Abstract
The hyperspherical hidden-crossing method (HHCM) has been applied to s-, p-, and d-wave positronium formation in positron-lithium collisions in the energy range 0-1.8 eV, using a model potential to describe the atomic core. The calculations have provided a test of the HHCM. The s-, p-, and d-wave positronium formation cross sections are reported and compared with variational and close-coupling calculations. A minimum is obtained in the s-wave positronium formation cross section which is due to the Stuckelberg phase having a value of {pi}. The cross sections have also been computed including the correction term which emerges from the one-Sturmian theory.
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