Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
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...
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Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_09276505_v31_n6_p399_Multitudinario |
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todo:paper_09276505_v31_n6_p399_Multitudinario2023-10-03T15:46:57Z Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory Multitudinario:460 Augers Cosmology Observatories Photons Air showers Direct observations Photon fraction Pierre Auger observatory Systematic uncertainties Top down models Ultra-high energies Upper limits Cosmic rays 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. © 2009 Elsevier B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09276505_v31_n6_p399_Multitudinario |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Augers Cosmology Observatories Photons Air showers Direct observations Photon fraction Pierre Auger observatory Systematic uncertainties Top down models Ultra-high energies Upper limits Cosmic rays |
spellingShingle |
Augers Cosmology Observatories Photons Air showers Direct observations Photon fraction Pierre Auger observatory Systematic uncertainties Top down models Ultra-high energies Upper limits Cosmic rays Multitudinario:460 Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory |
topic_facet |
Augers Cosmology Observatories Photons Air showers Direct observations Photon fraction Pierre Auger observatory Systematic uncertainties Top down models Ultra-high energies Upper limits Cosmic rays |
description |
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. © 2009 Elsevier B.V. All rights reserved. |
format |
JOUR |
author |
Multitudinario:460 |
author_facet |
Multitudinario:460 |
author_sort |
Multitudinario:460 |
title |
Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory |
title_short |
Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory |
title_full |
Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory |
title_fullStr |
Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory |
title_full_unstemmed |
Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory |
title_sort |
upper limit on the cosmic-ray photon fraction at eev energies from the pierre auger observatory |
url |
http://hdl.handle.net/20.500.12110/paper_09276505_v31_n6_p399_Multitudinario |
work_keys_str_mv |
AT multitudinario460 upperlimitonthecosmicrayphotonfractionateevenergiesfromthepierreaugerobservatory |
_version_ |
1807323539452198912 |