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Three‐dimensional momentum density reconstructed from positron annihilation measurements of Si single crystals in comparison with compton effect results
Author(s) -
Dlubek G.,
Brümmer O.,
Gerber W.
Publication year - 1978
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19780130718
Subject(s) - physics , momentum (technical analysis) , annihilation , positron , positron annihilation , electron , annihilation radiation , angular momentum , atomic physics , nuclear physics , compton scattering , quantum mechanics , finance , economics
The three‐dimensional electron‐positron pair momentum density ϱ ep ( p ) is reconstructed with the help of the M IJNARENDS '‐analysis using angular correlation curves of 2γ‐positron annihilation‐radiation measured with p z parallel to the [100], [110], and [111] direction of a Si single crystal. ϱ ep ( p ) is compared with the electron momentum density ϱ e ( p ) and ϱ e ( p ) which are calculated on the basis of the independent particle model. These momentum densities are taken from the literature. It is shown that the most important differences between the experimental momentum densities ϱ ep ( p ) and ϱ e ( p ) can be reproduced by the calculation on the basis of the independent particle model. Some experiences concerning the handling of experimental data and accuracy of reconstructed momentum densities are reported.