Stellar electron-capture rates in pf-shell nuclei from quasiparticle random-phase approximation calculations

Abstract

Electron-capture rates at different density and temperature conditions are evaluated for a set of pf-shell nuclei representative of the constituents in presupernova formations. The nuclear structure part of the problem is described within a quasiparticle random-phase approximation based on a deformed Skyrme Hartree-Fock selfconsistent mean field with pairing correlations and residual interactions in particle-hole and particle-particle channels. The energy distributions of the Gamow-Teller strength are evaluated and compared to benchmark shell-model calculations and experimental data extracted from charge-exchange reactions. The model dependence of the weak rates are discussed and the various sensitivities to both density and temperature are analyzed.

18 pages, 26 figures. arXiv admin note: text overlap with arXiv:1102.0628

References in corpus (32)

• Nuclear Ground-State Masses and Deformations
• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• Shell-model calculations of stellar weak interaction rates: II. Weak rates for nuclei in the mass range A=45-65 in supernovae environment
• Nuclear weak-interaction processes in stars
• New effective interaction for $pf$-shell nuclei and its implications for the stability of the $N$=$Z$=28 closed core
• Shell model study of the isobaric chains A=50, A=51 and A=52
• Effective interaction for pf-shell nuclei
• The consequences of nuclear electron capture in core collapse supernovae
• Shell model calculations of stellar weak interaction rates: I. Gamow-Teller distributions and spectra of nuclei in the mass range A=45-65
• Presupernova Evolution with Improved Rates for Weak Interactions
• Quasiparticle random phase approximation based on the relativistic Hartree-Bogoliubov model II: Nuclear spin and isospin excitations
• Weak Interaction Rates Of sd-Shell Nuclei In Stellar Environment Calculated in the Proton-Neutron Quasiparticle Random Phase Approximation
• Deformation of the N=Z nucleus 76Sr using beta-decay studies
• Shapes and beta decay in proton rich Ge, Se, Kr and Sr isotopes
• GT strengths and electron-capture rates for pf-shell nuclei of relevance for late stellar evolution
• Beta decay and shape isomerism in 74Kr
• Spin-isospin excitations and beta+/EC half-lives of medium-mass deformed nuclei
• Calculation of stellar electron-capture cross sections on nuclei based on microscopic Skyrme functionals
• Beta-decay in odd-A and even-even proton-rich Kr isotopes
• Beta-decay properties of Zr and Mo neutron-rich isotopes
• Gamow-Teller strength distributions in fp-shell nuclei
• Measurement of the Gamow-Teller Strength Distribution in 58Co via the 58Ni(t,3He) reaction at 115 MeV/nucleon
• Stellar weak decay rates in neutron-deficient medium-mass nuclei
• Shape mixing and beta-decay properties of neutron-deficient Kr and Sr isotopes
• Gamow-Teller strength distributions in Fe and Ni stable isotopes
• Half-lives of rp-process waiting point nuclei
• Weak interaction rates for Kr and Sr waiting-point nuclei under rp-process conditions
• Gamow-Teller transitions to 64-Cu measured using the 64-Zn(t,3-He) reaction
• Electron Capture Strength for {60,62}Ni and {58,60,62,64}Ni(p,n){58,60,62,64}Cu reactions at 134.3 MeV
• Weak-interaction mediated rates on iron isotopes for presupernova evolution of massive stars
• Ground and excited states Gamow-Teller strength distributions of iron isotopes and associated capture rates for core-collapse simulations
• Nickel isotopes in stellar matter

Cited by in corpus (24)

• Modification of the Brink-Axel Hypothesis for High Temperature Nuclear Weak Interactions
• Effects of deformation on the beta-decay patterns of light even-even and odd-mass Hg and Pt isotopes
• Impact of complex many-body correlations on electron capture in thermally excited nuclei around ${}^{78}$Ni
• Sensitivity of Type Ia supernovae to electron capture rates
• Inelastic neutrino scattering off hot nuclei in supernova environments
• Microscopic calculations of weak decays in superheavy nuclei
• Contribution of excited states to stellar weak-interaction rates in odd-A nuclei
• Description of ${}^{93}$Nb stellar electron-capture rates by the Projected Shell Model
• Self-consistent calculations of electron-capture decays in Z=118, 119, and 120 superheavy isotopes
• Competition between weak and alpha-decay modes in superheavy nuclei
• Shell-model study of ${\beta }^{+}$/EC-decay half-lives for $Z=21-30$ nuclei
• Electron-capture decay in isotopic transfermium chains from self-consistent calculations
• Beta decay and electron capture rates on manganese isotopes in astrophysical environments
• The Skyrme-TQRPA calculations of electron capture on hot nuclei in pre-supernova environment
• Gamow-Teller strength and lepton captures rates on 66-71Ni in stellar matter
• Nuclear Weak Rates and Detailed Balance in Stellar Conditions
• Study of Gamow-Teller strength and associated weak-rates on odd-A nuclei in stellar matter
• Competition of deformation and neutron-proton pairing in Gamow-Teller transitions for ${}^{56,58}$Ni and ${}^{62,64}$Ni
• Theory of nuclear collective vibrations
• Energy Rates Due to Weak Decay Rates of Vanadium Isotopes in Stellar Environment
• Lepton capture rates due to isotopes of vanadium in astrophysical environment
• Nuclear structure properties and decay rates of molybdenum isotopes
• Comprehensive neutrino light curves and spectra: from pre-supernova evolution to early supernova phase
• Electron capture and \b{eta}-decay rates for nuclei with A=65-80