On the Neutron-Proton Interaction

Rarita, William; Schwinger, Julian

doi:10.1103/physrev.59.436

Cited by 170 publications

(42 citation statements)

References 15 publications

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“…In general, some of TIJ interactions give equally good or somewhat better agreement with experimental data than SLy4. Especially T22, T44 and T26 give satisfactory results, but the T62 parametrization in which tensor acts only between protons and neutrons in spherical symmetry shows an artificial enhancement of J (2) in very high-spin states, and does not give a satisfactory description of experimental observations. Concerning the tensor contributions, the time-even contribution to J (2) for T44 is small and varies between −4% at low spin and 2% at high spin.…”

Section: Rotation and Tensor Coupling Constantsmentioning

confidence: 99%

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Tensor interaction in mean-field and density functional theory approaches to nuclear structure

Sagawa

Colò

2014

Progress in Particle and Nuclear Physics

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The importance of the tensor force for nuclear structure has been recognized long ago. Recently, the interest for this topic has been revived by the study of the evolution of nuclear properties far from the stability line. However, in the context of the effective theories that describe medium-heavy nuclei, the role of the tensor force is still debated. This review focuses on ground-state properties like masses and deformation, on single-particle states, and on excited vibrational and rotational modes. The goal is to assess which properties, if any, can bring clear signatures of the tensor force within the mean-field or density functional theory framework. It will be concluded that, while evidences for a clear neutron-proton tensor force exist despite quantitative uncertainties, the role of the tensor force among equal particles is less well established.

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Section: Rotation and Tensor Coupling Constantsmentioning

confidence: 99%

“…At the same time, the electric quadrupole moment of the deuteron is a signature of the pure tensor component. The introduction of the tensor force dates back to the early 1940s [1,2,3], not so long after the birth of nuclear physics (see also [4]). …”

Section: Introductionmentioning

confidence: 99%

Tensor interaction in mean-field and density functional theory approaches to nuclear structure

Sagawa

Colò

2014

Progress in Particle and Nuclear Physics

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“…The presence of an electric quadrupole moment in the ground state of the deuteron [1,2] can be explained by including static tensor terms in the microscopic nucleon-nucleon force as first suggested by Rarita et al [3][4][5]. This procedure is today commonly adopted by all the modern microscopic nucleon-nucleon interactions [6][7][8][9][10].…”

Section: Introductionmentioning

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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“…Like for deuteron [17], the equation (H − E)ψ = 0 for qq triplet state is equivalent to coupled system…”

Section: Breit−fermi Approachmentioning

confidence: 99%

Spin Effects in Two Quark System and Mixed States

et al. 2005

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Based on the numeric solution of a system of coupled channels for vector mesons ($S$- and $D$-waves mixing) and for tensor mesons ($P$- and $F$-waves mixing) mass spectrum and wave functions of a family of vector mesons $q\bar{q}$ in triplet states are obtained. The calculations are performed using a well known Cornell potential with a mixed Lorentz-structure of the confinement term. The spin-dependent part of the potential is taken from the Breit-Fermi approach. The effect of singular terms of potential is considered in the framework of the perturbation theory and by a configuration interaction approach (CIA), modified for a system of coupled equations. It is shown that even a small contribution of the $D$-wave to be very important at the calculation of certain characteristics of the meson states.Comment: 12 pages, LaTe

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On the Neutron-Proton Interaction

Cited by 170 publications

References 15 publications

Tensor interaction in mean-field and density functional theory approaches to nuclear structure

Tensor interaction in mean-field and density functional theory approaches to nuclear structure

Tensor and tensor-isospin terms in the effective Gogny interaction

Spin Effects in Two Quark System and Mixed States

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