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1. Low radioactive material screening and background control for the PandaX-4T experiment

Author

The PandaX-4T collaboration, Zhicheng Qian, Lin Si, 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, 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, Xiangxiang Ren, Nasir Shaheed, 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, 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, and Yong Zhou

Subjects
Dark Matter and Double Beta Decay (experiments), Rare Decay, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract PandaX-4T is a ton-scale dark matter direct detection experiment using a dual-phase TPC technique at the China Jinping Underground Laboratory. Various ultra-low background technologies have been developed and applied to material screening for PandaX-4T, including HPGe gamma spectroscopy, ICP-MS, NAA, radon emanation measurement system, krypton assay station, and alpha detection system. Low background materials were selected to assemble the detector. Surface treatment procedures were investigated to further suppress radioactive background. Combining measured results and Monte Carlo simulation, the total material background rates of PandaX-4T in the energy region of 1–25 keVee are estimated to be (9.9 ± 1.9) × 10 −3 mDRU for electron recoil and (2.8 ± 0.6) × 10 −4 mDRU for nuclear recoil. In addition, natKr in the detector is estimated to be < 8 ppt.

Published
2022
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2. Constraints on the axial-vector and pseudo-scalar mediated WIMP-nucleus interactions from PandaX-4T experiment

Author

Zhou Huang, Chencheng Han, Abdusalam Abdukerim, Zihao Bo, Wei Chen, Xun Chen, Yunhua Chen, Chen Cheng, Zhaokan 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, 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, Yajun Mao, Yue Meng, Xuyang Ning, Ningchun Qi, Zhicheng Qian, Xiangxiang Ren, Nasir Shaheed, Changsong Shang, Xiaofeng Shang, Guofang Shen, Lin Si, 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, Jijun Yang, Yong Yang, Chunxu Yu, Jumin Yuan, Zhe Yuan, Xinning Zeng, Dan Zhang, Minzhen Zhang, Peng Zhang, Shibo Zhang, Shu Zhang, Tao Zhang, Yingxin Zhang, Yuanyuan Zhang, Li Zhao, Qibin Zheng, Jifang Zhou, Ning Zhou, Xiaopeng Zhou, Yong Zhou, and Yubo Zhou

Subjects
Dark matter, Mediator, Axial-vector, Pseudo-scalar, Physics, QC1-999
Abstract

We present the constraints on the axial-vector and pseudo-scalar mediated WIMP-nucleus interactions from the PandaX-4T experiment, using the data set corresponding to a total exposure of 0.63 tonne⋅year. No significant signal excess is observed, and the most stringent constraints to date on the mediator mass are set for the axial-vector and pseudo-scalar simplified models. The maximum excluded mass of an axial-vector mediator is 825 GeV/c2 and that of a pseudo-scalar mediator is 106 GeV/c2. In addition, the upper limits on the spin-dependent WIMP-nucleon scattering cross-section for conventional neutron-only and proton-only interactions are derived.

Published
2022
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3. A search for two-component Majorana dark matter in a simplified model using the full exposure data of PandaX-II experiment

Author

Ying Yuan, Abdusalam Abdukerim, Zihao Bo, 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, Jinrong He, Di Huang, Yanlin Huang, Zhou 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, Nasir Shaheed, Xuyang Ning, Ningchun Qi, Zhicheng Qian, Xiangxiang Ren, Changsong Shang, Guofang Shen, Lin Si, Wenliang Sun, Andi Tan, Yi Tao, Anqing Wang, Meng Wang, Qiuhong 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, Dan Zhang, Minzhen Zhang, Peng Zhang, Tao Zhang, Li Zhao, Qibin Zheng, Jifang Zhou, Ning Zhou, Xiaopeng Zhou, and Yong Zhou

Subjects
Two-component Majorana dark matter, Simplified model, Direct detection, Physics, QC1-999
Abstract

In the two-component Majorana dark matter model, one dark matter particle can scatter off the target nuclei, and turn into a slightly heavier component. In the framework of a simplified model with a vector boson mediator, both the tree-level and loop-level processes contribute to the signal in direct detection experiment. In this paper, we report the search results for such dark matter from PandaX-II experiment, using total data of the full 100.7 tonne⋅day exposure. No significant excess is observed, so strong constraints on the combined parameter space of mediator mass and dark matter mass are derived. With the complementary search results from collider experiments, a large range of parameter space can be excluded.

