G. Feldman

Role of isospin in the statistical decay of the giant dipole resonance built on excited states

Abstract The statistical γ-decay of the giant dipole resonance built on excited states was investigated in several nuclei in the sd-shell region. The yield of high-energy γ-rays in self-conjugate nuclei populated by T = 0 entrance channels was found to be strongly inhibited compared to the yield from T ≠ 0 entrance channels and compared to that in nuclei with Z ≠ Z . This can be explained as due to good isospin purity in the compound nuclear states at high excitation energy.

Systematic behaviour of the giant dipole resonance in highly excited nuclei

A study of the statistical decay of the giant dipole resonance (GDR) built on excited nuclear states provides information on nuclear properties at finite temperature and moderate spin. The results of a systematic investigation of GDR properties at high excitation covering a wide mass range, A approximately 40-170 are presented. The observed resonance strengths and mean resonance energies vary smoothly as a function of mass and are in agreement with the properties of the ground-state GDR. The widths and resonance shapes of the GDR in highly excited nuclei reflect the deformation of the nucleus at finite temperature and spin.