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Entropy of Field Interacting With Two Atoms in Bell State

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Communications in Theoretical Physics 2009年第1期51卷 53-56页

作者： jiao zhi-yong ma jun-mao li ning fu xia College of Physics Science and Technology China University of Petroleum （East China） Dongying 257061 China

In this paper, we investigate entropy properties of the single-mode coherent optical field interacting with the two two-level atoms initially in one of the four Bell states. It is found that the different initial states of the two atoms lead to different evolutions of field entropy and the intensity of the field plays an important role for the evolution properties of field entropy.

关键词： entropy optical field two-level atom Bell state entanglement

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强磁场中氢分子离子零点振动能的计算

中国石油大学学报（自然科学版） 2008年第4期32卷 161-164页

作者：焦志勇王英霞郭淑梅李宁马军贸付霞中国石油大学物理科学与技术学院山东东营257061 朝阳市财经学校辽宁朝阳122000

采用绝热近似和绝热变分近似两种方法，计算了强磁场（10≤β≤1000）中H2＋的σg，πu，δg，φu，γg，ηu态的能量和平衡核间距，并选取σg，δg，γg这3个态的能量和平衡核间距的数据进行曲线拟合，得出了曲线方程。典型的双原子分... 详细信息

采用绝热近似和绝热变分近似两种方法，计算了强磁场（10≤β≤1000）中H2＋的σg，πu，δg，φu，γg，ηu态的能量和平衡核间距，并选取σg，δg，γg这3个态的能量和平衡核间距的数据进行曲线拟合，得出了曲线方程。典型的双原子分子中两原子间相互作用势能曲线在平衡位置R0附近时曲线形状与简谐振子的势能曲线十分接近，据此计算得到了Hf的零点振动能，并对零点振动能做出了E～β曲线，最后分析给出了Hf的零点振动能与磁感应强度卢的关系，并且将基态的零点振动能在强磁场和无外场的情况下进行了比较。结果表明，Hf的零点振动能受场强影响明显，外加磁场越强，H2＋的零点振动能越小。

关键词：零点振动能强磁场绝热近似绝热变分近似曲线拟合

Determination of Double Beta Decay Half-life of 136Xe with the PandaX-4T Natural Xenon Detector

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Research 2023年第2期2022卷 33-41页

作者： lin Si Zhaokan Cheng Abdusalam Abdukerim Zihao Bo Wei Chen Xun Chen Yunhua Chen Chen Cheng Yunshan Cheng xiangyi Cui Yingjie Fan Deqing Fang Changbo fu Mengting fu lisheng Geng Karl Giboni linhui Gu Xuyuan Guo Ke Han Changda He Jinrong He Di Huang Yanlin Huang Zhou Huang Ruquan Hou xiangdong Ji yonglin Ju Chenxiang li Jiafu li Mingchuan li Shu li Shuaijie li Qing lin Jianglai liu xiaoying Lu lingyin Luo Yunyang Luo Wenbo ma Yugang ma Yujun mao Yue Meng Nasir Shaheed xiaofeng shang Xuyang ning ningchun Qi zhicheng Qian xiangxiang Ren Changsong shang Guofang Shen Wenliang Sun Andi Tan Yi tao Anqing Wang Meng Wang Qiuhong Wang Shaobo Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Yuehuan Wei Mengmeng Wu Weihao Wu Jingkai xia Mengjiao xiao xiang xiao Pengwei Xie Binbin Yan Xiyu Yan yong Yang Chunxu Yu Jumin Yuan Ying Yuan Zhe Yuan Dan Zhang Minzhen Zhang Peng Zhang Shibo Zhang Shu Zhang tao Zhang li Zhao Qibin Zheng Jifang Zhou ning Zhou xiaopeng Zhou yong Zhou IMOE Key Laboratory for Particle Astrophysics and Cosmology Shanghai Key Laboratory for Particle Physics and Cosmology School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Sichuan Research Institute Shanghai Jiao Tong UniversityChengdu 610213China Yalong River Hydropower Development Company Ltd.288 Shuanglin RoadChengdu 610051China School of Physics Sun Yat-sen UniversityGuangzhou 510275China Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao266237 ShandongChina Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityQingdao266237 ShandongChina Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China School of Physics Nankai UniversityTianjin 300071China Key Laboratory NuclearPyics and Ionampplication(MOE)Instituteof ModenPysics Fun Universty Shanghai 200433China School of Physics Peking UniversityBeijing 100871China Schol of Physics Beihang UniversityBejing 100191China International Research Center for Nuclei and Particles in the Cosmos Beijing key Laboratory of Advanced Nuclear materials and Physics Beihang UniversityBeijing 100191China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai200093China Department of Physics University of MarylandCollge ParkMaryland 20742USA School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratoryof Particle Detetion and Electronics University of Scienceand Technology of ChinaHefei230026China Department of Modern Physics University of Science and Technology of ChinaHefei230026China SJTU ParisElite Instute of Technology Shanghai Jiao Tong UniversityShanghai 200240China

