Photorecombination studies of highly charged ions at the storage ring ESR: a progress report

In this contribution, we report on photorecombination measurements of highly charged ions (HCI) that were performed using the electron cooler of the heavy-ion storage ring ESR of the Gesellschaft für Schwerionenforschung (GSI) as a target of free electrons. The experimental technique of resonance re...

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Bibliographic Details
Published in:Journal of physics. Conference series 2007-03, Vol.58 (1), p.81-86
Main Authors: Brandau, C, Kozhuharov, C, Müller, A, Beckert, K, Beller, P, Bernhardt, D, Bosch, F, Böhm, S, Currell, F J, Gumberidze, A, Harman, Z, Jacobi, J, Mokler, P H, Nolden, F, Reuschl, R, Schippers, S, Schmidt, E W, Spillmann, U, Stachura, Z, Steck, M, Stöhlker, Th, Wolf, A
Format: Article
Language:English
Subjects:
Atomic collisions
Coolers
Direct reduction
Free electrons
Heavy ions
Ion beams
Ion storage
Ions
Neodymium
Nuclei (nuclear physics)
Physics
Resonance
Storage rings (particle accelerators)
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Summary:In this contribution, we report on photorecombination measurements of highly charged ions (HCI) that were performed using the electron cooler of the heavy-ion storage ring ESR of the Gesellschaft für Schwerionenforschung (GSI) as a target of free electrons. The experimental technique of resonance reaction spectroscopy by means of dielectronic recombination (DR) was employed in two new ways: The determination of isotope shifts in the DR resonance spectrum of few-electron heavy ions is a novel method with unique properties for investigations at the interface between electrons and the atomic nucleus, e.g., charge radii and hyperfine effects. First results from a pilot experiment with the two isotopes A 142 and A 150 of Li-like neodymium ANd57+ are discussed. Until very recently, electron-ion collision experiments at high relative energies of more than a few keV were not accessible at the electron coolers of storage rings. Such high energies are needed to access DR processes that involve the K-shell electrons of very heavy ions. The novel approach of DR measurements with a stochastically (pre-)cooled ion beam resolves this problem. Results for the photorecombination of hydrogen-like U91+ in the energy range (63 keV - 74 keV) of the KLL-DR process are presented.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/58/1/012