,n) neutron spectrum,our results are in good agreement with experiments in the cases of B,F and O targets,while deviations are present in the cases of C,Al and Si.

关 键 词：(α n)反应 蒙特卡罗模拟 中子产额 中子能谱 

分 类 号：O571.5[理学—粒子物理与原子核物理]