The Brueckner reaction matrix for the $A=18\mathrm{}$ nuclei is obtained in an accurate fashion from a nonlocal separable potential of the Tabakin type, but possessing a much stronger repulsive core. This potential, as well as those of Tabakin and Yamaguchi, is used in comparative studies of the reaction matrix. Both harmonic-oscillator and plane-wave intermediate states are employed. The results are compared extensively to the work by other authors on the local Hamada-Johnston potential. In the plane-wave treatment, the effect of replacing the kinetic-energy operator by a form (suggested by Baranger) more compatible with the exclusion principle is estimated.

• Received 13 February 1969

DOI:https://doi.org/10.1103/PhysRev.185.1378