Delayed Multineutron Emission in the Region of Heavy Calcium Isotopes

A brief survey of self-consistent models used to perform global calculations of β -decay properties of neutron-rich nuclei is given. These models include the continuum quasiparticle randomphase approximation (CQRPA) based on the energy density functional (DF) proposed by Fayans and his colleagues (D...

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Bibliographic Details
Published in:Physics of atomic nuclei 2018-11, Vol.81 (6), p.680-694
Main Author: Borzov, I. N.
Format: Article
Language:English
Subjects:
Approximation
Calcium isotopes
Decay
Flux density
Forbidden transitions
Isotopes
Mathematical analysis
Neutron emission
Neutrons
Nuclei
Nuclei (nuclear physics)
Particle and Nuclear Physics
Physics
Physics and Astronomy
Potassium
Rare earth metal compounds
Rare earth metals
Relativism
Relativistic effects
Scandium isotopes
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Summary:A brief survey of self-consistent models used to perform global calculations of β -decay properties of neutron-rich nuclei is given. These models include the continuum quasiparticle randomphase approximation (CQRPA) based on the energy density functional (DF) proposed by Fayans and his colleagues (DF + CQRPA), relativistic quasiparticle random-phase approximation (RQRPA), and the finite-amplitude method (FAM). These models take into account allowed Gamow–Teller transitions and first-forbidden transitions. Models that allow for complex configurations beyond the QRPA framework are also analyzed. The β -decay properties of heavy calcium, potassium, and scandium isotopes in the vicinity of the N = 32 and 34 neutron subshells, which are new magic subshells for neutrons, are calculated on the basis of the self-consistent DF + CQRPA approach. The predicted high probability for two-neutron emission is found to be correlated with the anomalous nuclear radii measured for potassium and calcium isotopes in the region around N = 32. The results ofDF3 + CQRPA calculations are compared with their counterparts obtained within the self-consistent models implemented with the SkO’ Skyrme functional and the D3C* relativistic functional.
ISSN:1063-7788
1562-692X
DOI:10.1134/S1063778818060066