Published
2022
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4. Determination of Double Beta Decay Half-Life of 136Xe with the PandaX-4T Natural Xenon Detector

Author

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, Yajun 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, Jijun Yang, 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, and Yong Zhou

Subjects
Science
Abstract

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 decay. We 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. The background model in the fiducial volume is well constrained in situ by events in the outer active region. With a 136Xe exposure of 15.5 kg-year, we establish the half-life as 2.27±0.03stat.±0.10syst.×1021 years. This is the first DBD half-life measurement with natural xenon and demonstrates the physics capability of a large-scale liquid xenon TPC in the field of rare event searches.

Published
2022
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5. First result from the Jinping Underground Nuclear Astrophysics experiment JUNA: precise measurement of the 92 keV 25Mg(p, γ)26Al resonance

Author

Jun Su, Hao Zhang, Zhihong Li, Paolo Ventura, Yunju Li, Ertao Li, Chen Chen, Yangping Shen, Gang Lian, Bing Guo, Xinyue Li, Liyong Zhang, Jianjun He, Yaode Sheng, Yinji Chen, Luohuan Wang, Long Zhang, Fuqiang Cao, Wei Nan, Weike Nan, Gexing Li, Na Song, Baoqun Cui, Lihua Chen, Ruigang Ma, Zhicheng Zhang, Taoyu Jiao, Bingshui Gao, Xiaodong Tang, Qi Wu, Jiaqing Li, Liangting Sun, Shuo Wang, Shengquan Yan, Junhui Liao, Youbao Wang, Sheng Zeng, Ding Nan, Qiwen Fan, Ningchun Qi, Wenliang Sun, Xuyuan Guo, Peng Zhang, Yunhua Chen, Yong Zhou, Jifang Zhou, Jinrong He, Changsong Shang, Mingchuan Li, Jianping Cheng, and Weiping Liu

Subjects
Nuclear physics, Physics, Reaction rate, Multidisciplinary, COSMIC cancer database, Nucleosynthesis, Nuclear astrophysics, China Jinping Underground Laboratory, Resonance, Ground state, Galaxy
Abstract

The 25Mg(p, γ )26Al reaction plays an important role in the study of cosmic 1.809 MeV γ -ray as a signature of ongoing nucleosynthesis in the Galaxy. At astrophysical temperature around 0.1 GK, the 25Mg(p, γ )26Al reaction rates are dominated by the 92 keV resonance capture process. We report a precise measurement of the 92 keV 25Mg(p, γ )26Al resonance in the day-one experiment at Jinping Underground Nuclear Astrophysics experiment (JUNA) facility in the China Jinping Underground Laboratory (CJPL). The resonance strength and ground state feeding factor are determined to be 3.8 ± 0.3 ×10−10 eV and 0.66 ± 0.04 , respectively. The results are in agreement with those reported in the previous direct underground measurement within uncertainty, but with significantly reduced uncertainties. Consequently, we recommend new 25Mg(p, γ )26Al reaction rates which are by a factor of 2.4 larger than those adopted in REACLIB database at the temperature around 0.1 GK. The new results indicate higher production rates of 26gAl and the cosmic 1.809 MeV γ -rays. The implication of the new rates for the understanding of other astrophysical situations is also discussed.

Published
2022
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6. PandaX-4T cryogenic distillation system for removing krypton from xenon

Author

Rui Yan, Zhou Wang, Xiangyi Cui, Yonglin Ju, Haidong Sha, Shuaijie Li, Peiyao Huang, Xiuli Wang, Wenbo Ma, Yingjie Fan, Li Zhao, Jianglai Liu, Xiangdong Ji, Jifang Zhou, Changsong Shang, and Liqiang Liu

Subjects
Instrumentation
Abstract

An efficient cryogenic distillation system was designed and constructed for the PandaX-4T dark matter detector based on the McCabe-Thiele method and the conservation of mass and energy. This distillation system is designed to reduce the concentration of krypton in commercial xenon from 5 × 10

