AMANDA-BIO Limit on UHE Muon-Neutrinos

摘要

Data taken in 1997 with the AMANDA-BIO detector is searched for muon-neutrinos with energies above 10~(16)eV.At these energies the earth is opaque to neutrinos and neutrino induced events are concentrated at the horizon.The background are large muon bundles from dowrigoing atmospheric air shower events.In this search no excess events above background has been observed and a preliminary 90 % C.L.upper limit to an assumed E~(-2) muon-neutrino flux at the detector of E~2 PHI(2.5 centre dot 10~(15) eV < E_v < 5.6 centre dot 10~(18) eV) = 7.2 centre dot 10~(-7) cm~(-2) s~(-1) sr~(-1) GeV has been set.This is currently the most restrictive experimental bound placed by any neutrino detector at these energies.