Abstract
Experiments are reported which measure the angular correlation of gamma rays from positron annihilation in solid and liquid mercury, solid and liquid bismuth and a liquid bismuth-mercury alloy. The positron wave functions and the angular correlations to be expected from positrons annihilating in the ion cores are calculated in the single-electron approximation. It is not possible to use these calculations to subtract core annihilation from the total observed annihilation because the shapes of the theoretical and experimental curves do not agree at large angles. This situation is discussed. Valence electron annihilation is shown to be more probable relative to core annihilation in the liquids than in the solids, and for liquid bismuth it is compared with theoretical calculations by Ballentine.
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