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

Alexander Aab , Pedro Abreu , Marco Aglietta , Justin M Albury , Ingomar Allekotte , Alejandro Almela , Jesus Alvarez Castillo , Jaime Alvarez-Muñiz , Rafael Alves Batista , Gioacchino Alex Anastasi , Luis Anchordoqui , Belén Andrada , Sofia Andringa , Carla Aramo , Paulo Ricardo Araújo Ferreira , Hernán Gonzalo Asorey , Pedro Assis , Gualberto Avila , Alina Mihaela Badescu , Alena Bakalova , Alexandru Balaceanu , Felicia Barbato , Ricardo Jorge Barreira Luz , Karl-Heinz Becker , Jose A Bellido , Corinne Berat (1) , Mario Edoardo Bertaina , Xavier Bertou , Peter Biermann , Terasa Bister , Jonathan Biteau (2) , Alberto Blanco , Jiri Blazek , Carla Bleve (1) , Martina Boháčová , Denise Boncioli , Carla Bonifazi , Luan Bonneau Arbeletche , Nataliia Borodai , Ana Martina Botti , Jeffrey Brack , Thomas Bretz , Florian Lukas Briechle , Peter Buchholz , Antonio Bueno , Stijn Buitink , Mario Buscemi , Karen S Caballero-Mora , Lorenzo Caccianiga , Laura Calcagni , Ángel Cancio , Fabrizia Canfora , Ioana Caracas , Juan Miguel Carceller , Rossella Caruso , Antonella Castellina , Fernando Catalani , Gabriella Cataldi , Lorenzo Cazon , Marcos Cerda , Jose Augusto Chinellato , Koun Choi , Jiri Chudoba , Ladislav Chytka , Roger W Clay , Agustín Cobos Cerutti , Roberta Colalillo , Alan Coleman , Maria Rita Coluccia , Ruben Conceição , Antonio Condorelli , Giovanni Consolati , Fernando Contreras , Fabio Convenga , Corbin Covault , Sergio Dasso , Kai Daumiller , Bruce R Dawson , Jarryd A Day , Rogerio M de Almeida , Joaquín de Jesús , Sijbrand J de Jong , Giuseppe de Mauro , Joao de Mello Neto , Ivan de Mitri , Jaime de Oliveira , Danelise de Oliveira Franco , Vitor de Souza , Emanuele de Vito , Joachim Debatin , Mariano del Río , Olivier Deligny (2) , Hans Dembinski , Niraj Dhital , Claudio Di Giulio , Armando Di Matteo , Mary Lucia Díaz Castro , Carola Dobrigkeit , Juan Carlos d'Olivo , Qader Dorosti , Rita dos Anjos , Maria Teresa Dova , Jan Ebr , Ralph Engel , Italo Epicoco , Martin Erdmann , Carlos O Escobar , Alberto Etchegoyen , Heino Falcke , John Farmer , Glennys Farrar , Anderson Fauth , Norberto Fazzini , Fridtjof Feldbusch , Francesco Fenu , Brian Fick , Juan Manuel Figueira , Andrej Filipčič , Tomas Fodran , Martín Miguel Freire , Toshihiro Fujii , Alan Fuster , Cristina Galea , Claudio Galelli , Beatriz García , Adrianna Luz Garcia Vegas , Hartmut Gemmeke , Flavia Gesualdi , Alexandru Gherghel-Lascu , Piera Luisa Ghia (2) , Ugo Giaccari , Marco Giammarchi , Maria Giller , Jonas Glombitza , Fabian Gobbi , Fernando Gollan , Geraldina Golup , Mariano Gómez Berisso , Primo F Gómez Vitale , Juan Pablo Gongora , Nicolás González , Isabel Goos , Dariusz Góra , Alessio Gorgi , Marvin Gottowik , Trent D Grubb , Fausto Guarino , Germano Guedes , Eleonora Guido , Steffen Hahn , Robert Halliday , Matías Rolf Hampel , Patricia Hansen , Diego Harari , Violet M Harvey , Andreas Haungs , Thomas Hebbeker , Dieter Heck , Gary C Hill , Carlos Hojvat , Jörg Hörandel , Pavel Horvath , Miroslav Hrabovský , Tim Huege , Johannes Hulsman , Antonio Insolia , Paula Gina Isar , Jeffrey A Johnsen , Jakub Jurysek , Alex Kääpä , Karl-Heinz Kampert , Bianca Keilhauer , Julian Kemp , Hans Klages , Matthias Kleifges , Jonny Kleinfeller , Marcel Köpke , Gasper Kukec Mezek , Bruno L Lago , Danielle Lahurd , Rodrigo Guedes Lang , Marcelo Augusto Leigui de Oliveira , Vladimir Lenok , Antoine Letessier-Selvon (3) , Isabelle Lhenry-Yvon (2) , Domenico Lo Presti , Luis Lopes , Rebeca López , Ryan Lorek , Quentin Luce , Agustin Lucero , Allan Machado Payeras , Max Malacari , Giovanni Mancarella , Dusan Mandat , Bradley C Manning , Julien Manshanden , Paul Mantsch , Sullivan Marafico (2) , Analisa Mariazzi , Ioana Mariş , Giovanni Marsella , Daniele Martello , Humberto Martinez , Oscar Martínez Bravo , Massimo Mastrodicasa , Hermann-Josef