Strangeness Modes in Nuclei Tested by Anti-Neutrinos

Production of negative strangeness in reactions of inelastic anti-neutrino scattering on a nucleus provides information on the modi cation of strange degrees of freedom in nuclear matter. We calculate cross-sections of the reaction channels e( ) ! e ( ) +K and e( ) + p! + e ( ) and investigate their sensitivity to the medium e ects. In particular, we consider e ects induced by the presence of a low-energy excitation mode in the K spectrum, associated with the correlated -particle and proton-hole states, and the renormalization of the weak interaction in medium. In order to avoid double counting, various contributions to anti-neutrino scattering are classi ed with the help of the optical theorem, formulated within the non-equilibrium Green's function technique. PACS: 25.30.Pt, 21.65.+f, 14.40.Aq e-mail: [email protected] e-mail: [email protected]