| An improved evaluation of the neutron background in the PandaX-Ⅱ experiment |
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| 作者单位： | Shanghai Institute of Applied Physics;INPAC and School of Physics and Astronomy;Yalong River Hydropower Development Company;School of Physics;School of Physics&International Research Center for Nuclei and Particles in the Cosmos&Beijing Key Laboratory of Advanced Nuclear Materials and Physics;School of Medical Instrument and Food Engineering;Tsung-Dao Lee Institute;School of Mechanical Engineering;School of Physics;Department of Physics;School of Physics and Key Laboratory of Particle Physics and Particle Irradiation（MOE）;Center of High Energy Physics;University of Chinese Academy of Sciences |
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| 基金项目： | supported by the Double Top-class of Shanghai Jiao Tong University,the National Natural Science Foundation of China(Grant Nos.11435008,11505112,11525522,11775141,and 11755001);the Ministry of Science and Technology of China(Grant No.2016YFA0400301);the Office of Science and Technology,Shanghai Municipal Government(Grant Nos.11DZ2260700,16DZ2260200,and 18JC1410200);the Key Laboratory for Particle Physics,Astrophysics and Cosmology,Ministry of Education,for important support;the Chinese Academy of Sciences Center for Excellence in Particle Physics(CCEPP);Hongwen Foundation in Hong Kong;we thank the CJPL administration and the Yalong River Hydropower Development Company Ltd.for indispensable logistical support and other help. |
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| 摘 要： | 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)andγ(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±0.24)and(0.47±0.25)events,respectively.
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| 关 键 词： | DARK matter direct detection XENON NEUTRON BACKGROUND high energy GAMMA NEUTRON GENERATOR |
An improved evaluation of the neutron background in the PandaX-Ⅱ experiment |
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| Authors: | QiuHong Wang Abdusalam Abdukerim Wei Chen Xun Chen YunHua Chen XiangYi Cui YingJie Fan DeQing Fang ChangBo Fu LiSheng Geng Karl Giboni Franco Giuliani LinHui Gu XuYuan Guo Ke Han ChangDa He Di Huang Yan Huang YanLin Huang Zhou Huang Peng Ji XiangDong Ji YongLin Ju YiHui Lai Kun Liang HuaXuan Liu JiangLai Liu WenBo Ma YuGang Ma YaJun Mao Yue Meng Parinya Namwongsa KaiXiang Ni JinHua Ning XuYang Ning XiangXiang Ren ChangSong Shang Lin Si AnDi Tan AnQing Wang HongWei Wang Meng Wang SiGuang Wang XiuLi Wang Zhou Wang MengMeng Wu ShiYong Wu JingKai Xia MengJiao Xiao PengWei Xie BinBin Yan JiJun Yang Yong Yang ChunXu Yu Jumin Yuan Dan Zhang HongGuang Zhang Tao Zhang Li Zhao QiBin Zheng JiFang Zhou Ning Zhou XiaoPeng Zhou |
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| Abstract: | 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) andγ(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±0.24) and(0.47±0.25) events,respectively. |
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| Keywords: | dark matter direct detection xenon neutron background high energy gamma neutron generator |
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