高能质子核反应截面的Monte Carlo计算

根据高能质子核反应的核内级联模型,采用Monte Carlo方法对高能质子入射靶核的核反应过程进行了模拟计算。碰撞进入靶核内的质子初始位置由随机抽样得到,而初始的能量和动量通过守恒定律计算得出;靶核内的核子数密度采用均匀分布近似;被碰核子的初始动量从Fermi分布中随机抽样得到,被碰核子的初始运动方向从各向同性分布中抽样;核子-核子碰撞动力学采用相对论下的两体碰撞近似。编程计算了高能质子核反应截面、次级粒子能谱等数据,并与相关结果进行了对比分析。

Monte Carlo simulations of nuclear reactions induced by high energy protons

The intra-nuclear cascade model was used in a Monte Carlo simulation of nuclear reactions induced by high energy protons projected on a target nuclei.The source position was sampled as the high energy proton hit the target nuclei,with the source momentum and energy calculated from conservation laws.The nucleon were assumed to be uniformly distributed in the nuclei,the original momentum of target nucleus was sampled from the Fermi distribution,and the movement direction was sampled from a normal distribution.The nucleon-nucleon collision was modeled using a relativistic binary collision approximation.The algorithm was used to calculate proton induced reaction cross sections and the secondary emission spectrum.The results show good consistent with those calculated or experimental results in other papers.