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
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
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(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)。
