【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。更多还原

【Abstract】 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.更多还原