CDEX-1 1 kg point-contact germanium detector for low mass dark matter searches  

作　　者：康克军 岳赛 吴呈城 程建平 李元景 白杨 毕勇 常建平 陈楠 陈宁 陈庆豪 陈云华 庄又澄 邓智 杜强 宫辉 郝喜庆 何庆驹 胡鑫洄 黄瀚雄 黄腾锐 江灏 李浩斌 李荐民 李金 李军 李霞 李新颖 李学潜 李玉兰 廖恒毅 林枫凯 林欣德 刘书魁 吕岚春 马豪 毛绍基 覃建强 任杰 任婧 阮锡超 申满斌 Lakhwinder SINGH Manoj Kumar SINGH Arun Kumar SOMA 苏健 唐昌建 曾昭雄 王继敏 王力 王青 王子敬 吴世勇 吴蔚 吴玉成 幸浩洋 徐音 薛涛 杨丽桃 杨松纬 易难 喻纯旭 于昊 余训臻 曾雄辉 曾志 张岚 张蕴华 赵明刚 赵伟 钟苏宁 周祖英 朱敬军 朱维彬 朱学洲 朱忠华 

机构地区：[1]Tsinghua University [2]Nankai University [3]Sichuan University [4]NUCTECH Company [5]YaLong River Hydropower Development Company [6]Institute of Physics, AS [7]China Institute of Atomic Energy [8]Department of Physics, Banaras Hindu University

出　　处：《Chinese Physics C》2013年第12期58-64,共7页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(10935005,10945002,11275107,11175099);National Basic Research Program of China(973 Program)(2010CB833006)

摘　　要：The CDEX collaboration has been established for direct detection of light dark matter particles, using ultra-low energy threshold point-contact p-type germanium detectors, in China JinPing underground Laboratory （CJPL）. The first 1 kg point-contact germanium detector with a sub-keV energy threshold has been tested in a passive shielding system located in CJPL. The outputs from both the point-contact P＋ electrode and the outside N＋ electrode make it possible to scan the lower energy range of less than 1 keV and at the same time to detect the higher energy range up to 3 MeV. The outputs from both P＋ and N＋ electrode may also provide a more powerful method for signal discrimination for dark matter experiment. Some key parameters, including energy resolution, dead time, decay times of internal X-rays, and system stability, have been tested and measured. The results show that the 1 kg point-contact germanium detector, together with its shielding system and electronics, can run smoothly with good performances. This detector system will be deployed for dark matter search experiments.The CDEX collaboration has been established for direct detection of light dark matter particles, using ultra-low energy threshold point-contact p-type germanium detectors, in China JinPing underground Laboratory （CJPL）. The first 1 kg point-contact germanium detector with a sub-keV energy threshold has been tested in a passive shielding system located in CJPL. The outputs from both the point-contact P＋ electrode and the outside N＋ electrode make it possible to scan the lower energy range of less than 1 keV and at the same time to detect the higher energy range up to 3 MeV. The outputs from both P＋ and N＋ electrode may also provide a more powerful method for signal discrimination for dark matter experiment. Some key parameters, including energy resolution, dead time, decay times of internal X-rays, and system stability, have been tested and measured. The results show that the 1 kg point-contact germanium detector, together with its shielding system and electronics, can run smoothly with good performances. This detector system will be deployed for dark matter search experiments.

关 键 词：CDEX point-contact germanium detector dark matter CJPL 

分 类 号：P145.9[天文地球—天体物理]