Journal article

Authors list: Brandau, C.; Fuchs, S.; Hannen, V.; Hanu, E. O.; Krantz, C.; Lestinsky, M.; Looshorn, M.; Menz, E. B.; Wang, S. X.; Schippers, S.

Publication year: 2025

Journal: Chinese Physics C

Volume number: 49

Issue number: 6

ISSN: 1674-1137

eISSN: 2058-6132

DOI Link: https://doi.org/10.1088/1674-1137/adbf81

Publisher: IOP Publishing

Abstract: 
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 Facility for Antiproton and Ion Research (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 strong field quantum electrodynamics tests through 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 associated data-analysis procedures along with first results for nonresonant and resonant recombination of berylliumlike lead ions. A recombination rate enhancement factor of 3.5 was observed for nonresonant recombination at zero electron-ion collision energy. For resonant recombination excellent agreement with recent theoretical results was obtained when these were shifted by 340 meV in energy.

Harvard Citation style: Brandau, C., Fuchs, S., Hannen, V., Hanu, E., Krantz, C., Lestinsky, M., et al. (2025) Electron-ion collision spectroscopy at the CRYRING@ESR electron cooler, Chinese Physics C, 49(6), Article 064001. https://doi.org/10.1088/1674-1137/adbf81

APA Citation style: Brandau, C., Fuchs, S., Hannen, V., Hanu, E., Krantz, C., Lestinsky, M., Looshorn, M., Menz, E., Wang, S., & Schippers, S. (2025). Electron-ion collision spectroscopy at the CRYRING@ESR electron cooler. Chinese Physics C. 49(6), Article 064001. https://doi.org/10.1088/1674-1137/adbf81