Precise measurement of two-neutrino double beta decay(DBD)half-life is an important step for the searches of majorana neutrinos with neutrinoless double beta *** report the measurement of DBD half-life of 136xe using the Pandax-4T dual-phase Time Projection Chamber(TPC)with 3.7-tonne natural xenon and the first 94.9-day physics data release.

关键词： decay double Determination

Constraining self-interacting dark matter with the full dataset of PandaX-II

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Science China(Physics,Mechanics & Astronomy) 2021年第11期64卷 2-7页

作者： Jijun Yang Abdusalam Abdukerim Wei Chen Xun Chen Yunhua Chen Chen Cheng xiangyi Cui Yingjie Fan Deqing Fang Changbo fu Mengting fu lisheng Geng Karl Giboni linhui Gu Xuyuan Guo Ke Han Changda He Shengming He Di Huang Yan Huang Ran Huo Yanlin Huang Zhou Huang xiangdong Ji yonglin Ju Shuaijie li Qing lin Huaxuan liu Jianglai liu xiaoying Lu Wenbo ma Yugang ma Yajun mao Yue Meng Nasir Shaheed Kaixiang Ni Jinhua ning Xuyang ning xiangxiang Ren Changsong shang Guofang Shen lin Si Andi Tan Anqing Wang Hongwei Wang Meng Wang QiuHong Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Mengmeng Wu Shiyong Wu Weihao Wu Jingkai xia Mengjiao xiao xiang xiao Pengwei Xie Binbin Yan yong Yang Chunxu Yu Hai-Bo Yu Jumin Yuan Ying Yuan Xinning Zeng Dan Zhang tao Zhang li Zhao Qibin Zheng Jifang Zhou ning Zhou xiaopeng Zhou School of Physics and Astronomy Shanghai Jiao Tong UniversityMOE Key Laboratory for Particle Astrophysics and CosmologyShanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China shanghai jiao Tong University Sichuan Research Institude Chengdu 610213China Yalong River Hydropower Development Company Ltd.Chengdu 610051China School of Physics Sun Yat-sen UniversityGaungzhou 510275China Tsung-Dao Lee Institute Shanghai 200240China School of Physics Nankai UniversityTianjin 300071China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Peking UniversityBeijing 100871China School of Physics Beihang UniversityBeijing 100191China International Research Center for Nuclei and Particles in the Cosmos&Beijing Key Laboratory of Advanced Nuclear materials and Physics Beihang UniversityBeijing 100191China Shandong Institute of Advanced Technology Jinan 250103China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Physics University of MarylandCollege ParkMaryland 20742USA School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityJinan 250100China Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Department of Physics and Astronomy University of CaliforniaRiversideCalifornia 92507USA Center of High Energy Physics Peking UniversityBeijing 100871China

Self-interacting dark matter(SIDM)is a leading candidate proposed to solve discrepancies between predictions of the prevailing cold dark matter theory and observations of *** SIDM models predict the existence of a light force carrier that mediates strong dark matter *** the mediator couples to the standard model particles,it could produce characteristic signals in dark matter direct detection *** report searches for signals of SIDM models with a light mediator using the full dataset of the PandaX-II experiment,basing on a total exposure of 132 *** significant excess over background is found,and our likelihood analysis leads to a strong upper limit on the dark matter-nucleon coupling *** further combine the PandaX-II constraints and those from observations of the light element abundances in the early universe,and show that direct detection and cosmological probes can provide complementary constraints on dark matter models with a light mediator.

