The anisotropy of cosmic rays observed by the Tibet air shower array and muon detector array.
July 22, 2019
In the TeV energy region, the anisotropy of cosmic ray intensity was observed by some air shower experiments, like Tibet ASgamma, ARGO, HAWC, and so on. But, our previous results are contaminated with the gamma rays and electrons/positrons, and it is difficult to discriminate them with only the plastic scintillation air shower detector. Tibet ASgamma has installed underground muon detector(MD) in 2014. With MD, Tibet ASgamma became capable of discriminating two type primaries in shower events, gamma ray like (due to primary gamma rays, electrons and positron) and cosmic ray like, and to observe the anisotropies of cosmic rays and gamma rays/electrons/positrons, separately. In this work, we will report the result of the anisotropies observed by the Tibet air shower array and muon detector array.
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