Features of the energy spectrum of cosmic rays above $2.5{\times} 10^{18}$ eV using the Pierre Auger Observatory
Creators: name: The Pierre Auger Collaboration
name: Aab, A.
name: Abreu, P.
name: Aglietta, M.
name: Albury, J. M.
name: Allekotte, I.
name: Almela, A.
name: Castillo, J. Alvarez
name: Alvarez-Muñiz, J.
name: Batista, R. Alves
name: Anastasi, G. A.
name: Anchordoqui, L.
name: Andrada, B.
name: Andringa, S.
name: Aramo, C.
name: Ferreira, P. R. Araújo
name: Asorey, H.
name: Assis, P.
name: Avila, G.
name: Badescu, A. M.
name: Bakalova, A.
name: Balaceanu, A.
name: Barbato, F.
name: Luz, R. J. Barreira
name: Becker, K. H.
name: Bellido, J. A.
name: Berat, C.
name: Bertaina, M. E.
name: Bertou, X.
name: Biermann, P. L.
name: Bister, T.
name: Biteau, J.
name: Blanco, A.
name: Blazek, J.
name: Bleve, C.
name: Boháčová, M.
name: Boncioli, D.
name: Bonifazi, C.
name: Arbeletche, L. Bonneau
name: Borodai, N.
name: Botti, A. M.
name: Brack, J.
name: Bretz, T.
name: Briechle, F. L.
name: Buchholz, P.
name: Bueno, A.
name: Buitink, S.
name: Buscemi, M.
name: Caballero-Mora, K. S.
name: Caccianiga, L.
name: Calcagni, L.
name: Cancio, A.
name: Canfora, F.
name: Caracas, I.
name: Carceller, J. M.
name: Caruso, R.
name: Castellina, A.
name: Catalani, F.
name: Cataldi, G.
name: Cazon, L.
name: Cerda, M.
name: Chinellato, J. A.
name: Choi, K.
name: Chudoba, J.
name: Chytka, L.
name: Clay, R. W.
name: Cerutti, A. C. Cobos
name: Colalillo, R.
name: Coleman, A.
name: Coluccia, M. R.
name: Conceição, R.
name: Condorelli, A.
name: Consolati, G.
name: Contreras, F.
name: Convenga, F.
name: Covault, C. E.
name: Dasso, S.
name: Daumiller, K.
name: Dawson, B. R.
name: Day, J. A.
name: de Almeida, R. M.
name: de Jesús, J.
name: de Jong, S. J.
name: De Mauro, G.
name: Neto, J. R. T. de Mello
name: De Mitri, I.
name: de Oliveira, J.
name: Franco, D. de Oliveira
name: de Souza, V.
name: De Vito, E.
name: Debatin, J.
name: del Río, M.
name: Deligny, O.
name: Dembinski, H.
name: Dhital, N.
name: Di Giulio, C.
name: Di Matteo, A.
name: Castro, M. L. Díaz
name: Dobrigkeit, C.
name: D'Olivo, J. C.
name: Dorosti, Q.
name: Anjos, R. C. dos
name: Dova, M. T.
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name: Epicoco, I.
name: Erdmann, M.
name: Escobar, C. O.
name: Etchegoyen, A.
name: Falcke, H.
name: Farmer, J.
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name: Fauth, A. C.
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name: Figueira, J. M.
name: Filipčič, A.
name: Fodran, T.
name: Freire, M. M.
name: Fujii, T.
name: Fuster, A.
name: Galea, C.
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name: García, B.
name: Vegas, A. L. Garcia
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name: Giaccari, U.
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name: Jurysek, J.
name: Kääpä, A.
name: Kampert, K. H.
name: Keilhauer, B.
name: Kemp, J.
name: Klages, H. O.
name: Kleifges, M.
name: Kleinfeller, J.
name: Köpke, M.
name: Mezek, G. Kukec
name: Lago, B. L.
name: LaHurd, D.
name: Lang, R. G.
name: de Oliveira, M. A. Leigui
name: Lenok, V.
name: Letessier-Selvon, A.
name: Lhenry-Yvon, I.
name: Presti, D. Lo
name: Lopes, L.
name: López, R.
name: Lorek, R.
name: Luce, Q.
name: Lucero, A.
name: Payeras, A. Machado
name: Malacari, M.
name: Mancarella, G.
name: Mandat, D.
name: Manning, B. C.
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name: Parra, A.
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name: Pelayo, R.
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name: Armand, J. Perez
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name: Rautenberg, J.
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name: Reininghaus, M.
name: Ridky, J.
name: Riehn, F.
name: Risse, M.
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name: de Carvalho, W. Rodrigues
name: Fernandez, G. Rodriguez
name: Rojo, J. Rodriguez
name: Roncoroni, M. J.
name: Roth, M.
name: Roulet, E.
name: Rovero, A. C.
name: Ruehl, P.
name: Saffi, S. J.
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name: Sarazin, F.
name: Sarmento, R.
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name: Schmidt, D.
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name: Schulz, A.
name: Sciutto, S. J.
name: Scornavacche, M.
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name: Suárez-Durán, M.
name: Sudholz, T.
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name: Supanitsky, A. D.
name: Šupík, J.
name: Szadkowski, Z.
name: Taboada, A.
name: Tapia, A.
name: Timmermans, C.
name: Tkachenko, O.
name: Tobiska, P.
name: Peixoto, C. J. Todero
name: Tomé, B.
name: Elipe, G. Torralba
name: Travaini, A.
name: Travnicek, P.
name: Trimarelli, C.
name: Trini, M.
name: Tueros, M.
name: Ulrich, R.
name: Unger, M.
name: Urban, M.
name: Vaclavek, L.
name: Vacula, M.
name: Galicia, J. F. Valdés
name: Valiño, I.
name: Valore, L.
name: van Vliet, A.
name: Varela, E.
name: Cárdenas, B. Vargas
name: Vásquez-Ramírez, A.
name: Veberič, D.
name: Ventura, C.
name: Quispe, I. D. Vergara
name: Verzi, V.
name: Vicha, J.
name: Villaseñor, L.
name: Vink, J.
name: Vorobiov, S.
name: Wahlberg, H.
name: Watson, A. A.
name: Weber, M.
name: Weindl, A.
name: Wiencke, L.
name: Wilczyński, H.
name: Winchen, T.
name: Wirtz, M.
name: Wittkowski, D.
name: Wundheiler, B.
name: Yushkov, A.
name: Zapparrata, O.
name: Zas, E.
name: Zavrtanik, D.
name: Zavrtanik, M.
name: Zehrer, L.
name: Zepeda, A.
name: Ziolkowski, M.
name: Zuccarello, F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report a measurement of the energy spectrum of cosmic rays above $2.5{\times} 10^{18}$ eV based on $215,030$ events. New results are presented: at about $1.3{\times} 10^{19}$ eV, the spectral index changes from $2.51 \pm 0.03 \textrm{ (stat.)} \pm 0.05 \textrm{ (sys.)}$ to $3.05 \pm 0.05 \textrm{ (stat.)}\pm 0.10\textrm{ (sys.)}$, evolving to $5.1\pm0.3\textrm{ (stat.)} \pm 0.1\textrm{ (sys.)}$ beyond $5{\times} 10^{19}$ eV, 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. The energy density in cosmic rays above $5{\times} 10^{18}$ eV is $(5.66 \pm 0.03 \textrm{ (stat.)} \pm 1.40 \textrm{ (sys.)} ) {\times} 10^{53}~$erg Mpc$^{-3}$.
description: Published version; 2 figures, 1 table