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Improved measurement of electron antineutrino disappearance at Daya Bay

Chinese Physics C 2013年第1期37卷 1-20页

作者：安丰鹏安琪白景芝 A.B.Balantekin H.R.Band W.Beriguete M.Bishai S.Blyth R.L.Brown 曹国富曹俊 R.Carr W.t.Chan 常劲帆 Y.Chang C.Chasman 陈和生 H.Y.Chen 陈申见陈少敏陈潇聪陈晓辉陈晓苏陈羽陈义学 J.J.Cherwinka 朱明中 J.P.Cummings 邓子艳丁雅韵 M.V.Diwan E.Draeger 杜小峰 D.Dwyer W.R.Edwards S.R.Ely 方绍东付金煜付在伟葛良全 R.L.Gi11 M.Gonchar 龚光华宫辉 Y.A.Gornushkin 顾文强关梦云郭新恒 R.W.Hackenburg R.L.Hahn S.Hans 郝慧峰何苗贺青 K.M.Heeger 衡月昆 P.Hinrichs Y.K.Hor Y.B.Hsiung B.z.Hu 胡涛黄翰雄 H.z.Huang 黄性涛 P.Huber V.Issakov z.Isvan D.E.Jaffe S.Jetter 季筱璐季向盼姜海静焦健斌 R.A.Johnson 康丽 S.H.Kettell M.Kramer 关健强郭文伟郭人能 C.Y.Lai 赖万昌 W.H.Lai K.Lau L.Lebanowski J.Lee 雷瑞霆 R.Leitner 梁干庄梁嘉怡 C.A.Lewis 李飞李高嵩李秋菊李卫东李小波李小男李学潜李仪李志斌梁昊林政儒 C.L.Lin S.K.Lin 林延畅凌家杰 J.M.Link L.Littenberg B.R.Littlejohn D.W.Liu 刘金昌刘江来刘颖彪陆昌国路浩奇陆永康 K.B.Luk 马秋梅马续波马骁妍马宇蒨 K.t.McDonald M.C.McFarlane R.D.McKeown Y.Meng D.Mohapatra Y.Nakajima J.Napolitano D.Naumov I.Nemchenok 倪浩然 W.K.Ngai 聂阳波宁哲 J.P.Ochoa-Ricoux A.Olshevski S.Patton V.Pec J.C.Peng L.E.Piilonen L.Pinsky 潘振声齐法制祁鸣钱鑫 N.Raper 任杰 R.Rosero B.Roskovec 阮锡超邵贝贝师恺 H.Steiner 孙功星孙吉良 N.tagg 谭耀豪 H.K.tanaka 唐晓 H.themann Y.torun S.trentalange O.tsai K.V.tsang R.H.M.tsang C.E.tull Y.C.tung B.Viren V.Vorobe1 C.H.Wang 王灵淑王玲玉王龙泽王萌王乃彦王瑞光 W.Wang 王玺王贻芳王喆王铮王志民 D.M.Webber 魏瀚宇魏亚东温良剑 K.Whisnant C.G.White L.Whitehead Y.Williamson t.Wise H.L.H.Wong E.t.Worcester F.F.Wu 吴群习建博夏冬梅邢志忠徐建一徐晶徐吉磊徐晔薛涛杨长根杨雷叶梅 M.Yeh Y.S.Yeh B.L.Young 于泽源占亮 C.Zhang 章飞虹张家文张清民张书华张一纯张银鸿张一心张志坚张子平张智勇赵洁赵庆旺赵豫斌郑磊钟玮丽周莉周祖英庄红林邹佳恒 Institute of High Energy Physics Chinese Academy of Sciences University of Science and technology of China University of Wisconsin Brookhaven National Laboratory National United University California Institute of technology Nanjing University Department of Engineering Physics Tsinghua University Chinese University of Hong Kong Shenzhen Univeristy North China Electric Power University Siena College Department of Physics Illinois Institute of Technology Lawrence Berkeley National Laboratory Department of Physics University of California Department of Physics University of Illinois at Urbana-Champaign Chengdu University of technology Joint Institute for Nuclear Research Shanghai Jiao tong University Beijing Normal University Joseph henry Laboratories Princeton University Center for Neutrino Physics Virginia Tech Department of Physics National Taiwan University Institute of Physics National Chiao-Tung University China Institute of Atomic Energy University of California Shandong University School of Physics Nankai University University of Cincinnati Dongguan University of technology Department of Physics The University of Hong Kong Department of Physics University of Houston Charles University Faculty of Mathematics and Physics Sun Yat-Sen(Zhongshan)University College of William and Mary Rensselaer Polytechnic Institute China Guangdong Nuclear Power Group Iowa State University Xi'an Jiaotong University

We report an improved measurement of the neutrino mixing angle θ13 from the Daya Bay Reactor Neutrino Experiment. We exclude a zero value for sin22θ13 with a significance of 7.7 standard deviations. Electron antineutrinos from six reactors of 2.9 GWm th were detected in six antineutrino detectors deployed in two near （flux-weighted baselines of 470 m and 576 m） and one far （1648 m） underground experimental halls. Using 139 days of data, 28909 （205308） electron antineutrino candidates were detected at the far hall （near halls）. the ratio of the observed to the expected number of antineutrinos assuming no oscillations at the far hall is 0.944± 0.007（stat.） ± 0.003（syst.）. An analysis of the relative rates in six detectors finds sin22θ13=0.089± 0.010（stat.）±0.005（syst.） in a three-neutrino framework.

