β-decay rates of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>r</mml:mi></mml:mrow></mml:math>-process nuclei in the relativistic quasiparticle random phase approximation

Nikšić, Tamara; Marketin, Tomislav; Vretenar, Dario; Paar, Nils; Ring, P.

doi:10.1103/physrevc.71.014308

Cited by 86 publications

(130 citation statements)

References 30 publications

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“…and Sr [12]; similar calculations with Gogny interaction in the N = 82, 126, 184 isotonic chains [13]; relativistic pnQRPA [14] for 20 ≤ Z ≤ 50; and relativistic pnQRPA for N ≈ 50, 82 [15].…”

Section: Introductionmentioning

confidence: 71%

Global description ofβ−decay in even-even nuclei with the axially-deformed Skyrme finite-amplitude method

2016

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We use the finite amplitude method for computing charge-changing Skyrme-QRPA transition strengths in axially-deformed nuclei together with a modern Skyrme energy-density functional to fit several previously unconstrained parameters in the charge-changing time-odd part of the functional. With the modified functional we then calculate rates of beta-minus decay for all medium-mass and heavy even-even nuclei between the valley of stability and the neutron drip line. We fit the Skyrme parameters to a limited set of beta-decay rates, a set of Gamow-Teller resonance energies, and a set of spin-dipole resonance energies, in both spherical and deformed nuclei. Comparison to available experimental beta-decay rates shows agreement at roughly the same level as in other global QRPA calculations. We estimate the uncertainty in our rates all the way to the neutron drip line through a construction that extrapolates the errors of known beta-decay rates in nuclei with intermediate Q values to less stable isotopes with higher Q values.

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Section: Introductionmentioning

confidence: 71%

Global description ofβ−decay in even-even nuclei with the axially-deformed Skyrme finite-amplitude method

2016

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“…These main configurations are generally formed by the neutron levels with higher occupation probabilities and the proton levels with lower occupation probabilities, therefore, the influence of T = 0 pairing interaction is very small and hence their β-decay half-lives are overestimated. In fact, this phenomenon is a common problem in the self-consistent relativistic QRPA calculations [53,[60][61][62].…”

Section: B Spin-isospin Excitationsmentioning

confidence: 99%

Self-consistent relativistic quasiparticle random-phase approximation and its applications to charge-exchange excitations

Niu

Liang

et al. 2017

Phys. Rev. C

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The self-consistent quasiparticle random-phase approximation (QRPA) approach is formulated in the canonical single-nucleon basis of the relativistic Hatree-Fock-Bogoliubov (RHFB) theory.This approach is applied to study the isobaric analog states (IAS) and Gamov-Teller resonances (GTR) by taking Sn isotopes as examples. It is found that self-consistent treatment of the particleparticle residual interaction is essential to concentrate the IAS in a single peak for open-shell nuclei and the Coulomb exchange term is very important to predict the IAS energies. For the GTR, the isovector pairing can increase the calculated GTR energy, while the isoscalar pairing has an important influence on the low-lying tail of the GT transition. Furthermore, the QRPA approach is employed to predict nuclear β-decay half-lives. With an isospin-dependent pairing interaction in the isoscalar channel, the RHFB+QRPA approach almost completely reproduces the experimental β-decay half-lives for nuclei up to the Sn isotopes with half-lives smaller than one second. Large discrepancies are found for the Ni, Zn, and Ge isotopes with neutron number smaller than 50, as well as the Sn isotopes with neutron number smaller than 82. The potential reasons for these discrepancies are discussed in detail.

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“…The available continuum QRPA calculations with DF3a agree well with the half-lives of both Fe and Zn isotopes. The overestimation of half-lives for Ni isotopes with neutron number before N = 50 shell closure is a common problem in self-consistent relativistic QRPA calculations, which is also found in RHB+QRPA model with the meson-exchange effective interactions [24,25,27]. By increasing the nucleon effective mass, half-lives of Ni isotopes can be reduced, hence become close to the experimental data.…”

mentioning

confidence: 78%

“…By increasing the nucleon effective mass, half-lives of Ni isotopes can be reduced, hence become close to the experimental data. However, the increase of m * in relativistic model is limited by a realistic description of nuclear matter equation of state and ground-state properties of finite nuclei [24,25]. Therefore, some other effects in mean field framework, such as tensor force, and the effects beyond the mean field, such as the particle vibration coupling effect, should be investigated for better reproducing nuclear β-decay half-lives.…”

mentioning

confidence: 99%

Nuclearβ-decay half-lives in the relativistic point-coupling model

Wang

Niu

et al. 2016

J. Phys. G: Nucl. Part. Phys.

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The self-consistent proton-neutron quasiparticle random phase approximation approach is employed to calculate β-decay half-lives of neutron-rich even-even nuclei with 8 Z 30. A newly proposed nonlinear point-coupling effective interaction PC-PK1 is used in the calculations. It is found that the isoscalar proton-neutron pairing interaction can significantly reduce β-decay half-lives. With an isospin-dependent isoscalar proton-neutron pairing strength, our results well reproduce the experimental β-decay half-lives, although the pairing strength is not adjusted using the half-lives calculated in this study.

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β-decay rates ofr-process nuclei in the relativistic quasiparticle random phase approximation

Cited by 86 publications

References 30 publications

Global description ofβ−decay in even-even nuclei with the axially-deformed Skyrme finite-amplitude method

Global description ofβ−decay in even-even nuclei with the axially-deformed Skyrme finite-amplitude method

Self-consistent relativistic quasiparticle random-phase approximation and its applications to charge-exchange excitations

Nuclearβ-decay half-lives in the relativistic point-coupling model

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