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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/5862

Title: Measurement of the energy spectrum of cosmic rays above 1018 eV using the Pierre Auger Observatory
Other Titles: Physics Letters B
Authors: Abraham, J.
Abreu, P.
Aglietta, M.
Ahn, E. J.
Allard, D.
Allen, J.
Alvarez Muñiz, J.
Pepe, Iuri Muniz
Keywords: Pierre Auger Observatory;Cosmic rays;Energy spectrum
Issue Date: 8-Mar-2010
Publisher: Elsevier
Abstract: We report a measurement of the flux of cosmic rays with unprecedented precision and statistics using the Pierre Auger Observatory. Based on fluorescence observations in coincidence with at least one surface detector we derive a spectrum for energies above 1018 eV. We also update the previously published energy spectrum obtained with the surface detector array. The two spectra are combined addressing the systematic uncertainties and, in particular, the influence of the energy resolution on the spectral shape. The spectrum can be described by a broken power law E−γ with index γ=3.3 below the ankle which is measured at log10(Eankle/eV)=18.6. Above the ankle the spectrum is described by a power law with index 2.6 followed by a flux suppression, above about log10(E/eV)=19.5, detected with high statistical significance.
Description: Trabalho completo: acesso restrito, p. 239–246
URI: http://www.repositorio.ufba.br/ri/handle/ri/5862
ISSN: 0370-2693
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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