Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-12
Astropart.Phys.22:127-138,2004
Astronomy and Astrophysics
Astrophysics
18 pages, 12 figures
Scientific paper
10.1016/j.astropartphys.2004.06.
We report on a search for electro-magnetic and/or hadronic showers (cascades) induced by high energy neutrinos in the data collected with the AMANDA II detector during the year 2000. The observed event rates are consistent with the expectations for atmospheric neutrinos and muons. We place upper limits on a diffuse flux of extraterrestrial electron, tau and muon neutrinos. A flux of neutrinos with a spectrum $\Phi \propto E^{-2}$ which consists of an equal mix of all flavors, is limited to $E^2 \Phi(E)=8.6 x 10^{-7} GeV/(cm^{2} s sr)$ at a 90% confidence level for a neutrino energy range 50 TeV to 5 PeV. We present bounds for specific extraterrestrial neutrino flux predictions. Several of these models are ruled out.
Ackermann Marcelo
The AMANDA Collaboration
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