Charge-exchange excitations with finite-range interactions including tensor terms

Donno, V. De; Có, G.; Anguiano, M.; Lallena, A. M.

doi:10.1103/physrevc.90.024326

Cited by 10 publications

(22 citation statements)

References 59 publications

(149 reference statements)

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“…(8). Tensor terms of Gaussian form appear also in the D1ST2a and D1ST2b [37] as well as in the D1ST2c and D1MT2c [38], where beyond a tensor-isovector component a tensor-isoscalar one is included. Another important difference between the GT2 force and these last four parametrizations is that in the GT2 case the inclusion of tensor term involved a refitting of all the parameters whereas for the other cases the tensor terms have been added to the D1S or D1M without changing the values of the central parameters.…”

Section: B Gogny Force With Tensor Termsmentioning

confidence: 99%

Nuclear response functions with finite-range Gogny force: Tensor terms and instabilities

Pace

Martini

2016

Phys. Rev. C

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A fully-antisymmetrized random phase approximation calculation employing the continued fraction technique is performed to study nuclear matter response functions with the finite range Gogny force. The most commonly used parameter sets of this force, as well as some recent generalizations that include the tensor terms are considered and the corresponding response functions are shown. The calculations are performed at first and second order in the continued fraction expansion and the explicit expressions for the second order tensor contributions are given. Comparisons between first and second order continued fraction expansion results are provided. The differences between the responses obtained at the two orders turn out to be more pronounced for the forces including tensor terms than for the standard Gogny ones. In the vector channels the responses calculated with Gogny forces including tensor terms are characterized by a large heterogeneity, reflecting the different choices for the tensor part of the interaction. For the sake of comparison the response functions obtained considering a G-matrix based nuclear interaction are also shown. As a first application of the present calculation, the possible existence of spurious finite-size instabilities of the Gogny forces with or without tensor terms has been investigated. The positive conclusion is that all the Gogny forces, but the GT2 one, are free of spurious finite-size instabilities. In perspective, the tool developed in the present paper can be inserted in the fitting procedure to construct new Gogny-type forces.

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Section: B Gogny Force With Tensor Termsmentioning

confidence: 99%

Nuclear response functions with finite-range Gogny force: Tensor terms and instabilities

Pace

Martini

2016

Phys. Rev. C

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“…If we were interested in, e.g., the effects of tensor terms discussed in Refs. [17] and [18], we could take them from alreadyparametrized functionals. Such a procedure would require some parameter fitting because pairing interactions and strengths, especially those associated with isoscalar pairing, are not usually specified alongside Skyrme particlehole effective interactions.…”

Section: Introductionmentioning

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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“…The terms η = 7, 8 include the spin-orbit contributions of the force. In this work we carried out calculations with four Gogny-like interactions: the D1M force [31], the more traditional D1S [32] parametrization, and also with other two forces, D1MT2c and D1ST2c [22], which we built by adding tensor terms to the two basic parametrizations.…”

Section: Details Of the Calculationsmentioning

confidence: 99%

“…With this HF+CRPA model, we have carried out calculations for the 12 C, 16 O, 22 O, 24 O, 40 Ca, 48 Ca, 56 Ni, and 68 Ni. In these nuclei the hole s.p.…”

Section: Details Of the Calculationsmentioning

confidence: 99%

Self-consistent continuum random-phase approximation with finite-range interactions for charge-exchange excitations

et al. 2016

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The formalism of the continuum random-phase approximation theory which treats, without approximations, the continuum part of the single-particle spectrum, is extended to describe chargeexchange excitations. Our approach is self-consistent, meaning that we use a unique, finite-range, interaction in the Hartree-Fock calculations which generate the single-particle basis and in the continuum random-phase approximation which describes the excitation. We study excitations induced by the Fermi, Gamow-Teller and spin-dipole operators in doubly magic nuclei by using four Gognylike finite-range interactions, two of them containing tensor forces. We focus our attention on the importance of the correct treatment of the continuum configuration space and on the effects of the tensor terms of the force.

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Charge-exchange excitations with finite-range interactions including tensor terms

Cited by 10 publications

References 59 publications

Nuclear response functions with finite-range Gogny force: Tensor terms and instabilities

Nuclear response functions with finite-range Gogny force: Tensor terms and instabilities

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

Self-consistent continuum random-phase approximation with finite-range interactions for charge-exchange excitations

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