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

  • JingLu Ma
  • Qian YueEmail author
  • ShinTed Lin
  • Henry Tsz-King Wong
  • JinWei Hu
  • LiPing Jia
  • Hao Jiang
  • Jin Li
  • ShuKui Liu
  • ZhongZhi Liu
  • Hao MaEmail author
  • WeiYou Tang
  • Yang Tian
  • Li Wang
  • Qing Wang
  • Yi Wang
  • LiTao Yang
  • Zhi Zeng
Article

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.

Keywords

cosmogenic activation production rate germanium detectors background level dark matter 

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • JingLu Ma
    • 1
    • 2
  • Qian Yue
    • 1
    Email author
  • ShinTed Lin
    • 3
  • Henry Tsz-King Wong
    • 4
  • JinWei Hu
    • 1
  • LiPing Jia
    • 1
  • Hao Jiang
    • 1
  • Jin Li
    • 1
  • ShuKui Liu
    • 3
  • ZhongZhi Liu
    • 1
  • Hao Ma
    • 1
    Email author
  • WeiYou Tang
    • 1
  • Yang Tian
    • 1
  • Li Wang
    • 5
  • Qing Wang
    • 1
    • 6
    • 7
  • Yi Wang
    • 1
    • 2
  • LiTao Yang
    • 1
    • 2
  • Zhi Zeng
    • 1
  1. 1.Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering PhysicsTsinghua UniversityBeijingChina
  2. 2.Department of PhysicsTsinghua UniversityBeijingChina
  3. 3.College of Physical Science and TechnologySichuan UniversityChengduChina
  4. 4.Institute of PhysicsAcademia SinicaTaipeiChina
  5. 5.Department of PhysicsBeijing Normal UniversityBeijingChina
  6. 6.Center for High Energy PhysicsTsinghua UniversityBeijingChina
  7. 7.Collaborative Innovation Center of Quantum MatterBeijingChina

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