Features of the Energy Spectrum of Cosmic Rays above 2.5 × 10 18  eV Using the Pierre Auger Observatory

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URI: http://hdl.handle.net/10347/32686
ISSN: 1079-7114
DOI: 10.1103/PhysRevLett.125.121106

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2020-07-31

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American Physical Society
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Abstract

We report a measurement of the energy spectrum of cosmic rays above 2.5×1018  eV based on 215 030 events. New results are presented: at about 1.3×1019eV, the spectral index changes from 2.51±0.03(stat)±0.05(syst) to 3.05±0.05 (stat) ±0.10 (syst), evolving to 5.1±0.3 (stat) ±0.1 (syst) beyond 5×1019e, while no significant dependence of spectral features on the declination is seen in the accessible range. These features of the spectrum can be reproduced in models with energy-dependent mass composition. .

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Cosmic ray & astroparticle detectors| Cosmic ray aceleration| Cosmic ray composition & spectra| Cosmic ray propagation| Cosmic ray sources

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Aab, A., Álvarez Muñiz, Jaime, Parente Bermúdez, Gonzalo, Zuccarello, F. et al (2020): Features of the Energy Spectrum of Cosmic Rays above 2.5 × 10 18     eV Using the Pierre Auger Observatory, en Phys. Rev. Lett. 125 (2020) 121106

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Xunta de Galicia (ED431C 2017/07), Junta de Andalucía (SOMM17/6104/UGR), Feder Funds, RENATA Red Nacional Temática e María de Maeztu Unit of Excellence (MDM-2016-0692)

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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI

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