Compton Scattering and Various ACAR Experiments in Mg
G. Kontrym-Sznajd
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wrocław 2, Poland
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Electron-positron (e-p) momentum densities in Mg are studied using three different sets of angular correlation of annihilation radiation (ACAR) and Compton scattering experimental data. ACAR data, measured with almost identical resolution, give both a similar anisotropy of the Fermi surface and a similar e-p enhancement factor inside this surface. However, as concerns a contribution of Umklapp components of valence-electron densities there are essential differences depending on experimental data. Due to a strong dependence of such densities on different theoretical approaches describing e-p correlations, it is suggested to perform: additional, high statistics and resolution ACAR measurements for Mg and analyze them as suggested in the paper.

DOI: 10.12693/APhysPolA.125.696
PACS numbers: 13.60.Fz, 71.18.+y, 71.15.Mb, 71.20.-b, 78.70.Bj