OPTICAL-MODEL ANALYSIS WITH SPIN-ORBIT POTENTIAL FOR 30-MEV AND 35-MEV 3HE ELASTIC SCATTERING

Measured differential cross sections are reported for 30-MeV He3 ions elastically scattered from Al27, V51, Co59, Ni60, Y89, Cd114, In115, and Sn116 for angles between 6°and 165°and for 35-MeV He3 ions elastically scattered from Co59, Ni60, In115, and Sn116 for angles between 6°and 140°. The data are compared with predictions of the nuclear optical model, and potential parameters that produce optimum fits with a least-squares computer routine are reported. Good fits at back angles for Al27, V51, Co59, and Ni60 are obtained only with the inclusion of a spin-orbit interaction with a magnitude between 2 and 5 MeV for most cases. The back-angle data for these nuclei also tend to suppress discrete ambiguities in the potential well depths. A continuous ambiguity between the radius and the diffuseness parameters is found to be related to a constancy of the root-mean-square radius. Effects of experimental uncertainties on the potential parameters are also presented. © 1969 The American Physical Society.