Global nuclear structure effects of tensor interaction

TL;DR

This paper investigates how strong attractive tensor interactions and weak spin-orbit fields influence nuclear structure, including binding energies, magic numbers, and deformation, revealing tensor-driven effects near nuclear drip lines.

Contribution

It demonstrates the impact of tensor interactions on nuclear magic numbers, stability, and deformation, highlighting new tensor-force driven phenomena in nuclear physics.

Findings

Tensor fields create magic numbers at N(Z)=14, 32, 56, 90.

Tensor effects influence nuclear stability near drip lines.

Possible new deformation effects driven by tensor forces.

Abstract

A direct fit of the isoscalar spin-orbit (SO) and both isoscalar and isovector tensor coupling constants to the f5/2-f7/2 SO splittings in 40Ca, 56Ni, and 48Ca nuclei requires a drastic reduction of the isoscalar SO strength and strong attractive tensor coupling constants. The aim of this work is to address further consequences of these strong attractive tensor and weak SO fields on binding energies, nuclear deformability, and high-spin states. In particular, we show that contribution to the nuclear binding energy due to the tensor field shows generic magic structure with tensorial magic numbers at N(Z)=14, 32, 56, or 90 corresponding to the maximum spin-asymmetries in 1d5/2, 1f7/2-2p3/2, 1g9/2-2d5/2 and 1h11/2-2f7/2 single-particle configurations and that these numbers are smeared out by pairing correlations and deformation effects. We also examine the consequences of strong attractive tensor fields and weak SO interaction on nuclear stability at the drip lines, in particular close to the tensorial doubly magic nuclei and discuss the possibility of an entirely new tensor-force driven deformation effect.