Electroexcitation of giant multipole resonances in /sup 24/Mg
Highly excited multipole resonances of /sup 24/Mg between 9 and 34 MeV excitation energy have been investigated by inelastic electron scattering for incident energies in the 102 and 200 MeV range. Prominent giant dipole resonances were observed at 18.9 and 20 MeV excitation energy, with a shape which is very similar to the shape of the photoneutron cross section. Over twenty-five quadrupole and twenty octupole resonances were identified and separated by means of the multipole expansion method. The giant dipole strength exhausts (85/sup +9//sub -/17)% of the isovector dipole energy-weighted sum rule. The quadrupole and the octupole strength exhaust (117more »