Author/Authors :
Khakian Ghomi، Mehdi نويسنده Department of Physics, Amirkabir University of technology, P.O.Box 15875-4413, Tehran, Iran , , Bahmanabadi، Mahmood نويسنده Department of Physics, Sharif Univ. of Tec h., 11555-9161, Tehran, Iran , , Hedayati Kh، Hadi نويسنده Department of Physics, Khajenasir University of technology, Tehran, Iran ,
Abstract :
We monitored several multi TeV EAS events by a 4-fold small array of water cherenkov detectors. The square configuration of the detectors is used for detection of secondary particles of EAS events. We logged 476,675 true EAS events by the array in a period of 9 months. With the calculation of the local coordinates (?, ?) of the logged events, we extracted a very good distribution of dN/d? = sin?(P0A0 cos ?+ p90A90 sin?) cosn ? for the detected events with n=6.71±0.7. The parantese in the distribution is extracted from the water cherenkov detector geometry. By investigation of HWHM of the detector signals, we obtained a 7.2? accuracy in the direction of the EAS events. Also, we showed that the logged events are quite independent and random which is a good signature from EAS nature. Finally, we obtained 50 TeV for the threshold energy of the array with the first estimation and we obtained 95 TeV for the detection of the EAS events with a more accurate way.
