High‑accuracy measurement of Compton scattering in germanium for dark matter searches

作     者：Hai‑Tao Jia Shin‑Ted Lin Shu‑Kui Liu Hsin‑Chang Chi Muhammed Deniz Chang‑Hao Fang Peng Gu Xi Jiang Yi‑Ke Shu Qian‑Yun Li Yu Liu Ren‑Ming‑Jie Li Chen‑Kai Qiao Chang‑Jian Tang Henry Tsz‑King Wong Hao‑Yang Xing Li‑Tao Yang Qian Yue Yu‑Lu Yan Kang‑Kang Zhao Jing‑Jun Zhu Hai-Tao Jia;Shin-Ted Lin;Shu-Kui Liu;Hsin-Chang Chi;Muhammed Deniz;Chang-Hao Fang;Peng Gu;Xi Jiang;Yi-Ke Shu;Qian-Yun Li;Yu Liu;Ren-Ming-Jie Li;Chen-Kai Qiao;Chang-Jian Tang;Henry Tsz-King Wong;Hao-Yang Xing;Li-Tao Yang;Qian Yue;Yu-Lu Yan;Kang-Kang Zhao;Jing-Jun Zhu

作者机构：College of PhysicsSichuan University610065 ChengduChina Department of PhysicsNational Dong Hwa University97401 ShoufengHualienChina Department of PhysicsDokuz Eylül University35160 BucaİzmirTurkey Institute of PhysicsAcademia Sinica11529 TaipeiChina Key Laboratory of Particle and Radiation Imaging(Ministry of Education)and Department of Engineering PhysicsTsinghua University100084 BeijingChina Institute of Nuclear Science and TechnologySichuan University610065 ChengduChina 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2022年第33卷第12期

页      面：75-87页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the National Key Research and Development Program of China(No.2017YFA0402203) the National Natural Science Foundation of China(Nos.11975159 and 11975162) 

主　　题：Compton scattering experiment Germanium detector Atomic many-body effects Geant4 Dark matter 

摘      要：Compton scattering with bound electrons contributes to a significant atomic effect in low-momentum transfer,yielding background structures in direct light dark matter searches as well as low-energy rare event *** report the measurement of Compton scattering in low-momentum transfer by implementing a 10-g germanium detector bombarded by a^(137)Cs source with a radioactivity of 8.7 mCi and a scatter photon captured by a cylindrical NaI(Tl)detector.A fully relativistic impulse approximation combined with multi-configuration Dirac–Fock wavefunctions was evaluated,and the scattering function of Geant4 software was replaced by our calculation *** measurements show that the Livermore model with the modified scattering function in Geant4 is in good agreement with the experimental *** is also revealed that atomic many-body effects significantly influence Compton scattering for low-momentum transfer(sub-keV energy transfer).