Effects of the Tensor Force on the Multipole Response in Finite Nuclei

TL;DR

This paper investigates how the tensor force influences the multipole response of finite nuclei, revealing its significant impact on magnetic dipole states and providing insights for refining tensor force parameters.

Contribution

It offers a comprehensive analysis of tensor interaction effects on nuclear multipole responses using a self-consistent RPA model with Skyrme interactions, highlighting differences across response types.

Findings

Tensor force significantly affects magnetic dipole states.

Larger impact of tensor force observed at the mean field level.

Discussion on improving tensor force parameter assessment.

Abstract

We present a thorough analysis of the effects of the tensor interaction on the multipole response of magic nuclei, using the fully self-consistent Random Phase Approximation (RPA) model with Skyrme interactions. We disentangle the modifications to the static mean field induced by the tensor terms, and the specific features of the residual particle-hole (p-h) tensor interaction, for quadrupole (2+), octupole (3-), and also magnetic dipole (1+) responses. It is pointed out that the tensor force has a larger effect on the magnetic dipole states than on the natural parity states 2+ and 3-, especially at the mean field level. Perspectives for a better assessment of the tensor force parameters are eventually discussed.