Optical models in the resolved resonance region

Using modern time-of-flight facilities the resolved resonance region can be extended upward to about 1 MeV for nuclei with A<60 and for heavier nuclei near closed shells. A careful measurement both on and off resonances followed by a R-matrix analysis yields partial wave scattering functions which are easily energy averaged for comparison to those from an optical model. A comparison of average scattering functions of opposite parities can provide information on surface effects because the wave functions for different parities are out of phase at the surface. Thus, a unique supplement is made to the information that can be obtained from other types of measurements for both the bound region and higher energies