Abstract
The convergent close-coupling method is used to obtain cross sections for antihydrogen formation in low-energy antiproton collisions with positronium (Ps) atoms in specified initial excited states with principal quantum numbers ni ≤ 5. The threshold behaviour as a function of the Ps kinetic energy, E, is consistent with the 1/E law expected from threshold theory for all initial states. We find that the increase in the cross sections is muted above ni = 3 and that here their scaling is roughly consistent with \({n_{i}^{2}}\), rather than the classically expected increase as \({n_{i}^{4}}\).
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The Australian Research Council, the EPSRC (UK) and the US National Science Foundation (via grant No. PHY-1401788) are thanked for their support.
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This article is part of the Topical Collection on Proceedings of the 13th International Conference on Low Energy Antiproton Physics (LEAP 2018) Paris, France, 12-16 March 2018
Edited by Paul Indelicato, Dirk van der Werf and Yves Sacquin
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Kadyrov, A.S., Rawlins, C.M., Charlton, M. et al. Antihydrogen formation in low-energy antiproton collisions with excited-state positronium atoms. Hyperfine Interact 239, 42 (2018). https://doi.org/10.1007/s10751-018-1519-x
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DOI: https://doi.org/10.1007/s10751-018-1519-x