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

论文摘要

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.

论文目录

• 1 Introduction
• 2 Cosmogenic activation in germanium
•   2.1 Evaluation tools
•   2.2 Cosmogenic production rates of radionuclides
• 3 Validation of calculation codes by CDEX-1B data
•   3.1 Exposure history of CDEX-1B
•   3.2 Data analysis and spectra comparison
• 4 Cosmogenic background in the future tonne-scale CDEX experiment
•   4.1 Controlled germanium processing and detector fab-rication
•     4.1.1 Natural germanium
•   4.2 Cosmogenic background of HPGe detectors for dark matter detection
•     4.2.1 Natural germanium
•     4.2.270Ge depleted germanium
•     4.2.3 Underground crystal growth and detector fabrication
•   4.3 Potential for new physics
•     4.3.1 Solar neutrino detection
•     4.3.2 0νββdecay detection
• 5 Summary

文章来源

类型: 期刊论文

作者: JingLu Ma,Qian Yue,ShinTed Lin,Henry Tsz-King Wong,JinWei Hu,LiPing Jia,Hao Jiang,Jin Li,ShuKui Liu,ZhongZhi Liu,Hao Ma,WeiYou Tang,Yang Tian,Li Wang,Qing Wang,Yi Wang,LiTao Yang,Zhi Zeng

来源: Science China(Physics,Mechanics & Astronomy) 2019年01期

年度: 2019

分类: 基础科学

专业: 天文学

单位: Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University,Department of Physics, Tsinghua University,College of Physical Science and Technology, Sichuan University,Institute of Physics,Academia Sinica,Department of Physics, Beijing Normal University,Center for High Energy Physics, Tsinghua University,Collaborative Innovation Center of Quantum Matter

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)

分类号: P159

页码: 36-45

总页数: 10

文件大小: 896K

下载量: 14