The energy spectrum of all-particle cosmic rays around the knee region observed with the Tibet-III air-shower array

Details The energy spectrum of all-particle cosmic rays around the knee region observed with the Tibet-III air-shower array The energy spectrum of all-particle cosmic rays around the knee region observed with the Tibet-III air-shower array

2008-03-06

arxiv.org/abs/0803.1005v1

Adv.Space Res.42:467-472,2008

Astronomy and Astrophysics

Astrophysics

12 pages, 7 figures, accepted by Advances in space research

Scientific paper

10.1016/j.asr.2007.04.080

We have already reported the first result on the all-particle spectrum around the knee region based on data from 2000 November to 2001 October observed by the Tibet-III air-shower array. In this paper, we present an updated result using data set collected in the period from 2000 November through 2004 October in a wide range over 3 decades between $10^{14}$ eV and $10^{17}$ eV, in which the position of the knee is clearly seen at around 4 PeV. The spectral index is -2.68 $\pm$ 0.02(stat.) below 1PeV, while it is -3.12 $\pm$ 0.01(stat.) above 4 PeV in the case of QGSJET+HD model, and various systematic errors are under study now.

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