Study on Mass Composition of Extensive Air Shower with Ultra High Energy Cosmic Rays Using Q Parameter and Their Muon Component (original) (raw)
2017
Mass Composition (MC) of Cosmic Rays at high energies is one of the most important issues which are significantly related to astrophysical sources. At present work, we have tried to study the spatial parameters, such as age parameter, slope of lateral distribution function of electrons, and muon density of air shower. Each parameter will be discussed separately and also their effect on MC of cosmic rays with energy above 10 18 eV will be considered. The Yakutsk Extensive Air Shower array data was used in our work. Moreover, the present results can be used to distinguish the popular top-down and bottom-up models of astrophysical sources of high energy cosmic rays.
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Serbian Astronomical Journal, 2012
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) x 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)x 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 4x1019 eV indicate an increasing concentration towards the super galactic plane.
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