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Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - CRI - Cosmic Ray Indirect
Study of the sharp "knee" phenomenon of cosmic ray spectrum by using newly upgraded Tibet ASγ experiment
Y. Zhang,* J. Huang, D. Chen, L.M. Zhai, X. Chen, Y.H. Lin, J.H. Fang, Y. Nakamura
*corresponding author
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Pre-published on: 2019 July 22
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Cosmic Ray (CR) spectrum in a certain energy region can not be expressed by a simple power-law as it has a structure. The all-particle energy spectrum of primary CRs observed in a wide range from 10^14 eV to 10^17 eV with the Tibet-III AS array clearly shows a ‘sharp knee’ at around 4 PeV. Based on the hardening structure of energy spectrum observed by AMS-02, CREAM and the (proton+helium) spectrum at 50 – 1000 TeV energy region observed by (YAC-I+Tibet-III), we will discuss the origin of ‘shap knee’ whether it is caused by nearby source or nonlinear acceleration.
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