Abstract
The electric giant dipole resonance of 24−26Mg has been explored up to 30 MeV excitation energy with bremsstrahlung. ΔE, E spectra of charged photo-particles and spectra of prompt deexcitation γ-rays from excited residual nuclear states were obtained at various bremsstrahlung endpoint energies. The 25Mg(γ, p 0), (γ, d), 24,25Mg(γ, α) differential cross sections as well as 24−26 Mg( γ, xγ′) integrated cross sections are presented. The results are discussed in terms of one-particle, one-hole excitations and isospin composition of giant resonance states. A comparison with calculations for 24Mg gives poor agreement. Excitations from deeper shells were found in the giant dipole resonance of 24Mg, but do not seem to be concentrated at higher energies. In 25Mg, only weak excitations of this kind were found, and they are completely absent in 26Mg.
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