中子能谱测量的反冲质子探测系统设计
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摘要
中子与氢原子核的弹性散射产生反冲质子是最重要、最基础、最常用的中子探测机制。反冲质子探测系统设计的基本任务是合理选择适合的参量,确保探测系统性能最优。该文利用Geant4模拟程序建立相关模型,确定了聚乙烯靶的厚度,研究了屏蔽体的几何参数、探测器的相对位置等参量对探测系统的影响,并得到了反冲质子产生时和出射时的能量、角度分布,以及0°和30°两个方向的微分分布。该工作对反冲质子法测量中子能谱研究具有重要的意义。
It is the most important, the most basic andmost commonly neutron detection mechanism that elastic scattering between hydrogen nuclei and neutron produces recoil proton. The basic task of system design is to find the appropriate parameters to ensure the optimal performance.In this paper,we established the correlation model by Geant4 simulation toolkit, determined the thickness of polyethylene target, and discussed the effect of the shield geometric parameters and the detector relative position on the detection system. The angular distribution and energy spectrum of recoil proton at the moment when it is just generated and ejectionare obtained, as well as the recoil proton differential distribution in 0°and 30°are obtained. This work is great significance to the study of neutron spectrum measurement by recoil proton method.
It is the most important, the most basic andmost commonly neutron detection mechanism that elastic scattering between hydrogen nuclei and neutron produces recoil proton. The basic task of system design is to find the appropriate parameters to ensure the optimal performance.In this paper,we established the correlation model by Geant4 simulation toolkit, determined the thickness of polyethylene target, and discussed the effect of the shield geometric parameters and the detector relative position on the detection system. The angular distribution and energy spectrum of recoil proton at the moment when it is just generated and ejectionare obtained, as well as the recoil proton differential distribution in 0°and 30°are obtained. This work is great significance to the study of neutron spectrum measurement by recoil proton method.
引文
[1]丁大钊,叶春堂,赵志祥,等.中子物理学——原理、方法与应用[M].北京:原子能出版社,2005.
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[4]郭海萍,安力,王新华,等.D-T中子照射下贫化铀球、钒球介质内中子能谱和伴生γ能谱测量[J].原子能科学技术,2007,41(3):283-287.
[5]刘金良.带电粒子束能量测量的光学方法研究[D].清华大学,2013.
[6]欧阳晓平.脉冲中子伽马探测系统性能表征与设计技术[J].中国工程科学,2009(5):44-43.
[7]Asai M.Geant4-A Simulation Toolkit[J].Nuclear Instruments&Methods in Physics Research,2007,506(3):250-303.
[2]王松林,黄翰雄,阮锡超,等.Measurement of the neutron spectrum of a Pu-C source with a liquid scintillator[J].Chinese Physics C,2009,33(5):378-382.
[3]安力,陈渊,郭海萍,等.含氢介质内中子能谱测量[J].原子能科学技术,2004,38(Z1):89-92.
[4]郭海萍,安力,王新华,等.D-T中子照射下贫化铀球、钒球介质内中子能谱和伴生γ能谱测量[J].原子能科学技术,2007,41(3):283-287.
[5]刘金良.带电粒子束能量测量的光学方法研究[D].清华大学,2013.
[6]欧阳晓平.脉冲中子伽马探测系统性能表征与设计技术[J].中国工程科学,2009(5):44-43.
[7]Asai M.Geant4-A Simulation Toolkit[J].Nuclear Instruments&Methods in Physics Research,2007,506(3):250-303.