用ra气态源对Pandax-II检测器的内部校准

论文标题

用ra气态源对Pandax-II检测器的内部校准

Internal Calibration of the PandaX-II Detector with Radon Gaseous Sources

论文作者

Ma, Wenbo, Abdukerim, Abdusalam, Bo, Zihao, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Chen, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Ke, He, Changda, He, Shengming, Huang, Di, Huang, Yan, Huang, Yanlin, Huang, Zhou, Ji, Xiangdong, Ju, Yonglin, Li, Shuaijie, Liu, Huaxuan, Liu, Jianglai, Ma, Yugang, Mao, Yajun, Meng, Yue, Ni, Kaixiang, Ning, Jinhua, Ning, Xuyang, Ren, Xiangxiang, Shang, Changsong, Si, Lin, Shen, Guofang, Tan, Andi, Wang, Anqing, Wang, Hongwei, Wang, Meng, Wang, Qiuhong, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wu, Mengmeng, Wu, Shiyong, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xie, Pengwei, Yan, Binbin, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Yue, Jianfeng, Zeng, Xinning, Zhang, Dan, Zhang, Tao, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng

论文摘要

我们已经开发了一种低能电子后坐力（ER）校准方法，其中$^{220} $ rn用于Pandax-II检测器。 $^{220} $ rn，从天然thoremiunds中发出，通过Xenon纯化系统被送入检测器。从2017年到2019年，我们进行了三个专门的校准活动，并具有不同的ra源。我们研究了检测器对$α$，$β$和$γ$颗粒的响应，重点是低能ER事件。在2017年和2018年的运行期间，$^{222} $ rn的放射性量为$^{220} $ rn和thor颗粒物污染的订单的1 \％可忽略不可注射。 $^{220} $ rn和$^{222} $ rn的校准策略将在即将进行的Pandax-4T实验中实现，并且对于其他基于Xenon的检测器也很有用。

We have developed a low-energy electron recoil (ER) calibration method with $^{220}$Rn for the PandaX-II detector. $^{220}$Rn, emanated from natural thorium compounds, was fed into the detector through the xenon purification system. From 2017 to 2019, we performed three dedicated calibration campaigns with different radon sources. We studied the detector response to $α$, $β$, and $γ$ particles with focus on low energy ER events. During the runs in 2017 and 2018, the amount of radioactivity of $^{222}$Rn were on the order of 1\% of that of $^{220}$Rn and thorium particulate contamination was negligible, especially in 2018. We also measured the background contribution from $^{214}$Pb for the first time in PandaX-II with the help from a $^{222}$Rn injection. Calibration strategy with $^{220}$Rn and $^{222}$Rn will be implemented in the upcoming PandaX-4T experiment and can be useful for other xenon-based detectors as well.

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