High-lying states of ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$, ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, and ${}_{}{}^{30}{}_{}{}^{}\mathrm{Si}$ produced in α scattering are compared with the spectra corresponding to the two dynamical symmetries of the U(4) model. The ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ system prefers the O(4) limit, while in the other cases, where the experimental spectra are less complete, there are no such preferences.

NUCLEAR REACTIONS ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{24,26}{}_{}{}^{}\mathrm{Mg}(\alpha , {\alpha }^{\prime })$ resonances, application of the algebraic model.

• Received 31 August 1982

DOI:https://doi.org/10.1103/PhysRevC.27.2991