高压倍加器靶单元组件对源中子能谱影响研究  

Effects of the HVMA Target Unit on Neutron Spectra Distribution

作　　者：王黎明 蒋婧[2] 鲍杰[3] 聂阳波[3] 黄翰雄[3] 李霞[3] 陈红涛 

机构地区：[1]国家核安保技术中心,北京102401 [2]环境保护部核与辐射安全中心,北京100082 [3]中国原子能科学研究院,北京102413

出　　处：《原子核物理评论》2016年第1期67-71,共5页Nuclear Physics Review

摘　　要：靶单元组件对中子有散射和吸收作用,与入射粒子也会发生反应,因此高压倍加器中子场在空间的分布除了由反应本身的角分布决定外,还受到靶单元组件的影响。实验利用飞行时间法测量了高压倍加器T(d,n)4He中子源产生的实际中子场,测量角度为0°～95°,共8个角度,采用伴随α粒子法对入射束流进行归一。借助蒙特卡罗方法模拟实验过程和靶单元组件等对中子场分布的影响,将实验结果同模拟计算得到的结果进行了比较与分析,为高压倍加器相关实验布局的合理布置和靶单元组件的优化提供了一定的依据。The spatial distribution of neutron field for the High Voltage Multiple Accelerator （HVMA） is not only determined by the angular distribution of the reaction itself, but also affected by scattering and absorption of the target unit. Meanwhile, undesired nuclear reactions of the incoming ions with the target and self-target build-up may contribute to this neutron background, which disturbs the primary neutron field： The spatial distribution of actual neutron field generated by T（d, n）aHe on HVMA was measured using the flight-time method. The neutron emission energy spectra were measured at 8 different angles from 0~ to 95~. The results were monitored by the accompanying-particle method. TARGET and MCNP （Monte Carlo simulation process） programs were used to simulate the experiment. The results of simulated calculation were compared with the experimental data. The analyzed results will give some qualitative and quantitative conclusions for target unit optimizing and provide some foundational works for physical measurement in HVMA.

关 键 词：实际中子场 飞行时间法 伴随粒子法 蒙特卡罗模拟 

分 类 号：O571.54[理学—粒子物理与原子核物理]