Microscopic calculation of a pairing gap in semi-infinite nuclear matter

The pairing gap in semi-infinite nuclear matter has been calculated microsc opically by solving the gap equation for a nonlocal interaction with the ai d of the method proposed by V.A. Khodel, A.V. Khodel, and J.W. Clark [Nucl. Phys. A 598, 390 (1996)] for the case of infinite nuclear matter. The calc ulation employs the effective pairing interaction obtained previously for s emi-infinite geometry on the basis of the separable 3 x 3 representation of the Paris nucleon-nucleon potential. The gap found in this way changes sha rply in the surface region, where it has a pronounced maximum. The dependen ce of the surface effect on the chemical potential of nuclear matter has be en investigated. (C) 2000 MAIK "Nauka/Interperiodica".