关键词： neutrino oscillation neutrino mixing reactor Daya Bay

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Searching for ^(76)Ge neutrinoless double beta decay with the CDEX-1B experiment

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Chinese Physics C 2024年第10期48卷 11-22页

作者： Bing-tao Zhang Jun-Zheng Wang Li-tao Yang Qian Yue Ke-Jun Kang Yuan-Jing Li Hai-Peng An C.Greeshma Jian-Ping Chang Yun-Huan Chen Jian-Ping Cheng Wen-Han Dai Zhi Deng Chang-Hao Fang Xin-Ping Geng Hui Gong Qiu-Ju Guo Xu-Yuan Guo Li He Sheng-Ming He Jin-Wei Hu Han-Xiong Huang tu-Chen Huang Hai-tao Jia Xi Jiang S.Karmakar Hao-Bin Li Jian-Min Li Jin Li Qian-Yun Li Ren-Ming-Jie Li Xue-Qian Li Yu-Lan Li Yi-Fan Liang Bin Liao Fong-Kay Lin Shin-ted Lin Jia-Xuan Liu Shu-Kui Liu Yan-Dong Liu Yu Liu Yuan-Yuan Liu Zhong-Zhi Liu Hao Ma Yu-Cai Mao Qi-Yuan Nie Jin-Hua Ning Hui Pan Ning-Chun Qi Jie Ren Xi-Chao Ruan Ze She Manoj Kumar Singh tian-Xi Sun Chang-Jian tang Wei-You tang Yang tian Guang-Fu Wang Li Wang Qing Wang Yu-Feng Wang Yun-Xiang Wang henry-tsz-King Wong Shi-Yong Wu Yu-Cheng Wu Hao-Yang Xing Rui Xu Yin Xu tao Xue Yu-Lu Yan Nan Yi Chun-Xu Yu Hai-Jun Yu Jian-Feng Yue Ming Zeng Zhi Zeng Feng-Shou Zhang Lei Zhang Zhen-Hua Zhang Zhen-Yu Zhang Kang-Kang Zhao Ming-Gang Zhao Ji-Fang Zhou Zu-Ying Zhou Jing-Jun Zhou Key Laboratory of Particle and Radiation Imaging(Ministry of Education)and Department of Engineering Physics Tsinghua UniversityBeijing 100084 Department of Physics Tsinghua UniversityBeijing 100084 Institute of Physics Academia SinicaTaipei 11529 NUCtECH Company Beijing 100084 YaLong River Hydropower Development Company Chengdu 610051 College of Nuclear Science and technology Beijing Normal UniversityBeijing 100875 College of Physics Sichuan UniversityChengdu 610065 School of Physics Peking UniversityBeijing 100871 Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413 Sino-French Institute of Nuclear and technology Sun Yat-sen UniversityZhuhai 519082 School of Physics Nankai UniversityTianjin 300071 Department of Physics Banaras Hindu UniversityVaranasi 221005 Department of Physics Beijing Normal UniversityBeijing 100875

We operated a p-type point contact high purity germanium(PPCGe)detector(CDEX-1B,1.008 kg)in the China Jinping Underground Laboratory(CJPL)for 500.3 days to search for neutrinoless double beta(0νββ)decay of ^(76)Ge.A total of 504.3 kg⋅day effective exposure data was *** anti-coincidence and the multi/single-site event(MSE/SSE)discrimination methods were used to suppress the background in the energy region of interest(ROI,1989–2089 keV for this work)with a factor of 23.A background level of 0.33 counts/(keV⋅kg⋅yr)was *** lower limit on the half life of^(76)Ge 0νββdecay was constrained as t_(1/2)^(0ν)>1.0×10^(23)yr(90%C.L.),corresponding to the upper limits on the effective Majorana neutrino mass:<3.2–7.5 eV.

关键词： neutrinoless double beta decay CDEX point-contact germanium detector ^(76)Ge

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Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

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Chinese Physics C 2017年第1期41卷 11-46页

