Abstract
The extended self-consistent beta-decay model has been applied for bet-decay rates and delayed neutron emission probabilities of spherical neutron-rich isotopes near the r-process paths. Unlike a popular global FRDM+RPA model, in our fully microscopic approach, the Gamow-Teller and first-forbidden decays are treated on the same footing. The model has been augmented by blocking of the odd particle in order to account for important ground-state spin-parity inversion effect which has been shown to exist in the region of the most neutron-rich doubly-magic nucleus 78 Ni. Finally, a newly developed form of density functional DF3a has been employed which gives a better spin-orbit splitting due to the modified tensor components of the density functional.
Highlights
The region of nuclei near the most neutron-rich (N-Z/A ~ 0.28) doubly-magic 78Ni is a unique laboratory for exploring nuclear structure under extreme conditions
The model has been augmented by blocking of the odd particle in order to account for important ground-state spin-parity inversion effect which has been shown to exist in the region of the most neutron-rich doubly-magic nucleus 78Ni
It emerges due to reduced neutron binding beyond the major N=50 neutron shell, as found by the HFB with SkO functional involving the tensor term [1]
Summary
The region of nuclei near the most neutron-rich (N-Z/A ~ 0.28) doubly-magic 78Ni is a unique laboratory for exploring nuclear structure under extreme conditions. The functional is augmented by a twobody spin–orbit and tensor velocity-dependent effective nucleon–nucleon interaction The inclusion of the latter ensures a reliable description of the single-particle structure near the very neutron-rich doubly-magic nuclei 78Ni and 132Sn. In the present model we allow for quasiparticle blocking prescription. We note that the inclusion of isovector and isoscalar effective NN-interactions is essential to guarantee the SO(8) symmetry of the pnQRPA equations and to avoid unrealistic odd–even staggering of total β-decay halflives It was shown in [3] that for gξ′ = 0.2–0.3 (i.e. rather far from the instability point in the pp channel), the CQRPA-like equations of the FFS allows a reasonable description of nuclear spin–isospin modes in even and odd-A nuclei.
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