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An Improved Evaluation of the Neutron Background in the PandaX-II Experiment

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Main Authors:	Wang, Qiuhong, Abdukerim, Abdusalam, Chen, Wei, Chen, Xun, Chen, Yunhua, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Geng, Lisheng, Giboni, Karl, Giuliani, Franco, Gu, Linhui, Guo, Xuyuan, Han, Ke, He, Changda, Huang, Di, Huang, Yan, Huang, Yanlin, Huang, Zhou, Ji, Peng, Ji, Xiangdong, Ju, Yonglin, Lai, Yihui, Liang, Kun, Liu, Huaxuan, Liu, Jianglai, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Namwongsa, Parinya, Ni, Kaixiang, Ning, Jinhua, Ning, Xuyang, Ren, Xiangxiang, Shang, Changsong, Si, Lin, Tan, Andi, Wang, Anqing, Wang, Hongwei, Wang, Meng, Wang, Siguang, Wang, Xiuli, Wang, Zhou, Wu, Mengmeng, Wu, Shiyong, Xia, Jingkai, Xiao, Mengjiao, Xie, Pengwei, Yan, Binbin, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Zhang, Dan, Zhang, Hongguang, Zhang, Tao, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng
Format:	Preprint
Published:	2019
Subjects:	High Energy Physics - Experiment Nuclear Experiment Instrumentation and Detectors
Online Access:	Acceder al recurso
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_version_	1866910707449069568
author	Wang, Qiuhong Abdukerim, Abdusalam Chen, Wei Chen, Xun Chen, Yunhua Cui, Xiangyi Fan, Yingjie Fang, Deqing Fu, Changbo Geng, Lisheng Giboni, Karl Giuliani, Franco Gu, Linhui Guo, Xuyuan Han, Ke He, Changda Huang, Di Huang, Yan Huang, Yanlin Huang, Zhou Ji, Peng Ji, Xiangdong Ju, Yonglin Lai, Yihui Liang, Kun Liu, Huaxuan Liu, Jianglai Ma, Wenbo Ma, Yugang Mao, Yajun Meng, Yue Namwongsa, Parinya Ni, Kaixiang Ning, Jinhua Ning, Xuyang Ren, Xiangxiang Shang, Changsong Si, Lin Tan, Andi Wang, Anqing Wang, Hongwei Wang, Meng Wang, Siguang Wang, Xiuli Wang, Zhou Wu, Mengmeng Wu, Shiyong Xia, Jingkai Xiao, Mengjiao Xie, Pengwei Yan, Binbin Yang, Jijun Yang, Yong Yu, Chunxu Yuan, Jumin Zhang, Dan Zhang, Hongguang Zhang, Tao Zhao, Li Zheng, Qibin Zhou, Jifang Zhou, Ning Zhou, Xiaopeng
author_facet	Wang, Qiuhong Abdukerim, Abdusalam Chen, Wei Chen, Xun Chen, Yunhua Cui, Xiangyi Fan, Yingjie Fang, Deqing Fu, Changbo Geng, Lisheng Giboni, Karl Giuliani, Franco Gu, Linhui Guo, Xuyuan Han, Ke He, Changda Huang, Di Huang, Yan Huang, Yanlin Huang, Zhou Ji, Peng Ji, Xiangdong Ju, Yonglin Lai, Yihui Liang, Kun Liu, Huaxuan Liu, Jianglai Ma, Wenbo Ma, Yugang Mao, Yajun Meng, Yue Namwongsa, Parinya Ni, Kaixiang Ning, Jinhua Ning, Xuyang Ren, Xiangxiang Shang, Changsong Si, Lin Tan, Andi Wang, Anqing Wang, Hongwei Wang, Meng Wang, Siguang Wang, Xiuli Wang, Zhou Wu, Mengmeng Wu, Shiyong Xia, Jingkai Xiao, Mengjiao Xie, Pengwei Yan, Binbin Yang, Jijun Yang, Yong Yu, Chunxu Yuan, Jumin Zhang, Dan Zhang, Hongguang Zhang, Tao Zhao, Li Zheng, Qibin Zhou, Jifang Zhou, Ning Zhou, Xiaopeng
contents	In dark matter direct detection experiments, neutron is a serious source of background, which can mimic the dark matter-nucleus scattering signals. In this paper, we present an improved evaluation of the neutron background in the PandaX-II dark matter experiment by a novel approach. Instead of fully relying on the Monte Carlo simulation, the overall neutron background is determined from the neutron-induced high energy signals in the data. In addition, the probability of producing a dark-matter-like background per neutron is evaluated with a complete Monte Carlo generator, where the correlated emission of neutron(s) and $γ$(s) in the ($α$, n) reactions and spontaneous fissions is taken into consideration. With this method, the neutron backgrounds in the Run 9 (26-ton-day) and Run 10 (28-ton-day) data sets of PandaX-II are estimated to be 0.66$\pm$0.24 and 0.47$\pm$0.25 events, respectively.
format	Preprint
id	arxiv_https___arxiv_org_abs_1907_00545
institution	arXiv
publishDate	2019
record_format	arxiv
spellingShingle	An Improved Evaluation of the Neutron Background in the PandaX-II Experiment Wang, Qiuhong Abdukerim, Abdusalam Chen, Wei Chen, Xun Chen, Yunhua Cui, Xiangyi Fan, Yingjie Fang, Deqing Fu, Changbo Geng, Lisheng Giboni, Karl Giuliani, Franco Gu, Linhui Guo, Xuyuan Han, Ke He, Changda Huang, Di Huang, Yan Huang, Yanlin Huang, Zhou Ji, Peng Ji, Xiangdong Ju, Yonglin Lai, Yihui Liang, Kun Liu, Huaxuan Liu, Jianglai Ma, Wenbo Ma, Yugang Mao, Yajun Meng, Yue Namwongsa, Parinya Ni, Kaixiang Ning, Jinhua Ning, Xuyang Ren, Xiangxiang Shang, Changsong Si, Lin Tan, Andi Wang, Anqing Wang, Hongwei Wang, Meng Wang, Siguang Wang, Xiuli Wang, Zhou Wu, Mengmeng Wu, Shiyong Xia, Jingkai Xiao, Mengjiao Xie, Pengwei Yan, Binbin Yang, Jijun Yang, Yong Yu, Chunxu Yuan, Jumin Zhang, Dan Zhang, Hongguang Zhang, Tao Zhao, Li Zheng, Qibin Zhou, Jifang Zhou, Ning Zhou, Xiaopeng High Energy Physics - Experiment Nuclear Experiment Instrumentation and Detectors In dark matter direct detection experiments, neutron is a serious source of background, which can mimic the dark matter-nucleus scattering signals. In this paper, we present an improved evaluation of the neutron background in the PandaX-II dark matter experiment by a novel approach. Instead of fully relying on the Monte Carlo simulation, the overall neutron background is determined from the neutron-induced high energy signals in the data. In addition, the probability of producing a dark-matter-like background per neutron is evaluated with a complete Monte Carlo generator, where the correlated emission of neutron(s) and $γ$(s) in the ($α$, n) reactions and spontaneous fissions is taken into consideration. With this method, the neutron backgrounds in the Run 9 (26-ton-day) and Run 10 (28-ton-day) data sets of PandaX-II are estimated to be 0.66$\pm$0.24 and 0.47$\pm$0.25 events, respectively.
title	An Improved Evaluation of the Neutron Background in the PandaX-II Experiment
topic	High Energy Physics - Experiment Nuclear Experiment Instrumentation and Detectors
url	https://arxiv.org/abs/1907.00545