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Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment

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Abstract

A study on cosmogenic activation in germanium was carried out to evaluate the cosmogenic background level of natural and 70Ge depleted germanium detectors. The production rates of long-lived radionuclides were calculated with Geant4 and CRY. Results were validated by comparing the simulated and experimental spectra of CDEX-1B detector. Based on the validated codes, the cosmogenic background level was predicted for further tonne-scale CDEX experiment. The suppression of cosmogenic background level could be achieved by underground germanium crystal growth and high-purity germanium detector fabrication to reach the sensitivity requirement for direct detection of dark matter. With the low cosmogenic background, new physics channels, such as solar neutrino research and neutrinoless double-beta decay experiments, were opened and the corresponding simulations and evaluations were carried out.

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Authors and Affiliations

  1. Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing, 100084, China

    JingLu Ma, Qian Yue, JinWei Hu, LiPing Jia, Hao Jiang, Jin Li, ZhongZhi Liu, Hao Ma, WeiYou Tang, Yang Tian, Qing Wang, Yi Wang, LiTao Yang & Zhi Zeng

  2. Department of Physics, Tsinghua University, Beijing, 100084, China

    JingLu Ma, Yi Wang & LiTao Yang

  3. College of Physical Science and Technology, Sichuan University, Chengdu, 610064, China

    ShinTed Lin & ShuKui Liu

  4. Institute of Physics, Academia Sinica, Taipei, 11529, China

    Henry Tsz-King Wong

  5. Department of Physics, Beijing Normal University, Beijing, 100875, China

    Li Wang

  6. Center for High Energy Physics, Tsinghua University, Beijing, 100084, China

    Qing Wang

  7. Collaborative Innovation Center of Quantum Matter, Beijing, 100084, China

    Qing Wang

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  1. JingLu Ma
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  2. Qian Yue
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Corresponding authors

Correspondence to Qian Yue or Hao Ma.

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Ma, J., Yue, Q., Lin, S. et al. Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment. Sci. China Phys. Mech. Astron. 62, 11011 (2019). https://doi.org/10.1007/s11433-018-9215-0

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  • DOI: https://doi.org/10.1007/s11433-018-9215-0

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