Elastic scattering angular distributions have been measured for the systems ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ + ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ at $E_L=33.7, 41.6, \mathrm{and} 49.5$ MeV and ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ + ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ at $E_L=41.6\mathrm{} \mathrm{and} 49.5$ MeV. The ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ and ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ data are oscillatory and similar for angles less than 50° c.m. For angles greater than 50° c.m., the oscillations in the ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ data are damped and the data stop decreasing with increasing angle. Elastic scattering angular distributions have been calculated for ${}_{}{}^{10,11}{}_{}{}^{}\mathrm{B}$ + ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ with the coupling to the ground-state quadrupole moment included explicitly. Potentials which describe the scattering are extracted with the double folding model. It is found that the quadrupole coupling is necessary to explain the difference in ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ and ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ scattering from ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$.

NUCLEAR REACTIONS ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ (${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$, ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$) ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, $E_L=33.7, 41.6, \mathrm{and} 49.5$ MeV, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ (${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$, ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$) ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, $E_L=41.6\mathrm{} \mathrm{and} 49.5$ MeV. Measured $\sigma \left(\theta \right)$, deduced Woods-Saxon, and double-folding model parameters. Coupled channels calculations for the ground-state quadrupole moment contributions.

• Received 31 July 1979

DOI:https://doi.org/10.1103/PhysRevC.21.217