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Low-energy positron interactions with xenon

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Authors
Machacek, J.
Makochekanwa, C.
Jones, A.
Caradonna, P.
Slaughter, D.
McEachran, R.
Sullivan, J.
Buckman, S.
Bellm, S.
Lohmann, B.
Fursa, Dmitry
Bray, Igor
Mueller, D.
Stauffer, A.
Date
2011
Type
Journal Article

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Citation
Machacek, J.R. and Makochekanwa, C. and Jones, A.C.L. and Caradonna, P. and Slaughter, D.S. and McEachran, R.P. and Sullivan, J.P. and Buckman, S.J. and Bellm, S. and Lohmann, B. and Fursa, D.V. and Bray, I. and Mueller, D.W. and Stauffer, A.D. 2011. Low-energy positron interactions with xenon. New Journal of Physics. 13 (12): pp. 1-19.
Source Title
New Journal of Physics
DOI
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Department of Imaging and Applied Physics
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Abstract

Low-energy interactions of positrons with xenon have been studied both experimentally and theoretically. The experimental measurements were carried out using a trap-based positron beam with an energy resolution of ~80 meV, while the theoretical calculations were carried out using the convergent close-coupling method and the relativistic optical potential approach. Absolute values of the grand total, positronium formation and grand total minus positronium formation cross sections are presented over the energy range of 1–60 eV. Elastic differential cross sections (DCS), for selected energies, are also presented both below and above the positronium formation threshold. Fine energy-step measurements of the positronium formation cross section over the energy range of 4.4–8.4 eV, and measurements of the elastic DCS at the energies of 5.33 and 6.64 eV, have been carried out to investigate the ionization threshold regions corresponding to the 2P3/2 and 2P1/2 states of the Xe+ ion. The present results are compared with both experimental and theoretical values from the literature where available.