Abstract:
We report on a search for extremely-high energy neutrinos with energies greater than 10⁶ GeV using the data taken with the IceCube detector at the South Pole. The data was collected between April 2008 and May 2009 with the half-completed IceCube array. The absence of signal candidate events in the sample of 333.5 days of live time significantly improves model-independent limits from previous searches and allows to place a limit on the diffuse flux of cosmic neutrinos with an E⁻² spectrum in the energy range 2.0×10⁶−6.3×10⁹ GeV to a level of E²ϕ≤3.6×10⁻⁸ GeV cm⁻² sec⁻¹ sr⁻¹.
