Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment*Supported by National Natural Science Foundation of China (11175099, 10935005, 10945002, 11275107, 11105076) and State Key Development Program of Basic Research of China (2010CB833006). (March 2015)

• Record Type: Journal Article
• Authors: Su 苏, Jian 健; Zeng 曾, Zhi 志; Ma 马, Hao 豪; Yue 岳, Qian 骞; Cheng 程, Jian-Ping 建平; Chang 常, Jian-Ping 建平; Chen 陈, Nan 楠; Chen 陈, Ning 宁; Chen 陈, Qing-Hao 庆豪; Chen 陈, Yun-Hua 云华; Chuang 庄, Yo-Chun 又澄; Deng 邓, Zhi 智; Du 杜, Qiang 强; Gong 宫, Hui 辉; Hao 郝, Xi-Qing 喜庆; He 何, Qing-Ju 庆驹; Huang 黄, Han-Xiong 瀚雄; Huang 黄, Teng-Rui 腾锐; Jiang 江, Hao 灏; Kang 康, Ke-Jun 克军; Li 李, Hau-Bin 浩斌; Li 李, Jian-Min 荐民; Li 李, Jin 金; Li 李, Jun 军; Li 李, Xia 霞; Li 李, Xin-Ying 新颖; Li 李, Xue-Qian 学潜; Li 李, Yu-Lan 玉兰; Li 李, Yuan-Jing 元景; Liao 廖, Heng-Yi 恒毅; Lin 林, Fong-Kay 枫凯; Lin 林, Shin-Ted 欣德; Liu 刘, Shu-Kui 书魁; Lü 吕, Lan-Chun 岚春; Mao 毛, Shao-Ji 绍基; Qin 覃, Jian-Qiang 建强; Ren 任, Jie 杰; Ren 任, Jing 婧; Ruan 阮, Xi-Chao 锡超; Shen 申, Man-Bin 满斌; Singh, Lakhwinder; Singh, Manoj Kumar; Soma, Arun Kumar; Tang 唐, Chang-Jian 昌建; Tseng 曾, Chao-Hsiung 昭雄; Wang 王, Ji-Min 继敏; Wang 王, Li 力; Wang 王, Qing 青; Wong 王, Tsz-King Henry 子敬; Wu 吴, Shi-Yong 世勇; Wu 吴, Yu-Cheng 玉成; Xing 幸, Hao-Yang 浩洋; Xu 徐, Yin 音; Xue 薜, Tao 涛; Yang 杨, Li-Tao 丽桃; Yang 杨, Song-Wei 松纬; Yi 易, Nan 难; Yu 喻, Chun-Xu 纯旭; Yu 于, Hao 昊; Yu 余, Xun-Zhen 训臻; Zeng 曾, Xiong-Hui 雄辉; Zhang 张, Lan 岚; Zhang 张, Yun-Hua 蕴华; Zhao 赵, Ming-Gang 明刚; Zhao 赵, Wei 伟; Zhou 周, Zu-Ying 祖英; Zhu 朱, Jing-Jun 敬军; Zhu 朱, Wei-Bin 维彬; Zhu 朱, Xue-Zhou 雪洲; Zhu 朱, Zhong-Hua 忠华;
• Is Part Of: Chinese physics C. Volume 39:Number 3(2015:Mar.)
• Publication Date: 2015-03
• Subjects: 95.35.+d -- 95.55.Vj; CDEX-10 material photon and electron background -- germanium detector -- liquid argon -- veto coincident cut -- Monte Carlo simulation; Particles (Nuclear physics) -- Periodicals; Nuclear physics -- Periodicals; 539.76
• DOI: 10.1088/1674-1137/39/3/036001
• Languages: English
• ISSNs: 1674-1137

Abstract

Abstract: The China Dark Matter Experiment (CDEX) is located at the China Jinping Underground Laboratory (CJPL) and aims to directly detect the weakly interacting massive particles (WIMP) flux with high sensitivity in the low mass region. Here we present a study of the predicted photon and electron backgrounds including the background contribution of the structure materials of the germanium detector, the passive shielding materials, and the intrinsic radioactivity of the liquid argon that serves as an anti-Compton active shielding detector. A detailed geometry is modeled and the background contribution has been simulated based on the measured radioactivities of all possible components within the GEANT4 program. Then the photon and electron background level in the energy region of interest (<10 −2 events·kg 1 ·day −1 ·keV −1 (cpkkd)) is predicted based on Monte Carlo simulations. The simulated result is consistent with the design goal of the CDEX-10 experiment, 0.1cpkkd, which shows that the active and passive shield design of CDEX-10 is effective and feasible.