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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Publicado:	2009
Materias:	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
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09276505_v31_n6_p399_Multitudinario http://hdl.handle.net/20.500.12110/paper_09276505_v31_n6_p399_Multitudinario
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09276505_v31_n6_p399_Multitudinario
record_format	dspace
spelling	paper:paper_09276505_v31_n6_p399_Multitudinario2023-06-08T15:51:52Z Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory 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. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09276505_v31_n6_p399_Multitudinario 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 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.
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
publishDate	2009
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09276505_v31_n6_p399_Multitudinario http://hdl.handle.net/20.500.12110/paper_09276505_v31_n6_p399_Multitudinario
_version_	1768544510317428736

Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory

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