AN INVESTIGATION OF MASS COMPOSITION OF ULTRA-HIGH ENERGY COSMIC RAYS WITH ENERGIES ABOVE 1019 eV VIA THE STUDY OF EXTENSIVE AIR SHOWERS

Serbian Astronomical Journal

article

S. Doostmohammadi¹  S. J. Fatemi¹ 

[1] Faculty of Physics, Shahid Bahonar University of Kerman

关键词: cosmic rays;   

DOI  :  10.2298/SAJ1284087D

来源: Astronomical Observatory, Department of Astronomy, Belgrade

【 摘 要 】

The electron and muon components of extensive air shower (EAS) with energies above 1019 eV are analyzed via various giant EAS arrays. A varying property of showers is observed for two energy ranges; higher and lower than (3 − 4) × 1019 eV. The age parameter, zenith angle, shower size dependence on muon size and shower size dependence on primary energy show an increment of mass composition (MC) above (3−4)×1019eV. Comparison of the observed EAS results with the simulations of Capdevielle et al. (2000) and Shinozaki et al. (2005) gives at most 20% photon fraction for primary energies above 1019 eV. The arrival directions of showers above 4×1019 eV indicate an increasing concentration towards the super galactic plane.

【 授权许可】

CC BY-NC-ND