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

查看全文 作　　者：JingLu [1,2]Ma;Qian [1]Yue;ShinTed [3]Lin;Henry Tsz-King [4]Wong;JinWei [1]Hu;LiPing [1]Jia;Hao [1]Jiang;Jin [1]Li;ShuKui [3]Liu;ZhongZhi [1]Liu;Hao [1]Ma;WeiYou [1]Tang;Yang [1]Tian;Li [5]Wang;Qing [1,6,7]Wang;Yi [1,2]Wang;LiTao [1,2]Yang;Zhi [1]Zeng

机构地区：[1]Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University;[2]Department of Physics, Tsinghua University;[3]College of Physical Science and Technology, Sichuan University;[4]Institute of Physics,Academia Sinica;[5]Department of Physics, Beijing Normal University;[6]Center for High Energy Physics, Tsinghua University;[7]Collaborative Innovation Center of Quantum Matter

出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2019年第62卷第1期,共10页

基　　金：supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0402200,and 2017YFA0402201);the National Science Fund for Distinguished Young Scholars(Grant No.11725522);the National Natural Science Foundation of China(Grant Nos.11475092,11475099,and 11675088);the National Basic Research Program of China(Grant No.2010CB833006);the Tsinghua University Initiative Scientific Research Program(Grant No.20151080354) 摘　　要：A study on cosmogenic activation in germanium was carried out to evaluate the cosmogenic background level of natural and ^(70)Ge 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. 关键词：COSMOGENIC ACTIVATION production rate GERMANIUM detectors BACKGROUND level DARK MATTER

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

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