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Type: Journal article
Title: Measurement of the cosmic ray spectrum above 4 × 10¹⁸ eV using inclined events detected with the Pierre Auger Observatory
Other Titles: Measurement of the cosmic ray spectrum above 4 x 10(18) eV using inclined events detected with the Pierre Auger Observatory
Author: Aab, A.
Abreu, P.
Aglietta, M.
Ahn, E.
Al Samarai, I.
Albuquerque, I.
Allekotte, I.
Allison, P.
Almela, A.
Alvarez Castillo, J.
Alvarez-Muñiz, J.
Alves Batista, R.
Ambrosio, M.
Aminaei, A.
Anchordoqui, L.
Andringa, S.
Aramo, C.
Aranda, V.
Arqueros, F.
Arsene, N.
et al.
Citation: Journal of Cosmology and Astroparticle Physics, 2015; 2015(8):049-1-049-23
Publisher: IOP Publishing
Issue Date: 2015
ISSN: 1475-7516
Statement of
A. Aab ... Jose A. Bellido Caceres ... Simon G. Blaess ... Roger W. Clay ... Bruce R. Dawson ... Trent D. Grubb ... Thomas A. Harrison ... Gary C. Hill ... Maximus D. Malacari ... Phong H. Nguyen ... Steven J. Saffi ... Fred Sarazin ... Jennifer S. Sorokin ... Patrick Van Bodegom ... Liu Lu ... Yun-Pei Zhu ... et al.
Abstract: A measurement of the cosmic-ray spectrum for energies exceeding 4×10<sup>18</sup> 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<sup>18</sup> eV, the "ankle", the flux can be described by a power law E<sup>-γ</sup> with index γ=2.70 ± 0.02 (stat) ± 0.1 (sys) followed by a smooth suppression region. For the energy (E<inf>s</inf>) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find E<inf>s</inf>=(5.12 ± 0.25 (stat)<sup>+1.0</sup><inf>-1.2</inf> (sys))×10<sup>19</sup> eV.
Keywords: Ultra high energy cosmic rays; cosmic ray experiments
Description: The Pierre Auger collaboration
Rights: © 2015 IOP Publishing Ltd and Sissa Medialab srl.
DOI: 10.1088/1475-7516/2015/08/049
Grant ID: ARC
Published version:
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