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采用基于蒙特卡罗方法的Geant4软件设计了由40个载Gd液闪探测器组成的多单元4π立体角探测系统。该探测系统与置于其几何中心的裂变室构成了一个研究平台,该平台主要用于可裂变核(n,2n)反应截面的测量工作。首先对该系统的物理模型进行了初步检验,然后计算并分析了该探测系统的一些基本性能。通过计算发现,系统空腔半径的变化对中子探测效率的影响十分有限;而探测效率随探测器的厚度增加先是迅速增大,然后逐渐趋于平缓;计算还表明,Gd同位素俘获中子后发射的级联γ射线的能量主要沉积在局部几个相邻的探测器中。基于以上计算,初步确定了系统的厚度以及空腔半径的大小,并对下一步将要开展的工作做了初步规划。
Geant4 software based on Monte Carlo method was used to design a multi-unit 4π solid angle detection system composed of 40 Gd liquid-filled detectors. The detection system and the fission chamber placed in its geometric center form a research platform for the measurement of the fissile nuclear (n, 2n) reaction cross section. First of all, the physical model of the system was first tested, and then some basic performance of the detection system was calculated and analyzed. The calculation results show that the change of the system cavity radius has a very limited effect on the neutron detection efficiency. The detection efficiency increases rapidly with the increase of the detector thickness and then gradually becomes gentle. The calculation also shows that the Gd isotope capture neutron The energy of the emitted cascaded gamma rays is mainly deposited in several local detectors. Based on the above calculation, the thickness of the system and the radius of the cavity are preliminarily determined, and the preliminary work on the next step is planned.