PROSPECTS FOR RADIOWAVE AND ACOUSTIC DETECTION OF ULTRA-ENERGY AND SUPERHIGH-ENERGY COSMIC NEUTRINOS (CROSS-SECTIONS, SIGNALS, THRESHOLDS)

In the framework of the standard model the neutrino-nucleon cross sect ion is calculated for the energy range 10(2)-10(12) GeV. At neutrino e nergy 10(6) GeV the new result is 50% above the previous results. The amplitude of the acoustic signal caused by the electron-hadron cascade induced by neutrinos interacting with electrons and nucleons in water is recalculated in terms of the quark-gluon string model at energies 10(6)-10(8) GeV. This amplitude is about twice as large as previous es timates. It is shown that a 1-km(2) radio-wave neutrino detector (RAMA ND) established in Central Antarctica (at the South Pole or Vostok Sta tion) should be sensitive to the predicted diffuse fluxes of AGN neutr inos at energies above 100 TeV. Another planned cubic-kilometer-scale (KM3) neutrino telescope-the deep underwater neutrino detector SADCO i n the Mediterranean Sea-could search for cosmic neutrinos of energies higher than 10(7)-10(8) GeV. (C) 1998 American Institute of Physics.