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

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.

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

References in corpus (7)

• Correlation of the highest energy cosmic rays with nearby extragalactic objects
• Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei
• Upper limit on the cosmic-ray photon flux above 10^19 eV using the surface detector of the Pierre Auger Observatory
• Calibration of the Surface Array of the Pierre Auger Observatory
• Reconstruction of Longitudinal Profiles of Ultra-High Energy Cosmic Ray Showers from Fluorescence and Cherenkov Light Measurements
• The Optimum Distance at which to Determine the Size of a Giant Air Shower
• Power Laws and the Cosmic Ray Energy Spectrum

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