First results on ^(76)Ge neutrinoless double beta decay from CDEX-1 experiment

查看全文 作　　者：Li [1]Wang;Qian [1]Yue;KeJun [1]Kang;JianPing [1]Cheng;YuanJing [1]Li;TszKing Henry [2]Wong;ShinTed [3,2]Lin;JianPing [4]Chang;JingHan [2]Chen;QingHao [1]Chen;YunHua [5]Chen;Zhi [1]Deng;Qiang [3]Du;Hui [1]Gong;Li [4]He;QingJu [1]He;JinWei [1]Hu;HanXiong [6]Huang;TengRui [2]Huang;LiPing [1]Jia;Hao [1]Jiang;HauBin [2]Li;Hong [4]Li;JianMin [1]Li;Jin [1]Li;Jun [4]Li;Xia [6]Li;XueQian [7]Li;YuLan [1]Li;FongKay [2]Lin;ShuKui [3]Liu;Hao [1]Ma;JingLu [1]Ma;XingYu [1]Pan;Jie [6]Ren;XiChao [6]Ruan;ManBin [5]Shen;Vivek [2,8]Sharma;Lakhwinder [2,8]Singh;Manoj Kumar [2,8]Singh;Manoj Kumar [2,8]Singh;Arun Kumar [2,8]Soma;ChangJian [3]Tang;WeiYou [1]Tang;ChaoHsiung [2]Tseng;JiMin [5]Wang;Qing [1]Wang;ShiYong [5]Wu;YuCheng [1]Wu;HaoYang [3]Xing;Yin [7]Xu;Tao [1]Xue;LiTao [1]Yang;SongWei [2]Yang;Nan [1]Yi;ChunXu [7]Yu;HaiJun [4]Yu;WeiHe [1]Zeng;XiongHui [5]Zeng;Zhi [1]Zeng;Lan [4]Zhang;YunHua [5]Zhang;MingGang [7]Zhao;Wei [1]Zhao;JiFang [5]Zhou;ZuYing [6]Zhou;JingJun [3]Zhu;WeiBin [4]Zhu;ZhongHua [5]Zhu

机构地区：[1]Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics,Tsinghua University;[2]Institute of Physics, Academia Sinica;[3]School of Physical Science and Technology, Sichuan University;[4]NUCTECH Company;[5]YaLong River Hydropower Development Company;[6]Department of Nuclear Physics, China Institute of Atomic Energy;[7]School of Physics, Nankai University;[8]Department of Physics, Banaras Hindu University;

出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2017年第60卷第7期,共7页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11275107,11475117,11475099,and 11675088);the National Key Basic Research Program of China(Grant No.2010CB833006) 摘　　要：We report the first results on ^(76)Ge neutrinoless double beta decay from stage one of the China dark-matter experiment(CDEX).A p-type point-contact high-purity germanium detector with a mass of 994 g has been installed to detect neutrinoless double beta decay events, as well as to directly detect dark matter particles. An exposure of 304 kg d has been analyzed over a wide spectral band from 500 keV to 3 MeV. The average event rate obtained was about 0.012 counts per keV per kg per day over the 2.039 MeV energy range. The half-life of ^(76)Ge neutrinoless double beta decay derived based on this result is T^(0ν)1/2>6.4×10^(22) yr(90% C.L.). An upper limit on the effective Majorana-neutrino mass of 5.0 eV has been achieved. 关键词：neutrinoless double beta decay CDEX point-contact germanium detector 76Ge isotope

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First results on ^(76)Ge neutrinoless double beta decay from CDEX-1 experiment

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