Localization of nonlocal potentials by a Taylor expansion method

The Taylor expansion procedure introduced by Apagyi and Scheid (1983 J. Phy s. G: Nucl. Phys. 9 73) for localization of nonlocal potentials has been re -examined and improved to include third-order corrections. The method has b een applied to the real part of the nonlocal potential describing n-Ca-40 s cattering. Comparison with exact results and investigation of phase shifts show that inclusion of second-order correction terms may be sufficient to o btain a quick assessment of the local space effect of the underlying nonloc al potential.