A. Rubaszeka, Z. Szotekb and W.M. Temmermanb
aW. Trzebiatowski Institute of Low Temperatures and Structure Research Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroc³aw 2, Poland
bDaresbury Laboratory, Daresbury, Warrington, WA4 4AD, Cheshire, UK
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Several approximations for the electron-positron interaction are applied to study the electron-positron momentum densities of paramagnetic chromium. The non-local and state selective electron-positron correlation functions, evaluated within the weighted density approximation, are used to calculate various positron annihilation characteristics in this system. The weighted density approximation results are compared to the experimental data, and to the corresponding results of the independent particle model, local density approximation, and generalised gradient approximation. Also, the semi-empirical results are used in gaining more physical insight and deriving final conclusions of this work.
DOI: 10.12693/APhysPolA.99.473
PACS numbers: 78.70.Bj, 71.10.-w, 71.60.+z