Primary proton and helium spectra at energy range from 50 TeV to 10<sup>15</sup> eV observed with (YAC-I + Tibet-III) hybrid experiment


Abstract:

A new EAS hybrid experiment has been designed by constructing a YAC (Yangbajing Air shower Core detector array) inside the existing Tibet-III air shower array. The first step of YAC called”YAC-I” has been successfully carried out in 2009-2010 together with Tibet-III air-shower array. YAC-II has also been operated from 2011. In this proceeding, the primary proton and helium spectra at energy range from 50 TeV to 1015 eV derived from YAC-I data based on the newest interaction model EPOS-LHC (v.3400), QGSJETII-04 and SIBYLL2.1 are reported. The obtained (P+He) spectra is smoothly connected with direct observation data below 100 TeV and also with our previously reported results at higher energies within statistical errors. The knee of the (P+He) spectra is located around 400 TeV. The interaction model dependence in deriving the primary (P+He) spectra are found to be small (less than 25% in absolute intensity, 10% in position of the knee), and the composition model dependence is less than 10% in absolute intensity.

Año de publicación:

2013

Keywords:

  • Helium
  • Knee energy region
  • cosmic rays
  • neural network
  • Proton

Fuente:

scopusscopus