Fusion and elastic scattering cross sections were measured for ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ bombardments of ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ from 44 to 70 MeV. The evaporation residues from the compound nucleus decay were detected by a gas counter telescope. The fusion data were compared to results for ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ within the framework of the proximity, the Siwek-Wilczynska and Wilczynski, and the folding model potentials. Although the ratio $\frac{{\sigma }_{\mathrm{fus}}}{{\sigma }_R}$ is appreciably lower for ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ than for ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, consistent results were obtained for ${\sigma }_{\mathrm{fus}}$ within the experimental uncertainties.

NUCLEAR REACTIONS ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ + ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, $E=44.1\mathrm{} \mathrm{to} 70.4$ MeV; Measured evaporation residue $\sigma (E,\theta )$. Deduced $\sigma \mathrm{}\left(E\right)\mathrm{}$ total fusion excitation functions. Measured elastic scattering $\sigma \left(\theta \right)$. Natural target. Deduced ion-ion potentials.

• Received 5 March 1979

DOI:https://doi.org/10.1103/PhysRevC.20.969