Spinodal instabilities of spin-polarized asymmetric nuclear matter

Artur Polls and Isaac Vidaña
Phys. Rev. C 102, 054004 – Published 30 November 2020

Abstract

We analyze the spinodal instabilities of spin-polarized asymmetric nuclear matter at zero temperature for several configurations of the neutron and proton spins. The calculations are performed with the Brueckner-Hartree-Fock (BHF) approach using the Argonne V18 nucleon-nucleon potential plus a three-nucleon force of Urbana type. An analytical parametrization of the energy density, which reproduces with good accuracy the BHF results, is employed to determine the spinodal instability region. We find that, independently of the of the orientation of the neutron and proton spins, the spinodal instability region shrinks when the system is polarized, its size being smaller when neutron and proton spins are antiparallel than when they are oriented in a parallel way. We find also that the spinodal instability is always dominated by total density fluctuation independently of the degree of polarization of the system, and that restoration of the isospin symmetry in the liquid phase, i.e., the so-called isospin distillation or fragmentation effect, becomes less efficient with the polarization of the system.

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  • Received 14 July 2020
  • Accepted 16 October 2020

DOI:https://doi.org/10.1103/PhysRevC.102.054004

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Artur Polls1,2,* and Isaac Vidaña3

  • 1Departament de Física Quàntica i Astrofísica, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
  • 2Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
  • 3Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Dipartimento di Fisica “Ettore Majorana”, Università di Catania, Via Santa Sofia 64, I-95123 Catania, Italy

  • *Deceased.

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Issue

Vol. 102, Iss. 5 — November 2020

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