Inelastic scattering ofO18andO17ions from medium-weight nuclei

Inelastic scattering of ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ and ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ ions from various target nuclei in the mass range $A=48-92\mathrm{}$ has been investigated at incident energies between 54 and 69 MeV. Angular distributions for the excitation of the first excited states in the target nuclei are well reproduced by conventional distorted-wave Born approximation calculations with $B\left(E2\mathrm{}\right)\mathrm{}$ values from the literature, and equal charge and mass deformation lengths. The measured angular distributions for the excitation of the first excited state in ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ are, however, shifted to forward angles by 2°-5° (c.m.) with respect to the theoretical calculations. This shift is more pronounced for target nuclei near closed neutron shells. Furthermore, ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ and ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ induced one and two neutron transfer reactions on some of these nuclei have been measured. The systematics observed in our inelastic scattering and transfer studies suggest that two step processes including neutron transfer channels as intermediate steps are responsible for these observed shifts.