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
张余炼 1郭一 1魏志勇 1宋金兴 2孙鹏飞 2郭义盼 1帅嘉 1闻雪1
作者信息
- 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
- 折叠
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.
Abstract
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 coincidence γ background 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Key words
Antineutrino detection/Reactor monitoring/Geant4/Multivariate analysis/Plastic scintillator引用本文复制引用
基金项目
中央高校基本科研业务费专项(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)
出版年
2024
NETL
NSTL
万方数据