Study of He-3 plus nucleus scattering with a simplified resonating-group method

A simplified resonating-group method, called model K, is used to analyze He -3 + nucleus scattering data for target nuclei with nucleon number ranging from 40 to 208 and for He-3 energies ranging from 70 to 130 MeV. The result s show that a rather satisfactory agreement between calculated and experime ntal differential-scattering cross sections can be obtained if one allows t he 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 potentia l is also constructed with a WKB procedure. Here it is found that, with a p roper consideration of nucleon-exchange effects, one can explain nearly all of the energy dependence of the real part of the phenomenologically determ ined optical potential in He-3 + nucleus scattering.