Off-shell T-matrix elements for singular nucleon-nucleon interactions

In this note the problem of the determination of off shell T-matrix elements is treated by utilizing a method designed for nucleon-nucleon potentials with hard-core repulsion. Explicit results are given for the Hamada-Johnston potential, which is treated up to L=2. The procedure is divided into three parts; first, one transforms the Lippman Schwinger equation into an equivalent equation for the wave matrix. The second step deals with the hard-core problem using a standard method known from the nuclear-matter problem. Finally the T-matrix is obtained from the wave matrix Ω by performing a simple integration (T=vΩ)