Аннотация
Due to the low flux of ultra-high energetic neutrinos induced in interactions
of cosmic rays with the cosmic microwave background, very large instrumented
volumes and new registration techniques are necessary for their detection.
The south polar ice offers the unique opportunity to implement existing
Cherenkov techniques as well as registration of radio and acoustic
waves from the neutrino interaction. A simulation of a ~ 120 km3
hybrid optical/radio/acoustic detector showed that event rates of
~ 10 per year can be achieved. In this simulation the ultrasonic
parameters of antarctic ice regarding absorption, scattering and
environmental noise pose the key uncertainty. To evaluate the acoustic
properties in-situ, the South Pole Acoustic Test Setup (SPATS) has
been created. An array of custom-made ultrasonic sensors and transmitters
will be deployed on three strings in the upper 400 m of the holes
of the IceCube experiment. The status of the experiment and a first
evaluation of its performance are presented here.
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