Electron-positron correlations in paramagnetic chromium

Several approximations for the electron-positron interaction are applied to study the electron-positron momentum densities of paramagnetic chromium. T he non-local and state selective electron-positron correlation functions, e valuated within the weighted density approximation, are used to calculate v arious positron annihilation characteristics in this system. The weighted d ensity 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-empir ical results are used in gaining more physical insight and deriving final c onclusions of this work.