Measurement of muon-induced neutron yield at the China Jinping Underground Laboratory  

作　　者：Lin Zhao Wentai Luo Lars Bathe-Peters Shaomin Chen Mourad Chouaki Wei Dou Lei Guo Ziyi Guo Ghulam Hussain Jinjing Li Ye Liang Qian Liu Guang Luo Ming Qi Wenhui Shao Jian Tang Linyan Wan Zhe Wang Yiyang Wu Benda Xu Tong Xu Weiran Xu Yuzi Yang Minfang Yeh Aiqiang Zhang Bin Zhang JNE collaboration 赵林;骆文泰;Lars Bathe-Peters;陈少敏;Mourad Chouaki;窦威;郭磊;郭子溢;Ghulam Hussain;李进京;梁晔;刘倩;罗光;祁鸣;邵文辉;唐健;万林焱;王喆;武益阳;续本达;徐彤;徐蔚然;杨玉梓;Minfang Yeh;张爱强;张彬;JNE collaboration(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;不详)

机构地区：[1]Department of Engineering Physics,Tsinghua University,Beijing 100084,China [2]Center for High Energy Physics,Tsinghua University,Beijing 100084,China [3]Key Laboratory of Particle&Radiation Imaging(Tsinghua University),Ministry of Education,China [4]Institut für Physik,Technische Universität Berlin,Berlin 10623,Germany [5]École Polytechnique Fédérale de Lausanne,Lausanne 1015,Switzerland [6]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [7]School of Physics,Sun Yat-Sen University,Guangzhou 510275,China [8]School of Physics,Nanjing University,Nanjing 210093,China [9]Brookhaven National Laboratory,Upton,New York 11973,USA [10]不详

出　　处：《Chinese Physics C》2022年第8期211-219,共9页中国物理C（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China (11620101004,11475093,12127808);the Key Laboratory of Particle&Radiation Imaging(Tsinghua University);the CAS Center for Excellence in Particle Physics (CCEPP);Guangdong Basic and Applied Basic Research Foundation(2019A1515012216);Portion of this work performed at Brookhaven National Laboratory is supported in part by the United States Department of Energy (DESC0012704)。

摘　　要：Solar,terrestrial,and supernova neutrino experiments are subject to muon-induced radioactive background.The China Jinping Underground Laboratory(CJPL),with its unique advantage of a 2400 m rock coverage and long distance from nuclear power plants,is ideal for MeV-scale neutrino experiments.Using a 1-ton prototype detector of the Jinping Neutrino Experiment(JNE),we detected 3 43 high-energy cosmic-ray muons and(7.86±3.97)muon-induced neutrons from an 820.28-day dataset at the first phase of CJPL(CJPL-I).Based on the muon-induced neutrons,we measured the corresponding muon-induced neutron yield in a liquid scintillator to be(3.44±1.86_(stat.)±0.76_(syst.))×10^(-4) μ^(-1)g^(-1)cm^(2) at an average muon energy of 340 GeV.We provided the first study for such neutron background at CJPL.A global fit including this measurement shows a power-law coefficient of(0.75±0.02) for the dependence of the neutron yield at the liquid scintillator on muon energy.

关 键 词：Underground laboratory neutrino detector cosmic-ray muon neutron yield liquid scintillator 

分 类 号：O572.321[理学—粒子物理与原子核物理]