Recent Data of Extensive Air Showers Recorded by Alborz I Array and Their Detailed Analysis

Document Type : Research Paper


1 Physics Department, Sharif University of Technology, Tehran, Iran

2 Alborz Observatory‎, ‎Sharif University of Technology‎, ‎PO Box 11155-9161‎, ‎Tehran‎, ‎Iran


An array of five scintillation detectors has been installed in Sharif University of Technology to record extensive air showers. ‎‎‎By using the time lags of the secondary particles of air showers relative to each other and the location of each of these ‎particles‎ relative to the core of the shower, the arrival direction of the primary particle producing each air shower has been ‎obtained.‎

‎‎These data show that the distribution of time intervals of successive events in all directions of arrival into‎ the atmosphere is a random distribution‎. The distribution of the time intervals between successive events in different ‎seasons‎ has also been obtained and the seasonal effect has been ‎investigated‎. The effects of the environment‎, ‎including temperature and pressure‎, on the cosmic ray count rate have been investigated‎. ‎The distribution of zenith and azimuth angles‎, ‎as well as‎ the ‎solar,‎ sidereal, and antisidereal time distributions of cosmic rays‎, ‎have been obtained‎.


[1] Pezeshkian, Y., & et al. 2015, Nucl. Instrum. Methods A, 733, 117.
[2] Mortazavi Moghaddam, S., & Bahmanabadi, M. 2018, PHYSICAL REVIEW D, 97, 062001.
[3] Halataei, S. M. H. M., & et al. 2008, Phys. Rev. D 77, 083001.
[4] Ahlen, S. P., & et al. 1992, Nuclear Physics B, 370, 432.
[5] Bhat, C. L., & et al. 1980, Nature, 288, 146.
[6] Badino, G., & et al. 1980, Lett. Nuovo Cimento, 28, 93.
[7] Katayose, Y., & et al. 1998, IL. Nuovo Cimento, 21, 3.
[8] Smith, G. R., & et al. 1983, Phys. Rev. D, 28, 1601.
[9] Fegan, D. J., & et al. 1981, Proc. XVII ICRC (Paris), 16, 296.