基于塑料闪烁体阵列探测器的中微子事例重建方法  

The Neutrino Instance Reconstruction Method Based on the Plastic Scintillator Array

作　　者：张余炼 郭一 魏志勇 宋金兴 孙鹏飞 郭义盼 帅嘉 闻雪 ZHANG Yulian;GUO Yi;WEI Zhiyong;SONG Jinxing;SUN Pengfei;GUO Yipan;SHUAI Jia;WEN Xue(School of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing of Jiangsu Prov.211100,China;China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]南京航空航天大学航天学院,江苏南京211100 [2]中国原子能科学研究院,北京102413

出　　处：《核科学与工程》2024年第2期257-265,共9页Nuclear Science and Engineering

基　　金：中央高校基本科研业务费专项资金资助(NS2020064);装备预研快速扶持项目(NOA21011);国家自然科学基金(111775114);国家财政部稳定支持研究经费资助项目(WDJC-2019-16)。

摘　　要：反中微子探测技术为反应堆监测提供了一种新的有效手段。面向核反应堆的监测,研究了基于塑料闪烁体阵列探测器的中微子事例重建方法。使用Geant4计算了中微子在探测器内的快慢信号能量和延迟时间窗。采用传统快慢信号能量结合时间窗进行中微子事例重建,其重建效率为97%。考虑到中微子事例的主要本底,以模拟的阵列探测器各单元响应作为输入变量,引入多变量分析方法,系统分析了反中微子探测器对事例和本底的响应。结果表明,该重建方法的中微子总重建效率为78.6%的同时,可以拒绝84%具有时间关联的快中子本底与72.4%偶然符合的γ本底。证明了多变量分析方法抑制反中微子探测器宇宙线本底的有效性。The antineutrino detection technology provides a new and effective approach for reactor monitoring.The reconstruction method for neutrino instances with array structure detectors is studied for nuclear reactor monitoring.The detector behavior was simulated using the Geant4 simulation toolkit,including the energy range of prompt signals and delayed signals,along with the time window of the delayed coincidence.The conventional delayed coincidence technique is adopted to keep 97%of antineutrino events,which is ineffective for neutron background rejection.Consequently,a multivariate analysis technique was illustrated,which can reject 84%of the time-correlated fast neutron background events and 72.4%of the random coincidenceγbackground events while keeping 78.6%of antineutrino events.The effectiveness of the multivariate analysis technique to suppress the cosmic background of the antineutrino detector is demonstrated.

关 键 词：反中微子探测 反应堆监测 GEANT4 多变量分析 塑料闪烁体 

分 类 号：TL99[核科学技术—核技术及应用] TL812.1