Abstract
Ultra high-energy (UHE) neutrinos (E>1015 eV) is expected to exist due to presence of the cosmic microwave background and UHE cosmic rays implied by Greisen, Zatsepin and Kuz'min (GZK). The low rate of GZK neutrinos requires us to utilize a large mass (50 Gton) of detection medium. Collision between the UHE neutrino and the rock salt produces electromagnetic shower, which includes a huge number of unpaired electrons in rock salt. They would emit sensible radio wave by coherent Cherenkov effect. Attenuation lengths of natural rock salt at 0.3 and 1.0 GHz were measured to know possibility of a salt neutrino detector. The result indicates a feasible plan with economical antenna spacing. Detection possibility of GZK neutrinos in natural huge rock salt formation has been simulated including attenuation length, background noise and bandwidth of antennae so that GZK neutrinos of 8-62 per year would be detected.
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