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Convergent close coupling calculations for positron-magnesium scattering

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Authors
Savage, J.
Bray, Igor
Fursa, Dmitry
Kadyrov, Alisher
Lugovskoy, Andrey
Utamuratov, R.
Date
2012
Type
Conference Paper

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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.
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Journal of Physics: Conference Series
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Department of Physics and Astronomy
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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.