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The Kohn variational method is used with a configuration-interaction ͑CI͒-type wave function to determine the phase shifts and Z eff for positron-copper scattering. The method is first tested for positron-hydrogen scattering and it is found to give phase shifts and Z eff within 1-2% of the best previous calculations. Although the phase shift for Cu converged more slowly with L max ͑the maximum angular momentum of the electron and positron orbitals included in the short-range basis͒, it wasdoi:10.1103/physreva.67.062709 fatcat:qwzvmrjhfbab7os5liea5d4yvu