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IOP Publishing, Journal of Physics G: Nuclear and Particle Physics, 5(31), p. 409-416, 2005

DOI: 10.1088/0954-3899/31/5/011

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Search for Correlated High Energy Cosmic Ray Events with CHICOS

Journal article published in 2004 by B. E. Carlson ORCID, E. Brobeck, C. J. Jillings, Michelle B. Larson, T. W. Lynn, R. D. McKeown, James E. Hill, B. J. Falkowski, R. Seki, J. Sepikas, G. B. Yodh
This paper is available in a repository.
This paper is available in a repository.

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Abstract

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.