Low radioactive material screening and background control for the PandaX-4T experiment

A bstract PandaX-4T is a ton-scale dark matter direct detection experiment using a dual-phase TPC technique at the China Jinping Underground Laboratory. Various ultra-low background technologies have been developed and applied to material screening for PandaX-4T, including HPGe gamma spectroscopy, I...

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Veröffentlicht in:	The journal of high energy physics 2022-06, Vol.2022 (6), p.147-20, Article 147
Hauptverfasser:	Qian, Zhicheng, Si, Lin, Abdukerim, Abdusalam, Bo, Zihao, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Chen, Cheng, Yunshan, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Yanlin, Huang, Zhou, Hou, Ruquan, Ji, Xiangdong, Ju, Yonglin, Li, Chenxiang, Li, Mingchuan, Li, Shu, Li, Shuaijie, Lin, Qing, Liu, Jianglai, Lu, Xiaoying, Luo, Lingyin, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Ning, Xuyang, Qi, Ningchun, Ren, Xiangxiang, Shaheed, Nasir, Shang, Changsong, Shen, Guofang, Sun, Wenliang, Tan, Andi, Tao, Yi, Wang, Anqing, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wu, Mengmeng, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yan, Xiyu, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Zhang, Dan, Zhang, Minzhen, Zhang, Peng, Zhang, Tao, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng, Zhou, Yong
Format:	Artikel
Sprache:	eng
Schlagworte:	Classical and Quantum Gravitation Collaboration Cosmic rays Cosmology Dark matter Dark Matter and Double Beta Decay (experiments) Elementary Particles Experiments Gamma spectroscopy High energy physics Krypton Laboratories Monte Carlo simulation Particle physics Physics Physics and Astronomy Quantum Field Theories Quantum Field Theory Quantum Physics Radioactive materials Radioactivity Radioisotopes Rare Decay Recoil Regular Article - Experimental Physics Relativity Theory Screening Sensors String Theory Surface treatment
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Zusammenfassung:	A bstract PandaX-4T is a ton-scale dark matter direct detection experiment using a dual-phase TPC technique at the China Jinping Underground Laboratory. Various ultra-low background technologies have been developed and applied to material screening for PandaX-4T, including HPGe gamma spectroscopy, ICP-MS, NAA, radon emanation measurement system, krypton assay station, and alpha detection system. Low background materials were selected to assemble the detector. Surface treatment procedures were investigated to further suppress radioactive background. Combining measured results and Monte Carlo simulation, the total material background rates of PandaX-4T in the energy region of 1–25 keV ee are estimated to be (9.9 ± 1.9) × 10 − 3 mDRU for electron recoil and (2.8 ± 0.6) × 10 − 4 mDRU for nuclear recoil. In addition, nat Kr in the detector is estimated to be < 8 ppt.
ISSN:	1029-8479 1029-8479
DOI:	10.1007/JHEP06(2022)147