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清华大学学报(自然科学版)  2017, Vol. 57 Issue (7): 768-773    DOI: 10.16511/j.cnki.qhdxxb.2017.25.035
  物理与工程物理 本期目录 | 过刊浏览 | 高级检索 |
载钆液闪探测器的稳定性测试与探测效率刻度
王力1, 杜强2, 康克军1, 岳骞1
1. 清华大学 工程物理系, 粒子技术与辐射成像教育部重点实验室, 北京 100084;
2. 四川大学 物理科学与技术学院, 成都 610065
Stability test and efficiency calibration of a gadolinium-loaded liquid scintillation detector
WANG Li1, DU Qiang2, KANG Kejun1, YUE Qian1
1. Key Laboratory of Particle and Radiation Imaging of Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
2. School of Physical Science and Technology, Sichuan University, Chengdu 610065, China
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摘要 中国暗物质实验(China dark matter experiment,CDEX)合作组设计并研制了大体积载钆液体闪烁体快中子探测器,用于中国锦屏地下实验室(China JinPing underground laboratory,CJPL)的快中子本底测量。该探测器基于反冲质子信号与钆俘获热中子产生的γ信号之间的符合测量方法,有效地抑制环境γ本底,提高对快中子的探测灵敏度。该文对该探测器进行了稳定性测试和单能中子探测效率刻度,实验结果表明:该探测器稳定可靠,且具有良好的中子、 γ信号甄别能力,以及较高的探测效率,适合对地下实验室极低通量快中子进行测量。
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王力
杜强
康克军
岳骞
关键词 暗物质地下实验室液闪探测器快中子探测效率    
Abstract:The China dark matter experiment (CDEX) collaboration has developed a large gadolinium-loaded liquid scintillation detector for neutron background measurements in the China JinPing underground laboratory (CJPL). Coincidence measurements of the recoil proton and neutron capture signals are used to suppress the gamma background. This paper presents stability tests and monoenergetic neutron detection efficiency calibration of the detector. The tests show that the detector photon yield is stable. The detector has good neutron and gamma pulse shape discrimination and a highly detection efficiency. Thus, this system is suitable for low intensity fast neutron measurements in the underground laboratory.
Key wordsdark matter    underground laboratory    liquid scintillation detector    fast neutron    detection efficiency
收稿日期: 2016-06-02      出版日期: 2017-07-22
ZTFLH:  O571.53  
通讯作者: 岳骞,副教授,E-mail:yueq@tsinghua.edu.cn     E-mail: yueq@tsinghua.edu.cn
引用本文:   
王力, 杜强, 康克军, 岳骞. 载钆液闪探测器的稳定性测试与探测效率刻度[J]. 清华大学学报(自然科学版), 2017, 57(7): 768-773.
WANG Li, DU Qiang, KANG Kejun, YUE Qian. Stability test and efficiency calibration of a gadolinium-loaded liquid scintillation detector. Journal of Tsinghua University(Science and Technology), 2017, 57(7): 768-773.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2017.25.035  或          http://jst.tsinghuajournals.com/CN/Y2017/V57/I7/768
  图1 实验测得的60Co能谱
  图2 60Co峰位随时间的变化
  图3 单能中子探测效率刻度实验装置
  图4 探测器和电子学系统框图
  图5 中子探测效率刻度实验中的nGγ甄别
  图6 快慢信号时间间隔分布
  表1 中子事例筛选流程及计算结果(14.8MeV)
  表2 各效率刻度点的探测效率
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