Electron-positron interaction in metals: momentum dependence of HMC and ionic core enhancement factors

Abstract

The momentum dependence of an effective enhancement factor is investigated both for itinerant and core electrons. The local density approach is applied to describe electron-positron interaction. The possibility of over-enhancement of HMC is predicted for the first time. The results obtained for core electrons are consistent with experimental data. It is shown that for some momenta electron-positron attraction can give not only enhancement, but also damping of the probability annihilation.