Magnetic excitations in nuclei with neutron excess

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

doi:10.1103/physrevc.85.034323

Cited by 21 publications

(24 citation statements)

References 48 publications

(111 reference statements)

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“…Since calcium isotopes are spin-saturated in protons, the like-nucleon tensor term does not act on protons, and the neutron-proton contribution is not active in the evolution of the neutron gap. The consequences of this in the excitation of magnetic states in calcium isotopes have been widely discussed in [37]. only on the tensor-isospin dependent term and, therefore, changes both the like-nucleon and unlike components of the tensor force.…”

Section: Neutron N = 28 Energy Gap In Calcium Isotopesmentioning

confidence: 99%

Tensor and tensor-isospin terms in the effective Gogny interaction

et al. 2012

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We discuss the need of including tensor terms in the effective Gogny interaction used in meanfield calculations. We show in one illustrative case that, with the usual tensor term that is employed in the Skyrme interaction (and that allows us to separate the like-nucleon and the neutron-proton tensor contributions), we can describe the evolution of the N = 28 neutron gap in calcium isotopes.We propose to include a tensor and a tensor-isospin term in finite-range interactions of Gogny type. The parameters of the two tensor terms allow us to treat separately the like-nucleon and the neutron-proton contributions. Two parameterizations of the tensor terms have been chosen to reproduce different neutron single-particle properties in the 48 Ca nucleus and the energy of the first 0 − state in the 16 O nucleus. By employing these two parameterizations we analyze the evolution of the N = 14, 28, and 90 neutron energy gaps in oxygen, calcium and tin isotopes, respectively.We show that the combination of the parameters governing the like-nucleon contribution is crucial to correctly reproduce the experimental (where available) or shell-model trends for the evolution of the three neutron gaps under study.

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Section: Neutron N = 28 Energy Gap In Calcium Isotopesmentioning

confidence: 99%

Tensor and tensor-isospin terms in the effective Gogny interaction

et al. 2012

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“…A lot of works recently aimed to determine the most reliable tensor term built-in effective interaction. It is now clear that the tensor term modifies the single particle energies [16] and the binding energies [17], the multipoles giant resonances [18,19] and even may affect the magic numbers and the spin-orbit splitting in some cases [20].…”

Section: Introductionmentioning

confidence: 99%

Interplay between tensor force and deformation in even–even nuclei

Bernard

Anguiano

2016

Nuclear Physics A

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In this work we study the effect of the nuclear tensor force on properties related with deformation. We focus on isotopes in the Mg, Si, S, Ar, Sr and Zr chains within the Hartree-Fock-Bogoliubov theory using the D1ST2a Gogny interaction. Contributions to the tensor energy in terms of saturated and unsaturated subshells are analyzed. Like-particle and proton-neutron parts of the tensor term are independently examinated. We found that the tensor term may considerably modify the potential energy landscapes and change the ground state shape. We analyze too how the pairing characteristics of the ground state change when the tensor force is included.

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“…We have presented in Ref. [35] a detailed discussion of the M1 strength distribution in oxygen and calcium isotopes.…”

Section: Resultsmentioning

confidence: 99%

Electric quadrupole and magnetic dipole moments of odd nuclei near the magic ones in a self-consistent approach

et al. 2015

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We present a model which describes the properties of odd-even nuclei with one nucleon more, or less, with respect to the magic number. In addition to the effects related to the unpaired nucleon, we consider those produced by the excitation of the closed shell core. By using a single particle basis generated with Hartree-Fock calculations, we describe the polarization of the doubly magic-core with Random Phase Approximation collective wave functions. In every step of the calculation, and for all the nuclei considered, we use the same finite-range nucleon-nucleon interaction. We apply our model to the evaluation of electric quadrupole and magnetic dipole moments of odd-even nuclei around oxygen, calcium, zirconium, tin and lead isotopes. Our Random Phase Approximation description of the polarization of the core improves the agreement with experimental data with respect to the predictions of the independent particle model. We compare our results with those obtained in first-order perturbation theory, with those produced by Hartree-Fock-Bogolioubov calculations and with those generated within the Landau-Migdal theory of finite Fermi systems. The results of our universal, self-consistent, and parameter free approach have the same quality of those obtained with phenomenological approaches where the various terms of the nucleon-nucleon interaction are adapted to reproduce some specific experimental data. A critical discussion on the validity of the model is presented.

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Magnetic excitations in nuclei with neutron excess

Cited by 21 publications

References 48 publications

Tensor and tensor-isospin terms in the effective Gogny interaction

Tensor and tensor-isospin terms in the effective Gogny interaction

Interplay between tensor force and deformation in even–even nuclei

Electric quadrupole and magnetic dipole moments of odd nuclei near the magic ones in a self-consistent approach

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