The all-particle spectrum of primary cosmic rays in the wide energy range from 1014 to 1017 eV observed with the Tibet-III air-shower array

Abstract:

We present an updated all-particle energy spectrum of primary cosmic rays in a wide range from 10 14 to 10 17 eV using 5.5\times 10^{7} events collected from 2000 November through 2004 October by the Tibet-III air-shower array located 4300 m above sea level (an atmospheric depth of 606 g cm–2). The size spectrum exhibits a sharp knee at a corresponding primary energy around 4 PeV. This work uses increased statistics and new simulation calculations for the analysis. We discuss our extensive Monte Carlo calculations and the model dependencies involved in the final result, assuming interaction models QGSJET01c and SIBYLL2. 1, and heavy dominant (HD) and proton dominant (PD) primary composition models. Pure proton and pure iron primary models are also examined as extreme cases. A detector simulation was also performed to improve our accuracy in determining the size of the air showers and …

Año de publicación:

2008

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