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- W2071691572 abstract "The influence of the positron distribution and electron-positron interactions on the momentum density ensuremath{rho}(p) of annihilation quanta in real metals is discussed on mathematical grounds. We show that in simple metals, neither the assumed form of the positron wave function nor state-independent electron-positron correlations can change appreciably the shape of ensuremath{rho}(p) inside the central Fermi surface. The role of momentum dependence of two-particle correlations is set forth. For localized electronic populations, this property does not occur: both the form of the positron distribution and the locality of correlation effects have a crucial influence on the resulting momentum density ensuremath{rho}(p). The same features have the umklapp components for delocalized electrons." @default.
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- W2071691572 date "1993-03-15" @default.
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- W2071691572 title "Interpretation of positron-annihilation data with respect to the electron-positron enhancement factors. I. Theory" @default.
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- W2071691572 doi "https://doi.org/10.1103/physrevb.47.6950" @default.
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