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Measurement of the cosmic ray spectrum above 4×1018 eV using inclined events detected with the Pierre Auger Observatory

Abstract : A measurement of the cosmic-ray spectrum for energies exceeding 4×1018 eV is presented, which is based on the analysis of showers with zenith angles greater than 60∘ detected with the Pierre Auger Observatory between 1 January 2004 and 31 December 2013. The measured spectrum confirms a flux suppression at the highest energies. Above 5.3×1018 eV, the "ankle", the flux can be described by a power law E−γ with index γ=2.70±0.02(stat)±0.1(sys) followed by a smooth suppression region. For the energy (Es) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find Es=(5.12±0.25(stat)+1.0−1.2(sys))×1019 eV.
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http://hal.in2p3.fr/in2p3-01139193
Contributor : Sabine Starita <>
Submitted on : Friday, April 3, 2015 - 3:23:07 PM
Last modification on : Saturday, September 19, 2020 - 4:54:45 AM

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A. Aab, A. Cordier, Balázs Kégl, M. Avenier, C. Berat, et al.. Measurement of the cosmic ray spectrum above 4×1018 eV using inclined events detected with the Pierre Auger Observatory. Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2015, 08, 049 (25 p.). ⟨10.1088/1475-7516/2015/08/049⟩. ⟨in2p3-01139193⟩

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