New Limits on the Ultra-high Energy Cosmic Neutrino Flux from the ANITA Experiment

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We report initial results of the first flight of the Antarctic Impulsive Transient Antenna (ANITA-1) 2006-2007 Long Duration Balloon flight, which searched for evidence of a diffuse flux of cosmic neutrinos above energies of 3 EeV.

• ANITA-1 flew for 35 days looking for radio impulses due to the Askaryan effect in neutrino-induced electromagnetic showers within the Antarctic ice sheets.
• We report here on our initial analysis, which was performed as a blind search of the data.
• No neutrino candidates are seen, with no detected physics background.