An upper limit to the photon fraction in cosmic rays above 10<sup>19</sup> 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<sup>19</sup> 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 ph...

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Detalles Bibliográficos
Autores principales: Badagnani, Daniel Omar, Dova, María Teresa, Epele, Luis Nicolás, Gómez Albarracín, Flavia Alejandra, Grunfeld, Christian Martín, Manceñido, Mónica E., Sciutto, Sergio Juan, Tueros, Matías Jorge, Veiga, Alejandro Luis, Wahlberg, Hernán Pablo, The Pierre Auger Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Ciencias Exactas
Física
Radiación cósmica
Fotones
Cascada atmosférica extensa
Pierre Auger Observatory
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/80562
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10<sup>19</sup> 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.

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