INELASTIC NU-SCATTERING AND (NU)OVER-BAR-SCATTERING ON NUCLEI AND STRANGENESS OF THE NUCLEON

Possibilities to extract information on the strange form factors of th e nucleon from neutrino (anti-neutrino) inelastic scattering on nuclei , in an energy range from 200 MeV to 1 GeV and more, are investigated in detail. All calculations are performed within two relativistic inde pendent particle models (Fermi gas and shell model); the final state i nteractions of the ejected nucleon are taken into account through rela tivistic optical model potentials. We have shown that the values of th e cross sections significantly depend on the nuclear model (especially in the lower energy range). However, the NC/CC neutrino-anti-neutrino asymmetry in a medium-high energy range shows a rather small dependen ce on the model and allows to disentangle different values of the para meters that characterize the strange form factors. We have calculated also the ratio of the cross sections for inelastic NC scattering of ne utrinos on nuclei, with the emission of a proton and of a neutron. Our calculations show that at high neutrino energy this ratio depends rat her weakly on the nuclear model and confirm previous conclusions on th e rather strong dependence of this ratio upon the axial strange form f actors; however at E-nu less than or equal to 200 MeV, the FSI are fou nd to significantly affect the ratio. (C) 1997 Elsevier Science B.V.