Authors

Abstract

Optimum distance is defined as  a distance from the air -shower core in which  the density of a number of particles calculated by the lateral distribution function at that distance  has the least uncertainty. Furthermore, with a good approximation, this distance is independent  of  the characteristics of primitive ray  and it only depends on the geometric shape of array . In this paper, by simulating 1000 vertical EAS of protons with the energy 300 TeV , using the CORSIKA Monte Carlo code and trigger condition, the calculated distance for the array triggering ALBORZ-1 was found to be equal to 9±1 m. Also, it was found that this distance as well as the density of the number of calculated particles was independent of the lateral distribution function used in the calculations
 
 

Keywords

[1] G. Rastegarzadeh and L. Rafezi, Energy, altitude, and mass dependence of steepness of the lateral distribution function of electrons and muons in extensive air showers, Nuclear Inst. and Methods in Physics Research, A, 763 (2014) 197-201.
[2] G. Rastegarzadeh, Cosmic ray simulation and dependence of maximum air shower development (Hmax) on mass and energy of primaries, IJPR , 6 (2006), No.2, 88-94.
[3] A.M.Hillas et al, Measurement of primary energy of air showers in the presence of fluctuations, Proc. 12th ICRC, Hobart, Australia, 3(1971) 1001.
[4] D. Newton, J. Knapp, A.A. Watson, The optimum distance at which to determine the size of a giant air shower, Astropart.Phys.26 (2007) 414.
[5] S.Abdollahi et al, Alborz-I array: A simulation on performance and properties of the array around the knee of the cosmic ray spectrum, Astropart.Phys.76 (2016) 1–8.
[6] D. M. Edge et al, The cosmic ray spectrum at energies above 1017 eV, J. Phys. A: Math. Nucl. Gen. 6 ( 1973) 1612.
[7] A.Tapia et al, The lateral shower age parameter as an estimator of chemical composition, Proc. 33th ICRC, Rio de Janeiro, Brazil, (2013).
[8] P.K.F.Grieder, Extensive Air Showers, Springer, vol1, (2010).

ارتقاء امنیت وب با وف ایرانی