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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.
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http://hal.in2p3.fr/in2p3-01079080
Contributor : Sophie Heurteau <>
Submitted on : Friday, October 31, 2014 - 10:42:01 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:29 PM

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A. P. Severyukhin, V. V. Voronov, I. N. Borzov, N. N. Arsenyev, N. Van Giai. Influence of 2p-2h configurations on beta-decay rates. Physical Review C, American Physical Society, 2014, 90, pp.044320. ⟨10.1103/PhysRevC.90.044320⟩. ⟨in2p3-01079080⟩

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