Beta-decay properties of neutron-rich Ge, Se, Kr, Sr, Ru, and Pd isotopes from deformed quasiparticle random-phase approximation

Abstract

Beta-decay properties of even and odd-A neutron-rich Ge, Se, Kr, Sr, Ru, and Pd isotopes involved in the astrophysical rapid neutron capture process are studied within a deformed proton-neutron quasiparticle random-phase approximation. The underlying mean field is described self-consistently from deformed Skyrme Hartree-Fock calculations with pairing correlations. Residual interactions in the particle-hole and particle-particle channels are also included in the formalism. The isotopic evolution of the various nuclear equilibrium shapes and the corresponding charge radii are investigated in all the isotopic chains. The energy distributions of the Gamow-Teller strength as well as the beta-decay half-lives are discussed and compared with the available experimental information. It is shown that nuclear deformation plays a significant role in the description of the decay properties in this mass region. Reliable predictions of the strength distributions are essential to evaluate decay rates in astrophysical scenarios.

arXiv comment16 pages, 26 figures. arXiv admin note: text overlap with arXiv:1403.1049

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• Beta decay of deformed r-process nuclei near A = 80 and A= 160, including odd-A and odd-odd nuclei, with the Skyrme finite-amplitude method
• Structural evolution in germanium and selenium nuclei within the mapped interacting boson model based on the Gogny energy density functional
• Quasi-particle random phase approximation with quasi-particle-vibration coupling: application to the Gamow-Teller response of the superfluid nucleus ${}^{120}$Sn
• Microscopic calculations of weak decays in superheavy nuclei
• Calculation of $\beta$-decay half-lives with Skyrme Hartree-Fock-Bogoliubov+$pn$-QRPA and isoscalar pairing strengths optimized by a Bayesian method
• Contribution of excited states to stellar weak-interaction rates in odd-A nuclei
• Multi-neutron emission of Cd isotopes
• Investigation of Nuclear Structure and $\beta$-decay Properties of As Isotopes
• Beta-decay properties of neutron-rich Ca, Ti, and Cr isotopes
• Beta-decay properties of neutron-rich rare-earth isotopes
• Low-energy structure and $\beta$ decay properties of neutron-rich nuclei in the region of a shape phase transition
• Competition between allowed and first-forbidden $\beta$ decay in $r$-process waiting-point nuclei within a relativistic beyond-mean-field approach
• Competition between weak and alpha-decay modes in superheavy nuclei
• $\beta$-decay half-lives as an indicator of shape-phase transition in neutron-rich Zr isotopes with particle-vibration coupling effect
• Self-consistent calculations of electron-capture decays in Z=118, 119, and 120 superheavy isotopes
• Electron-capture decay in isotopic transfermium chains from self-consistent calculations
• Mean-field calculations of charge radii in ground and isomeric states of Cd isotopes
• Simultaneous description of $\beta$ decay and low-lying structure of neutron-rich even- and odd-mass Rh and Pd nuclei
• Shape coexistence close to $N=50$ in the neutron-rich isotope ${}^{80}$Ge investigated by IBM-2
• Effect of Pauli principle on the deformed QRPA calculations and its consequence in the $\beta$-decay calculations of deformed even-even nuclei
• Parameter dependence of the $\beta$-decay properties of neutron-rich Zr isotopes within the interacting boson model
• Elastic Electron Scattering from Deformed and Oriented Odd-A Nuclei
• Sensitivity analysis of $\beta$-decay half-life predictions for Ge, As, Zr and Mo nuclei within the mapped interacting boson model
• Quadrupole deformation signatures in elastic electron scattering from oriented odd-A nuclei