Abstract
The β-decay rates of 60Ca have been studied within a microscopic model, which is based on the Skyrme interaction T45 to construct single-particle and phonon spaces. We observe a redistribution of the Gamow–Teller strength due to the phonon-phonon coupling, considered in the model. For 60Sc, the spin-parity of the ground state is found to be 1+. We predict that the half-life of 60Ca is 0.3 ms, while the total probability of the βxn emission is 6:1%. Additionally, the random matrix theory has been applied to analyze the statistical properties of the 1+ spectrum populated in the β-decay to elucidate the obtained results.
Highlights
The multi-neutron emission is basically a multistep process consisting of (a) the β-decay of the parent nucleus (N, Z) which results in feeding the excited states of the daughter nucleus (N−1, Z+1) followed by the (b) γ-deexcitation to the ground state or (c) multineutron emissions to the ground state of the final nucleus (N−1−X, Z+1)
In the report we demonstrate the importance of the phonon-phonon coupling (PPC) on the β-delayed multi-neutron emission of the neutron-rich nucleus 60Ca discovered in [6]
One of the successful tools for studying chargeexchange nuclear modes is the quasiparticle random phase approximation (QRPA) with the self-consistent mean-field derived from a Skyrme energy-density functional (EDF)
Summary
The multi-neutron emission is basically a multistep process consisting of (a) the β-decay of the parent nucleus (N, Z) which results in feeding the excited states of the daughter nucleus (N−1, Z+1) followed by the (b) γ-deexcitation to the ground state or (c) multineutron emissions to the ground state of the final nucleus (N−1−X, Z+1) (see, e.g., Ref. [1]). Such QRPA calculations enable one to describe the properties of the parent ground state and Gamow– Teller (GT) transitions using the same EDF. The largest contribution to the calculated β-decay half-life comes from the 1+1 state, which structure is dominated by one unperturbed configuration.
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