Measurement of the cosmic ray spectrum above 4×1018 eV using inclined events detected with the Pierre Auger Observatory
- Aab, A.
- Cordier, A.
- Kégl, Balázs
- Avenier, M.
- Berat, C.
- Le Coz, S.
- Lebrun, D.
- Louedec, K.
- Montanet, F.
- Stutz, A.
- Samarai, Imen Al
- Deligny, O.
- Lhenry-Yvon, I.
- Martraire, D.
- Salamida, F.
- Suomijärvi, T.
- Aublin, J.
- Billoir, P.
- Caccianiga, L.
- Dallier, Richard
- Gate, F.
- Ghia, P.L.
- Lautridou, Pascal
- Letessier-Selvon, A.
- Maller, J.
- Marin, V.
- Martin, Lilian
- Ravel, O.
- Revenu, Benoît
DOIAbstract
22 pages, 9 figures, submitted to Journal of Cosmology and Astroparticle Physics (JCAP) - See paper for full list of authorsInternational audienceA 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 suppr...
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