Polarization Effects Accompanying Positron Annihilation in Metals

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Abstract
The experimental data available concerning positron annihilation in metals are shown to be consistent with a positron-electron interaction which is the instantaneous limit of the Hubbard effective potential neglecting exchange. This is shown to reduce to a screened Coulomb potential with an expontential cutoff almost twice as large as the usual plasma cutoff. The data also suggest that the effect of electron-electron interactions upon the momentum distribution is smaller than previous calculations indicate.