Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-04-12
JETP Lett.82:551-556,2005; Pisma Zh.Eksp.Teor.Fiz.82:627-632,2005
Physics
Nuclear Physics
Nuclear Theory
Prepared with RevTeX4, 5p., 4 figures
Scientific paper
10.1134/1.2161279
The density, spin and isospin correlation functions in nuclear matter with a neutron-proton ($np$) condensate are calculated to study the possible signatures of the BEC-BCS crossover in the low-density region. It is shown that the criterion of the crossover (Phys. Rev. Lett. {\bf 95}, 090402 (2005)), consisting in the change of the sign of the density correlation function at low momentum transfer, fails to describe correctly the density-driven BEC-BCS transition at finite isospin asymmetry or finite temperature. As an unambiguous signature of the BEC-BCS transition, there can be used the presence (BCS regime) or absence (BEC regime) of the singularity in the momentum distribution of the quasiparticle density of states.
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