Search for Correlated High Energy Cosmic Ray Events with CHICOS

Details Search for Correlated High Energy Cosmic Ray Events with CHICOS Search for Correlated High Energy Cosmic Ray Events with CHICOS

2004-11-08

arxiv.org/abs/astro-ph/0411212v2

J.Phys. G31 (2005) 409-416

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures

Scientific paper

10.1088/0954-3899/31/5/011

We present the results of a search for time correlations in high energy cosmic ray data (primary E > 10^{14} eV) collected by the California HIgh school Cosmic ray ObServatory (CHICOS) array. Data from 60 detector sites spread over an area of 400 km^2 were studied for evidence of correlated events separated by more than 1 km with coincidence times ranging from 1 microsec up to 1 second. All searches were consistent with the absence of excess coincidences except for a 2.9 sigma excess observed for coincidence times less than 10 microsec. We report upper limits for the coincidence probability as a function of coincidence time.

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