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Isotopic dependence of the pygmy dipole resonance

Paar, N. and Nikšić, T. and Vretenar, D. and Ring, P. (2005):
Isotopic dependence of the pygmy dipole resonance.
In: Physics Letters B, p. 288, 606, (3-4), ISSN 03702693,
[Online-Edition: http://dx.doi.org/10.1016/j.physletb.2004.12.011],
[Article]

Item Type: Article
Erschienen: 2005
Creators: Paar, N. and Nikšić, T. and Vretenar, D. and Ring, P.
Title: Isotopic dependence of the pygmy dipole resonance
Language: English
Journal or Publication Title: Physics Letters B
Volume: 606
Number: 3-4
Divisions: DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
05 Department of Physics
05 Department of Physics > Institute of Nuclear Physics
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC) > D: Theoretische Kernstrukturphysik
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC) > D: Theoretische Kernstrukturphysik > D2: Kernstrukturuntersuchungen mit Relevanz für das experimentelle Programm
Date Deposited: 20 Jun 2011 07:12
Official URL: http://dx.doi.org/10.1016/j.physletb.2004.12.011
Identification Number: doi:10.1016/j.physletb.2004.12.011
Alternative Abstract:
Alternative abstract Language
The isotopic dependence of the excitation energies of the pygmy dipole resonance (PDR) is analyzed in the framework of the self-consistent relativistic Hartree-Bogoliubov (RHB) model and the relativistic quasiparticle random-phase approximation (RQRPA). The DD-ME1 density-dependent meson-exchange interaction is used in the effective mean-field Lagrangian, and pairing correlations are described by the pairing part of the finite-range Gogny interaction D1S. Model calculations reproduce available experimental data on charge radii, the neutron skin, neutron separation energies, and excitation energies of isovector giant dipole resonances in Ni, Sn and Pb nuclei. In all three isotopic chains the one-neutron separation energies decrease with mass number much faster than the excitation energies of the PDR. As a result, already at moderate proton-neutron asymmetry the PDR peak energy is calculated above the neutron emission threshold. This result has important implications for the observation of the PDR in ([gamma],[gamma]') experiments.English
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