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Measurement of cosmic ray flux in the China JinPing underground laboratory

2013; IOP Publishing; Volume: 37; Issue: 8 Linguagem: Inglês

10.1088/1674-1137/37/8/086001

2058-6132

Yucheng Wu, Xi-Qing Hao, Qian Yue, Yuanjing Li, Jianping Cheng, Kejun Kang, Yunhua Chen, Jin Li, Jian-Min Li, Yulan Li, Shukui Liu, Hao Ma, Jin-Bao Ren, Manbin Shen, Jimin Wang, Shiyong Wu, Tao Xue, Yi Nan, X. H. Zeng, Zhi Zeng, Zhong-Hua Zhu,

Dark Matter and Cosmic Phenomena

China JinPing underground Laboratory (CJPL) is the deepest underground laboratory presently running in the world. 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 ray on the ground laboratory near CJPL. Based on the underground experimental data taken from November 2010 to December 2011 in CJPL, which has effective live time of 171 days, the cosmic ray muon flux in CJPL is measured to be (2.0+-0.4)*10^(-10)/(cm^2)/(s). The ultra-low cosmic ray background guarantees CJPL's ideal environment for dark matter experiment.