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Astrophysical neutrinos in the EeV range (particularly those generated by theinteraction of cosmic rays with the cosmic microwave background) promise to bea valuable tool to study astrophysics and particle physics at the highestenergies. Much could be learned from temporal, spectral, and angulardistributions of ~100 events, which could be collected by a detector with ~100km^3 effective volume in a few years. Scaling the optical Cherenkov techniqueto this scale is prohibitive. However, using the thick ice sheet available atthe South Pole, the radio and acoustic techniques promise to provide sufficientsensitivity with sparse instrumentation. The best strategy may be a hybridapproach combining all three techniques. A new array of acoustic transmittersand sensors, the South Pole Acoustic Test Setup, was installed in three IceCubeholes in January 2007. The purpose of SPATS is to measure the attenuationlength, background noise, and sound speed for 10-100 kHz acoustic waves.Favorable results would pave the way for a large hybrid array. SPATS is thefirst array to study the possibility of acoustic neutrino detection in ice, themedium expected to be best for the purpose. First results from SPATS arepresented.

Feasibility of acoustic neutrino detection in ice: First results from the South Pole Acoustic Test Setup (SPATS)