Free nucleon-nucleon t-matrix effective interaction for nucleon knockout.

Free nucleon-nucleon (N - N) t -matrix effective interaction has been evaluated using realistic N-N interaction, V N − N (r) with repulsive core potential for energies below the pion production threshold. For this relative motion wave functions are obtained by solving the Schrödinger equations incorporating the realistic interaction. The resultant t -matrix effective interaction is not only a function of the N - N separation, total spin and isospin of the interacting nucleons but is also found to be a strong function of L , the multipole moment. All the t L (r) 's are found to vanish at r = 0 , in contradiction to the commonly employed M3Y form. In this approach, with the change of energy, one does not have to search for new parameters to evaluate these t L (r) 's. Even though the V N − N (r) 's are real the t L (r) 's are intrinsically complex. These features are expected to make huge impact on the finite range predictions of the (p,2p), (p,pn) and (n,2n) reactions. [ABSTRACT FROM AUTHOR]