BCS-BEC crossover and thermodynamics in asymmetric nuclear matter with pairings in isospin I=0 and I=1 channels

Journal Article · Sun Mar 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.034304· OSTI ID:21199608

Shijun, Mao; Pengfei, Zhuang ^[1]; Xuguang, Huang ^[1]

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1. Physics Department, Tsinghua University, Beijing 100084 (China)

The Bardeen/Cooper/Schrieffer-Bose-Einstein condensation (BCS-BEC) crossover and phase diagram for asymmetric nuclear superfluid with pairings in isospin I=0 and I=1 channels are investigated at the mean-field level by using a density-dependent nucleon-nucleon potential. Induced by the in-medium nucleon mass and density-dependent coupling constants, neutron-proton Cooper pairs could be in BEC state at sufficiently low density, but there is no chance for the BEC formation of neutron-neutron and proton-proton pairs at any density and asymmetry. We calculate the phase diagram in asymmetry-temperature plane for weakly interacting nuclear superfluid and find that including the I=1 channel changes significantly the phase structure at low temperature. There appears a new phase with both I=0 and I=1 pairings at low temperature and low asymmetry, and the gapless state in any phase with I=1 pairing is washed out and all excited nucleons are fully gapped.

• OSTI ID: 21199608
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
BCS THEORY
BOSE-EINSTEIN CONDENSATION
COOPER PAIRS
COUPLING CONSTANTS
DENSITY
ISOSPIN
MASS
MEAN-FIELD THEORY
NEUTRONS
NUCLEAR MATTER
NUCLEON-NUCLEON POTENTIAL
PHASE DIAGRAMS
PROTONS
SIMULATION
SUPERFLUIDITY
THERMODYNAMICS