Measurement of the cosmic ray spectrum above \(4{\times}10^{18}\) eV using inclined events detected with the Pierre Auger Observatory

• Published in: arXiv.org
• Main Authors: Albuquerque, Ivone, Almela, Alejandro, Jesus Alvarez Castillo, Amin Aminaei, Anchordoqui, Luis, Aranda, Victor Manuel, Arqueros, Fernando, Arsene, Nicusor, Awal, Nafiun, Bäuml, Julia, Beatty, Jim, Bellido, Jose A, Bertou, Xavier, Blaess, Simon G, Blanco, Miguel, Brogueira, Pedro, Candusso, Marina, Caramete, Laurentiu, Chiavassa, Andrea, Cooper, Mathew J, Coutu, Stephane, de Almeida, Rogerio M, de Jong, Sijbrand J, Dhital, Niraj, Díaz Castro, Mary Lucia, Diogo, Francisco, Dobrigkeit, Carola, Escobar, Carlos O, Espadanal, Joao, Falcke, Heino, Ferguson, Andrew P, Fernandes, Mateus, Fick, Brian, Fratu, Octavian, Gherghel-Lascu, Alexandru, Ghia, Piera Luisa, Glaser, Christian, Mariano Gómez Berisso, Guarino, Fausto, Heimann, Philipp, Hollon, Nicholas, Homola, Piotr, Hrabovský, Miroslav, Insolia, Antonio, Kieckhafer, Roger, Krömer, Oliver, Kunka, Norbert, Latronico, Luca, Sandra Le Coz, Lebrun, Paul, Aida López Casado, Maller, Jennifer, Mantsch, Paul, Mariş, Ioana, Martin, Lilian, Maurel, Detlef, Medina-Tanco, Gustavo, Melo, Diego, Menshikov, Alexander, Mitrica, Bogdan, Molina-Bueno, Laura, Mollerach, Silvia, Navas, Sergio, Niechciol, Marcus, Nosek, Dalibor, Novotny, Vladimir, Olmos-Gilbaja, Victor, Parente, Gonzalo, Piegaia, Ricardo, Pimenta, Mário, Pirronello, Valerio, Porcelli, Alessio, Ravignani, Diego, Risse, Markus, Ristori, Pablo, Rizi, Vincenzo, Gonzalo Rodriguez Fernandez, Rodríguez-Frías, Maria Dolores, Roulet, Esteban, Saleh, Ahmed, Salina, Gaetano, Sanchez-Lucas, Patricia, Sarkar, Biswaijt, Scarso, Carlos, Scherini, Viviana, Sciutto, Sergio, Segreto, Alberto, Sigl, Guenter, Stanca, Denis, Stasielak, Jaroslaw, Szadkowski, Zbigniew, Tapia, Alex, Tonachini, Aurelio, Guus van Aar, Sjoert van Velzen, Arjen van Vliet, Watson, Alan, Weidenhaupt, Klaus, Zhu, Yue, Zimmermann, Benedikt
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 24.11.2015
• Subjects: Augers; Cosmic rays; Flux; Observatories
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1503.07786

A measurement of the cosmic-ray spectrum for energies exceeding \(4{\times}10^{18}\) eV is presented, which is based on the analysis of showers with zenith angles greater than \(60^{\circ}\) detected with the Pierre Auger Observatory between 1 January 2004 and 31 December 2013. The measured spectrum confirms a flux suppression at the highest energies. Above \(5.3{\times}10^{18}\) eV, the "ankle", the flux can be described by a power law \(E^{-\gamma}\) with index \(\gamma=2.70 \pm 0.02 \,\text{(stat)} \pm 0.1\,\text{(sys)}\) followed by a smooth suppression region. For the energy (\(E_\text{s}\)) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find \(E_\text{s}=(5.12\pm0.25\,\text{(stat)}^{+1.0}_{-1.2}\,\text{(sys)}){\times}10^{19}\) eV.