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Title: Measurement of the cosmic ray spectrum above 4×10 18 eV using inclined events detected with the Pierre Auger Observatory

A measurement of the cosmic-ray spectrum for energies exceeding 4×10 18 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 5.3×10 18 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 (E s) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find E s=(5.12±0.25 (stat) +1.0 –1.2 (sys))×10 19 eV.
Authors:
 [1]
  1. Univ. Siegen, Siegen (Germany). et al.
Publication Date:
Report Number(s):
FERMILAB-PUB-15-099-AD-AE-CD-TD
Journal ID: ISSN 1475-7516; arXiv eprint number arXiv:1503.07786
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 08; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
Pierre Auger Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1234889

Aab, Alexander. Measurement of the cosmic ray spectrum above 4×1018 eV using inclined events detected with the Pierre Auger Observatory. United States: N. p., Web. doi:10.1088/1475-7516/2015/08/049.
Aab, Alexander. Measurement of the cosmic ray spectrum above 4×1018 eV using inclined events detected with the Pierre Auger Observatory. United States. doi:10.1088/1475-7516/2015/08/049.
Aab, Alexander. 2015. "Measurement of the cosmic ray spectrum above 4×1018 eV using inclined events detected with the Pierre Auger Observatory". United States. doi:10.1088/1475-7516/2015/08/049. https://www.osti.gov/servlets/purl/1234889.
@article{osti_1234889,
title = {Measurement of the cosmic ray spectrum above 4×1018 eV using inclined events detected with the Pierre Auger Observatory},
author = {Aab, Alexander},
abstractNote = {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.},
doi = {10.1088/1475-7516/2015/08/049},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 08,
volume = 2015,
place = {United States},
year = {2015},
month = {8}
}