Seasonal variation of the underground cosmic muon flux observed at Daya Bay

F. P. An,A. B. Balantekin,H. R. Band,M. Bishai, S. Blyth, D. Cao, G. F. Cao,Jun Cao,Y. L. Chan, J. F. Chang,Y. Chang,H. S. Chen,Q. Y. Chen,Shaomin Chen,Y. X. Chen,Y. Chen,J. Cheng,Z.K. Cheng,J. J. Cherwinka,M. C. Chu,A. Chukanov,J.P. Cummings, Y. Y. Ding,M. V. Diwan, M. Dolgareva,J. Dove, D. A. Dwyer,W. R. Edwards,R. Gill,M. Gonchar,G. H. Gong,H. Gong,M. Grassi,W. Q. Gu, L. Guo,Xin-Heng Guo,Y.H. Guo, Z. Guo,R. Hackenburg,S. Hans,M. He,K. M. Heeger,Y. K. Heng,A. Higuera,Y. Hsiung, B.Z. Hu, T. Hu,E. C. Huang,H. X. Huang,X. T. Huang,Patrick Huber,W. Huo,G. Hussain,D. E. Jaffe, K. L. Jen, S. Jetter,X.P. Ji,X. L. Ji, J. B. Jiao,R. A. Johnson,D. Jones,L. Kang,S. H. Kettell,A. Khan,S. Kohn,M. Kramer,K. K. Kwan, M. W. Kwok,T. Kwok,T. J. Langford,K. Lau,L. Lebanowski,Jae Hyuk Lee,J.H.C. Lee,R. T. Lei,R. Leitner,C. Li,D. J. Li,F. Li,Gang Li,Q. J. Li,Shirley Weishi Li,S.C. Li,W.D. Li,X. N. Li,X. Q. Li,Y.F. Li,Z. B. Li,H. Liang,C. J. Lin, G. L. Lin,S. Lin,S. K. Lin,Y.-C. Lin,J.J. Ling,J. M. Link,L. S. Littenberg,B. R. Littlejohn, J. L. Liu, J. C. Liu,Chang-Wei Loh,C. Lu, H. Q. Lu,Junxia Lu,K. B. Luk,X. Y. Ma,X.B. Ma,Yanhui Ma,Y. Malyshkin,D. A. Martinez Caicedo,Kirk T. McDonald,R. D. McKeown,I. Mitchell,Y. Nakajima,J. Napolitano, D. Naumov, E. Naumova, H. Y. Ngai,J. P. Ochoa-Ricoux,A. Olshevskiy,H.-R. Pan,J. Park,S. Patton, V. Pec,J. C. Peng,L. Pinsky,C. S. J. Pun,F. Z. Qi, M. Qi,X. Qian, R.M. Qiu, N. Raper,J. Ren, R. Rosero,B. Roskovec,X. Ruan,C. Sebastiani,H. Steiner,Jian Sun,W. Tang, D. Taychenachev,K. Treskov,K.V. Tsang, C. Tull,N. Viaux,B. Viren,V. Vorobel,C. H. Wang,M. Wang, N. Y. Wang,R. G. Wang,W. Wang,Xiaowei Wang,Yifang Wang,Z. Wang,H.Y. Wei,L. J. Wen, K. Whisnant,C. White,L. Whitehead, T. Wise,H. L. H. Wong, S.C.F. Wong,E. Worcester,C. H. Wu,Q. Wu,W. Wu, D. M. Xia, J. K. Xia,Z. Z. Xing,J. L. Xu, Y. Xu,Tian Xue,C. Yang,Hai-Bo Yang,L. Yang,M. Yang,M. T. Yang, Y.Z. Yang, M. Ye,Z. Ye,M. Yeh,Bing-Lin Young,Z. Yu,S. Zeng,L. Zhan,C. Zhang,C. C. Zhang, H. H. Zhang,J. W. Zhang,Qingmin Zhang,Xuming Zhang,Yanxi Zhang,Y.X. Zhang,Z. J. Zhang,Z. Y. Zhang,Z. P. Zhang, J. W. Zhao, L. Zhou,H.L. Zhuang, J. H. Zou

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS（2018）

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摘要

The Daya Bay Experiment consists of eight identically designed detectors located in three underground experimental halls named as EH1, EH2, EH3, with 250, 265 and 860 meters of water equivalent vertical overburden, respectively. Cosmic muon events have been recorded over a two-year period. The underground muon rate is observed to be positively correlated with the effective atmospheric temperature and to follow a seasonal modulation pattern. The correlation coefficient alpha, describing how a variation in the muon rate relates to a variation in the effective atmospheric temperature, is found to be alpha(EH1) = 0 : 362 +/- 0 : 031, alpha(EH2) = 0.433 +/- 0.038 and alpha(EH3) = 0.641 +/- 0.057 for each experimental hall.

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cosmic ray experiments,neutrino detectors,neutrino experiments

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