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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/14021

Title: Observation of the suppression of the flux of cosmic rays above 4×1019eV
Other Titles: Physical Review Letters
Authors: Pepe, Iuri Muniz
Abraham, J.
Abreu, P.
Aglietta, M.
Aguirre, C.
Keywords: Física nuclear;Raios cosmicos
Issue Date: 2008
Abstract: The energy spectrum of cosmic rays above 2.5×1018 eV, derived from 20 000 events recorded at the Pierre Auger Observatory, is described. The spectral index γ of the particle flux, J∝E-γ, at energies between 4×1018 eV and 4×1019 eV is 2.69±0.02(stat)±0.06(syst), steepening to 4.2±0.4(stat)±0.06(syst) at higher energies. The hypothesis of a single power law is rejected with a significance greater than 6 standard deviations. The data are consistent with the prediction by Greisen and by Zatsepin and Kuz’min.
Description: p. 1-7
URI: http://repositorio.ufba.br/ri/handle/ri/14021
ISSN: 0031-9007
Appears in Collections:Artigos Publicados em Periódicos (FIS)

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