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.

Aab, A;Abreu, P;Aglietta, M;Albury, J M;Allekotte, I;Almela, A;Alvarez Castillo, J;Alvarez-Muñiz, J;Alves Batista, R;Anastasi, G A;Anchordoqui, L;Andrada, B;Andringa, S;Aramo, C;Araújo Ferreira, P R;Asorey, H;Assis, P;Avila, G;Badescu, A M;Bakalova, A;Balaceanu, A;Barbato, F;Barreira Luz, R J;Becker, K H;Bellido, J A;Berat, C;Bertaina, M E;Bertou, X;Biermann, P L;Bister, T;Biteau, J;Blanco, A;Blazek, J;Bleve, C;Boháčová, M;Boncioli, D;Bonifazi, C;Bonneau Arbeletche, L;Borodai, N;Botti, A M;Brack, J;Bretz, T;Briechle, F L;Buchholz, P;Bueno, A;Buitink, S;Buscemi, M;Caballero-Mora, K S;Caccianiga, L;Calcagni, L;Cancio, A;Canfora, F;Caracas, I;Carceller, J M;Caruso, R;Castellina, A;Catalani, F;Cataldi, G;Cazon, L;Cerda, M;Chinellato, J A;Choi, K;Chudoba, J;Chytka, L;Clay, R W;Cobos Cerutti, A C;Colalillo, R;Coleman, A;Coluccia, M R;Conceição, R;Condorelli, A;Consolati, G;Contreras, F;Convenga, F;Covault, C E;Dasso, S;Daumiller, K;Dawson, B R;Day, J A;de Almeida, R M;de Jesús, J;de Jong, S J;De Mauro, G;de Mello Neto, J R T;De Mitri, I;de Oliveira, J;de Oliveira Franco, D;de Souza, V;De Vito, E;Debatin, J;Del Río, M;Deligny, O;Dembinski, H;Dhital, N;Di Giulio, C;Di Matteo, A;Díaz Castro, M L;Dobrigkeit, C;D'Olivo, J C;Dorosti, Q;Dos Anjos, R C;Dova, M T;Ebr, J;Engel, R;Epicoco, I;Erdmann, M;Escobar, C O;Etchegoyen, A;Falcke, H;Farmer, J;Farrar, G;Fauth, A C;Fazzini, N;Feldbusch, F;Fenu, F;Fick, B;Figueira, J M;Filipčič, A;Fodran, T;Freire, M M;Fujii, T;Fuster, A;Galea, C;Galelli, C;García, B;Garcia Vegas, A L;Gemmeke, H;Gesualdi, F;Gherghel-Lascu, A;Ghia, P L;Giaccari, U;Giammarchi, M;Giller, M;Glombitza, J;Gobbi, F;Gollan, F;Golup, G;Gómez Berisso, M;Gómez Vitale, P F;Gongora, J P;González, N;Goos, I;Góra, D;Gorgi, A;Gottowik, M;Grubb, T D;Guarino, F;Guedes, G P;Guido, E;Hahn, S;Halliday, R;Hampel, M R;Hansen, P;Harari, D;Harvey, V M;Haungs, A;Hebbeker, T;Heck, D;Hill, G C;Hojvat, C;Hörandel, J R;Horvath, P;Hrabovský, M;Huege, T;Hulsman, J;Insolia, A;Isar, P G;Johnsen, J A;Jurysek, J;Kääpä, A;Kampert, K H;Keilhauer, B;Kemp, J;Klages, H O;Kleifges, M;Kleinfeller, J;Köpke, M;Kukec Mezek, G;Lago, B L;LaHurd, D;Lang, R G;Leigui de Oliveira, M A;Lenok, V;Letessier-Selvon, A;Lhenry-Yvon, I;Lo Presti, D;Lopes, L;López, R;Lorek, R;Luce, Q;Lucero, A;Machado Payeras, A;Malacari, M;Mancarella, G;Mandat, D;Manning, B C;Manshanden, J;Mantsch, P;Marafico, S;Mariazzi, A G;Mariş, I C;Marsella, G;Martello, D;Martinez, H;Martínez Bravo, O;Mastrodicasa, M;Mathes, H