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metadata.dc.type: | Artigo de Periódico |
Title: | Search for point-like sources of ultra-high energy neutrinos at the Pierre auger observatory and improved limit on the diffuse flux of tau neutrinos |
Other Titles: | Astrophysical Journal Letters |
Authors: | Abreu, P. Aglietta, M. Ahlers, M. Ahn, E. J. Albuquerque, Ivone Freire da Mota e Allard, D. Allekotte, I. Allen, J. Allison, P. Pepe, Iuri Muniz |
metadata.dc.creator: | Abreu, P. Aglietta, M. Ahlers, M. Ahn, E. J. Albuquerque, Ivone Freire da Mota e Allard, D. Allekotte, I. Allen, J. Allison, P. Pepe, Iuri Muniz |
Abstract: | The surface detector array of the Pierre Auger Observatory can detect neutrinos with energy E ν between 1017 eV and 1020 eV from point-like sources across the sky south of +55° and north of –65° declinations. A search has been performed for highly inclined extensive air showers produced by the interaction of neutrinos of all flavors in the atmosphere (downward-going neutrinos), and by the decay of tau leptons originating from tau neutrino interactions in Earth's crust (Earth-skimming neutrinos). No candidate neutrinos have been found in data up to 2010 May 31. This corresponds to an equivalent exposure of ~3.5 years of a full surface detector array for the Earth-skimming channel and ~2 years for the downward-going channel. An improved upper limit on the diffuse flux of tau neutrinos has been derived. Upper limits on the neutrino flux from point-like sources have been derived as a function of the source declination. Assuming a differential neutrino flux k PS centerdot E –2 ν from a point-like source, 90% confidence level upper limits for k PS at the level of ≈5 × 10–7 and 2.5 × 10–6 GeV cm–2 s–1 have been obtained over a broad range of declinations from the searches for Earth-skimming and downward-going neutrinos, respectively. |
Keywords: | Astroparticle physics Cosmic rays Neutrinos Telescopes |
metadata.dc.publisher.country: | Brasil |
metadata.dc.rights: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/15305 |
Issue Date: | 2012 |
Appears in Collections: | Artigo Publicado em Periódico (Química) |
Files in This Item:
File | Description | Size | Format | |
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P. Abreu.pdf | 413,5 kB | Adobe PDF | View/Open |
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