SENSITIVITY OF ELECTRON-POSITRON MOMENTUM DENSITIES TO THE POSITRON WAVE FUNCTION: THEORETICAL AND NUMERICAL RESULTS

H. Sormann1, G. Kontrym-Sznajd2

1 Institut fuer Kernphysik, Technische Universitaet Graz, Petersgasse 16, A-8010 Graz, Austria,
2 W. Trzebiatowski Institute of Low Temperature and Structural Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wroclaw 2, Poland

In this paper, we study how the electron-positron momentum density of non-interacting particles, r(p), in a periodic lattice potential is influenced by changes of the shape of the positron wave function y+(r). For this purpose, we confront the results of a recently published theory with data obtained by numerical tests. This confrontation confirms and illustrates the validity of all main statements of our theory.