The first look of coincident events from air showers of high-energy cosmic rays in Uijeongbu area

Abstract

COREA(COsmic ray Research and Education Array) collaboration have developed an array of plastic scintillation detectors to measure air showers of high-energy cosmic rays. The time difference between coincidence signals from an air shower in three detector stations running independently has been improved up to 20 ns which corresponds to only two pulses of the oscillators in the data acquisition electronics of the stations. We present the improved performance on timing resolution of the detector and the first analysis result of air shower events taken in Uijeongbu area.