Eur. Phys. J. A (2016) 52: 183
https://doi.org/10.1140/epja/i2016-16183-1

Regular Article - Theoretical Physics

Gogny interactions with tensor terms

¹ Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, E-18071, Granada, Spain
² Dipartimento di Matematica e Fisica “E. De Giorgi”, Università del Salento and INFN Sezione di Lecce, Via Arnesano, I-73100, Lecce, Italy
³ Dipartimento di Matematica e Fisica “E. De Giorgi”, Università del Salento, Via Arnesano, I-73100, Lecce, Italy
⁴ Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, F-91406, Orsay Cedex, France

^* e-mail: mangui@ugr.es

Received: 10 February 2016
Revised: 21 April 2016
Accepted: 4 May 2016
Published online: 1 July 2016

Abstract

We present a perturbative approach to include tensor terms in the Gogny interaction. We do not change the values of the usual parameterisations, with the only exception of the spin-orbit term, and we add tensor terms whose only free parameters are the strengths of the interactions. We identify observables sensitive to the presence of the tensor force in Hartree-Fock, Hartree-Fock-Bogoliubov and random phase approximation calculations. We show the need of including two tensor contributions, at least: a pure tensor term and a tensor-isospin term. We show results relevant for the inclusion of the tensor term for single-particle energies, charge-conserving magnetic excitations and Gamow-Teller excitations.