Abstract

A search has been conducted for ultra high energy (UHE) neutrinos (energy greater than 106 GeV) using data collected during the year 2000 by the AMANDA‐II detector. Due to absorption of UHE neutrinos in the earth, the UHE signal is concentrated at the horizon and has to be separated from the background of large muon‐bundles induced by cosmic ray air showers. This preliminary analysis leads to a limit for an E−2 all neutrino spectrum (assuming a 1:1:1 flavor ratio) of 9.9 × 10−7 cm−2s−1 sr−1 GeV for an energy range between 1.8 × 105 GeV and 1.8 × 109 GeV, including systematic uncertainties.

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