%0 Journal Article
%A Arganda, E.
%A Arqueros Martínez, Fernando
%A Blanco Ramos, Francisco
%A García Pinto, Diego
%A Minaya Flores, Ignacio Andrés
%A Ortiz Ramis, Montserrat
%A Rosado Vélez, Jaime
%A Vázquez Peñas, José Ramón
%T 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
%D 2012
%@ 2041-8205
%U https://hdl.handle.net/20.500.14352/44729
%X The surface detector array of the Pierre Auger Observatory can detect neutrinos with energy E_ν between 10^17 eV and 10^20 eV from point-like sources across the sky south of +55 degrees and north of -65 degrees 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 . E_nu^-2. from a point-like source, 90% confidence level upper limits for k_PS at the level of ≈5x10^-7 and 2.5x10^-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.
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