Observation of the suppression of the flux of cosmic rays above $4\times 10^{19}$eV - INSPIRE

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Observation of the suppression of the flux of cosmic rays above $4\times 10^{19}$ eV

Pierre Auger

Collaboration

Jun, 2008

7 pages

Published in:

Phys.Rev.Lett. 101 (2008) 061101

e-Print:

0806.4302 [astro-ph]

DOI:

10.1103/PhysRevLett.101.061101

Report number:

FERMILAB-PUB-08-314-A-CD-TD

Experiments:

AUGER

View in:

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Abstract: (arXiv)

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.

Note:

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

96.50.sb
96.50.sd
98.70.Sa
95.85.Ry
cosmic radiation: energy spectrum
cosmic radiation: flux
GZK effect
detector: fluorescence
experimental results
Auger

References(28)

Figures(3)

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