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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/6429

Title: Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
Other Titles: Astroparticle Physics
Authors: Pepe, Iuri Muniz
Abraham, J.
Abreu, P.
Barroso, S. L. C.
Aglietta, M.
Issue Date: 2009
Publisher: Elsevier
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 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.
Description: Trabalho completo: acesso restrito, p.399–406
URI: http://www.repositorio.ufba.br/ri/handle/ri/6429
ISSN: 0927-6505
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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