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

dc.creatorAbraham, J.
dc.creatorPepe, Iuri Muniz
dc.creatorAbreu, P.
dc.creatorAglietta, M.
dc.creatorAguirre, C.
dc.creatorAhn, E. J.
dc.creatorAbraham, J.
dc.creatorPepe, Iuri Muniz
dc.creatorAbreu, P.
dc.creatorAglietta, M.
dc.creatorAguirre, C.
dc.creatorAhn, E. J.
dc.date.accessioned2022-10-07T18:38:02Z
dc.date.available2022-10-07T18:38:02Z
dc.date.issued2009
dc.identifier0927-6505
dc.identifierhttp://repositorio.ufba.br/ri/handle/ri/13777
dc.identifierv. 31, n. 6
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/4011896
dc.description.abstractFrom 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 View the MathML source, 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.languageen
dc.rightsAcesso Aberto
dc.sourcehttp://dx.doi.org/10.1016/j.astropartphys.2009.04.003
dc.titleUpper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
dc.typeArtigo Publicado em Periódico


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