Relativistic quasiparticle time blocking approximation. II. Pygmy dipole resonance in neutron-rich nuclei

Journal Article · Fri May 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.054312· OSTI ID:21293719

Litvinova, E; Ring, P; Tselyaev, V; Langanke, K ^[1]

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1. GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt, Germany, Frankfurt Institute for Advanced Studies, Universitaet Frankfurt, D-60438 Frankfurt am Main, Germany, and Institute of Physics and Power Engineering, RU-249033 Obninsk (Russian Federation)

Theoretical studies of low-lying dipole strength in even-even spherical nuclei within the relativistic quasiparticle time blocking approximation (RQTBA) are presented. The RQTBA developed recently as an extension of the self-consistent relativistic quasiparticle random-phase approximation (RQRPA) enables one to investigate the effects of the coupling of two-quasiparticle excitations to collective vibrations within a fully consistent calculation scheme based on covariant energy density functional theory. Dipole spectra of even-even {sup 130}Sn-{sup 140}Sn and {sup 68}Ni-{sup 78}Ni isotopes calculated within both RQRPA and RQTBA show two well-separated collective structures: the higher lying giant dipole resonance and the lower lying pygmy dipole resonance, which can be identified by the different behavior of the transition densities of states in these regions.

• OSTI ID: 21293719
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHANNELING
COUPLING
DENSITY
DIPOLES
ENERGY DENSITY
EVEN-EVEN NUCLEI
EXCITATION
NEUTRON-RICH ISOTOPES
NICKEL 68
NICKEL 78
NICKEL ISOTOPES
QUASI PARTICLES
RANDOM PHASE APPROXIMATION
RELATIVISTIC RANGE
RESONANCE
SPECTRA
SPHERICAL CONFIGURATION
TIN 130
TIN ISOTOPES