Regge-pole positions and residues calculated from phase-integral formulas

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Abstract
Regge-pole positions and residues associated with real and complex optical potentials of the Lennard-Jones type are calculated by phase-integral formulas. Two relevant transition zeros are taken into account; they may lie at an arbitrary distance from each other, while the origin and the other transition points are assumed to lie far away from the two relevant transition zeros. The calculations are performed up to the 13th order of the phase-integral approximation. The results obtained are much more accurate than results published earlier.