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Type: Journal article
Title: The energy spectrum of cosmic rays beyond the turn-down around 10¹⁷ eV as measured with the surface detector of the Pierre Auger Observatory
Other Titles: The energy spectrum of cosmic rays beyond the turn-down around 10(17) eV as measured with the surface detector of the Pierre Auger Observatory
Author: Pierre Auger Collaboration
Abreu, P.
Aglietta, M.
Albury, J.M.
Allekotte, I.
Almela, A.
Alvarez-Muñiz, J.
Alves Batista, R.
Anastasi, G.A.
Anchordoqui, L.
Andrada, B.
Andringa, S.
Aramo, C.
Araújo Ferreira, P.R.
Arteaga Velázquez, J.C.
Asorey, H.
Assis, P.
Avila, G.
Badescu, A.M.
Bakalova, A.
et al.
Citation: European Physical Journal C: Particles and Fields, 2021; 81(11):966-1-966-25
Publisher: Springer Science and Business Media LLC
Issue Date: 2021
ISSN: 1434-6044
Statement of
Pierre Auger Collaboration ... J.M.Albury ... J. A. Bellido ... R.W.Clay ... B.R.Dawson ... J. A. Day ... T. D. Grubb ... V. M. Harvey ... G. C. Hill ... B. C. Manning ... S. J. Saffi ... T. Sudholz ... et al.
Abstract: We present a measurement of the cosmic-ray spectrum above 100PeV using the part of the surface detector of the Pierre Auger Observatory that has a spacing of 750 m. An inflection of the spectrum is observed, confirming the presence of the so-called second-knee feature. The spectrum is then combined with that of the 1500m array to produce a single measurement of the flux, linking this spectral feature with the three additional breaks at the highest energies. The combined spectrum, with an energy scale set calorimetrically via fluorescence telescopes and using a single detector type, results in the most statistically and systematically precise measurement of spectral breaks yet obtained. These measurements are critical for furthering our understanding of the highest energy cosmic rays.
Rights: © The Author(s) 2021. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit
DOI: 10.1140/epjc/s10052-021-09700-w
Grant ID: ARC
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Appears in Collections:Earth and Environmental Sciences publications

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