I. N. Borzov

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

The effects of the phonon-phonon coupling on the β-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 (FRSA) 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 β − -decay half-lives are decreased significantly. By using the Skyrme interaction SGII together with a volume-type pairing interaction, we illustrate this reduction effect by comparing with available experimental data for Ni isotopes and neutron-rich N = 50 isotones. We give predictions for 76 Fe and 80 Ni in comparison with the case of the doubly magic nucleus 78 Ni which is an important waiting point in the r process.

β-γ and β-delayed neutron-γ decay of neutron-rich copper isotopes

The {beta}-decay properties of neutron-rich Cu isotopes produced in proton-induced fission of {sup 238}U were studied at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The data were collected using high-resolution online mass separation, reacceleration, and digital {beta}-{gamma} spectroscopy methods. An improved decay scheme of N = 49 {sup 78}Cu and the first observation of N = 50 {sup 79}Cu {beta}-delayed neutron decay followed by a gamma transition are reported. Spin and parity (5{sup -}) are deduced for {sup 78gs}Cu. The {beta}-delayed neutron branching ratios (P{sub {beta}n}) for the {sup 77}Cu and {sup 79}Cu precursors are analyzed with the help of nuclear structure models.

Multi-neutron emission of Cd isotopes

An influence of the phonon-phonon coupling (PPC) on the

Complex configuration effects on β-decay rates

beta

Sensitivity of β -decay rates to the radial dependence of the nucleon effective mass

-decay half-lives and multi-neutron emission probabilities is analysed within the microscopic model based on the Skyrme interaction with tensor components included. The finite-rank separable approximation is used in order to handle large two-quasiparticle spaces. The even-even nuclei near the r-process pathes at

Impact of Tensor Interaction on Beta-Delayed Neutron Emission from Neutron-Rich Nickel Isotopes

N=82

Gamow-Teller decay studies with 2p-2h configurations

are studied. The characteristics of ground states,

FINITE RANK SEPARABLE APPROXIMATION FOR SKYRME INTERACTIONS: SPIN-ISOSPIN EXCITATIONS

2^+

Low-lying intruder and tensor-driven structures in As-82 revealed by beta decay at a new movable-tape-based experimental setup

excitations and

New half-lives of very neutron-rich iron isotopes

beta