Compton scattering study of the electron momentum density for bismuth single crystal

Directional Compton profiles of single crystals of bismuth, Bi[100]. Bi[110 ] and Bi[111] have been measured with high accuracy for the first time usin g 662 keV gamma-radiation from a Cs-137 isotope source. Korringa-Kohn-Rosto ker (KKR) semi-relativistic calculations were performed to calculate the th eoretical electron momentum density distributions along the three main crys tallographic directions. The calculated and measured Compton profiles agree very well in periodicity of the oscillatory character of directional Compt on anisotropies whereas the predicted amplitude of the oscillations is twic e that measured in the experiment.