On a Theory of Superfluidity of Asymmetric Nuclear Matter
  Influence of asymmetry on superfluidity of nuclear matter with triplet-singlet pairing of nucleons (in spin and isospin spaces) is considered within the framework of a Fermi-liquid theory. Solutions of self-consistent equations for the critical temperature and the energy gap at T=0 are obtained. It is shown, that the backward influence of pairing correlations through the normal distribution functions of nucleons leads to the qualitative change: instead of two-valued behavior the energy gap has universal one-valued behavior. At T=0 superfluidity arises as a result of a first order phase transition in density. 
A. I. Akhiezer, A. A. Isayev, S. V. Peletminsky, A. A. Yatsenko