Theoretical calculations of positron annihilation with rare-gas core electrons in simple and transition metals

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Abstract
Positron-annihilation rates, momentum densities of positron-annihilation pairs, and electron-positron enhancement factors for rare-gas core electrons in 27 frequently investigated metals are calculated. The sensitivity of these quantities to various parameters of electron and positron models applied—namely, to the electron-electron exchange and correlation potential, electron configuration, lattice dimensions, and the shape of positron wave function, as well as the size of relativistic effects—is studied. The influence of inclusion of electron-positron correlations into both electron and positron wave functions on resulting annihilation characteristics is discussed. It is shown that the present approach reproduces fairly well also the total positron-annihilation rates and positron lifetimes.