Published
2022

7. Dark Matter Search Results from the PandaX-4T Commissioning Run

Author

Yue, Meng, Zhou, Wang, Yi, Tao, 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, Mingchuan, Li, Shu, Li, Shuaijie, Li, Qing, Lin, Jianglai, Liu, Xiaoying, Lu, Lingyin, Luo, Wenbo, Ma, Yugang, Ma, Yajun, Mao, Nasir, Shaheed, Xuyang, Ning, Ningchun, Qi, Zhicheng, Qian, Xiangxiang, Ren, Changsong, Shang, Guofang, Shen, Lin, Si, Wenliang, Sun, Andi, Tan, Anqing, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, 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, and Yong, Zhou

Subjects
High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, General Physics and Astronomy, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment, High Energy Physics - Experiment
Abstract

We report the first dark matter search results using the commissioning data from PandaX-4T. Using a time projection chamber with 3.7-tonne of liquid xenon target and an exposure of 0.63 tonne$\cdot$year, 1058 candidate events are identified within an approximate nuclear recoil energy window between 5 and 100 keV. No significant excess over background is observed. Our data set a stringent limit to the dark matter-nucleon spin-independent interactions, with a lowest excluded cross section (90% C.L.) of $3.8\times10^{-47} $cm$^2$ at a dark matter mass of 30 GeV/$c^2$., Comment: proof draft as PRL

Published
2021
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8. Constraining self-interacting dark matter with the full dataset of PandaX-II

Author

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

Subjects
Physics, Cold dark matter, Self-interacting dark matter, media_common.quotation_subject, Dark matter, FOS: Physical sciences, General Physics and Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Galaxy, Universe, High Energy Physics - Experiment, Standard Model, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), Force carrier, High Energy Physics - Phenomenology (hep-ph), PandaX, media_common
Abstract

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 galaxies. Many SIDM models predict the existence of a light force carrier that mediate strong dark matter self-interactions. If the mediator couples to the standard model particles, it could produce characteristic signals in dark matter direct detection experiments. We report searches for SIDM models with a light mediator using the full dataset of the PandaX-II experiment, based on a total exposure of 132 tonne-days. No significant excess over background is found, and our likelihood analysis leads to a strong upper limit on the dark matter-nucleon coupling strength. We 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., Comment: 5 pages, 5 figures

Published
2021
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9. First result from the Jinping Underground Nuclear Astrophysics experiment JUNA: precise measurement of the 92 keV

Author

Jun, Su, Hao, Zhang, Zhihong, Li, Paolo, Ventura, Yunju, Li, Ertao, Li, Chen, Chen, Yangping, Shen, Gang, Lian, Bing, Guo, Xinyue, Li, Liyong, Zhang, Jianjun, He, Yaode, Sheng, Yinji, Chen, Luohuan, Wang, Long, Zhang, Fuqiang, Cao, Wei, Nan, Weike, Nan, Gexing, Li, Na, Song, Baoqun, Cui, Lihua, Chen, Ruigang, Ma, Zhicheng, Zhang, Taoyu, Jiao, Bingshui, Gao, Xiaodong, Tang, Qi, Wu, Jiaqing, Li, Liangting, Sun, Shuo, Wang, Shengquan, Yan, Junhui, Liao, Youbao, Wang, Sheng, Zeng, Ding, Nan, Qiwen, Fan, Ningchun, Qi, Wenliang, Sun, Xuyuan, Guo, Peng, Zhang, Yunhua, Chen, Yong, Zhou, Jifang, Zhou, Jinrong, He, Changsong, Shang, Mingchuan, Li, Jianping, Cheng, and Weiping, Liu

Abstract

The

Published
2021

10. Search for Light Dark Matter–Electron Scattering in the PandaX-II Experiment

Author

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

Subjects
Physics, Range (particle radiation), Dark matter, FOS: Physical sciences, General Physics and Astronomy, chemistry.chemical_element, Electron, Photoelectric effect, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Xenon, chemistry, Ionization, 0103 physical sciences, 010306 general physics, Electron scattering, Light dark matter
Abstract

We report constraints on light dark matter through its interactions with shell electrons in the PandaX-II liquid xenon detector with a total 46.9 tonne$\cdot$day exposure. To effectively search for these very low energy electron recoils, ionization-only signals are selected from the data. 1821 candidates are identified within ionization signal range between 50 to 75 photoelectrons, corresponding to a mean electronic recoil energy from 0.08 to 0.15 keV. The 90% C.L. exclusion limit on the scattering cross section between the dark matter and electron is calculated based on Poisson statistics. Under the assumption of point interaction, we provide the world's most stringent limit within the dark matter mass range from 15 to 30 $\rm MeV/c^2$, with the corresponding cross section from $2.5\times10^{-37}$ to $3.1\times10^{-38}$ cm$^2$., 6 pages, 5 figures, 2 tables

