Low-energy l-mixing collisions of excited positronium with protons and antiprotons
We investigate l-mixing processes in collisions of excited positronium (Ps) atoms with protons in the range of the principal quantum number n of the Ps atom between 4 and 8. We show first that results of the threshold theory agree very well with convergent close-coupling calculations. We then compar...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Institute of Physics Publishing Ltd.
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/54848 |
| _version_ | 1848759477800534016 |
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| author | Fabrikant, I. Kadyrov, Alisher Bray, Igor Charlton, M. |
| author_facet | Fabrikant, I. Kadyrov, Alisher Bray, Igor Charlton, M. |
| author_sort | Fabrikant, I. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We investigate l-mixing processes in collisions of excited positronium (Ps) atoms with protons in the range of the principal quantum number n of the Ps atom between 4 and 8. We show first that results of the threshold theory agree very well with convergent close-coupling calculations. We then compare quantum cross sections with results of semiclassical and classical theories. In the semiclassical theory, the Ps atom is treated quantum-mechanically, whereas the relative Ps-p motion is described classically. For l-mixing processes there is a good agreement between quantum and semiclassical results, whereas classical theory strongly underestimates the l-mixing cross sections. The conclusions are important for the interpretation of Classical Trajectory Monte Carlo simulations and the use of their data in the design of experiments. |
| first_indexed | 2025-11-14T10:00:31Z |
| format | Journal Article |
| id | curtin-20.500.11937-54848 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:00:31Z |
| publishDate | 2017 |
| publisher | Institute of Physics Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-548482018-03-01T05:27:52Z Low-energy l-mixing collisions of excited positronium with protons and antiprotons Fabrikant, I. Kadyrov, Alisher Bray, Igor Charlton, M. We investigate l-mixing processes in collisions of excited positronium (Ps) atoms with protons in the range of the principal quantum number n of the Ps atom between 4 and 8. We show first that results of the threshold theory agree very well with convergent close-coupling calculations. We then compare quantum cross sections with results of semiclassical and classical theories. In the semiclassical theory, the Ps atom is treated quantum-mechanically, whereas the relative Ps-p motion is described classically. For l-mixing processes there is a good agreement between quantum and semiclassical results, whereas classical theory strongly underestimates the l-mixing cross sections. The conclusions are important for the interpretation of Classical Trajectory Monte Carlo simulations and the use of their data in the design of experiments. 2017 Journal Article http://hdl.handle.net/20.500.11937/54848 10.1088/1361-6455/aa743c Institute of Physics Publishing Ltd. restricted |
| spellingShingle | Fabrikant, I. Kadyrov, Alisher Bray, Igor Charlton, M. Low-energy l-mixing collisions of excited positronium with protons and antiprotons |
| title | Low-energy l-mixing collisions of excited positronium with protons and antiprotons |
| title_full | Low-energy l-mixing collisions of excited positronium with protons and antiprotons |
| title_fullStr | Low-energy l-mixing collisions of excited positronium with protons and antiprotons |
| title_full_unstemmed | Low-energy l-mixing collisions of excited positronium with protons and antiprotons |
| title_short | Low-energy l-mixing collisions of excited positronium with protons and antiprotons |
| title_sort | low-energy l-mixing collisions of excited positronium with protons and antiprotons |
| url | http://hdl.handle.net/20.500.11937/54848 |