TITLE

Self-consistent relativistic QRPA studies of soft modes and spin-isospin resonances in unstable nuclei

AUTHOR(S)
Paar, N.; Nikšić, T.; Marketin, T.; Vretenar, D.; Ring, P.
PUB. DATE
August 2005
SOURCE
European Physical Journal A -- Hadrons & Nuclei;Aug2005 Supplement 1, Vol. 25, p531
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The excitation phenomena in unstable nuclei are investigated in the framework of the relativistic quasiparticle random-phase approximation (RQRPA) in the relativistic Hartree-Bogoliubov model (RHB) which is extended to include effective interactions with explicit density-dependent meson-nucleon couplings. The properties of the pygmy dipole resonance (PDR) are examined in 132Sn and within isotopic chains, showing that already at moderate proton-neutron asymmetry the PDR peak energy is located above the neutron emission threshold. A method is suggested for determining the size of the neutron skin within an isotopic chain, based on the measurement of the excitation energies of the Gamow-Teller resonance relative to the isobaric analog state. In addition, for the first time the relativistic RHB + RQRPA model, with tensor ω meson-nucleon couplings, is employed in calculations of β-decay half-lives of nuclei of the relevance for the r-process.
ACCESSION #
18188846

 

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