Abstract
A new experimental method for unveiling the strong hyperfine interactions of multi-electron ion configurations is described. It consists in observing atomic spin precessions of nuclear-excited ions recoiling through vacuum in weak external transverse magnetic fields. Due to the strong hyperfine coupling the nuclear orientation follows the atomic precession, resulting in a rotation of the angular correlation of decayγ-rays. The method is illustrated using the long-lived 197keV19F (5/2+) state as probe. The observed large precessions as well as the strong attenuations of theγ-angular correlations are well accounted for by considering all possible configurations resulting from the coupling ofL-shell electrons in the relevant ionic charge states.
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We would like to thank Dr. A. Zemel (Weizmann Institute, Rehovot) for many helpful discussions in the derivation of the angular correlation functions. We also thank Mrs. A. Meens and F. Kuntz (CRN, Strasbourg) for preparing the targets and constructing the target chamber, respectively.
One of us (P.N.T.) is indebted to the Alexander von Humboldt-Foundation and the CRN Strasbourg for their kind hospitality.
This work was supported in part by the Deutsche Forschungsgemeinschaft and the Bundesminsterium für Forschung und Technologie.
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Knopp, M., Mertens, V., Hagelberg, F. et al. Atomic spin precessions of fluorine ions recoiling through vacuum in weak transverse magnetic fields. Z Physik A 320, 635–643 (1985). https://doi.org/10.1007/BF01411864
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DOI: https://doi.org/10.1007/BF01411864