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

Autori
Paar, Nils ; Nikšić, Tamara ; Marketin, Tomislav ; Vretenar, Dario ; Ring, Peter

Izvornik
The European Physical Journal A - Hadrons and Nuclei (1434-6001) 25 (2005), 1; 531-534

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, kongresno priopcenje, znanstveni

Ključne riječi
21.60.Jz Hartree-Fock and random-phase approximations - 21.30.Fe Forces in hadronic systems and effective interactions - 24.10.Jv Relativistic models

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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