ROLE OF NUCLEAR-STRUCTURE IN THE SPIN-ISOSPIN NUCLEAR RESPONSE PROBLEM

The origin of the large discrepancy existing between calculated values of the spin-isospin response functions and those observed by proton s cattering experiments is investigated. We conclude from the results of several Hartree-Fock based random phase approximation calculations th at nuclear structure effects play ah important role in lowering the ra tio of spin-longitudinal to spin-transverse response functions R(L)/R( T), in agreement with experiment. We find that the effective mass has a predominant influence in reducing R(L)/R(T).