Particle-hole strength excited in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>48</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>(p,n<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>48</mml:mn></mml:m

We use a deformed quasiparticle random phase approximation formalism to describe simultaneously the energy distributions of the single ␤ Gamow-Teller strength and the two-neutrino double ␤ decay matrix elements. Calculations are performed in a series of double ␤ decay partners with A = 48, 76, 82, 96, 100, 116, 128, 130, 136, and 150, using deformed Woods-Saxon potentials and deformed Skyrme Hartree-Fock mean fields. The formalism includes a quasiparticle deformed basis and residual spin-isospin forces in the particlehole and particle-particle channels. We discuss the sensitivity of the parent and daughter Gamow-Teller strength distributions in single ␤ decay, as well as the sensitivity of the double ␤ decay matrix elements to the deformed mean field and to the residual interactions. Nuclear deformation is found to be a mechanism of suppression of the two-neutrino double ␤ decay. The double ␤ decay matrix elements are found to have maximum values for about equal deformations of parent and daughter nuclei. They decrease rapidly when differences in deformations increase. We remark on the importance of a proper simultaneous description of both double ␤ decay and single Gamow-Teller strength distributions. Finally, we conclude that for further progress in the field, it would be useful to improve and complete the experimental information on the studied Gamow-Teller strengths and nuclear deformations.

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“…The resonance in 48 Ca reported at 10 MeV in Ref. [29] and used in the fitting procedure of Ref. [8] is also in good agreement with our results.…”

Section: Gamow-teller Strength Distributionssupporting

confidence: 82%

Deformed quasiparticle random phase approximation formalism for single- and two-neutrino doubleβdecay

et al. 2004

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“…Recent experimental data on GT distributions in iron group nuclei [57,58,59,60,61,62,63,64], measured in charge exchange reactions [65,66], show that the GT strength is strongly quenched (reduced), compared with the independent-particle-model value, and fragmented over many states in the daughter nucleus. Both effects are caused by the residual interaction among the valence nucleons.…”

Section: B(gt +mentioning

confidence: 99%

Nuclear input for core-collapse models

2006

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“…The experimental Gamow-Teller resonance energies are from Refs. [28][29][30][31][32], the spin-dipole resonance energies from Refs. [33,34], and the half-lifes from Ref.…”

Section: Skyrme Functional and Computational Methodsmentioning

confidence: 99%

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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Particle-hole strength excited in theCa48(p,n)48

Cited by 91 publications

References 39 publications

Deformed quasiparticle random phase approximation formalism for single- and two-neutrino doubleβdecay

Deformed quasiparticle random phase approximation formalism for single- and two-neutrino doubleβdecay

Nuclear input for core-collapse models

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

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