Electron-ion collision spectroscopy at the CRYRING@ESR electron cooler
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915252929560576 |
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| author | Brandau, C. Fuchs, S. Hannen, V. Hanu, E. O. Krantz, C. Lestinsky, M. Looshorn, M. Menz, E. B. Wang, S. X. Schippers, S. |
| author_facet | Brandau, C. Fuchs, S. Hannen, V. Hanu, E. O. Krantz, C. Lestinsky, M. Looshorn, M. Menz, E. B. Wang, S. X. Schippers, S. |
| contents | Electron-ion collision spectroscopy at heavy-ion storage rings aims at precision measurements of resonance features that occur in the cross sections of electron collision processes such as electron-impact ionization of ions or electron-ion recombination. As part of the international FAIR project, the low-energy ion storage ring CRYRING@ESR has been coupled with the heavy-ion accelerators operated by the GSI Helmholtz Center for Heavy-Ion Research in Darmstadt, Germany. This has created a new opportunity for stringent tests of strong field quantum electrodynamics by electron-ion collision spectroscopy of heavy few-electron ions. The present contribution provides details of the electron-ion collision spectroscopy setup at CRYRING@ESR and of the associated data-analysis procedures along with first results for nonresonant and resonant recombination of berylliumlike lead ions. For nonresonant recombination a recombination rate enhancement factor of 3.5 is found at zero electron-ion collision energy. For resonant recombination there is excellent agreement with recent theoretical results when these are shifted by 340~meV in energy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_16918 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electron-ion collision spectroscopy at the CRYRING@ESR electron cooler Brandau, C. Fuchs, S. Hannen, V. Hanu, E. O. Krantz, C. Lestinsky, M. Looshorn, M. Menz, E. B. Wang, S. X. Schippers, S. Atomic Physics Electron-ion collision spectroscopy at heavy-ion storage rings aims at precision measurements of resonance features that occur in the cross sections of electron collision processes such as electron-impact ionization of ions or electron-ion recombination. As part of the international FAIR project, the low-energy ion storage ring CRYRING@ESR has been coupled with the heavy-ion accelerators operated by the GSI Helmholtz Center for Heavy-Ion Research in Darmstadt, Germany. This has created a new opportunity for stringent tests of strong field quantum electrodynamics by electron-ion collision spectroscopy of heavy few-electron ions. The present contribution provides details of the electron-ion collision spectroscopy setup at CRYRING@ESR and of the associated data-analysis procedures along with first results for nonresonant and resonant recombination of berylliumlike lead ions. For nonresonant recombination a recombination rate enhancement factor of 3.5 is found at zero electron-ion collision energy. For resonant recombination there is excellent agreement with recent theoretical results when these are shifted by 340~meV in energy. |
| title | Electron-ion collision spectroscopy at the CRYRING@ESR electron cooler |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2502.16918 |