Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment

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SU Jian, ZENG Zhi, MA Hao, YUE Qian, CHENG Jian-Ping, CHANG Jian-Ping, CHEN Nan, CHEN Ning, CHEN Qing-Hao, CHEN Yun-Hua, CHUANG Yo-Chun, DENG Zhi, DU Qiang, GONG Hui, HAO Xi-Qing, HE Qing-Ju, HUANG Han-Xiong, HUANG Teng-Rui, JIANG Hao, KANG Ke-Jun, LI Hau-Bin and et al. Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment[J]. Chinese Physics C, 2015, 39(3): 036001. doi: 10.1088/1674-1137/39/3/036001
SU Jian, ZENG Zhi, MA Hao, YUE Qian, CHENG Jian-Ping, CHANG Jian-Ping, CHEN Nan, CHEN Ning, CHEN Qing-Hao, CHEN Yun-Hua, CHUANG Yo-Chun, DENG Zhi, DU Qiang, GONG Hui, HAO Xi-Qing, HE Qing-Ju, HUANG Han-Xiong, HUANG Teng-Rui, JIANG Hao, KANG Ke-Jun, LI Hau-Bin and et al. Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment[J]. Chinese Physics C, 2015, 39(3): 036001.  doi: 10.1088/1674-1137/39/3/036001 shu
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Received: 2014-02-20
Revised: 2014-09-12
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Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment

    Corresponding author: YUE Qian,

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 (<10-2events·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.

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