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Four theoretical approaches to calculate momentum densities ofelectron-positron annihilation pairs (MDAP) in crystalline solids areconfronted with 3D densities reconstructed from two-dimensional angularcorrelation (2D-ACAR) data for copper, chromium, and yttrium. It is shown thatthe Bloch-modified ladder theory, in contrast to other approaches, is able todescribe - at least qualitatively - the MDAP profiles for all metalsinvestigated.

On the Reliability of Various Enhancement Theories for a Description of Electron-Positron Densities in Metals