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

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arxiv 1503.07786 v2 pith:W7FXEGLX submitted 2015-03-26 astro-ph.HE hep-ex

The Pierre Auger Collaboration: Alexander Aab , Pedro Abreu , Marco Aglietta , Eun-Joo Ahn , Imen Al Samarai , Ivone Albuquerque , Ingomar Allekotte , Patrick Allison
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Alejandro Almela Jesus Alvarez Castillo Jaime Alvarez-Muñiz Rafael Alves Batista Michelangelo Ambrosio Amin Aminaei Luis Anchordoqui Sofia Andringa Carla Aramo Victor Manuel Aranda Fernando Arqueros Nicusor Arsene Hernán Gonzalo Asorey Pedro Assis Julien Aublin Maximo Ave Michel Avenier Gualberto Avila Nafiun Awal Alina Mihaela Badescu Kerri B Barber Julia Bäuml Colin Baus Jim Beatty Karl Heinz Becker Jose A Bellido Corinne Berat Mario Edoardo Bertaina Xavier Bertou Peter Biermann Pierre Billoir Simon G Blaess Alberto Blanco Miguel Blanco Carla Bleve Hans Blümer Martina Boháčová Denise Boncioli Carla Bonifazi Nataliia Borodai Jeffrey Brack Iliana Brancus Ariel Bridgeman Pedro Brogueira William C Brown Peter Buchholz Antonio Bueno Stijn Buitink Mario Buscemi Karen S Caballero-Mora Barbara Caccianiga Lorenzo Caccianiga Marina Candusso Laurentiu Caramete Rossella Caruso Antonella Castellina Gabriella Cataldi Lorenzo Cazon Rosanna Cester Alan G Chavez Andrea Chiavassa Jose Augusto Chinellato Jiri Chudoba Marco Cilmo Roger W Clay Giuseppe Cocciolo Roberta Colalillo Alan Coleman Laura Collica Maria Rita Coluccia Ruben Conceição Fernando Contreras Mathew J Cooper Alain Cordier Stephane Coutu Corbin Covault James Cronin Richard Dallier Bruno Daniel Sergio Dasso Kai Daumiller Bruce R Dawson Rogerio M de Almeida Sijbrand J de Jong Giuseppe De Mauro Joao de Mello Neto Ivan De Mitri Jaime de Oliveira Vitor de Souza Luis del Peral Olivier Deligny Hans Dembinski Niraj Dhital Claudio Di Giulio Armando Di Matteo Johana Chirinos Diaz Mary Lucia Díaz Castro Francisco Diogo Carola Dobrigkeit Wendy Docters Juan Carlos D'Olivo Alexei Dorofeev Qader Dorosti Hasankiadeh Maria Teresa Dova Jan Ebr Ralph Engel Martin Erdmann Mona Erfani Carlos O Escobar Joao Espadanal Alberto Etchegoyen Heino Falcke Ke Fang Glennys Farrar Anderson Fauth Norberto Fazzini Andrew P Ferguson Mateus Fernandes Brian Fick Juan Manuel Figueira Alberto Filevich Andrej Filipčič Brendan Fox Octavian Fratu Martín Miguel Freire Benjamin Fuchs Toshihiro Fujii Beatriz García Diego Garcia-Pinto Florian Gate Hartmut Gemmeke Alexandru Gherghel-Lascu Piera Luisa Ghia Ugo Giaccari Marco Giammarchi Maria Giller Dariusz G{l}as Christian Glaser Henry Glass Geraldina Golup Mariano Gómez Berisso Primo F Gómez Vitale Nicolás González Ben Gookin Jacob Gordon Alessio Gorgi Peter Gorham Philippe Gouffon Nathan Griffith Aurelio Grillo Trent D Grubb Fausto Guarino Germano Guedes Matías Rolf Hampel Patricia Hansen Diego Harari Thomas A Harrison Sebastian Hartmann John Harton Andreas Haungs Thomas Hebbeker Dieter Heck Philipp Heimann Alexander E Herve Gary C Hill Carlos Hojvat Nicholas Hollon Ewa Holt Piotr Homola Jörg Hörandel Pavel Horvath Miroslav Hrabovský Daniel Huber Tim Huege Antonio Insolia Paula Gina Isar Ingolf Jandt Stefan Jansen Cecilia Jarne Jeffrey A Johnsen Mariela Josebachuili Alex Kääpä Olga Kambeitz Karl Heinz Kampert Peter Kasper Igor Katkov Balazs Kégl Bianca Keilhauer Azadeh Keivani Ernesto Kemp Roger Kieckhafer Hans Klages Matthias Kleifges Jonny Kleinfeller Raphael Krause Nicole Krohm Oliver Krömer Daniel Kuempel Norbert Kunka Danielle LaHurd Luca Latronico Robert Lauer Markus Lauscher Pascal Lautridou Sandra Le Coz Didier Lebrun Paul Lebrun Marcelo Augusto Leigui de Oliveira Antoine Letessier-Selvon Isabelle Lhenry-Yvon Katrin Link Luis Lopes Rebeca López Aida López Casado Karim Louedec Lu Lu Agustin Lucero Max Malacari Simone Maldera Manuela Mallamaci Jennifer Maller Dusan Mandat Paul Mantsch Analisa Mariazzi Vincent Marin Ioana Mariş Giovanni Marsella Daniele Martello Lilian Martin Humberto Martinez Oscar Martínez Bravo Diane Martraire Jimmy Masías Meza Hermann-Josef Mathes Sebastian Mathys James Matthews John Matthews Giorgio Matthiae Detlef Maurel Daniela Maurizio Eric Mayotte Peter Mazur Carlos Medina Gustavo Medina-Tanco Rebecca Meissner Victor Mello Diego Melo Alexander Menshikov Stefano Messina Rishi Meyhandan Maria Isabel Micheletti Lukas Middendorf 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keywords texttimesfluxspectrumsuppressionaboveaugerdetected
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abstract

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.

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  1. Measurement of the cosmic-ray energy spectrum above 2.5 EeV using 19 years of operation of the Pierre Auger Observatory

    astro-ph.HE 2025-07 accept novelty 4.0 of 10

    After 19 years of data, the combined Auger spectrum confirms the instep feature in the ultra-high-energy cosmic-ray flux at 5.5-sigma significance.

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