NUCLEON-SCATTERING TO THE CONTINUUM IN TERMS OF THE 2-FERMION THEORY OF MULTISTEP DIRECT REACTIONS

Cross sections of the (p,xp) reaction on Nb-93 were measured at an inc ident energy of 26.5 MeV and analysed together with the existing data for nucleon scattering between 18 and 26 MeV. The (p,p') and (n,n') em ission spectra and angular distributions have been described consisten tly in the framework of the two-fermion multistep direct theory of Fes hbach, Kerman and Koonin, We have confirmed the predictions following our earlier analyses that the strength of the effective nucleon-nucleo n interaction does not depend on the reaction channel provided that al l pre-equilibrium reactions are included. The latter requires allowing for the giant resonances in continuum from the energy-weighted sum ru les. The method applied avoids double-counting of collective and onest ep direct excitations. (C) 1998 Elsevier Science B.V.