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Journal Articles Journal of Cosmology and Astroparticle Physics Year : 2015

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

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A. Aab
  • Function : Author
Imen Al Samarai
Pascal Lautridou
Lilian Martin
Benoît Revenu

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.

Dates and versions

in2p3-01139193 , version 1 (03-04-2015)

Identifiers

Cite

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, 2015, 08, 049 (25 p.). ⟨10.1088/1475-7516/2015/08/049⟩. ⟨in2p3-01139193⟩
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