Elastic scattering ofO16by even mass nickel isotopes

The angular distributions of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ elastically scattered from enriched targets of even-mass nickel isotopes have been measured for $E_{{}_{}{}^{16}{}_{}{}^{}\mathrm{O}}=36\mathrm{} \mathrm{to} 56$ MeV. A four parameter optical model is used to describe the data and the parameter ambiguities are discussed in detail. A potential folding calculation provides an equally good representation of the data and yields a set of equivalent optical model parameters which are within the parameter ambiguity relationships discussed. The ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + nucleon real potential necessary to describe the data through the folding procedure is less than one-half the value derived from ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + nucleon scattering measurements.