Positron annihilation in the liquid alkali metals

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Abstract
Positron annihilation in the liquid alkali metals at just above their melting points is theoretically studied. A perturbation approach based on NFE model is used. The positron and electron momentum distributions including only the ionic density correlation have been selfconsistently calculated within a complex energy approximation. The positron resolution functions including both the ionic correlation and coulombic interactions have also been calculated by taking the simplest self energy diagram in the combined perturbation expansion into consideration. The angular correlation curves for liquid Na agrees well with the corresponding experimental curve over the full range of momentum within the error limits but there are still some appreciable deviations between them for liquid Rb.