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https://repositorio.ufba.br/handle/ri/14021
metadata.dc.type: | Artigo de Periódico |
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. |
metadata.dc.creator: | Pepe, Iuri Muniz Abraham, J. Abreu, P. Aglietta, M. Aguirre, C. |
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. |
Keywords: | Física nuclear Raios cosmicos |
metadata.dc.publisher.country: | Brasil |
metadata.dc.rights: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/14021 |
Issue Date: | 2008 |
Appears in Collections: | Artigo Publicado em Periódico (FIS) |
Files in This Item:
File | Description | Size | Format | |
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10.1103PhysRevLett.101.061101.pdf | 263,07 kB | Adobe PDF | View/Open |
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