Reevaluations of the total K-shell cross sections of single-quantum annihilation of positrons have been made by taking into account the L-shell contribution. Z dependence of the cross section was studied for five high-Z elements, Z=50,73,79,82,and 92, and for 300-keV positrons. Energy dependence has also been investigated for the last two elements in the energy region of 250-400 keV. Comparisons with theoretical predictions including the screening effect are also made.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics