Primary cosmic-ray spectra and composition in theenergy range from 50 TeV to$10^{16}$eV observed withthe new Tibet hybrid experiment

Abstract

We have upgraded the new Tibet ASgamma experiment in China since 2014 to measure the chemical composition of cosmic rays around the knee. This hybrid experiment consists of an air-shower- core detector array (YAC) to detect high energy electromagnetic component and an air-shower array (Tibet-III). We have carried out a detailed air-shower Monte Carlo (MC) simulation to study the performance of the hybrid detectors by using CORSIKA (version7.5000), which includes EPOS-LHC, QGSJETII-04, SIBYLL2.1 and SIBYLL2.3 hadronic interaction models. The preliminary results of the interaction model checking above 50 TeV energy region are reported in this paper, and the primary proton and helium spectra at energy range from 50 TeV to 10^16 eV was derived from YAC data and it is smoothly connected to direct observation data at lower energies and also to previously reported our works at higher energies within statistical errors.