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Possible resonance in positron-lithium scattering.

The possible appearance of resonances in the partial cross sections of the inelastic collisions of positrons with lithium atoms at energies below 5 eV is investigated. It is assumed that only elastic and rearrangement channels are open, while excitation channels are closed. A coupled static formalism, in which the polarization potentials of the lithium and positronium are switched on, is employed. The basis set of Clementi and Roetti (At. Data Nucl. Data Tables 14, 177 (1974)) is used for describing the target model. Comparison between the resulting total cross sections and those obtained by other authors is presented.