摘要
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 August2018.With NLDBD-optimized event selection criteria,we obtain a fiducial mass of 219 kg of natural xenon.The accumulated xenon exposure is 242 kg yr,or equivalently 22.2 kg yr of 136Xe exposure.At the region around 136Xe decay Q-value of 2458 keV,the energy resolution of PandaX-Ⅱ is 4.2%.We find no evidence of NLDBD in PandaX-Ⅱand establish a lower limit for decay half-life of 2.1×1023yr at the 90% confidence level,which corresponds to an effective Majorana neutrino mass mββ <（1.4-3.7） eV.This is the first NLDBD result reported from a dual-phase xenon experiment.
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·yr,or equivalently 22.2 kg·yr of 136Xe exposure.At the region around 136Xe 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 2.1 ×10^23 yr at the 90%confidence level,which corresponds to an effective Majorana neutrino mass mββ<(1.4-3.7) eV.This is the first NLDBD result reported from a dual-phase xenon experiment.
作者
Kaixiang Ni
Yihui Lai
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
Kun Liang
Huaxuan Liu
Jianglai Liu
Wenbo Ma
Yugang Ma
Yajun Mao
Yue Meng
Parinya Namwongsa
Jinhua Ning
Xuyang Ning
Xiangxiang Ren
Changsong Shang
Lin Si
Andi Tan
Anqing Wang
Hongwei Wang
Meng Wang
Qiuhong 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
倪恺翔;赖奕辉;阿布都沙拉木·阿布都克力木;陈葳;谌勋;陈云华;崔祥仪;樊英杰;方德清;符长波;耿立升;Karl Giboni;Franco Giuliani;顾琳慧;郭绪元;韩柯;何昶达;黄迪;黄焱;黄彦霖;黄周;吉鹏;季向东;巨永林;梁昆;刘华萱;刘江来;马文博;马余刚;冒亚军;孟月;Parinya Namwongsa;宁金华;宁旭阳;任祥祥;商长松;司琳;谈安迪;王安庆;王宏伟;王萌;王秋红;王思广;王秀丽;王舟;武蒙蒙;吴世勇;夏经铠;肖梦姣;谢鹏伟;燕斌斌;杨继军;杨勇;喻纯旭;袁鞠敏;张丹;张宏光;张涛;赵力;郑其斌;周济芳;周宁;周小朋(INPAC and School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai Laboratory for Particle Physics and Cosmology,Shanghai 200240,China;Yalong River Hydropower Development Company,Ltd.,288 Shuanglin Road,Chengdu 610051,China;School of Physics,Nankai University,Tianjin 300071,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;School of Physics&International Research Center for Nuclei and Particles in the Cosmos&Beijing Key Laboratory of Advanced Nuclear Materials and Physics,Beihang University,Beijing 100191,China;School of Medical Instrument and Food Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Tsung-Dao Lee Institute,Shanghai 200240,China;School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;School of Physics,Peking University,Beijing 100871,China;Department of Physics,University of Maryland,College Park,Maryland 20742,USA;School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE),Shandong University,Jinan 250100,China;Center of High Energy Physics,Peking University,Beijing 100871,China)
基金
Supported by grants from the Ministry of Science and Technology of China(2016YFA0400301,2016YFA0400302)
a Double Top-class grant from Shanghai Jiao Tong University,grants from National Science Foundation of China(11435008,11505112,11525522,11775142,11755001)
grants from the Office of Science and Technology,Shanghai Municipal Government(11DZ2260700,16DZ2260200,18JC1410200)
the support from the Key Laboratory for Particle Physics,Astrophysics and Cosmology,Ministry of Education
supported in part by the Chinese Academy of Sciences Center for Excellence in Particle Physics(CCEPP)
Hongwen Foundation in Hong Kong
