Neutron pairing with medium polarization beyond the Landau approximation

摘要

We reexamine the longstanding problem of the superfluid transition temperature T-c in dilute neutron matter. It is well known that T-c is strongly affected by medium polarization effects (screening), which modify the pairing interaction in the medium. We study these effects within the random-phase approximation (RPA). It turns out that the widely used Landau approximation is sufficient only at densities below about 0.002 fm(-3). At higher densities, the full RPA leads to stronger screening than the Landau approximation.