LIMITS ON THE FLUX OF VERY-HIGH-ENERGY NEUTRINOS WITH THE FREJUS DETECTOR

The final data set of muons recorded with the Frejus detector has been analyzed to determine the atmospheric neutrino nu(mu)-flux. From the depth intensity relation of the muon flux a region of almost horizonta l neutrino induced muons has been identified. The measurement of the e nergy loss inside the detector of these through-going muons allows a s earch for deviations from the expected energy spectrum of the atmosphe ric neutrinos with two independent methods. No evidence of any extra n u(mu)-flux at energies > 1 TeV has been found thus enabling significan t limits to be set on the extragalactic nu(mu)-flux predicted by sever al models of cosmological sources. These limits do not depend on the p articular atmospheric neutrino flux model considered.