Damping of giant dipole resonance in hot rotating nuclei

Abstract

The phonon damping model (PDM) is extended to include the effect of angular momentum at finite temperature. The model is applied to the study of damping of giant dipole resonance (GDR) in hot and noncollectively rotating spherical nuclei. The numerical results obtained for Mo88 and Sn106 show that the GDR width increases with both temperature T and angular momentum M. At T > 4 MeV and M<= 60 hbar the increase in the GDR width slows down for Sn106, whereas at M<= 80 hbar the GDR widths in both nuclei nearly saturate. By adopting the nuclear shear viscosity extracted from fission data at T= 0, it is shown that the maximal value of the angular momentum for Mo88 and Sn106 should be around 46 and 55 hbar, respectively, so that the universal conjecture for the lower bound of the specific shear viscosity for all fluids is not violated up to T= 5 MeV.

19 pages, 6 figures, accepted in Phys. Rev. C

References in corpus (5)

• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Compilation of Giant Electric Dipole Resonances Built on Excited States
• Pairing in hot rotating nuclei
• Pairing reentrance in hot rotating nuclei
• Shear-Viscosity to Entropy-Density Ratio from Giant Dipole Resonances in Hot Nuclei

Cited by in corpus (6)

• Probing the critical behavior in the evolution of GDR width at very low temperatures in A~100 mass region
• Giant dipole resonance in ${}^{201}$Tl at low temperature
• Giant dipole resonance in ${}^{88}$Mo from phonon damping model's strength functions averaged over temperature and angular momentum distributions
• Giant dipole resonance in highly excited nuclei
• Specific shear viscosity in hot rotating systems of paired fermions
• Thermal pairing and giant dipole resonance in highly excited nuclei