Contribution of excited states to stellar weak-interaction rates in odd-A nuclei

Abstract

Weak-interaction rates, including beta-decay and electron capture, are studied in several odd-A nuclei in the pf-shell region at various densities and temperatures of astrophysical interest. Special attention is paid to the relative contribution to these rates of thermally populated excited states in the decaying nucleus. The nuclear structure involved in the weak processes is studied within a quasiparticle random-phase approximation with residual interactions in both particle-hole and particle-particle channels on top of a deformed Skyrme Hartree-Fock mean field with pairing correlations. In the range of densities and temperatures considered, it is found that the total rates do not differ much from the rates of the ground state fully populated. In any case, the changes are not larger than the uncertainties due to the nuclear model dependence of the rates.

13 pages, 20 figures. arXiv admin note: substantial text overlap with arXiv:1304.2155

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• Electron-capture decay in isotopic transfermium chains from self-consistent calculations
• Competition between weak and alpha-decay modes in superheavy nuclei
• Neutrino Spectra from Nuclear Weak Interactions in $sd$-Shell Nuclei Under Astrophysical Conditions
• Beta decay and electron capture rates on manganese isotopes in astrophysical environments
• Energy Rates Due to Weak Decay Rates of Vanadium Isotopes in Stellar Environment
• Lepton capture rates due to isotopes of vanadium in astrophysical environment
• Weak interaction rates of $sd$-shell Urca pairs in stellar environment using a shell-model approach
• Lepton emission rates of 43-64V isotopes under stellar conditions
• Impact of microscopic structural transitions on particle stability and lifetimes of hot nuclei