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Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-IO experiment

ISSN号：1674-1137
期刊名称：《中国物理C：英文版》
时间：0
分类：O562.5[理学—原子与分子物理;理学—物理] TL942[核科学技术—辐射防护及环境保护]
作者机构：[1]Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China, [2]China Institute of Atomic Energy, Beijing 102413, China, [3]Nankai University, Tianjin 300071, China, [4]NUCTECH Company, Beijing 100084, China, [5]Sichuan University, Chengdu 610065, China, [6]Yalong River Hydropower Development Company, Chengdu 610051, China, [7]Department of Physics, Banaras Hindu University, Varanasi 221005, India
相关基金：Supported by National Natural Science Foundation of China （11175099, 10935005, 10945002, 11275107, 11105076） and State Key Development Program of Basic Research of China （2010CB833006）

作者：苏健[1], 曾志[1], 马豪[1], 岳骞[1], 程建平[1], 常建平[4], 陈楠[1], 陈宁[1], 陈庆豪[1], 陈云华[6], 庄又澄[72], 邓智[1], 杜强[5], 宫辉[1], 郝喜庆[1], 何庆驹[1], 黄瀚雄[2], 黄腾锐[72], 江灏[1], 康克军[1], 李浩斌[72], 李荐民[1], 李金[1], 李军[4], 李霞[2], 李新颖[3], 李学潜[3], 李玉兰[1], 李元景[1], 廖恒毅[72], 林枫凯[72], 林欣德[572], 刘书魁[5], 吕岚春[1], 毛绍基[4], 覃建强[1], 任杰[2], 任婧[1], 阮锡超[2], 申满斌[6], SINGH Lakhwinder[72], SINGH Manoj Kumar[72], SOMA Arun Kumar[72], 唐昌建[5], 曾昭雄[72], 王继敏[6], 王力[5], 王青[1], 王子敬[72], 吴世勇[6], 吴玉成[4], 幸浩洋[5], 徐音[3], 薛涛[1], 杨丽桃[1], 杨松纬[72], 易难[1], 喻纯旭[3], 于昊[1], 余训臻[5], 曾雄辉[6], 张岚[4], 张蕴华[6], 赵明刚[3], 赵伟[1], 周祖英[2], 朱敬军[5], 朱维彬[4], 朱雪洲[1], 朱忠华[6]

关键词：地下实验室, 结构材料, 探测器, 电子, 光子, 液氩, 否决权, GEANT4, CDEX-IO material photon and electron background, germanium detector, liquid argon, veto coincidentcut, Monte Carlo simulation

中文摘要：

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(<10-2events·kg1·day-1·ke V-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.

英文摘要：

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 tile 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 tile GEANT4 program. Then the photon and electron background level in the energy region of interest （〈10-2events-kg1·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.

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