Published
2021
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11. Determination of responses of liquid xenon to low energy electron and nuclear recoils using the PandaX-II detector

Author

Binbin Yan, 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, Peiyao Huang, Yan Huang, Yanlin Huang, Zhou Huang, Xiangdong Ji, Yonglin Ju, Shuaijie Li, Jianglai Liu, Zhuoqun Lei, 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, Rui Yan, Jijun Yang, Yong Yang, Chunxu Yu, Jumin Yuan, Ying Yuan, Jianfeng Yue, Xinning Zeng, Dan Zhang, Tao Zhang, Li Zhao, Qibin Zheng, Jifang Zhou, Ning Zhou, Xiaopeng Zhou, and null (PandaX-II Collaboration)

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Physics - Instrumentation and Detectors, Time projection chamber, Physics::Instrumentation and Detectors, Detector, chemistry.chemical_element, FOS: Physical sciences, Astronomy and Astrophysics, Electron, Instrumentation and Detectors (physics.ins-det), High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Recoil, Xenon, chemistry, Yield (chemistry), Neutron source, Instrumentation
Abstract

We report a systematic determination of the responses of PandaX-II, a dual phase xenon time projection chamber detector, to low energy recoils. The electron recoil (ER) and nuclear recoil (NR) responses are calibrated, respectively, with injected tritiated methane or $^{220}$Rn source, and with $^{241}$Am-Be neutron source, within an energy range from $1-25$ keV (ER) and $4-80$ keV (NR), under the two drift fields of 400 and 317 V/cm. An empirical model is used to fit the light yield and charge yield for both types of recoils. The best fit models can well describe the calibration data. The systematic uncertainties of the fitted models are obtained via statistical comparison against the data., Comment: 12 pages, 7 figures

Published
2021
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12. Commissioning of Underground Nuclear Astrophysics Experiment JUNA in China

Author

Weiping Liu, Zhihong Li, Jianjun He, Xiaodong Tang, Gang Lian, Jun Su, Yangping Shen, Zhu An, Fuqiang Chao, Jianjun Chang, Lihua Chen, Han Chen, Xiongjun Chen, Yunhua Chen, Zhijun Chen, Jianping Cheng, Baoqun Cui, Xiao Fang, Changbo Fu, Lin Gan, Bing Guo, Zhiyu Han, Xuyuan Guo, Guozhu He, Jinrong He, Alexander Heger, Suqing Hou, Hanxiong Huang, Ning Huang, Baolu Jia, Liyang Jiang, Shigeru Kubono, Jianmin Li, Mingchuan Li, Kuoang Li, Ertao Li, Tao Li, Yunju Li, Maria Lugaro, Xiaobing Luo, Hongyi Ma, Shaobo Ma, Dongming Mei, Wei Nan, Weike Nan, Ningchun Qi, Yongzhong Qian, Jiuchang Qin, Jie Ren, Changsong Shang, Liangting Sun, Wenliang Sun, Wanpeng Tan, Isao Tanihata, Shuo Wang, Peng Wang, Youbao Wang, Qi Wu, Shiwei Xu, Yao Yang, Xiangqing Yu, Qian Yue, Sheng Zeng, Long Zhang, Hao Zhang, Huanyu Zhang, Liyong Zhang, Ningtao Zhang, Peng Zhang, Qiwei Zhang, Tao Zhang, Xiaopeng Zhang, Xuezhen Zhang, Wei Zhao, Jifang Zhou, and Yong Zhou

Abstract

Underground Nuclear Astrophysics Experiment in China (JUNA) has been commissioned by taking the advantage of the ultra-low background in Jinping underground lab. High current mA level 400 KV accelerator with an ECR source and BGO detectors were commissioned. JUNA studies directly a number of nuclear reactions important to hydrostatic stellar evolution at their relevant stellar energies. In the first quarter of 2021, JUNA performed the direct measurements of 25Mg(p,γ)26Al, 19F(p,α)16O, 13C(α,n)16O and 12C(α,γ)16O near the Gamow window. The experimental results reflect the potential of JUNA with higher statistics, precision and sensitivity of the data. The preliminary results of JUNA experiment and future plan are given.

