载钆液闪探测器的稳定性测试与探测效率刻度  

Stability test and efficiency calibration of a gadolinium-loaded liquid scintillation detector

作　　者：王力[1] 杜强[2] 康克军[1] 岳骞[1] WANG Li DU Qiang KANG Kejun YUE Qian(Key Laboratory of Particle and Radiation Imaging of Ministry of Education, Department of Engineering Physics Tsinghua University, Beijing 100084, China School of Physical Science and Technology, Sichuan University, Chengdu 610065, China)

机构地区：[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

出　　处：《清华大学学报（自然科学版）》2017年第7期768-773,共6页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(11475099)

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。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.

关 键 词：暗物质 地下实验室 液闪探测器 快中子 探测效率 

分 类 号：O571.53[理学—粒子物理与原子核物理]