针对中微子探测的多变量分析本底抑制方法  

Multivariate analysis background suppression methods for neutrino detection

作　　者：郭一 张余炼 魏志勇 GUO Yi;ZHANG Yulian;WEI Zhiyong(School of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Key Laboratory of Nuclear Technology Application and Radiation Protection in Astronautics,Ministry of Industry and Information Technology,Nanjing 211106,China)

机构地区：[1]南京航空航天大学航天学院,江苏南京211106 [2]空间核技术应用与辐射防护工业和信息化部重点实验室,江苏南京211106

出　　处：《哈尔滨工程大学学报》2023年第12期2192-2200,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金青年科学基金(12305201);中央高校基本科研业务费科研基地创新基金项目(NJ2023023).

摘　　要：为提高中微子探测的本底抑制效果,解决中微子探测器事例重建效率低的问题,本文提出了一种由多个塑料闪烁体单元耦合硅光电倍增管读出的小型阵列中微子探测器方案。基于阵列探测器的多变量分析方法,通过设计并制作小型阵列探测器,对多变量分析方法在中微子探测中对本底的抑制效果进行了研究。搭建了3×3的小型阵列探测器,测试了探测器的脉冲形状甄别能力和中子与伽马的不同拓扑结构。结合基于蒙特卡罗方法的计算,分析了阵列探测器多变量分析方法对本底抑制的有效性。结果表明:仿真与实验结果基本一致,多变量分析方法可以有效抑制本底。To improve the background suppression effect of neutrino detection and solve the problem of low event re-construction efficiency in neutrino detectors,this paper proposes a small array neutrino detector scheme composed of multiple plastic scintillator units coupled with silicon photomultiplier readout.The suppression effect of the multi-variate analysis method on the background in neutrino detection was studied using the multivariate analysis method of array detectors by designing and manufacturing small array detectors.A 3×3 small array detector was built,and the pulse shape discrimination capability of the detector and the different topological structures of neutrons and gam-mas were tested.Combined with Monte Carlo simulation-based analysis,the effectiveness of the array detector’s multivariate analysis method for background suppression was analyzed.The results show that the simulation and ex-perimental results are consistent,and the multivariate analysis method can effectively suppress background noise.

关 键 词：中微子探测 本底抑制方法 塑料闪烁体 多变量分析 阵列探测器 脉冲形状甄别 GEANT4 硅光电倍增管 极零相消 

分 类 号：TL99[核科学技术—核技术及应用]