关键词： dark matter direct detection self-interacting dark matter

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An improved evaluation of the neutron background in the PandaX-Ⅱ experiment

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Science China(Physics,Mechanics & Astronomy) 2020年第3期63卷 54-63页

作者： 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 shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China INPAC and School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai Laboratory for Particle Physics and CosmologyShanghai 200240China Yalong River Hydropower Development Company Ltd.Chengdu 610051China School of Physics Nankai UniversityTianjin 300071China School of Physics&International Research Center for Nuclei and Particles in the Cosmos&Beijing Key Laboratory of Advanced Nuclear materials and Physics Beihang UniversityBeijing 100191China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Tsung-Dao Lee Institute Shanghai 200240China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Physics Peking UniversityBeijing 100871China Department of Physics University of MarylandCollege ParkMaryland 20742USA School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE) Shandong UniversityJinan 250100China Center of High Energy Physics Peking UniversityBeijing 100871China University of Chinese Academy of Sciences Beijing 100049China

In dark matter direct detection experiments,neutron is a serious source of background,which can mimic the dark matter-nucleus scattering *** this paper,we present an improved evaluation of the neutron background in the PandaX-II dark matter experiment by a novel *** of fully relying on the Monte Carlo simulation,the overall neutron background is determined from the neutron-induced high energy signals in the *** 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 *** 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.

关键词： dark matter direct detection xenon neutron background high energy gamma neutron generator

A Search for Solar Axions and Anomalous Neutrino magnetic Moment with the Complete Panda X-Ⅱ Data

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Chinese Physics Letters 2021年第1期38卷 30-34页

作者： xiaopeng Zhou Xinning Zeng Xuyang ning Abdusalam Abdukerim Wei Chen Xun Chen Yunhua Chen Chen Cheng xiangyi Cui Yingjie Fan Deqing Fang Changbo fu Mengting fu lisheng Geng Karl Giboni linhui Gu Xuyuan Guo Ke Han Changda He Di Huang Yan Huang Yanlin Huang Zhou Huang xiangdong Ji yonglin Ju Shuaijie li Huaxuan liu Jianglai liu xiaoying Lu Wenbo ma Yugang ma Yajun mao Yue Meng Kaixiang Ni Jinhua ning xiangxiang Ren Changsong shang Guofang Shen lin Si Andi Tan Anqing Wang Hongwei Wang Meng Wang Qiuhong Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Mengmeng Wu Shiyong Wu Weihao Wu Jingkai xia Mengjiao xiao Pengwei Xie Binbin Yan Jijun Yang yong Yang Chunxu Yu Jumin Yuan Ying Yuan Dan Zhang tao Zhang li Zhao Qibin Zheng Jifang Zhou ning Zhou INPAC School of Physics and AstronomyShanghai Jiao Tong Universityand Shanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China School of Physics Beihang UniversityBeijing 100191China shanghai jiao Tong University Sichuan Research Institute Chengdu 610213China Yalong River Hydropower Development Company Ltd.288 Shuanglin RoadChengdu 610051China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China School of Physics Nankai UniversityTianjin 300071China Key Laboratory of Nuclear Physics and Ion-Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Peking UniversityBeijing 100871China International Research Center for Nuclei and Particles in the Cosmos&Beijing Key Laboratory of Advanced Nuclear materials and Physics Beihang UniversityBeijing 100191China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Physics University of MarylandCollege ParkMaryland 20742USA School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE) Shandong UniversityJinan 250100China shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Center for High Energy Physics Peking UniversityBeijing 100871China

We report a search for new physics signals using the low energy electron recoil events in the complete data set from PandaX-Ⅱ,in light of the recent event excess reported by XENON1 *** data correspond to a total exposure of 100.7 ton·day with liquid *** robust estimates of the dominant background spectra,we perform sensitive searches on solar axions and neutrinos with enhanced magnetic *** is found that the axionelectron coupling gAemass less than 0.1 keV/c^(2) and the neutrino magnetic moment μv<4.9×10^(-11)μB at 90%confidence *** observed excess from XENON1 T is within our experimental constraints.

