Three-dimensional positron-electron momentum distribution in single-crystal graphite

Abstract
The three-dimensional positron-electron momentum distribution in single-crystal graphite is determined from the reconstruction of the measured two-dimensional angular correlation of positron annihilation. The Lock-Crisp-West rate obtained through periodic superposition of the experimentally determined momentum density is compared with the theoretical rate calculated on the basis of linear combination of atomic orbitals Xα by Saito et al.