Authors

P. Abreu, LIP - Lisboa
M. Aglietta, Università degli Studi di Torino
E. J. Ahn, Fermi National Accelerator Laboratory
I. F.M. Albuquerque, Universidade de São Paulo
D. Allard, APC - AstroParticule et Cosmologie
I. Allekotte, Instituto Balseiro
J. Allen, New York University
P. Allison, The Ohio State University
A. Almeda, Universidad Tecnologica Nacional
J. Alvarez Castillo, Universidad Nacional Autónoma de México
J. Alvarez-Muñiz, Universidad de Santiago de Compostela
M. Ambrosio, Università degli Studi di Napoli Federico II
A. Aminaei, Radboud Universiteit
L. Anchordoqui, University of Wisconsin-Milwaukee
S. Andringa, LIP - Lisboa
T. Antičić, Institute Ruder Boskovic
C. Aramo, Università degli Studi di Napoli Federico II
E. Arganda, Universidad Nacional de La Plata
F. Arqueros, Universidad Complutense de Madrid
H. Asorey, Instituto Balseiro
P. Assis, LIP - Lisboa
J. Aublin, Laboratoire de Physique Nucléaire et de Hautes Energies
M. Ave, Karlsruher Institut für Technologie, Campus Süd
M. Avenier, Laboratoire de Physique Subatomique et de Cosmologie de Grenoble
G. Avila, Pierre Auger Observatory
T. Bäcker, Universität Siegen
M. Balzer, Karlsruher Institut für Technologie, Campus Nord
K. B. Barber, The University of Adelaide
A. F. Barbosa, Centro Brasileiro de Pesquisas Físicas
R. Bardenet, Laboratoire de l'Accélérateur Linéaire
S. L.C. Barroso, Universidade Estadual do Sudoeste da Bahia
B. Baughman, The Ohio State University
J. Bäuml, Karlsruher Institut für Technologie, Campus Nord

Document Type

Article

Publication Date

8-10-2012

Abstract

We report a measurement of the proton-air cross section for particle production at the center-of-mass energy per nucleon of 57 TeV. This is derived from the distribution of the depths of shower maxima observed with the Pierre Auger Observatory: systematic uncertainties are studied in detail. Analyzing the tail of the distribution of the shower maxima, a proton-air cross section of [505±22(stat)-36+28(syst)]mb is found. © 2012 American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

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