Abstract
Multipole strength distributions for isoscalar $L\ensuremath{\le}2$ transitions in $^{28}\mathrm{Si}$ have been extracted using 386-MeV inelastic $\ensuremath{\alpha}$ scattering at extremely forward angles, including ${0}^{\ensuremath{\circ}}$. Observed strength distributions are in good agreement with microscopic calculations for an oblate-deformed ground state. In particular, a large peak at an excitation energy of 17.7 MeV in the isoscalar giant monopole resonance strength is consistent with the calculations.
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