Angular correlations of positron annihilation radiations in Mg are measured. The observed angular correlations are interpreted in terms of the independent particle model (IPM). The observed crystalline anisotropies and fine structures of the angular correlations are explained very well by the IPM. However, the overall shapes of the angular correlations are not well explained in terms of the IPM alone. By introducing empirical enhancement factors the disagreement is greatly reduced.
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Shiotani et al. (1981) studied this question.
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