S-WAVE PAIRING OF LAMBDA-HYPERONS IN DENSE MATTER

In this work we calculate the S-1(0) gap energies of Lambda hyperons i n neutron star matter. The calculation is based on a solution of the B CS gap equation for an effective G-matrix parametrization of the Lambd a-Lambda interaction with a nuclear matter background, presented recen tly by Lanskoy and Yamamoto. We find that a gap energy of a few tenths of a MeV is expected for Lambda Fermi momenta up to about 1.3 fm(-1). Implications for neutron star matter are examined, and suggest the ex istence of a Lambda S-1(0) superfluid between the threshold baryon den sity for Lambda formation and the baryon density where the Lambda frac tion reaches 15-20 %.