Observation of the Suppression of the Flux of Cosmic Rays above 4 × 1019  eV

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dc.contributor.author Santander, Marcos
dc.date.accessioned 2019-07-03T15:26:45Z
dc.date.available 2019-07-03T15:26:45Z
dc.date.copyright 2008
dc.date.issued 2008-08-04
dc.identifier.citation Abraham, J., et al. (2008): Observation of the Suppression of the Flux of Cosmic Rays above 4 × 1019 eV. Physical Review Letters, 101(6). DOI: http://dx.doi.org/10.1103/PhysRevLett.101.061101 en_US
dc.identifier.issn 0031-9007
dc.identifier.uri http://ir.ua.edu/handle/123456789/5893
dc.description.abstract The energy spectrum of cosmic rays above 2.5 x 10^18 eV, derived from 20 000 events recorded at the Pierre Auger Observatory, is described. The spectral index γ of the particle flux, J ∝ E^-y, at energies between 4 x 10^18 eV and 4 X 10^19 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. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.publisher American Physical Society en_US
dc.subject Cosmic rays en_US
dc.subject Neutrino, muon, pion, and other elementary particles en_US
dc.subject Composition, energy spectra and interactions en_US
dc.subject Extensive air showers en_US
dc.title Observation of the Suppression of the Flux of Cosmic Rays above 4 × 1019  eV en_US
dc.type text en_US
dc.rights.holder American Physical Society en_US


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