We have measured excitation functions for elastic and inelastic scattering of the nonsymmetric alpha-particle system of ${}_{}{}^{24}{}_{}{}^{}\mathrm{Si}$, in the energy range 90.95 MeV<$E_{\mathrm{lab}<106.25\mathrm{}}$ MeV. We observe narrow structures similar to those seen in the nearby ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ and ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ systems. Elastic scattering angular distributions reflect the contribution of two or three l values for structures at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}=50.51\mathrm{}}$ and 52.53 MeV, with the dominant partial waves in the range of l=33 to 38 ħ. A statistical fluctuation analysis of the data for the low lying excitations confirms the nonstatistical nature of these resonances.

• Received 16 April 1987

DOI:https://doi.org/10.1103/PhysRevC.36.1011