Influence of 2p-2h configurations on beta-decay rates

Abstract

The effects of the phonon-phonon coupling on the beta-decay rates of neutron-rich nuclei are studied in a microscopic model based on Skyrme-type interactions. The approach uses a finite-rank separable approximation of the Skyrme-type particle-hole (p-h) residual interaction. Very large two-quasiparticle spaces can thus be treated. A redistribution of the Gamow-Teller (G-T) strength is found due to the tensor correlations and the 2p-2h fragmentation of G-T states. As a result, the beta-decay half-lives are decreased significantly. Using the Skyrme interaction SGII together with a volume-type pairing interaction we illustrate this reduction effect by comparing with available experimental data for the Ni isotopes and neutron-rich N=50 isotones. We give predictions for 76Fe and 80Ni in comparison with the case of the doubly-magic nucleus 78Ni which is an important waiting point in the r-process.

arXiv comment8 pages, 6 figures, accepted for publication in Physical Review C

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• r-Process Nucleosynthesis: Connecting Rare-Isotope Beam Facilities with the Cosmos
• Global description of beta-minus decay in even-even nuclei with the axially-deformed Skyrme finite amplitude method
• Particle-vibration coupling effect on the $\beta$-decay of magic nuclei
• First measurement of several $\beta$-delayed neutron emitting isotopes beyond N=126
• Nuclear response theory for spin-isospin excitations in a relativistic quasiparticle-phonon coupling framework
• Impact of complex many-body correlations on electron capture in thermally excited nuclei around ${}^{78}$Ni
• Influence of complex configurations on properties of pygmy dipole resonance in neutron-rich Ca isotopes
• Multi-neutron emission of Cd isotopes
• Estimation of 2p2h effect on Gamow-Teller transition with Second Tamm-Dancoff-Approximation
• $\beta$-decay half-lives as an indicator of shape-phase transition in neutron-rich Zr isotopes with particle-vibration coupling effect
• Microscopic description of the pygmy dipole resonance in neutron-rich Ca isotopes
• Strength fragmentation of Gamow-Teller transitions and delayed neutron emission of atomic nuclei
• Two-phonon structures for beta-decay theory