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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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 |
work_keys_str_mv |
AT abrahamj anupperlimittothephotonfractionincosmicraysabove1019evfromthepierreaugerobservatory AT abrahamj upperlimittothephotonfractionincosmicraysabove1019evfromthepierreaugerobservatory |
_version_ |
1807320399739879424 |