关键词： moment. excess estimates

Results of dark matter search using the full PandaX-Ⅱ exposure

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Chinese Physics C 2020年第12期44卷 184-200页

作者： Qiuhong Wang Abdusalam Abdukerim Wei Chen Xun Chen Yunhua Chen Chen Cheng xiangyi Cui Yingjie Fan Deqing Fang Changbo fu Mengting fu lisheng Geng Karl Giboni linhui Gu Xuyuan Guo Ke Han Changda He Di Huang Yan Huang Yanlin Huang Zhou Huang xiangdong Ji yonglin Ju Shuaijie li Huaxuan liu Jianglai liu Wenbo ma Yugang ma Yajun mao Yue Meng Kaixiang Ni Jinhua ning Xuyang ning xiangxiang Ren Changsong shang lin Si Guofang Shen Andi Tan Anqing Wang Hongwei Wang Meng Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Mengmeng Wu Shiyong Wu Weihao Wu Jingkai xia Mengjiao xiao Pengwei Xie Binbin Yan Jijun Yang yong Yang Chunxu Yu Jumin Yuan Ying Yuan Xinning Zeng Dan Zhang tao Zhang li Zhao Qibin Zheng Jifang Zhou ning Zhou xiaopeng Zhou INPAC and School of Physics and Astronomy Shanghai Jiao Tong UniversityMOE Key Lab for Particle PhysicsAstrophysics and CosmologyShanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China shanghai jiao Tong University Sichuan Research Institute Chengdu 610213China Yalong River Hydropower Development Company Ltd.288 Shuanglin RoadChengdu 610051China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Tsung-Dao Lee Institute Shanghai 200240China School of Physics Nankai UniversityTianjin 300071China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Peking UniversityBeijing 100871China School of Physics Beihang UniversityBeijing 100191China International Research Center for Nuclei and Particles in the Cosmos&Beijing Key Laboratory of Advanced Nuclear materials and Physics Beihang UniversityBeijing 100191China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Physics University of MarylandCollege ParkMaryland 20742USA School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE) Shandong UniversityJinan 250100China shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Center for High Energy Physics Peking UniversityBeijing 100871China

We report the dark matter search results obtained using the full 132 ton·day exposure of the PandaX-II experiment,including all data from march 2016 to August *** significant excess of events is identified above the expected *** limits are set on the spin-independent dark matter-nucleon *** lowest 90%confidence level exclusion on the spin-independent cross section is 2.2×10−46 cm2 at a WIMP mass of 30 GeV/c2.

关键词： dark matter direct detection liquid xenon

Study of background from accidental coincidence signals in the PandaX-Ⅱexperiment

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Chinese Physics C 2022年第10期46卷 11-24页

作者： Abdusalam Abdukerim Wei Chen Xun Chen Yunhua Chen Chen Cheng xiangyi Cui Yingjie Fan Deqing Fang Changbo fu Mengting fu lisheng Geng Karl Giboni linhui Gu Xuyuan Guo Ke Han Changda He Di Huang Yan Huang Yanlin Huang Zhou Huang xiangdong Ji yonglin Ju Shuaijie li Huaxuan liu Jianglai liu Wenbo ma Yugang ma Yajun mao Yue Meng Kaixiang Ni Jinhua ning Xuyang ning xiangxiang Ren Changsong shang lin Si Guofang Shen Andi Tan Anqing Wang Hongwei Wang Meng Wang Qiuhong Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Mengmeng Wu Shiyong Wu Weihao Wu Jingkai xia Mengjiao xiao Pengwei Xie Binbin Yan Jijun Yang yong Yang Chunxu Yu Jumin Yuan Ying Yuan Xinning Zeng Dan Zhang tao Zhang li Zhao Qibin Zheng Jifang Zhou ning Zhou xiaopeng Zhou School of Physics and Astronomy Shanghai Jiao Tong UniversityMOE Key Laboratory for Particle Astrophysics and CosmologyShanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China shanghai jiao Tong University Sichuan Research Institute Chengdu 610213China Yalong River Hydropower Development Company Ltd.288 Shuanglin RoadChengdu 610051China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Tsung-Dao Lee Institute Shanghai 200240China School of Physics Nankai UniversityTianjin 300071China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Peking UniversityBeijing 100871China School of Physics Beihang UniversityBeijing 102206China Beijing Key Laboratory of Advanced Nuclear materials and Physics Beihang UniversityBeijing102206China School of Physics and Microelectronics Zhengzhou UniversityZhengzhouHenan 450001China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Physics University of MarylandCollege ParkMaryland 20742USA School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE) Shandong UniversityJinan 250100China shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Center for High Energy Physics Peking UniversityBeijing 100871China

