An upper limit to the photon fraction in cosmic rays above 1019eV from the Pierre Auger Observatory
J. Abraham(Pierre Auger Observatory), B.S. Atulugama(Pierre Auger Observatory), Pasquale Blasi(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso), F. Arqueros(Universidad Complutense de Madrid), M. Ave(University of Chicago), I. Allekotte(Pierre Auger Observatory), E. Armengaud(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), D. Badagnani(Pierre Auger Observatory), David Barnhill(Pierre Auger Observatory), F. Arneodo(Pierre Auger Observatory), Jaime Álvarez-Muñiz(Universidade de Santiago de Compostela), F. Blanco(Universidad Complutense de Madrid), Henrique M. J. Barbosa(University of Maryland, Baltimore County), P. Bauleo(Pierre Auger Observatory), C. Aramo(Pierre Auger Observatory), S. BenZvi(University of Rochester), H. Asorey(Pierre Auger Observatory), Pedram Boghrat(Universidade Federal Fluminense), X. Bertou(Bariloche Atomic Centre), Peter L. Biermann(University of Alabama), C. Aguirre(Pierre Auger Observatory), K. Arisaka(Pierre Auger Observatory), J. J. Beatty(The Ohio State University), T. Beau(Pierre Auger Observatory), M. Aglietta(Osservatorio Astrofisico di Torino), P. Bernardini(University of Salento), S. L. C. Barroso(Pierre Auger Observatory), Jose A. Bellido(Pierre Auger Observatory), C. Bleve(Pierre Auger Observatory), T. Asch(Pierre Auger Observatory), J. C. dos Anjos(University of L'Aquila), D. Allard(Centre National de la Recherche Scientifique), C. Bérat(Pierre Auger Observatory), M. Ambrosio(Pierre Auger Observatory), P. Allison(Pierre Auger Observatory), A.F. Barbosa(Pierre Auger Observatory), K. Becker(University of Wuppertal), C. Álvarez(Universitat Jaume I), Luis A. Anchordoqui(Pierre Auger Observatory), T. Bäcker(Pierre Auger Observatory), B. R. Becker(Pierre Auger Observatory), G. Ávila(Pierre Auger Observatory), P. Billoir(Pierre Auger Observatory), J. Aublin(Centre National de la Recherche Scientifique), J. Bacelar(Universidad Michoacana de San Nicolás de Hidalgo), M. Barkhausen(Netherlands Institute for Radio Astronomy), H. Blümer(Pierre Auger Observatory)
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