Medium polarization in asymmetric nuclear matter

S. S. Zhang, L. G. Cao, U. Lombardo, and P. Schuck
Phys. Rev. C 93, 044329 – Published 25 April 2016

Abstract

The influence of the medium polarization on the effective nuclear interaction of asymmetric nuclear matter is calculated in the framework of the induced interaction theory. The strong isospin dependence of the density and spin-density fluctuations is studied as it is driven by the interplay between the neutron and proton medium polarizations. Going from symmetric nuclear matter to pure neutron matter, the crossover of the induced interaction from attractive to repulsive in the spin-singlet state is determined as a function of the isospin imbalance. The density range in which the crossover occurs is also determined. For the spin-triplet state the induced interaction turns out to be always repulsive. The implications of the results for neutron star superfluid phases are briefly discussed.

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  • Received 9 February 2016

DOI:https://doi.org/10.1103/PhysRevC.93.044329

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

S. S. Zhang1, L. G. Cao2,3, U. Lombardo4,*, and P. Schuck5,6

  • 1School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
  • 2School of Mathematics and Physics, North China Electric Power University, Beijing 102206, China
  • 3State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics (CAS), Beijing 100190, China
  • 4Dipartimento di Fisica e Astronomia dell'Universitá and Laboratori Nazionali del Sud (INFN), via S. Sofia 62, 95123 Catania, Italy
  • 5Institut de Physique Nucléaire, Université Paris-Sud, F-91406 Orsay Cedex, France
  • 6Laboratoire de Physique et de Modĺisation des Milieux Condensés, CNRS and Université Joseph Fourier, 25 Avenue des Martyrs, BP 166, F-38042 Grenoble, France

  • *Present address: Laboratori Nazionali del Sud (INFN), via S. Sofia 62, 95123 Catania, Italy; lombardo@lns.infn.it

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Issue

Vol. 93, Iss. 4 — April 2016

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