Transition from BCS pairing to Bose-Einstein condensation in low-density asymmetric nuclear matter

Details Transition from BCS pairing to Bose-Einstein condensation in low-density asymmetric nuclear matter Transition from BCS pairing to Bose-Einstein condensation in low-density asymmetric nuclear matter

2001-09-10

arxiv.org/abs/nucl-th/0109024v1

Phys.Rev. C64 (2001) 064314

Physics

Nuclear Physics

Nuclear Theory

17 pages, uncluding 7 figures, PRC in press

Scientific paper

10.1103/PhysRevC.64.064314

We study the isospin-singlet neutron-proton pairing in bulk nuclear matter as a function of density and isospin asymmetry within the BCS formalism. In the high-density, weak-coupling regime the neutron-proton paired state is strongly suppressed by a minor neutron excess. As the system is diluted, the BCS state with large, overlapping Cooper pairs evolves smoothly into a Bose-Einstein condensate of tightly bound neutron-proton pairs (deuterons). In the resulting low-density system a neutron excess is ineffective in quenching the pair correlations because of the large spatial separation of the deuterons and neutrons. As a result, the Bose-Einstein condensation of deuterons is weakly affected by an additional gas of free neutrons even at very large asymmetries.

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