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Sokolsky, Pierre | Observation of the suppression of the flux of cosmic rays above 4×10^19eV | 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-γ, 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 ... | Extensive air showers; Energy spectrum; Fluorescence; Suppression | 2008-08 |
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