^6Li中子转换靶14 MeV中子产额的数值计算  

Numerical Calculation of 14 MeV Neutron Yield in ^6Li Conversion Target

作　　者：商建波[1] 师全林[1] 代义华[1] 白涛[1] 徐晨曦 SHANG Jian-bo;SHI Quan-lin;DAI Yi-hua;BAI Tao;XU Chen-xi(Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西北核技术研究所,西安710024

出　　处：《现代应用物理》2020年第2期1-5,共5页Modern Applied Physics

摘　　要：为进一步开展^6LiD中子转换器的实验测量研究,本文利用蒙特卡罗方法基于ENDF/B-VⅡ.1库截面数据,建立了一种快速计算^6LiD转换靶内热中子转化为14 MeV高能中子的计算模型。首先,利用蒙特卡罗方法跟踪中子输运过程,确定中子和^6Li反应生成T粒子的能量、位置和发射方向;其次,利用SRIM软件计算了T粒子在输运过程中的线性能量损失;最后,结合截面数据分别计算T+D和T+^6Li反应的高能中子转换效率。利用加权减方差方法,计算得到热中子垂直入射6LiD转换靶情况下产生的高能中子能谱及T+D和T+^6Li反应的高能中子转换效率分别为1.65×10^-4和7.05×10^-5,总转换效率为2.30×10^-4。计算结果与文献结果一致,证明了本文计算模型的正确性。In this paper,a fast calculation model for calculating the neutron spectrum and conversion efficiency of 14 MeV induced in 6 LiD conversion target is developed based on the cross section data of ENDF/B-VⅡ.1 and Monte Carlo method.Firstly,the energy,position,and emission direction of tritium particles from neutron and 6Li reaction are determined by tracking the neutron transport process.Then,linear energy loss of tritium particles during transport is calculated by SRIM software.Finally,yields of high energy neutrons produced from the reactions of T+D and T+6Li are calculated according to the cross section data,respectively.The weighted method is used to reduce the uncertainty and to obtain ideal neutron spectra.The high energy neutron conversion efficiency of T + D and T +6Li reactions are 1.54×10-4 and 7.6 × 10-5,respectively,and the total conversion efficiency is 2.30 × 10-4.The calculated results are in agreement with the literature results,which show that the model is correct.

关 键 词：蒙特卡罗 中子转换靶 ^6LiD 

分 类 号：O571[理学—粒子物理与原子核物理]