厚靶低中能^(9)Be(d,xn)反应加速器中子源特性研究

Research on the Accelerator Neutron Source Characteristics Based on^(9)Be(d,xn)Reaction with Thick Target in the Low and Medium Energy Range

利用PHITS程序评价计算了厚靶^(9)Be(d,xn)反应加速器中子源的能谱和角分布数据,重点讨论了JQMD、INCL和INCL/DWBA三种核反应物理模型计算厚靶^(9)Be(d,xn)反应中子辐射场分布的适用性。研究结果显示,基于INCL/DWBA耦合模型的PHITS程序计算所得到的厚靶^(9)Be(d,xn)反应中子能谱和角分布数据能够较好地与实验数据符合,可以为厚靶^(9)Be(d,xn)反应中子源特性研究及应用提供较为准确的中子辐射场数据。此外,设计了水冷大面积旋转铍靶的方案,并在5~25 MeV/5 mA入射氘能量下条件下,开展了靶面温度模拟研究,结果显示,靶面最高温度可控制在100℃以下。

In this paper,the energy spectrum and angular distribution data of neutron source of^(9)Be(d,xn)reaction accelerator with thick target are evaluated and calculated by using PHITS program.The applicability of JQMD,INCL and INCL/DWBA nuclear reaction physical models to calculate the neutron radiation field distribution of^(9)Be(d,xn)reaction with thick target is discussed.The results show that the energy spectrum and angular distribution data of the thick target^(9)Be(d,xn)reaction calculated by the PHITS program based on the INCL/DWBA nuclear reaction physical model are in good agreement with the experimental data,and can provide more accurate neutron radiation field data for the study and application of the characteristics of^(9)Be(d,xn)reaction neutron source with thick target.In addition,the scheme of water-cooled large-area rotating beryllium target is designed,and the simulation study of target surface temperature is carried out under the condition of 5~25 MeV/5 mA incident deuterium energy.The results show that the maximum temperature of target surface can be controlled below 100℃.