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

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

dc.contributor.author	The Pierre Auger Collaboration
dc.contributor.author	Pastor Carpi, Sergio
dc.contributor.author	Pinto, Teguayco
dc.date.accessioned	2015-11-03T13:27:17Z
dc.date.available	2015-11-03T13:27:17Z
dc.date.issued	2009
dc.identifier.uri	http://hdl.handle.net/10550/48022
dc.description.abstract	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. These are the first experimental limits on ultra-high energy photons at energies below 10 EeV. The results complement previous constraints on top-down models from array data and they reduce systematic uncertainties in the interpretation of shower data in terms of primary flux, nuclear composition and proton-air cross-section.
dc.language.iso	eng
dc.relation.ispartof	Astroparticle Physics, 2009, vol. 31, num. 6, p. 399-406
dc.rights.uri	info:eu-repo/semantics/openAccess
dc.source	The Pierre Auger Collaboration Pastor Carpi, Sergio Pinto, Teguayco 2009 Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory Astroparticle Physics 31 6 399 406
dc.subject	Física
dc.title	Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
dc.type	info:eu-repo/semantics/article
dc.date.updated	2015-11-03T13:27:17Z
dc.identifier.doi	http://dx.doi.org/10.1016/j.astropartphys.2009.04.003
dc.identifier.idgrec	060096