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

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

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 1.3×1019 eV, 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 5×1019 eV,...

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Veröffentlicht in:	Phys.Rev.Lett 2020-09, Vol.125 (12), p.121106-121106
Hauptverfasser:	Albury, J M, Alves Batista, R, Andrada, B, Asorey, H, Badescu, A M, Balaceanu, A, Becker, K H, Biermann, P L, Biteau, J, Bleve, C, Boháčová, M, Bonifazi, C, Borodai, N, Botti, A M, Briechle, F L, Buchholz, P, Bueno, A, Buitink, S, Calcagni, L, Carceller, J M, Castellina, A, Chinellato, J A, Condorelli, A, de Almeida, R M, de Jong, S J, De Mitri, I, Dhital, N, Dos Anjos, R C, Ebr, J, Escobar, C O, Etchegoyen, A, Fazzini, N, Fick, B, Figueira, J M, Freire, M M, Gherghel-Lascu, A, Ghia, P L, Gobbi, F, González, N, Góra, D, Grubb, T D, Guedes, G P, Hahn, S, Hulsman, J, Isar, P G, Kleifges, M, Köpke, M, Lago, B L, Lenok, V, Lhenry-Yvon, I, Lorek, R, Machado Payeras, A, Manshanden, J, Mantsch, P, Mariş, I C, Martello, D, Mastrodicasa, M, Mazur, P O, Medina-Tanco, G, Micheletti, M I, Mostafá, M, Nellen, L, Niechciol, M, Pech, M, Pȩkala, J, Platino, M, Reininghaus, M, Risse, M, Ristori, P, Roth, M, Rovero, A C, Sarazin, F, Sarmiento-Cano, C, Savina, P, Schäfer, C, Scherini, V, Schimassek, M, Schovánek, P, Schröder, S, Schulz, A, Sciutto, S J, Shellard, R C, Sigl, G, Sima, O, Šmída, R, Soriano, J F, Stanca, D, Stasielak, J, Torralba Elipe, G, Trimarelli, C, Valdés Galicia, J F, van Vliet, A, Varela, E, Villaseñor, L, Vink, J, Weindl, A, Wiencke, L, Wilczyński, H, Wirtz, M, Zehrer, L
Format:	Artikel
Sprache:	eng
Schlagworte:	Astrophysics Physics
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Beschreibung
Zusammenfassung:	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 1.3×1019 eV, 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 5×1019 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 5×1018 eV is [5.66±0.03(stat)±1.40(syst)]×1053 erg Mpc-3.
ISSN:	1079-7114
DOI:	10.1103/PhysRevLett.125.121106