Published
2022
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13. Erratum: A Search for Solar Axions and Anomalous Neutrino Magnetic Moment with the Complete PandaX-II Data [CHIN. PHYS. LETT. 38 (2021) 011301]

Author

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

Subjects
Physics, Particle physics, medicine.anatomical_structure, Magnetic moment, medicine, General Physics and Astronomy, PandaX, Neutrino, Axion, Chin
Published
2021
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14. Results of Dark Matter Search using the Full PandaX-II Exposure

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Dark matter, FOS: Physical sciences, Astronomy and Astrophysics, 01 natural sciences, Confidence interval, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Cross section (physics), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), WIMP, 0103 physical sciences, PandaX, 010306 general physics, Instrumentation, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We report the dark matter search results obtained using the full 132 ton$\cdot$day exposure of the PandaX-II experiment, including all data from March 2016 to August 2018. No significant excess of events is identified above the expected background. Upper limits are set on the spin-independent dark matter-nucleon interactions. The lowest 90% confidence level exclusion on the spin-independent cross section is $2.2\times 10^{-46}$ cm$^2$ at a WIMP mass of 30 GeV/$c^2$., Comment: 23 pages, 19 figures, 6 tables, version published in Chinese Physics C

Published
2020
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15. An improved evaluation of the neutron background in the PandaX-II experiment

Author

Yue Meng, Binbin Yan, Karl Giboni, Jingkai Xia, Peng Ji, Meng Wang, Mengmeng Wu, Li Zhao, Jianglai Liu, Zhou Huang, Wei Chen, Xiuli Wang, Yihui Lai, Tao Zhang, Huaxuan Liu, Yanlin Huang, Mengjiao Xiao, Abdusalam Abdukerim, Yunhua Chen, Deqing Fang, Li-Sheng Geng, Ning Zhou, Yingjie Fan, Changbo Fu, Linhui Gu, Anqing Wang, Xuyuan Guo, Chunxu Yu, Qiuhong Wang, Qibin Zheng, Yajun Mao, Kun Liang, Hongguang Zhang, Hongwei Wang, Xun Chen, Yan Huang, Jumin Yuan, Wenbo Ma, Changsong Shang, Jifang Zhou, Siguang Wang, Xiaopeng Zhou, Dan Zhang, Changda He, Jinhua Ning, Ke Han, Xiangxiang Ren, Jijun Yang, Shiyong Wu, Xiangdong Ji, Andi Tan, Yonglin Ju, Zhou Wang, Pengwei Xie, Lin Si, Di Huang, Kaixiang Ni, Franco Giuliani, Xuyang Ning, Parinya Namwongsa, Yong Yang, Yu-Gang Ma, and Xiangyi Cui

Subjects
inorganic chemicals, Physics, integumentary system, Scattering, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Monte Carlo method, Dark matter, technology, industry, and agriculture, General Physics and Astronomy, chemistry.chemical_element, 01 natural sciences, Nuclear physics, Xenon, chemistry, Neutron generator, biological sciences, 0103 physical sciences, lipids (amino acids, peptides, and proteins), Neutron, PandaX, Nuclear Experiment, 010306 general physics, 010303 astronomy & astrophysics
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) 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±0.24) and (0.47±0.25) events, respectively.

Published
2019
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16. Searching for Neutrino-less Double Beta Decay of $^{136}$Xe with PandaX-II Liquid Xenon Detector

Author

Linhui Gu, Anqing Wang, Jifang Zhou, Hongwei Wang, Jingkai Xia, Dan Zhang, Qibin Zheng, Jinhua Ning, Changda He, Yonglin Ju, Meng Wang, Yong Yang, Lin Si, Yue Meng, Tao Zhang, Yu-Gang Ma, Binbin Yan, Pengwei Xie, Xiuli Wang, Xun Chen, Yanlin Huang, Xiangyi Cui, Li-Sheng Geng, Ning Zhou, Siguang Wang, Wenbo Ma, Zhou Wang, Franco Giuliani, Karl Giboni, Peng Ji, Jijun Yang, Changbo Fu, Hongguang Zhang, Mengmeng Wu, Yihui Lai, Huaxuan Liu, Abdusalam Abdukerim, Li Zhao, Jianglai Liu, Xuyang Ning, Mengjiao Xiao, Yunhua Chen, Kun Liang, Changsong Shang, Xiaopeng Zhou, Shiyong Wu, Xiangdong Ji, Parinya Namwongsa, Deqing Fang, Ke Han, Yingjie Fan, Andi Tan, Chunxu Yu, Yan Huang, Di Huang, Kaixiang Ni, Qiuhong Wang, Xuyuan Guo, Yajun Mao, Xiangxiang Ren, Zhou Huang, Jumin Yuan, and Wei Chen

