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° 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 × E^ –2 ν from a point-like source, 90% confidence level upper limits for k 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.

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

DE MITRI, IVAN
2012-01-01

Abstract

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° 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 × E^ –2 ν from a point-like source, 90% confidence level upper limits for k 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.
Astroparticle physics; cosmic rays; neutrinos; telescopes
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12571/1307
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