Excitation functions for ${}_{}{}^{16}{}_{}{}^{})\mathrm{e}\mathrm{l}\mathrm{a}\mathrm{s}\mathrm{t}\mathrm{i}\mathrm{c}$ scattering were measured for ${}_{}{}^{24,26}{}_{}{}^{}\mathrm{Mg}$ and ${}_{}{}^{28,30}{}_{}{}^{}\mathrm{Si}$ at several angles in the energy range $20 \mathrm{MeV}\lesssim E_{\mathrm{c}.\mathrm{m}.\mathrm{}}\lesssim 35 \mathrm{MeV}$. Detailed angular distributions were obtained for ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ (${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$) at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=21\mathrm{} \mathrm{}\left(21.7\right), 24 \mathrm{}\left(24.8\right), 27 \mathrm{}\left(27.9\right), \mathrm{and} 30 \mathrm{}\left(31.0\right)\mathrm{}$ MeV. The data were analyzed with a conventional optical model with a shallow, and energy-dependent real, and a weakly absorbing and energy-dependent imaginary potential.

NUCLEAR REACTIONS ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$), ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$), ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$), ${}_{}{}^{30}{}_{}{}^{}\mathrm{Si}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$). Measured elastic scattering cross section $20 \mathrm{MeV}<~E_{\mathrm{c}.\mathrm{m}.\mathrm{}}<~35 \mathrm{MeV}$. Fitted optical models to data.

• Received 24 April 1979

DOI:https://doi.org/10.1103/PhysRevC.20.648