• A. A. AL-RUBAIEE

      Articles written in Journal of Astrophysics and Astronomy

    • Extension of Cherenkov Light LDF Parametrization for Tunka and Yakutsk EAS Arrays

      A. A. Al-Rubaiee

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      The Cherenkov light Lateral Distribution Function (LDF) from particles initiated Extensive Air Showers (EAS) with ultrahigh energies (𝐸 > 1016 eV) was simulated using CORSIKA program for configuration of Tunka and Yakutsk EAS arrays for different primary particles (p, Fe and O2) and different zenith angles. By depending on the Breit–Wigner function, a parametrization of the Cherenkov light LDF was reconstructed on the basis of this simulation as a function of the primary energy. The comparison of the approximated Cherenkov light LDF with that measured on Tunka and Yakutsk EAS arrays gives the possibility of identification of energy spectrum and mass composition of particles initiating EAS about the knee region of the cosmic ray spectrum. The extrapolation of approximated Cherenkov light LDF for energies 20, 30 and 50 PeV was obtained for different primary particles and different zenith angles.

    • Modulating the lateral profile in extensive air showers for Yakutsk EAS array

      A. A. AL-RUBAIEE HASSANEN ABDULHUSSAEN JASSIM IMAN TARIK AL-ALAWY

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      In this work, the effects of extensive air showers (EASs) were described by estimating the lateral distribution function (LDF) at very high energies of various cosmic-ray particles. The LDF simulation was performed using the air shower extended simulation (AIRES) system version 2.8.4a. LDF was simulated forcharged particles such as pair production, muons, and all charged particles at very high energies (10$^{16}$, 10$^{18}$, and 10$^{19}$ eV). The effect of primary particles, energies, and zenith angle ($\theta$) on the LDF of the charged particles produced in the EAS was taken into account. The LDF simulation of the charged particles was compared with the experimental results and found to be in good agreement with the pair production and muon particles in energies of 10$^{18}$ and 10$^{19}$ eV for $\theta = 10^{\circ}$. LDF parameterization of charged secondary particles (electrons and positrons) and secondary muon particles, initiated by primary proton and iron nucleiat the energy 10$^{19}$ eV, was performed. On the basis of this simulation, sets of approximating functions for primary protons and iron nuclei for vertical showers were obtained.

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