Proton and alpha decay from the giant resonance region of ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ excited with a 129 MeV alpha particle beam has been measured in coincidence with inelastic alpha particles detected at 0°. The angular correlation data show the presence of decay from both E0 and E2 giant resonances. The E0 giant resonance decays primarily through the ${\mathrm{\alpha }}_0$, ${\mathrm{\alpha }}_1$, ${\mathit{p}}_0$, and ${\mathit{p}}_{1,2}$ channels with the branching ratios 18±6 %, 24±8 %, 23±9 %, and 18±8 %, respectively. Substantial direct decay is observed.

• Received 11 December 1989

DOI:https://doi.org/10.1103/PhysRevC.41.1417