BCS-BEC crossover in symmetric nuclear matter at finite temperature: Pairing fluctuation and pseudogap

Journal Article · Mon Mar 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.034007· OSTI ID:21386667

Xuguang, Huang ^[1]

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1. Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main (Germany)

By adopting a T-matrix-based method within the G{sub 0}G approximation for the pair susceptibility, we studied the effects of pairing fluctuation on the BCS-BEC crossover in symmetric nuclear matter. The pairing fluctuation induces a pseudogap in the excitation spectrum of a nucleon in both superfluid and normal phases. The critical temperature of the superfluid transition was calculated. It differs from the BCS result remarkably when density is low. We also computed the specific heat, which shows a nearly ideal BEC-type temperature dependence at low density, but a BCS-type behavior at high density. This qualitative change of the temperature dependence of specific heat may serve as a thermodynamic signal for the BCS-BEC crossover.

• OSTI ID: 21386667
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 81; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
APPROXIMATIONS
BARYONS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
CALCULATION METHODS
CRITICAL TEMPERATURE
DENSITY
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
FLUCTUATIONS
HADRONS
MATRICES
MATTER
NUCLEAR MATTER
NUCLEONS
PHYSICAL PROPERTIES
S MATRIX
SIMULATION
SPECIFIC HEAT
SPECTRA
SUPERFLUIDITY
SYMMETRY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VARIATIONS