Observation of the suppression of the flux of cosmic rays above 4x10^19eV

Details Observation of the suppression of the flux of cosmic rays above 4x10^19eV Observation of the suppression of the flux of cosmic rays above 4x10^19eV

2008-06-26

arxiv.org/abs/0806.4302v1

Phys.Rev.Lett.101:061101,2008

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figues, accepted for publication in Physics Review Letters

Scientific paper

10.1103/PhysRevLett.101.061101

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.

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