The elastic scattering of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ from ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ has been measured in the c.m. energy range 13-33 MeV. The measurements include angular distributions at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=21.1,23.7,26.4\mathrm{}$, and 29.0 MeV and excitation functions at ${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}=50,60,70,80,90\mathrm{}$, and 100°. Data have been analyzed with the conventional optical model with the aid of both strongly and weakly absorbing potentials as well as an absorptive potential obtained from the matter distribution of the colliding ions. The principal result is that the potential must be transparent (weakly absorbing) for surface partial waves. The detailed behavior for the low-$l$ partial waves is not well defined.

• Received 20 January 1972

DOI:https://doi.org/10.1103/PhysRevC.5.1839