$Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory$

Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory

From direct observations of the longitudinal development of ultra-high energy air showers performed with the Pierre Auger Observatory, upper limits of 3.8%, 2.4%, 3.5% and 11.7% (at 95% c.l.) are obtained on the fraction of cosmic-ray photons above 2, 3, 5 and 10 EeV (1 EeV = 10^18 eV) respectively....

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Bibliographic Details
Main Authors:	Collaboration, TPA, Abraham, J, Abreu, P, Aglietta, M, Aguirre, C, Ahn, E, Allard, D, Allekotte, I, Allen, J, Allison, P, Alvarez-Muñiz, J, Ambrosio, M, Anchordoqui, L, Andringa, S, Anzalone, A, Aramo, C, Argiró, S, Arisaka, K, Arneodo, F, Arqueros, F, Asch, T, Asorey, H, Assis, P, Aublin, J, Ave, M
Format:	Journal article
Language:	English
Published:	2009

Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory

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