Stellar electron-capture rates on nuclei based on Skyrme functionals

Fantina, Anthea; Khan, E.; Paar, Nils; Vretenar, Dario

doi:10.1051/epjconf/20146602035

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…A fully self-consistent microscopic framework for the evaluation of nuclear weak-interaction rates at finite temperature based on Skyrme functionals was developed in Refs. [18][19][20]. The single-nucleon basis and corresponding thermal occupation factors were determined using the finite-temperature Skyrme Hartree-Fock model.…”

Section: Introductionmentioning

confidence: 99%

Stellar electron-capture rates based on finite-temperature relativistic quasiparticle random-phase approximation

et al. 2020

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The electron-capture process plays an important role in the evolution of the core collapse of a massive star that precedes the supernova explosion. In this study, the electron capture on nuclei in stellar environment is described in the relativistic energy density functional framework, including both the finite-temperature and nuclear pairing effects. Relevant nuclear transitions J π = 0 ± , 1 ± , 2 ± are calculated using the finite-temperature proton-neutron quasiparticle random-phase approximation with the density-dependent meson-exchange effective interaction DD-ME2. The pairing and temperature effects are investigated in the Gamow-Teller transition strength as well as the electron-capture cross sections and rates for 44 Ti and 56 Fe in the stellar environment. It is found that the pairing correlations establish an additional unblocking mechanism similar to the finite-temperature effects, that can allow otherwise blocked single-particle transitions. Inclusion of pairing correlations at finite temperature can significantly alter the electron-capture cross sections, even up to a factor of 2 for 44 Ti, while for the same nucleus electron-capture rates can increase by more than one order of magnitude. We conclude that for the complete description of electron capture on nuclei both pairing and temperature effects must be taken into account.

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Section: Introductionmentioning

confidence: 99%

Stellar electron-capture rates based on finite-temperature relativistic quasiparticle random-phase approximation

et al. 2020

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Stellar electron capture rates based on finite temperature relativistic quasiparticle random-phase approximation

Ravlic,

Yuksel,

Niu

et al. 2020

Preprint

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The electron capture process plays an important role in the evolution of the core collapse of a massive star that precedes the supernova explosion. In this study, the electron capture on nuclei in stellar environment is described in the relativistic energy density functional framework, including both the finite temperature and nuclear pairing effects. Relevant nuclear transitions J π = 0 ± , 1 ± , 2 ± are calculated using the finite temperature proton-neutron quasiparticle random phase approximation with the density-dependent meson-exchange effective interaction DD-ME2. The pairing and temperature effects are investigated in the Gamow-Teller transition strength as well as the electron capture cross sections and rates for 44 Ti and 56 Fe in stellar environment. It is found that the pairing correlations establish an additional unblocking mechanism similar to the finite temperature effects, that can allow otherwise blocked single-particle transitions. Inclusion of pairing correlations at finite temperature can significantly alter the electron capture cross sections, even up to a factor of two for 44 Ti, while for the same nucleus electron capture rates can increase by more than one order of magnitude. We conclude that for the complete description of electron capture on nuclei both pairing and temperature effects must be taken into account.

show abstract

Stellar electron-capture rates on nuclei based on Skyrme functionals

Cited by 2 publications

References 19 publications

Stellar electron-capture rates based on finite-temperature relativistic quasiparticle random-phase approximation

Stellar electron-capture rates based on finite-temperature relativistic quasiparticle random-phase approximation

Stellar electron capture rates based on finite temperature relativistic quasiparticle random-phase approximation

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