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

  • ENAM 2004
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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.

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Authors and Affiliations

  1. Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9, D-64289, Darmstadt, Germany

    N. Paar

  2. Physics Department, Faculty of Science, University of Zagreb, Croatia

    N. Paar, T. Nikšić, T. Marketin & D. Vretenar

  3. Institute for Nuclear Theory, University of Washington, WA, 98195, Seattle, USA

    N. Paar & T. Nikšić

  4. Physik-Department der Technischen Universität München, D-85748, Garching, Germany

    P. Ring

Authors
  1. N. Paar
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  2. T. Nikšić
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  3. T. Marketin
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  4. D. Vretenar
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  5. P. Ring
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Correspondence to N. Paar.

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Paar, N., Nikšić, T., Marketin, T. et al. Self-consistent relativistic QRPA studies of soft modes and spin-isospin resonances in unstable nuclei. Eur. Phys. J. A 25 (Suppl 1), 531–534 (2005). https://doi.org/10.1140/epjad/i2005-06-057-5

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  • DOI: https://doi.org/10.1140/epjad/i2005-06-057-5

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