Electron momentum density of hexagonal zinc studied by Compton scattering

We have measured the directional Compton profiles of a single crystal of hexagonal zinc along the [001], [100], [110] and [111] directions using high-energy (662 keV) gamma radiation from a exp 137 Cs isotope source. The experimental data have been compared with the corresponding theoretical Korringa-Kohn-Rostoker semi-relativistic calculations. The theory slightly overestimates the electron momentum densities at low momenta regions for all measured profiles. The directional difference profiles, both experimental and theoretical, show very small anisotropy of the electron momentum density in hexagonal zinc, at most half of that presented in the literature for cubic systems.