Surface behaviour of the pairing gap in semi-infinite nuclear matter

The 1S0-pairing gap in semi-infinite nuclear matter is evaluated microscopically using the effective pairing interaction recently derived in the coordinate representation from a separable form of the Paris NN-potential. Instead of a direct iterative solution of the gap equation, a new method proposed by V. A. Khodel, V. V. Khodel and J. W. Clark was used which simplifies the procedure significantly. The gap Δ obtained in our calculations exhibits a strong variation in the surface region with a pronounced maximum near the surface.