Giant dipole resonance width as a probe for nuclear deformation at finite excitation

Abstract

The systematic study of the correlation between the experimental giant dipole resonance (GDR) width and the average deformation <β> of the nucleus at finite excitation is presented for the mass region A ~ 59 to 208. We show that the width of the GDR (Γ) and the quadrupole deformation of the nucleus do not follow a linear relation, as predicted earlier, due to the GDR induced quadrupole moment and the correlation also depends on the mass of the nuclei. The different empirical values of <β> extracted from the experimental GDR width match exceptionally well with the thermal shape fluctuation model. As a result, this universal correlation between <β> and Γprovides a direct experimental probe to determine the nuclear deformation at finite temperature and angular momentum in the entire mass region.

5 pages, 3 Figures, Published in Phys. Rev. C 87, 044325 (2013)

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• Examination of level density prescriptions in the interpretation of high energy gamma-ray spectra
• Signature of clustering in quantum many body systems probed by the giant dipole resonance
• Investigation of giant dipole resonance in Mo isotopes within TDHF theory