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

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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.