J;Matthews, J;Matthiae, G;Mayotte, E;Mazur, P O;Medina-Tanco, G;Melo, D;Menshikov, A;Merenda, K-D;Michal, S;Micheletti, M I;Miramonti, L;Mockler, D;Mollerach, S;Montanet, F;Morello, C;Mostafá, M;Müller, A L;Muller, M A;Mulrey, K;Mussa, R;Muzio, M;Namasaka, W M;Nellen, L;Nguyen, P H;Niculescu-Oglinzanu, M;Niechciol, M;Nitz, D;Nosek, D;Novotny, V;Nožka, L;Nucita, A;Núñez, L A;Palatka, M;Pallotta, J;Panetta, M P;Papenbreer, P;Parente, G;Parra, A;Pech, M;Pedreira, F;Pȩkala, J;Pelayo, R;Peña-Rodriguez, J;Perez Armand, J;Perlin, M;Perrone, L;Peters, C;Petrera, S;Pierog, T;Pimenta, M;Pirronello, V;Platino, M;Pont, B;Pothast, M;Privitera, P;Prouza, M;Puyleart, A;Querchfeld, S;Rautenberg, J;Ravignani, D;Reininghaus, M;Ridky, J;Riehn, F;Risse, M;Ristori, P;Rizi, V;Rodrigues de Carvalho, W;Rodriguez Fernandez, G;Rodriguez Rojo, J;Roncoroni, M J;Roth, M;Roulet, E;Rovero, A C;Ruehl, P;Saffi, S J;Saftoiu, A;Salamida, F;Salazar, H;Salina, G;Sanabria Gomez, J D;Sánchez, F;Santos, E M;Santos, E;Sarazin, F;Sarmento, R;Sarmiento-Cano, C;Sato, R;Savina, P;Schäfer, C;Scherini, V;Schieler, H;Schimassek, M;Schimp, M;Schlüter, F;Schmidt, D;Scholten, O;Schovánek, P;Schröder, F G;Schröder, S;Schulz, A;Sciutto, S J;Scornavacche, M;Shellard, R C;Sigl, G;Silli, G;Sima, O;Šmída, R;Sommers, P;Soriano, J F;Souchard, J;Squartini, R;Stadelmaier, M;Stanca, D;Stanič, S;Stasielak, J;Stassi, P;Streich, A;Suárez-Durán, M;Sudholz, T;Suomijärvi, T;Supanitsky, A D;Šupík, J;Szadkowski, Z;Taboada, A;Tapia, A;Timmermans, C;Tkachenko, O;Tobiska, P;Todero Peixoto, C J;Tomé, B;Torralba Elipe, G;Travaini, A;Travnicek, P;Trimarelli, C;Trini, M;Tueros, M;Ulrich, R;Unger, M;Urban, M;Vaclavek, L;Vacula, M;Valdés Galicia, J F;Valiño, I;Valore, L;van Vliet, A;Varela, E;Vargas Cárdenas, B;Vásquez-Ramírez, A;Veberič, D;Ventura, C;Vergara Quispe, I D;Verzi, V;Vicha, J;Villaseñor, L;Vink, J;Vorobiov, S;Wahlberg, H;Watson, A A;Weber, M;Weindl, A;Wiencke, L;Wilczyński, H;Winchen, T;Wirtz, M;Wittkowski, D;Wundheiler, B;Yushkov, A;Zapparrata, O;Zas, E;Zavrtanik, D;Zavrtanik, M;Zehrer, L;Zepeda, A;Ziolkowski, M;Zuccarello, F;, ;
physical review letters 2020 Vol. 125 pp. 121106
199
aab2020featuresphysical

Abstract

We report a measurement of the energy spectrum of cosmic rays above 2.5×10^{18}  eV based on 215 030 events. New results are presented: at about 1.3×10^{19}  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 5×10^{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 5×10^{18}  eV is [5.66±0.03(stat)±1.40(syst)]×10^{53}  erg Mpc^{-3}.

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