Study of 3He + Nucleus Scattering with a Simplified Resonating-Group Method

 A simplified resonating-group method, called model K, is used to analyze ³He + nucleus scattering data for target nuclei with nucleon number ranging from 40 to 208 and for ³He energies ranging from 70 to 130 MeV. The results show that a rather satisfactory agreement between calculated and experimental differential-scattering cross sections can be obtained if one allows the value of the exchange-mixture parameter in the nucleon-nucleon potential to deviate somewhat from that in the corresponding N + nucleus case. With the model-K nonlocal interaction, an equivalent local internuclear potential is also constructed with a WKB procedure. Here it is found that, with a proper consideration of nucleon-exchange effects, one can explain nearly all of the energy dependence of the real part of the phenomenologically determined optical potential in ³He + nucleus scattering. Received May 31, 1999; revised November 9, 1999; accepted for publication December 20, 1999