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https://hdl.handle.net/2440/57963
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Type: | Journal article |
Title: | Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory |
Author: | Abraham, J. Abreu, P. Aglietta, M. Aguirre, I. Ahn, E. Allard, D. Allekotte, I. Allen, J. Allison, P. Alvarez-Muniz, J. Ambrosio, M. Anchordoqui, L. Andringa, S. Anzalone, A. Aramo, C. Argiro, S. Arisaka, K. Arneodo, F. Arqueros, F. Asch, T. et al. |
Citation: | Astroparticle Physics, 2009; 31(6):399-406 |
Publisher: | Elsevier Science BV |
Issue Date: | 2009 |
ISSN: | 0927-6505 1873-2852 |
Statement of Responsibility: | The Pierre Auger Collaboration |
Abstract: | From direct observations of the longitudinal development of ultra-high energy air showers performed with the Pierre Auger Observatory, upper limits of 3.8%, 2.4%, 3.5% and 11.7% (at 95% c.l.) are obtained on the fraction of cosmic-ray photons above 2, 3, 5 and 10 EeV (1 EeV = 10^18 eV) respectively. These are the first experimental limits on ultra-high energy photons at energies below 10 EeV. The results complement previous constraints on top-down models from array data and they reduce systematic uncertainties in the interpretation of shower data in terms of primary flux, nuclear composition and proton-air cross-section. |
Rights: | Copyright (c) Elsevier Science BV. Submitted to Cornell University’s online archive www.arXiv.org in 2009 by Viviana Scherini.Post-print sourced from www.arxiv.org. |
DOI: | 10.1016/j.astropartphys.2009.04.003 |
Grant ID: | ARC |
Published version: | http://arxiv.org/abs/0903.1127 |
Appears in Collections: | Aurora harvest 5 Physics publications |
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