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A: Atomphysik
A 21: Poster II
A 21.15: Poster
Donnerstag, 6. April 2000, 17:00–19:30, Aula
Investigations on the hyperfine structure of highly–charged hydrogen– and lithium–like ions — •M. Tomaselli1, S. Borneis2, A. Dax2, S. Fritzsche3, T. Kühl2, D. Marx2, F. Schmitt2, P. Seelig2, and H. Winter2 — 1Institut für Kernphysik, Universität Darmstadt, D–64289 Darmstadt — 2Gesellschaft für Schwerionenforschung, Planckstraße 1, D–62491 Darmstadt — 3Fachbereich Physik, Universität Kassel, Heinrich–Plett–Str. 40, D–34132 Kassel
The ground state hyperfine structure of high–Z ions is an interesting test case for QED in strong fields. The fact that the relevant interaction is concentrated very close to the nucleus makes it particularly sensitive to higher order contributions. In recent precision experiments at the GSI in Darmstadt on hydrogen–like ions [1], one found level splittings which could not (yet) fully be reproduced by theory [2]. For instance, several measurements have been carried out for hydrogen–like 209Bi82+ and 207Pb81+ ions and yielded splittings of 5.0840(5) eV and 1.2159(2) eV while the values of detailed calculations are, including QED, 5.056(9) eV and 1.2101(26) eV, and 5.083(8) eV and 1.2166(20) eV without QED. In a recent attempt to measure the ground state hyperfine transition for lithium–like bismuth, also no signal was found within the range of a theoretical prediction. — In this contribution we discuss multi–particle effects contributing to the nuclear corrections in hydrogen–like systems, and to QED and electron correlations in the lithium–like case.
[1] P. Seelig et al., Phys. Rev. Lett. 81, 4824 (1998).
[2] M. Tomaselli, T. Kühl, P. Seelig, C. Holbrow und E. Kankeleit, Phys. Rev. C58, 1524 (1998).