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Konstanz 1998 – wissenschaftliches Programm

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A: Atomphysik

A 8: Spektroskopie II

A 8.5: Vortrag

Dienstag, 17. März 1998, 15:00–15:15, A701

Ground State Hyperfine Splitting of Hydrogen-like 207Pb81+ by Laser Excitation of a Bunched Ion Beam in the ESR — •P. Seelig1, S. Borneis2, A. Dax2, S. Farber2, M. Gerlach2, D. Marx2, W. Quint2, G. Huber1, T. K"uhl2, F. Schmitt2, H. Winter2, and M. W"urtz31Institut f"ur Physik, Universit"at Mainz — 2Gesellschaft f"ur Schwerionenforschung mbH, Darmstadt — 3Institut f"ur Angewandte Physik, Technische Universit"at Darmstadt

The measurement of the ground-state hyperfine-structure transition in heavy ions provides an outstanding test case for the electromagnetic interaction in a combination of strong electric and magnetic fields. Using a new bunched-beam technique in the GSI heavy-ion storage ring (ESR), we performed precision laser spectroscopy on relativistic heavy ions in the hitherto inaccessible infrared optical region . We determined the wavelength of the M1-transition between the F  = 1 (τ≈ 50 ms) and F  = 0 hyperfine states of the 1s ground state of hydrogen-like 207Pb81+. The measured value of 1019.7(2) nm is compared with the very recent theoretical predictions. A discrepancy of 5 nm is found. Because the nucleus of 207Pb81+ is well described by the single-particle shell model, uncertainties in corrections due to nuclear effects are expected to be small. As a result, these uncertainties are a less persuasive explanation of the disagreement between experiment and theory than was the case for measurements of the hydrogen-like 209Bi82+.
I. Klaft et al., Phys. Rev. Lett. 73, 2425 (1994)

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