Pygmy dipole resonances in relativistic random phase approximation

Vretenar, Dario and Paar, Nils and Ring, Peter and Lalazissis, G. A. (2001) Pygmy dipole resonances in relativistic random phase approximation. Physical Review C, 63 (4). pp. 47301-4. ISSN 0556-2813

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The isovector dipole response in 208Pb is described in the framework of a fully self-consistent relativistic random phase approximation. The NL3 parameter set for the effective mean-field Lagrangian with nonlinear meson self-interaction terms, used in the present calculations, reproduces ground state properties as well as the excitation energies of giant resonances in nuclei. In addition to the isovector dipole resonance in $^{208}$Pb, the present analysis predicts the occurrence of low-lying E1 peaks in the energy region between 7 and 11 MeV. In particular, a collective state has been identified whose dynamics correspond to that of a dipole pygmy resonance: the vibration of the excess neutrons against the inert core composed of equal number of protons and neutrons.

Item Type: Article
Keywords: isovector dipole resonances, relativistic random phase approximation
Date: February 2001
Subjects: NATURAL SCIENCES > Physics > Nuclear Physics
Additional Information: Copyright (2001) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119211
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 23 May 2014 08:23
Last Modified: 23 May 2014 08:23

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