Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search

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英文篇名：Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search 作者：Hao ; Jiang ; LiTao ; Yang ; Qian ; Yue ; KeJun ; Kang ; JianPing ; Cheng ; YuanJing ; Li ; Henry ; Tsz-King ; Wong ; M.A?artio?lu ; HaiPeng ; An ; JianPing ; Chang ; JingHan ; Chen ; YunHua ; Chen ; Zhi ; Deng ; Qiang ; Du ; Hui ; Gong ; Li ; He ; Jin ; Wei ; Hu ; QingDong ; Hu ; HanXiong ; Huang ; LiPing ; Jia ; HauBin ; Li ; Hong ; Li ; Jian ; Min ; Li ; Jin ; Li ; Xia ; Li ; XueQian ; Li ; YuLan ; Li ; Bin ; Liao ; FongKay ; Lin ; ShinTed ; Lin ; ShuKui ; Liu ; YanDong ; Liu ; YuanYuan ; Liu ; ZhongZhi ; Liu ; Hao ; Ma ; JingLu ; Ma ; Hui ; Pan ; Jie ; Ren ; XiChao ; Ruan ; B.Sevda ; Vivek ; Sharma ; ManBin ; Shen ; Lakhwinder ; Singh ; Monoj ; Kumar ; Singh ; TianXi ; Sun ; ChangJian ; Tang ; WeiYou ; Tang ; Yang ; Tian ; GuangFu ; Wang ; JiMin ; Wang ; Li ; Wang ; Qing ; Wang ; Yi ; Wang ; ShiYong ; Wu ; YuCheng ; Wu ; HaoYang ; Xing ; Yin ; Xu ; Tao ; Xue ; SongWei ; Yang ; Nan ; Yi ; ChunXu ; Yu ; HaiJun ; Yu ; JianFeng ; Yue ; XiongHui ; Zeng ; Ming ; Zeng ; Zhi ; Zeng ; FengShou ; Zhang ; YunHua ; Zhang ; MingGang ; Zhao ; JiFang ; Zhou ; ZuYing ; Zhou ; JingJun ; Zhu ; ZhongHua ; Zhu 英文作者：Hao Jiang;LiTao Yang;Qian Yue;KeJun Kang;JianPing Cheng;YuanJing Li;Henry Tsz-King Wong;M.A?artio?lu;HaiPeng An;JianPing Chang;JingHan Chen;YunHua Chen;Zhi Deng;Qiang Du;Hui Gong;Li He;Jin Wei Hu;QingDong Hu;HanXiong Huang;LiPing Jia;HauBin Li;Hong Li;Jian Min Li;Jin Li;Xia Li;XueQian Li;YuLan Li;Bin Liao;FongKay Lin;ShinTed Lin;ShuKui Liu;YanDong Liu;YuanYuan Liu;ZhongZhi Liu;Hao Ma;JingLu Ma;Hui Pan;Jie Ren;XiChao Ruan;B.Sevda;Vivek Sharma;ManBin Shen;Lakhwinder Singh;Monoj Kumar Singh;TianXi Sun;ChangJian Tang;WeiYou Tang;Yang Tian;GuangFu Wang;JiMin Wang;Li Wang;Qing Wang;Yi Wang;ShiYong Wu;YuCheng Wu;HaoYang Xing;Yin Xu;Tao Xue;SongWei Yang;Nan Yi;ChunXu Yu;HaiJun Yu;JianFeng Yue;XiongHui Zeng;Ming Zeng;Zhi Zeng;FengShou Zhang;YunHua Zhang;MingGang Zhao;JiFang Zhou;ZuYing Zhou;JingJun Zhu;ZhongHua Zhu;Key Laboratory of Particle and Radiation Imaging (Ministry of Education)and Department of Engineering Physics, Tsinghua University;College of Nuclear Science and Technology, Beijing Normal University;Institute of Physics, Academia Sinica;Department of Physics, Dokuz Eylül University;Department of Physics, Tsinghua University;NUCTECH Company;Ya Long River Hydropower Development Company;College of Physical Science and Technology, Sichuan University;Department of Nuclear Physics, China Institute of Atomic Energy;School of Physics, Nankai University;Department of Physics, Banaras Hindu University;Department of Physics, Beijing Normal University; 英文关键词：WIMP;;pPCGe;;liquid nitrogen;;bulk/surface event discrimination;;extremely fast events 中文刊名：JGXG 英文刊名：中国科学:物理学 力学 天文学(英文版) 机构：Key Laboratory of Particle and Radiation Imaging (Ministry of Education)and Department of Engineering Physics, Tsinghua University;College of Nuclear Science and Technology, Beijing Normal University;Institute of Physics, Academia Sinica;Department of Physics, Dokuz Eylül University;Department of Physics, Tsinghua University;NUCTECH Company;Ya Long River Hydropower Development Company;College of Physical Science and Technology, Sichuan University;Department of Nuclear Physics, China Institute of Atomic Energy;School of Physics, Nankai University;Department of Physics, Banaras Hindu University;Department of Physics, Beijing Normal University; 出版日期：2018-09-19 10:22 出版单位：Science China(Physics,Mechanics & Astronomy) 年：2019 期：v.62 基金：supported by the National Key Research and Development Program of China(Grant No.2017YFA0402201);; the National Natural Science Foundation of China(Grant Nos.11475092,11475099,11675088,and 11725522) 语种：英文; 页：JGXG201903007 页数：8 CN：03 ISSN：11-5849/N 分类号：62-69

摘要

The CDEX-10 experiment searches for light weakly interacting massive particles, a form of dark matter, at the China Jinping Underground Laboratory, where approximately 10 kg of germanium detectors are arranged in an array and immersed in liquid nitrogen. Herein, we report on the experimental apparatus, detector characterization, and spectrum analysis of one prototype detector. Owing to the higher rise-time resolution of the CDEX-10 prototype detector as compared with CDEX-1 B, we identified the origin of an observed category of extremely fast events. For data analysis of the CDEX-10 prototype detector, we introduced and applied an improved bulk/surface event discrimination method. The results of the new method were compared to those of the CDEX-1 B spectrum. Both sets of results showed good consistency in the 0-12 ke Vee energy range, except for the 8.0 keV K-shell X-ray peak from the external copper.
        The CDEX-10 experiment searches for light weakly interacting massive particles, a form of dark matter, at the China Jinping Underground Laboratory, where approximately 10 kg of germanium detectors are arranged in an array and immersed in liquid nitrogen. Herein, we report on the experimental apparatus, detector characterization, and spectrum analysis of one prototype detector. Owing to the higher rise-time resolution of the CDEX-10 prototype detector as compared with CDEX-1 B, we identified the origin of an observed category of extremely fast events. For data analysis of the CDEX-10 prototype detector, we introduced and applied an improved bulk/surface event discrimination method. The results of the new method were compared to those of the CDEX-1 B spectrum. Both sets of results showed good consistency in the 0-12 ke Vee energy range, except for the 8.0 keV K-shell X-ray peak from the external copper.

引文

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