@article{52a9c2702d19414bbed5e3f0570e0801,
title = "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.",
keywords = "cosmic ray experiments, ultra high energy cosmic rays",
author = "{The Pierre Auger Collaboration} and A. Aab and P. Abreu and M. Aglietta and Ahn, {E. J.} and {Al Samarai}, I. and Albuquerque, {I. F.M.} and I. Allekotte and P. Allison and A. Almela and {Alvarez Castillo}, J. and J. Alvarez-Mu{\~n}iz and {Alves Batista}, R. and M. Ambrosio and A. Aminaei and L. Anchordoqui and S. Andringa and C. Aramo and Aranda, {V. M.} and F. Arqueros and N. Arsene and H. Asorey and P. Assis and J. Aublin and M. Ave and M. Avenier and G. Avila and N. Awal and Badescu, {A. M.} and Barber, {K. B.} and J. B{\"a}uml and C. Baus and Beatty, {J. J.} and Becker, {K. H.} and Bellido, {J. A.} and C. Berat and Bertaina, {M. E.} and X. Bertou and Biermann, {P. L.} and P. Billoir and Blaess, {S. G.} and A. Blanco and M. Blanco and C. Bleve and H. Bl{\"u}mer and M. Boh{\'a}{\v c}ov{\'a} and D. Boncioli and C. Bonifazi and N. Borodai and J. Brack and G. Farrar",
note = "Publisher Copyright: {\textcopyright} 2015 IOP Publishing Ltd and Sissa Medialab srl.",
year = "2015",
month = aug,
day = "1",
doi = "10.1088/1475-7516/2015/08/049",
language = "English (US)",
volume = "2015",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing Ltd.",
number = "8",
}