Mathes , James Matthews , Giorgio Matthiae , Eric Mayotte , Peter Mazur , Gustavo Medina-Tanco , Diego Melo , Alexander Menshikov , Kevin-Druis Merenda , Stanislav Michal , Maria Isabel Micheletti , Lino Miramonti , Daniela Mockler , Silvia Mollerach , François Montanet (1) , Carlo Morello , Miguel Mostafá , Ana L Müller , Marcio Aparecido Muller , Katharine Mulrey , Roberto Mussa , Marco Muzio , Wilson M Namasaka , Lukas Nellen , Phong H Nguyen , Mihai Niculescu-Oglinzanu , Marcus Niechciol , Dave Nitz , Dalibor Nosek , Vladimir Novotny , Libor Nožka , Achille Nucita , Luis Núñez , Miroslav Palatka , Juan Pallotta , Maria Paola Panetta , Philipp Papenbreer , Gonzalo Parente , Alejandra Parra , Miroslav Pech , Francisco Pedreira , Jan Pękala , Rodrigo Pelayo , Jesús Peña-Rodriguez , Johnnier Perez Armand , Matías Perlin , Lorenzo Perrone , Christine Peters , Sergio Petrera , Tanguy Pierog , Mário Pimenta , Valerio Pirronello , Manuel Platino , Bjarni Pont , Mart Pothast , Paolo Privitera , Michael Prouza , Andrew Puyleart , Sven Querchfeld , Julian Rautenberg , Diego Ravignani , Maximilian Reininghaus , Jan Ridky , Felix Riehn , Markus Risse , Pablo Ristori , Vincenzo Rizi , Washington Rodrigues de Carvalho , Gonzalo Rodriguez Fernandez , Jorge Rubén Rodriguez Rojo , Matías J Roncoroni , Markus Roth , Esteban Roulet , Adrian Rovero , Philip Ruehl , Steven J Saffi , Alexandra Saftoiu , Francesco Salamida , Humberto Salazar , Gaetano Salina , Jose Sanabria Gomez , Federico Sánchez , Edivaldo Moura Santos , Eva Santos , Fred Sarazin , Raul Sarmento , Christian Sarmiento-Cano , Ricardo Sato , Pierpaolo Savina (2) , Christoph Schäfer , Viviana Scherini , Harald Schieler , Martin Schimassek , Michael Schimp , Felix Schlüter , David Schmidt , Olaf Scholten , Petr Schovánek , Frank G Schröder , Sonja Schröder , Alexander Schulz , Sergio Sciutto , Marina Scornavacche , Ronald C Shellard , Guenter Sigl , Gaia Silli , Octavian Sima , Radomir Šmída , Paul Sommers , Jorge F Soriano , Julien Souchard (1) , Ruben Squartini , Maximilian Stadelmaier , Denis Stanca , Samo Stanič , Jaroslaw Stasielak , Patrick Stassi (1) , Alexander Streich , Mauricio Suárez-Durán , Tristan Sudholz , Tiina Suomijärvi (2) , a Daniel Supanitsky , Jan Šupík , Zbigniew Szadkowski , Alvaro Taboada , Alex Tapia , Charles Timmermans , Olena Tkachenko , Petr Tobiska , Carlos J Todero Peixoto , Bernardo Tomé , Guillermo Torralba Elipe , Andres Travaini , Petr Travnicek , Caterina Trimarelli , Marta Trini , Matias Tueros , Ralf Ulrich , Michael Unger , Martin Urban , Lukáš Vaclavek , Martin Vacula , Jose F Valdés Galicia , Ines Valiño , Laura Valore , Arjen van Vliet , Enrique Varela , Bernardo Vargas Cárdenas , Adriana Vásquez-Ramírez , Darko Veberič , Cynthia Ventura , Indira D Vergara Quispe , Valerio Verzi , Jakub Vicha , Luis Villaseñor , Jacco Vink , Serguei Vorobiov , Hernan Wahlberg , Alan Watson , Marc Weber , Andreas Weindl , Lawrence Wiencke , Henryk Wilczyński , Tobias Winchen , Marcus Wirtz , David Wittkowski , Brian Wundheiler , Alexey Yushkov , Orazio Zapparrata , Enrique Zas , Danilo Zavrtanik , Marko Zavrtanik , Lukas Zehrer , Arnulfo Zepeda , Michael Ziolkowski , Francesca Zuccarello

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
3 LPNHE (UMR_7585) - Laboratoire de Physique Nucléaire et de Hautes Énergies

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.

Mots clés: Gravitation and Astrophysics; cosmic radiation: energy spectrum; energy: density; energy dependence; power spectrum; mass spectrum; observatory; spectral; Auger; 5/3

Domaines: Astrophysique [astro-ph]

Alexander Aab, Pedro Abreu, Marco Aglietta, Justin M Albury, Ingomar Allekotte, et al.. Features of the Energy Spectrum of Cosmic Rays above 2.5×10$^{18}$ eV Using the Pierre Auger Observatory. Physical Review Letters, 2020, 125 (12), pp.121106. ⟨10.1103/PhysRevLett.125.121106⟩. ⟨hal-02934051⟩