The nuclear ground-state properties and stellar electron emission rates of 76Fe, 78Ni, 80Zn, 126Ru, 128Pd and 130Cd using RMF and pn-QRPA models

Abstract

Our study consists of investigations of nuclear ground state properties and weak transition rates of even even waiting point nuclei. The calculation was performed for N = 50 and N = 82 nuclei. The Relativistic Mean Field (RMF) model was used to explore the nuclear ground state properties of selected nuclei. The proton neutron quasi particle random phase (pnQRPA) model was used for the computation of allowed Gamow Teller (GT) and unique first forbidden (U1F) transitions of the selected waiting point nuclei. The RMF approach with different density dependent interactions, DD ME2 and DD PC1, was used to compute potential energy curves and surfaces, quadrupole moments, deformation parameters, binding energies, proton neutron separation energies, charge, and radii. The RMF computed deformation parameters were used in the pn QRPA model, as a free parameter, for the computation of GT and U1F weak transitions. We investigated three different sets of deformation parameter for the calculation of electron emission rates. The rates changed considerably with change in deformation parameter. We later investigated contribution of allowed GT and U1F rates and competition between positron capture and electron emission rates at high stellar temperatures. The computed positron capture rates were significant especially at low densities and high temperatures.

32 Pages, 12 Tables, 10 Figures

References in corpus (22)

• Nuclear ground-state masses and deformations: FRDM(2012)
• Relativistic Continuum Hartree Bogoliubov Theory for Ground State Properties of Exotic Nuclei
• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• Nuclear weak-interaction processes in stars
• Relativistic Nuclear Energy Density Functionals: adjusting parameters to binding energies
• Superallowed 0+ to 0+ nuclear beta decays: A new survey with precision tests of the conserved vector current hypothesis and the standard model
• Systematic study of deformed nuclei at the drip lines and beyond
• Large scale evaluation of beta-decay rates of r-process nuclei with the inclusion of first-forbidden transitions
• DIRHB -- a relativistic self-consistent mean-field framework for atomic nuclei
• Half Life of the Doubly-magic r-Process Nucleus 78Ni
• Dynamical r-process studies within the neutrino-driven wind scenario and its sensitivity to the nuclear physics input
• Weak Interaction Rates Of sd-Shell Nuclei In Stellar Environment Calculated in the Proton-Neutron Quasiparticle Random Phase Approximation
• Shell-model half-lives for the N=82 nuclei and their implications for the r-process
• Global Description of Beta Decay with the Axially-Deformed Skyrme Finite Amplitude Method: Extension to Odd-Mass and Odd-Odd Nuclei
• The beta-delayed neutron emission in 78Ni region
• Microscopic Calculations of Weak Interaction Rates of Nuclei in Stellar Environment for A = 18 to 100
• Shell model half-lives for r-process N=82 nuclei
• Dependence of weak interaction rates on the nuclear composition during stellar core collapse
• Constraints on neutron skin thickness in 208Pb and density-dependent symmetry energy
• First-forbidden $\beta$-decay rates, energy rates of $\beta$-delayed neutrons and probability of $\beta$-delayed neutron emissions for neutron-rich nickel isotopes
• First-forbidden transitions and stellar $\beta$-decay rates of Zn and Ge isotopes
• Allowed and unique first-forbidden stellar electron emission rates of neutron-rich copper isotopes

Cited by in corpus (3)

• Re-analysis of the Gamow-Teller distributions for N=Z nuclei, 24Mg, 28Si, and 32S
• Impact of the Brink Axel Hypothesis on Unique First Forbidden \b{eta} transitions for r process nuclei
• $\beta$-Decay Properties of Neutron-rich Yttrium Isotopes