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Dark matter, chemistry.chemical_element, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Xenon, Double beta decay, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Instrumentation, Nuclear Experiment, Physics, Time projection chamber, 010308 nuclear & particles physics, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), MAJORANA, chemistry, PandaX, Neutrino, Energy (signal processing)
Abstract

We report the Neutrino-less Double Beta Decay (NLDBD) search results from PandaX-II dual-phase liquid xenon time projection chamber. The total live time used in this analysis is 403.1 days from June 2016 to August 2018. With NLDBD-optimized event selection criteria, we obtain a fiducial mass of 219 kg of natural xenon. The accumulated xenon exposure is 242 kg$\cdot$yr, or equivalently 22.2 kg$\cdot$yr of $^{136}$Xe exposure. At the region around $^{136}$Xe decay Q-value of 2458 keV, the energy resolution of PandaX-II is 4.2%. We find no evidence of NLDBD in PandaX-II and establish a lower limit for decay half-life of 2.4 $ \times 10^{23} $ yr at the 90% confidence level, which corresponds to an effective Majorana neutrino mass $m_{\beta \beta} < (1.3 - 3.5)$ eV. This is the first NLDBD result reported from a dual-phase xenon experiment., Comment: Submitted to Chinese Physics C

Published
2019

17. A Search for Solar Axions and Anomalous Neutrino Magnetic Moment with the Complete PandaX-II Data*

Author

Mengting Fu, Changbo Fu, Huaxuan Liu, Di Huang, Xiangxiang Ren, Kaixiang Ni, Dan Zhang, Changda He, Xiaoying Lu, S. Li, Pengwei Xie, Guofang Shen, Changsong Shang, Jinhua Ning, Xiaopeng Zhou, Linhui Gu, Meng Wang, Shiyong Wu, Xiangdong Ji, Andi Tan, Mengjiao Xiao, Xuyuan Guo, Jifang Zhou, Chen Cheng, Wenbo Ma, Ke Han(韩柯)$^{ hyperlink{s}{ }}$, Xun Chen, Jumin Yuan, Anqing Wang, Abdusalam Abdukerim, Wei Chen, Tao Zhang, Mengmeng Wu, Jingkai Xia, Yajun Mao, Xinning Zeng, Zhou Huang, Yonglin Ju, Jijun Yang, Yong Yang, Hongwei Wang, Yu-Gang Ma, Deqing Fang, Yingjie Fan, Weihao Wu, Yan Huang, Siguang Wang, Yanlin Huang, Qiuhong Wang, Lin Si, Xiangyi Cui, C. X. Yu, Zhou Wang, Qibin Zheng, Xuyang Ning, Yue Meng, Binbin Yan, Li-Sheng Geng, Ning Zhou, Ying Yuan, Karl Giboni, Xiuli Wang, Wei Wang, Li Zhao, Jianglai Liu, and Yunhua Chen

Subjects
Physics, Particle physics, Magnetic moment, Physics beyond the Standard Model, General Physics and Astronomy, chemistry.chemical_element, 02 engineering and technology, Electron, 021001 nanoscience & nanotechnology, Coupling (probability), 01 natural sciences, Recoil, Xenon, chemistry, 0103 physical sciences, Neutrino, 010306 general physics, 0210 nano-technology, Axion
Abstract

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 XENON1T. The data correspond to a total exposure of 100.7 ton⋅day with liquid xenon. With robust estimates of the dominant background spectra, we perform sensitive searches on solar axions and neutrinos with enhanced magnetic moment. It is found that the axion-electron coupling g Ae < 4.6 × 10–12 for an axion mass less than 0.1 keV/c 2 and the neutrino magnetic moment μν < 4.9 × 10–11 μ B at 90 % confidence level. The observed excess from XENON1T is within our experimental constraints.

Published
2021
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