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HK: Physik der Hadronen und Kerne

HK 40: Theorie

HK 40.3: Vortrag

Mittwoch, 9. März 2005, 14:45–15:00, TU MA005

Collective excitation phenomena and beta-decays in exotic nuclei — •Nils Paar¹, Tamara Niksic², Peter Ring², and Dario Vretenar³ — ¹TU-Darmstadt — ²TU-Muenchen — ³University of Zagreb

The excitation phenomena in unstable nuclei are analyzed in the framework of the relativistic quasiparticle RPA which is extended to include new interactions with density-dependent meson-nucleon couplings. The properties of the pygmy dipole resonance (PDR) are examined within isotopic chains, showing that already at moderate proton-neutron asymmetry the PDR peak energy is located above the neutron emission threshold, resulting with important implications for (gama,gama’) experiments and r-process calculations. A method is suggested for determining the size of the neutron skin, based on the difference of the excitation energies of the Gamow-Teller resonance and the isobaric analog state. In addition, the present model is also employed in calculations of beta-decay half-lives of nuclei of the relevance for the r-process.

Work supported in part by DFG.

N. Paar et al., Phys. Rev. C 67, 034312 (2003).

D. Vretenar et al., Phys. Rev. Lett. 91, 262502 (2003).

N. Paar et al., Phys. Rev. C 69, 054303 (2004).

N. Paar et al., nucl-th/0404055, submitted to Phys. Lett. B (2004).