Elsevier

Nuclear Physics A

Volume 443, Issue 3, 7 October 1985, Pages 415-434
Nuclear Physics A

Damping of the giant dipole resonance in hot, strongly rotating nuclei

https://doi.org/10.1016/0375-9474(85)90409-9Get rights and content

Abstract

The isovector dipole density-density response of hot rotating nuclei is calculated applying a cranked deformed Nilsson potential together with a separable dipole-dipole residual interaction. The transformation of the response function from the internal rotating coordinate frame to the laboratory frame is discussed and illustrated by classical results for a charged particle moving in a harmonic-oscillator potential. Calculations for 108Sn, 152Dy and 196Pb are presented. For 108Sn at high excitation energy thermal fluctuations of the shape gives rise to a rather structureless strength function with a considerable width. For 152Dy and 196Pb superdeformed minima of the potential surface are predicted. The coupling of the giant dipole resonance to the shape degrees of freedom of superdeformed nuclei can split the vibration by ≈ 10 MeV, the lowest peak being expected at an excitation energy of ≈ 7–8 MeV and carrying ≈ 30% of the energy-weighted sum rule.

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