Measurement of cosmic ray flux in the China JinPing underground laboratory  

作　　者：吴昱城 郝喜庆 岳骞 李元景 程建平 康克军 陈云华 李金 李荐民 李玉兰 刘书魁 马豪 任金宝 申满斌 王继敏 吴世勇 薛涛 易难 曾雄辉 曾至 朱忠华 

机构地区：[1]Department of Engineering Physics, Tsinghua University [2]Key Laboratory of Particle and Radiation Imaging, Tsinghua University, Ministry of Education [3]Yalong River Hydropower Development Company [4]School of Physical Science and Technology, Sichuan University

出　　处：《Chinese Physics C》2013年第8期45-49,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10935005, 11055002, 11075090)

摘　　要：The China JinPing underground Laboratory （CJPL） is the deepest underground laboratory running in the world at present. In such a deep underground laboratory, the cosmic ray flux is a very important and necessary parameter for rare-event experiments. A plastic scintillator telescope system has been set up to measure the cosmic ray flux. The performance of the telescope system has been studied using the cosmic rays on the ground laboratory near the CJPL. Based on the underground experimental data taken from November 2010 to December 2011 in the CJPL, which has an effective live time of 171 days, the cosmic ray muon flux in the CJPL is measured to be （2.0±0.4）×10^-10/（cm2.s）. The ultra-low cosmic ray background guarantees an ideal environment for dark matter experiments at the CJPL.The China JinPing underground Laboratory （CJPL） is the deepest underground laboratory running in the world at present. In such a deep underground laboratory, the cosmic ray flux is a very important and necessary parameter for rare-event experiments. A plastic scintillator telescope system has been set up to measure the cosmic ray flux. The performance of the telescope system has been studied using the cosmic rays on the ground laboratory near the CJPL. Based on the underground experimental data taken from November 2010 to December 2011 in the CJPL, which has an effective live time of 171 days, the cosmic ray muon flux in the CJPL is measured to be （2.0±0.4）×10^-10/（cm2.s）. The ultra-low cosmic ray background guarantees an ideal environment for dark matter experiments at the CJPL.

关 键 词：CJPL cosmic ray flux deep underground laboratory dark matter 

分 类 号：O572.1[理学—粒子物理与原子核物理] TL942[理学—物理]