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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
Physical review letters, 09/2020, Letnik: 125, Številka: 12Journal Article
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.
