Magnetic Transitions inSi28Excited by 180° Electron Scattering

States in ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ have been excited by 180° electron scattering at bombarding energies of 39 and 56 MeV. Three strong $M1\mathrm{}$ transitions excited levels at 10.86, 11.41, and 12.27 MeV with ground-state radiation widths of 5.7, 20.8, and 7.3 eV, respectively. Three weaker transitions, probably $M1\mathrm{}$, are also treated. The apparent excitation of $M2\mathrm{}$ transitions which may possibly be identified with theoretically predicted $2^{-}$ spin-isospin giant resonances is discussed. The relation of these results to the theory of Kurath as well as to nuclear-model assumptions is also discussed.