中子引起的pandax-4T实验中的核后坐力背景

论文标题

中子引起的pandax-4T实验中的核后坐力背景

Neutron-induced nuclear recoil background in the PandaX-4T experiment

论文作者

Huang, Zhou, Shen, Guofang, Wang, Qiuhong, 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, Chencheng, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Yanlin, 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, Qian, Zhicheng, Ren, Xiangxiang, Shaheed, Nasir, Shang, Changsong, Si, Lin, Sun, Wenliang, Tan, Andi, Tao, Yi, Wang, Anqing, Wang, Meng, 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

论文摘要

中子诱导的核后坐力背景对于Pandax-4T液体氙气实验中的暗物质搜索至关重要。本文研究了液体氙气中中子背景的特征，并通过三种方法评估了它们在单个散射核后坐力事件中的贡献。第一种方法是完全基于蒙特卡洛模拟。最后两种是数据驱动的方法，它们也分别使用数据中的多个散射信号和高能信号。在暴露于0.63吨的Pandax-4T调试数据中，所有这些方法都始终如一地结果，即在5至100 keV之间，在近似核后线能量窗口内有$ 1.15 \ pm0.57 $中子诱导的暗物质信号区域中的中子背景。

Neutron-induced nuclear recoil background is critical to the dark matter searches in the PandaX-4T liquid xenon experiment. This paper studies the feature of neutron background in liquid xenon and evaluates their contribution in the single scattering nuclear recoil events through three methods. The first method is fully Monte Carlo simulation based. The last two are data-driven methods that also use the multiple scattering signals and high energy signals in the data, respectively. In the PandaX-4T commissioning data with an exposure of 0.63 tonne-year, all these methods give a consistent result that there are $1.15\pm0.57$ neutron-induced background in dark matter signal region within an approximated nuclear recoil energy window between 5 and 100 keV.

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