作者：安丰鹏 A.B.Balantekin H.R.Band M.Bishai S.Blyth 曹德文曹国富曹俊岑吴镕陳日朗常劲帆張立楚张昀陈和生陈泉佑陈少敏陈义学陈羽程佳樺程捷程雅苹成兆侃 J.J.Cherwinka 朱明中 A.Chukanov J.P.Cummings J.de Arcos 邓子艳丁雪峰丁雅韵 M.V.Diwan M.Dolgareva J.Dove D.A.Dwyer W.R.Edwards R.Gill M.Gonchar 龚光华宫辉 M.Grassi 顾文强关梦云郭磊郭如盼郭新恒郭子溢 R.W.Hackenburg 韩然 S.Hans 何苗 K.M.Heeger 衡月昆 A.Higuera Y.K.Hor 熊怡胡貝禎胡涛胡维黄恩泉黄翰雄黄性涛 P.Huber 霍文驹 G.Hussain D.E.Jaffe P.Jaffke 任國綸 S.Jetter 季向盼季筱璐焦健斌 R.A.Johnson D.Jones J.Joshi 康丽 S.H.Kettell S.Kohn M.Kramer 關健强郭文伟郭天能 t.J.Langford K.Lau L.Lebanowski J.Lee 李曉菁雷瑞庭 R.Leitner 李超李登杰李飞李高嵩李秋菊黎山峰 S.C.Li 李卫东李小男李玉峰李志兵梁昊林政儒林贵林林盛鑫林士凱林禹丞凌家杰 J.M.Link L.Littenberg B.R.Littlejohn 刘大为刘江来刘金昌 C.W.Loh 陆昌国路浩奇陆稼书陆锦标吕志鹏马秋梅马晓妍马续波马宇倩 Y.Malyshkin D.A.Martinez Caicedo K.t.McDonald R.D.McKeown I.Mitchell M.Mooney Y.Nakajima J.Napolitano D.Naumov E.Naumova 倪浩然宁哲 J.P.Ochoa-Ricoux A.Olshevskiy 潘孝儒 J.Park S.Patton V.Pec 彭仁杰 L.Pinsky 潘振声齐法制祁鸣钱鑫 N.Raper 任杰 R.Rosero B.Roskovec 阮锡超 H.Steiner 孙功星孙吉良唐炜 D.taychenachev K.tVeskov K.V.tsang C.E.tull N.Viaux B.Viren V.Vorobei 王正祥王萌王乃彦王瑞光王为王玺王贻芳王喆王铮王志民魏瀚宇温良剑 K.Whisnant C.G.White L.Whitehead t.Wise 黄显诺黄振辉 E.Worcester 吳珈豪吴群吴文杰夏冬梅夏经凯邢志忠徐建一徐吉磊徐晔薛涛杨长根杨海波杨雷阳马生杨梦婷叶梅 Z.Ye 叶铭芳杨炳麟于泽源曾珊占亮张超张宏浩张家文张清民张玄同张一鸣张一心张玉美张志坚张智勇张子平赵洁赵庆旺赵豫斌钟玮丽周莉 N.Zhou 庄红林邹佳恒 Institute of Modern Physics East China University of Science and Technology University of Wisconsin Department of Physics Yale University Brookhaven National Laboratory Department of Physics National Taiwan University National United University Nanjing University Institute of High Energy Physics Chinese University of Hong Kong Institute of Physics National Chiao-Tung University Shandong University Department of Engineering Physics Tsinghua University North China Electric Power University Shenzhen University Sun Yat-Sen (Zhongshan) University Joint Institute for Nuclear Research Siena College Department of Physics Illinois Institute of Technology Department of Physics University of Illinois at Urbana-Champaign Lawrence Berkeley National Laboratory Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai Laboratory for Particle Physics and Cosmology Beijing Normal University Department of Chemistry and Chemical technology Bronx Community College Department of Physics University of Houston Center for Neutrino Physics Virginia Tech China Institute of Atomic Energy University of Science and technology of China School of Physics Nankai University Department of Physics University of Cincinnati Department of Physics College of Science and Technology Temple University Dongguan University of technology Department of Physics University of California Department of Physics The University of Hong Kong Charles University Faculty of Mathematics and Physics Joseph henry Laboratories Princeton University Department of Nuclear Science and technology School of Energy and Power Engineering Xi’an Jiaotong University Instituto de F'?sica Pontificia Universidad Católica de Chile California Institute of technology College of William and Mary Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute China General Nuclear Power Group College of Electronic Science and Engineering National University of Defense Technology Iowa State University Chongqing University

A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. the antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near（560 m and 600 m flux-weighted baselines） and one far（1640 m flux-weighted baseline） underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay（IBD） candidates were detected. the IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020（0.992±0.021） for the Huber＋Mueller（ILL＋Vogel） model. A 2.9σ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4–6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.

关键词： antineutrino flux energy spectrum reactor Daya Bay

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关于Bose-Chaudhuri码中的信息数字个数

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吉林大学自然科学学报 1963年第3期 189-200页

作者：苏运霖

Peterson 的文章中谈到了对于某些较长的 Bose-Chaudhuri 码(以下简称为B-C 码),码参数的计算问题。他还针对二进制的情形,对码的长度 n 充分大的 B-C 码证明了“信息比例”趋于零。要确定比例,关键在于算出码的信息数字个数。但是,Pete... 详细信息

Peterson 的文章中谈到了对于某些较长的 Bose-Chaudhuri 码(以下简称为B-C 码),码参数的计算问题。他还针对二进制的情形,对码的长度 n 充分大的 B-C 码证明了“信息比例”趋于零。要确定比例,关键在于算出码的信息数字个数。但是,Peterson 只是给出了对于信息数字个数的估计,没有精确地计算出对于长度为 n 的 t-误差校正码中之信息数字个数。*** 针对这一问题,作了进一步的研究,

关键词：序列个数 Bose-Chaudhuri

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