摘要
China Jinping Underground Laboratory(CJPL)is ideal for studying solar,geo-,and supernova neutrinos.A precise measurement of the cosmic-ray background is essential in proceeding with R&D research for these MeV-scale neutrino experiments.Using a 1-ton prototype detector for the Jinping Neutrino Experiment(JNE),we detected 264 high-energy muon events from a 645.2-day dataset from the first phase of CJPL(CJPL-I),reconstructed their directions,and measured the cosmic-ray muon flux to be (3.53±0.22_stat.±0.07_sys.)×-10^(-10)cm^(-2).The observed angular distributions indicate the leakage of cosmic-ray muon background and agree with simulation data accounting for Jinping mountain's terrain.A survey of muon fluxes at different laboratory locations,considering both those situated under mountains and those down mine shafts,indicates that the flux at the former is generally a factor of (4±2) larger than at the latter,with the same vertical overburden.This study provides a convenient back-of-the-envelope estimation for the muon flux of an underground experiment.
作者
郭子溢
Lars Bathe-Peters
陈少敏
Mourad Chouaki
窦威
郭磊
Ghulam Hussain
李进京
刘倩
罗光
骆文泰
祁鸣
邵文辉
唐健
万林焱
王喆
续本达
徐彤
徐蔚然
杨玉梓
Minfang Yeh
赵林
Zi-yi Guo;Lars Bathe-Peters;Shao-min Chen;Mourad Chouaki;Wei Dou;Lei Guo;Ghulam Hussain;Jin-jing Li;Qian Liu;Guang Luo;Wen-tai Luo;Ming Qi;Wen-hui Shao;Jian Tang;Lin-yan Wan;Zhe Wang;Ben-da Xu;Tong Xu;Wei-ran Xu;Yu-zi Yang;Minfang Yeh;Lin Zhao(Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Center for High Energy Physics,Tsinghua University,Beijing 100084,China;Key Laboratory of Particle&Radiation Imaging(Tsinghua University),Ministry of Education,China;Institut für Physik,Technische Universität Berlin,Berlin 10623,Germany;École Polytechnique Fédérale de Lausanne,Lausanne 1015,Switzerland;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;School of Physics,Sun Yat-Sen University,Guangzhou 510275,China;School of Physics,Nanjing University,Nanjing 210093,China;Brookhaven National Laboratory,Upton,New York 11973,USA)
基金
Supported in part by the National Natural Science Foundation of China(11620101004,11475093)
the Key Laboratory of Particle&Radiation Imaging(Tsinghua University,the CAS Center for Excellence in Particle Physics(CCEPP),and Guangdong Basic and Applied Basic Research Foundation(2019A1515012216)
Portion of this work performed at Brookhaven National Laboratory is supponted in part by the United States Department of Energy(DE-SC0012704)。
