An upper limit to the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatory

dc.creatorAbraham, J.
dc.creatorAglietta, M.
dc.creatorAguirre, C.
dc.creatorAllard, D.
dc.creatorPepe, Iuri Muniz
dc.creatorAbraham, J.
dc.creatorAglietta, M.
dc.creatorAguirre, C.
dc.creatorAllard, D.
dc.creatorPepe, Iuri Muniz
dc.date.accessioned2022-10-07T19:13:09Z
dc.date.available2022-10-07T19:13:09Z
dc.date.issued2007
dc.identifier0927-6505
dc.identifierhttp://repositorio.ufba.br/ri/handle/ri/15910
dc.identifierv. 27, n. 2-3
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/4013162
dc.description.abstractAn upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 1019 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.
dc.languageen
dc.rightsAcesso Aberto
dc.sourcehttp://dx.doi.org/10.1016/j.astropartphys.2006.10.004
dc.subjectCosmic rays
dc.subjectUltra-high energy photons
dc.subjectExtensive air showers
dc.subjectPierre Auger Observatory
dc.titleAn upper limit to the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatory
dc.typeArtigo de Periódico


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