Quasiparticle-vibration coupling effects on nuclear transitions of astrophysical interest

Abstract

The relativistic quasiparticle time-blocking approximation (RQTBA) is applied to the description of nuclear excitation modes of astrophysical interest. This method is based on the meson-nucleon Lagrangian and goes beyond the standard relativistic quasiparticle random-phase approximation (RQRPA) by treating the coupling between single quasiparticles and collective vibrations of the nucleus. We calculate electric dipole transitions and Gamow-Teller modes in the (p,n) direction in a few Sn isotopes and obtain the rates of (n,$\gamma$) reaction and ${\beta }^{-}$-decay processes, which govern the r-process nucleosynthesis, in a unified RQTBA framework. Gamow-Teller transitions in the (n,p) branch, which in principle can serve for the modeling of stellar evolution, are also investigated, and ${}^{90}$Zr is taken as a study case.

10 pages, 8 figures. Contribution to the proceedings of the Fifth Conference on Nuclei and Mesoscopic Physics (NMP17), East Lansing, USA, March 6-10, 2017

References in corpus (12)

• A New Parameterization for the Lagrangian Density of Relativistic Mean Field Theory
• The effective force NL3 revisited
• Spin-isospin resonances: A self-consistent covariant description
• Relativistic quasiparticle time blocking approximation. Dipole response of open-shell nuclei
• Particle-vibration coupling within covariant density functional theory
• Low-lying dipole response in the Relativistic Quasiparticle Time Blocking Approximation and its influence on neutron capture cross sections
• Determination of the Gamow-Teller Quenching Factor from Charge Exchange Reactions on 90Zr
• Subtraction method and stability condition in the extended RPA theories
• Relativistic quasiparticle time blocking approximation. II. Pygmy dipole resonance in neutron-rich nuclei
• Nuclear response theory for spin-isospin excitations in a relativistic quasiparticle-phonon coupling framework
• Fragmentation of spin-dipole strength in ${}^{90}$Zr and ${}^{208}$Pb
• Astronomy with Radioactivities: Chapter 9, Nuclear Reactions

Cited by in corpus (1)

• Excitation spectra of exotic nuclei in a self-consistent phonon-coupling model