4
1. 11. 1982.
Perturbation theory of inelastic resonances
Perturbation theory of inelastic resonances is developed. From the fact that the resonances appear as the roots of the Jost function, we show that perturbation coefficients are obtained without use of the complete set. The theory is generalized to the case when the unperturbed Hamiltonian is p‐fold degenerate. The near degenerate case is also discussed, and the radius of convergence for the perturbation series is estimated. We also treat the perturbation theory of residues both in the nondegenerate and degenerate case.