Multi-gap superfluidity in nuclear matter

It is shown that under lowering density or temperature a nucleon Fermi supe rfluid can undergo a phase transition to a new superfluid state correspondi ng to superposition of states with singlet-tripler (ST) and triplet-singlet (TS) pairing of nucleons (in spin and isospin spaces). Such states arise a s a result of branching from one-gap solution of the self-consistent equati ons, describing ST pairing of nucleons. The density and temperature depende nce of the order parameters for new two-gap solutions is determined in the: model with Skyrme effective forces. (C) 1999 Published by Elsevier Science B.V. All rights reserved.