Convergent close coupling calculations for positron-magnesium scattering

Savage, J. and Bray, I. and Fursa, D. and Kadyrov, A. and Lugovskoy, A. and Utamuratov, R. 2012. Convergent close coupling calculations for positron-magnesium scattering, in Proceedings of the XXVII International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC), Jul 27- Aug 2 2011, Volume 388, Part 8: Article ID 072007. Belfast, Northern Ireland: IOP.

Source Title

Journal of Physics: Conference Series

DOI

10.1088/1742-6596/388/7/072007

ISSN

1742-6588

School

Department of Physics and Astronomy

URI

http://hdl.handle.net/20.500.11937/8205

Collection

Curtin Research Publications

Abstract

While a two-centre convergent close-coupling approach to positron-magnesium scattering is developed, a single-centre method has been used to calculate total cross sections up to incident energies of 100 eV. The results agree very well with the measurements of Stein et al. [1] for positron energies above the ionisation threshold (7.6 eV). Similar accuracy is expected for energies below the positronium formation threshold (0.8 eV) where presently there are no experimental data to compare to. In this energy region we find a large p-wave resonance at 0.17 eV. Similar resonance behaviour was found in calculations by Mitroy and Bromley [2] at an energy of 0.1 eV.