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Elsevier, Nuclear Physics B - Proceedings Supplements, 1(151), p. 116-118

DOI: 10.1016/j.nuclphysbps.2005.07.021

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On a possible photon origin of the most-energetic AGASA events.

Journal article published in 2006 by P. Homola, M. Risse, R. Engel, D. Gora, D. Heck, J. Pekala ORCID, B. Wilczynska, H. Wilczynski
This paper is available in a repository.
This paper is available in a repository.

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Abstract

In this work the ultra high energy cosmic ray events recorded by the AGASA experiment are analysed. With detailed simulations of the extensive air showers initiated by photons, the probabilities are determined of the photonic origin of the 6 AGASA events for which the muon densities were measured and the reconstructed energies exceeded 10^20 eV. On this basis a new, preliminary upper limit on the photon fraction in cosmic rays above 10^20 eV is derived and compared to the predictions of exemplary top-down cosmic-ray origin models. Comment: 3 pages, 1 figure, 2 tables; presented at XIII ISVHECRI, Pylos, Greece