First-forbidden $\beta$-decay rates, energy rates of $\beta$-delayed neutrons and probability of $\beta$-delayed neutron emissions for neutron-rich nickel isotopes

Abstract

First-forbidden (FF) transitions can play an important role in decreasing the calculated half-lives specially in environments where allowed Gamow-Teller (GT) transitions are unfavored. Of special mention is the case of neutron-rich nuclei where, due to phase-space amplification, FF transitions are much favored. We calculate the allowed GT transitions in various pn-QRPA models for even-even neutron-rich isotopes of nickel. Here we also study the effect of deformation on the calculated GT strengths. The FF transitions for even-even neutron-rich isotopes of nickel are calculated assuming the nuclei to be spherical. Later we take into account deformation of nuclei and calculate GT + unique FF transitions, stellar $\beta$-decay rates, energy rate of $\beta$-delayed neutrons and probability of $\beta$-delayed neutron emissions. The calculated half-lives are in excellent agreement with measured ones and might contribute in speeding-up of the $r$-matter flow.

arXiv comment22 pages, 10 figures, 7 tables. arXiv admin note: text overlap with arXiv:1301.5225 by other authors

References in corpus (11)

• Beta Decays of Isotones with Neutron Magic Number of N=126 and R-process Nucleosynthesis
• Weak Interaction Rates Of sd-Shell Nuclei In Stellar Environment Calculated in the Proton-Neutron Quasiparticle Random Phase Approximation
• The beta-delayed neutron emission in 78Ni region
• Microscopic Calculations of Weak Interaction Rates of Nuclei in Stellar Environment for A = 18 to 100
• Ground and excited states Gamow-Teller strength distributions of iron isotopes and associated capture rates for core-collapse simulations
• Nickel isotopes in stellar matter
• Stellar ${\beta }^{\pm }$ decay rates of iron isotopes and its implications in astrophysics
• First-forbidden transitions and stellar $\beta$-decay rates of Zn and Ge isotopes
• Comparison of Gamow-Teller strengths in the random phase approximation
• Unique first-forbidden $\beta$-decay rates for neutron-rich nickel isotopes in stellar environment
• Neutrino cooling rates due to ${}^{54,55,56}$Fe for presupernova evolution of massive stars

Cited by in corpus (9)

• The nuclear ground-state properties and stellar electron emission rates of 76Fe, 78Ni, 80Zn, 126Ru, 128Pd and 130Cd using RMF and pn-QRPA models
• Unique first-forbidden $\beta$-decay transitions in odd-odd and even-even heavy nuclei
• Nuclear structure and weak rates of heavy waiting point nuclei under rp-process conditions
• $\beta$-decay of N=126 isotones for the r-process nucleosynthesis
• Gamow-Teller strength and lepton captures rates on 66-71Ni in stellar matter
• Unique forbidden beta decays at zero momentum transfer
• Allowed and unique first-forbidden stellar electron emission rates of neutron-rich copper isotopes
• On the role of pairing correlations in calculation of \b{eta}-decay half-lives within QRPA formalism
• Allowed and forbidden beta-decay log ft values of neutron-rich Pb and Bi isotopes