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Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2008-06-26
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics
Subject Keyword Astrophysics ♦ physics:astro-ph
Abstract The energy spectrum of cosmic rays above 2.5x10^18eV, derived from 20,000 events recorded at the Pierre Auger Observatory, is described. The spectral index gamma of the flux, J ~ E^-gamma, at energies between 4x10^18eV and 4x10^19eV is 2.69+-0.02(stat)+-0.06(syst), steepening to 4.2+-0.4(stat)+-0.06(syst) at higher energies, consistent with the prediction by Greisen and by Zatsepin and Kuz'min.
Description Comment: 7 pages, 2 figues, accepted for publication in Physics Review Letters
Reference: Phys.Rev.Lett.101:061101,2008
Educational Use Research
Learning Resource Type Article
Organization The Pierre Auger Collaboration
Page Count 7


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