A METHOD FOR CALCULATING THE JOST FUNCTION FOR ANALYTIC POTENTIALS

A combination of the variable-constant and complex coordinate rotation methods is used to solve the two-body Schrodinger equation. The latte r is replaced by a system of linear first-order differential equations , which enables one to perform direct calculation of the Jest function for all complex momenta of physical interest, including the spectral points corresponding to bound and resonance states. Explicit forms of the equations, appropriate for central short-range and Coulomb-tailed potentials, are given. Within the proposed method, the scattering, bou nd, virtual, and resonance state problems can be treated in a unified way. The effectiveness of the method is demonstrated by a numerical ex ample.