An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory

An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10 19 eV, based on observations of the depth of shower maximum performed with the hybrid detector of the Pierre Auger Observatory. This is the first such limit on photons obtained by obse...

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Autor principal: Abraham, J.
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Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09276505_v27_n2-3_p155_Abraham
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spelling todo:paper_09276505_v27_n2-3_p155_Abraham2023-10-03T15:46:55Z An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory Abraham, J. Cosmic rays Extensive air showers Pierre Auger Observatory Ultra-high energy photons Auger electron spectroscopy Fluorescence Photons Extensive air showers Pierre Auger Observatory Ultra high energy photons Cosmic rays An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10 19 eV, based on observations of the depth of shower maximum performed with the hybrid detector of the Pierre Auger Observatory. This is the first such limit on photons obtained by observing the fluorescence light profile of air showers. This upper limit confirms and improves on previous results from the Haverah Park and AGASA surface arrays. Additional data recorded with the Auger surface detectors for a subset of the event sample support the conclusion that a photon origin of the observed events is not favored. © 2006 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_v27_n2-3_p155_Abraham
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cosmic rays
Extensive air showers
Pierre Auger Observatory
Ultra-high energy photons
Auger electron spectroscopy
Fluorescence
Photons
Extensive air showers
Pierre Auger Observatory
Ultra high energy photons
Cosmic rays
spellingShingle Cosmic rays
Extensive air showers
Pierre Auger Observatory
Ultra-high energy photons
Auger electron spectroscopy
Fluorescence
Photons
Extensive air showers
Pierre Auger Observatory
Ultra high energy photons
Cosmic rays
Abraham, J.
An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory
topic_facet Cosmic rays
Extensive air showers
Pierre Auger Observatory
Ultra-high energy photons
Auger electron spectroscopy
Fluorescence
Photons
Extensive air showers
Pierre Auger Observatory
Ultra high energy photons
Cosmic rays
description An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10 19 eV, based on observations of the depth of shower maximum performed with the hybrid detector of the Pierre Auger Observatory. This is the first such limit on photons obtained by observing the fluorescence light profile of air showers. This upper limit confirms and improves on previous results from the Haverah Park and AGASA surface arrays. Additional data recorded with the Auger surface detectors for a subset of the event sample support the conclusion that a photon origin of the observed events is not favored. © 2006 Elsevier B.V. All rights reserved.
format JOUR
author Abraham, J.
author_facet Abraham, J.
author_sort Abraham, J.
title An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory
title_short An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory
title_full An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory
title_fullStr An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory
title_full_unstemmed An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory
title_sort upper limit to the photon fraction in cosmic rays above 10 19 ev from the pierre auger observatory
url http://hdl.handle.net/20.500.12110/paper_09276505_v27_n2-3_p155_Abraham
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