Inelastic Electron Scattering fromMg24at 180°

The 180° inelastic electron scattering from ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ has been studied at bombarding energies of 39 and 56 MeV. A survey was made of the giant-resonance region from 14 to 28 MeV. The excitation region from 9 to 14 MeV was treated more intensively in order to study the analogs of states in ${}_{}{}^{24}{}_{}{}^{}\mathrm{Na}$. Measurement of the transition radius $R$ and the ground-state transition-width $\Gamma$ for the 9.94- and 10.70-MeV levels yielded $R=3.5\mathrm{}\pm 0.2$ F, $\Gamma =11.9\mathrm{}\pm 2.7$ eV and $R=3.0\mathrm{}\pm 0.2$ F, $\Gamma =18.9\mathrm{}\pm 3.7$ eV, respectively. The relation of these results to Kurath's theory is discussed.