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Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
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Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
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| dc.contributor.author | The Pierre Auger Collaboration | |
| dc.contributor.author | Pastor Carpi, Sergio | |
| dc.contributor.author | Pinto, Teguayco | |
| dc.date.accessioned | 2015-11-03T13:27:17Z | |
| dc.date.available | 2015-11-03T13:27:17Z | |
| dc.date.issued | 2009 | |
| dc.identifier.citation | The Pierre Auger Collaboration Pastor Carpi, Sergio Pinto, Teguayco 2009 Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory Astroparticle Physics 31 6 399 406 | |
| dc.identifier.uri | http://hdl.handle.net/10550/48022 | |
| dc.description.abstract | 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. | |
| dc.language.iso | eng | |
| dc.relation.ispartof | Astroparticle Physics, 2009, vol. 31, num. 6, p. 399-406 | |
| dc.subject | Física | |
| dc.title | Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory | |
| dc.type | journal article | es_ES |
| dc.date.updated | 2015-11-03T13:27:17Z | |
| dc.identifier.doi | 10.1016/j.astropartphys.2009.04.003 | |
| dc.identifier.idgrec | 060096 | |
| dc.rights.accessRights | open access | es_ES |
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