Near-threshold behavior of positronium-antiproton scattering
Using the convergent close-coupling theory we study the threshold behavior of cross sections for positronium (Ps) of energy E scattering on antiprotons. In the case of Ps(1s) elastic scattering, simple power laws are observed for all partial waves studied. The partial-wave summed cross section is ne...
| Main Authors: | , , , |
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| Format: | Journal Article |
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American Physical Society
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/32693 |
| _version_ | 1848753734066110464 |
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| author | Fabrikant, I. Bray, A. Kadyrov, Alisher Bray, I. |
| author_facet | Fabrikant, I. Bray, A. Kadyrov, Alisher Bray, I. |
| author_sort | Fabrikant, I. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Using the convergent close-coupling theory we study the threshold behavior of cross sections for positronium (Ps) of energy E scattering on antiprotons. In the case of Ps(1s) elastic scattering, simple power laws are observed for all partial waves studied. The partial-wave summed cross section is nearly constant, and dominates the antihydrogen formation cross section at all considered energies, even though the latter is exothermic and behaves as 1/E1/2. For Ps(2s), oscillations spanning orders of magnitude on top of the 1/E behavior are found in the elastic and quasielastic cross sections. The antihydrogen formation is influenced by dipole-supported resonances below the threshold of inelastic processes. Resonance energies form a geometric progression relative to the threshold. The exothermic antihydrogen formation cross sections behave as 1/E at low energies, but are oscillation free. We demonstrate that all these rich features are reproduced by the threshold theory developed by Gailitis. |
| first_indexed | 2025-11-14T08:29:13Z |
| format | Journal Article |
| id | curtin-20.500.11937-32693 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:29:13Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-326932018-03-29T09:08:25Z Near-threshold behavior of positronium-antiproton scattering Fabrikant, I. Bray, A. Kadyrov, Alisher Bray, I. Using the convergent close-coupling theory we study the threshold behavior of cross sections for positronium (Ps) of energy E scattering on antiprotons. In the case of Ps(1s) elastic scattering, simple power laws are observed for all partial waves studied. The partial-wave summed cross section is nearly constant, and dominates the antihydrogen formation cross section at all considered energies, even though the latter is exothermic and behaves as 1/E1/2. For Ps(2s), oscillations spanning orders of magnitude on top of the 1/E behavior are found in the elastic and quasielastic cross sections. The antihydrogen formation is influenced by dipole-supported resonances below the threshold of inelastic processes. Resonance energies form a geometric progression relative to the threshold. The exothermic antihydrogen formation cross sections behave as 1/E at low energies, but are oscillation free. We demonstrate that all these rich features are reproduced by the threshold theory developed by Gailitis. 2016 Journal Article http://hdl.handle.net/20.500.11937/32693 10.1103/PhysRevA.94.012701 American Physical Society restricted |
| spellingShingle | Fabrikant, I. Bray, A. Kadyrov, Alisher Bray, I. Near-threshold behavior of positronium-antiproton scattering |
| title | Near-threshold behavior of positronium-antiproton scattering |
| title_full | Near-threshold behavior of positronium-antiproton scattering |
| title_fullStr | Near-threshold behavior of positronium-antiproton scattering |
| title_full_unstemmed | Near-threshold behavior of positronium-antiproton scattering |
| title_short | Near-threshold behavior of positronium-antiproton scattering |
| title_sort | near-threshold behavior of positronium-antiproton scattering |
| url | http://hdl.handle.net/20.500.11937/32693 |