Ⅰ.INTRODUCTION The direct detection of dark matter particles,especially the weakly interacting massive particles(WIMPs),is being actively carried out by a couple of experiments worldwide[1].In recent years,the PandaX-Ⅱ experiment located in the China Jinping Underground Laboratory(CJPL)[1-3],which uses the technology of dual phase liquid xenon time projection chambers(TPCs),has pushed the limits of the cross section between WIMPs and nucleons to a new level for most of the possible WIMP masses;other experiments of the same type are also being performed[4–10].

关键词： dark matter xenon detector background accidental coincidence machine learning

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

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Chinese Physics C 2022年第11期46卷 262-274页

作者： Zhou Huang Guofang Shen Qiuhong Wang Abdusalam Abdukerim Zihao Bo Wei Chen Xun Chen Yunhua Chen Chen Cheng Yunshan Cheng xiangyi Cui Yingjie Fan Deqing Fang Changbo fu Mengting fu lisheng Geng Karl Giboni linhui Gu Xuyuan Guo Chencheng Han Ke Han Changda He Jinrong He Di Huang Yanlin Huang Ruquan Hou xiangdong Ji yonglin Ju Chenxiang li Mingchuan li Shu li Shuaijie li Qing lin Jianglai liu xiaoying Lu lingyin Luo Wenbo ma Yugang ma Yajun mao Yue Meng Xuyang ning ningchun Qi zhicheng Qian xiangxiang Ren Nasir Shaheed Changsong shang lin Si Wenliang Sun Andi Tan Yi tao Anqing Wang Meng Wang Shaobo Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Mengmeng Wu Weihao Wu Jingkai xia Mengjiao xiao xiang xiao Pengwei Xie Binbin Yan Xiyu Yan Jijun Yang yong Yang Chunxu Yu Jumin Yuan Ying Yuan Dan Zhang Minzhen Zhang Peng Zhang tao Zhang li Zhao Qibin Zheng Jifang Zhou ning Zhou xiaopeng Zhou yong Zhou School of Physics and Astronomy Shanghai Jiao Tong UniversityKey Laboratory for Particle Astrophysics and Cosmology(MoE)Shanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China School of Physics Beihang UniversityBeijing 102206China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China shanghai jiao Tong University Sichuan Research Institute Chengdu 610213China Yalong River Hydropower Development Company Ltd.288 Shuanglin RoadChengdu 610051China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary SciencShandong UniversityQingdao 266237China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityQingdao 266237China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai200240China School of Physics Nankai UniversityTianjin 300071China School of Physics Peking UniversityBeijing 100871China Beijing Key Laboratory of Advanced Nuclear materials and Physics Beihang UniversityBeijing102206China School of Physics and Microelectronics Zhengzhou UniversityZhengzhouHenan 450001China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Physics University of MarylandCollege ParkMaryland 20742USA School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China SJTU Paris Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai200240China

Neutron-induced nuclear recoil background is critical to dark matter searches in the PandaX-4T liquid xenon *** this study,we investigate the features of neutron background in liquid xenon and evaluate its contribution in single scattering nuclear recoil events using three *** first method is fully based on Monte Carlo *** last two are data-driven methods that also use multiple scattering signals and high energy signals in the *** the PandaX-4T commissioning data with an exposure of 0.63 tonne-year,all these methods give a consistent result,i.e.,there are 1.15±0.57 neutron-induced backgrounds in the dark matter signal region within an approximated nuclear recoil energy window between 5 and 100 keV.

关键词： dark matter neutron background multiple scattering high energy gamma