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First direct observation of strong interaction spin-orbit effects in antiprotonic atoms |
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| Authors: | A Kreissl A D Hancock H Koch Th Köhler H Poth U Raich D Rohmann A Wolf L Tauscher A Nilsson M Suffert M Chardalas S Dedoussis H Daniel T von Egidy F J Hartmann W Kanert H Plendl G Schmidt J J Reidy |
| Institution: | 1. Kernforschungszentrum Karlsruhe, Institut für Kernphysik, Universit?t Karlsruhe, Germany 2. Institut für Experimentelle Kernphysik, Germany 7. Institut für Physik, Universit?t Basel, Switzerland 8. Research Institute of Physics, Stockholm, Sweden 9. Centre de Recherches Nucléaires, Strasbourg, France 10. Department of Nuclear Physics, University of Thessaloniki, Greece 11. Physik Department, Technische Universit?t München, Germany 13. Physics Department, University of Mississippi, USA |
| Abstract: | The strong ¯p-nucleus spin-orbit interaction was investigated in a measurement of the strong-interaction effects of the 9→8 transition in ¯p 174Yb at the Low-Energy Antiproton Ring (LEAR) at CERN. This measurement was part of an experimental programme where, for the first time, the fine-structure components of the last observable X-ray transition in a ¯p atom, which carries information on the strong ¯p-nucleus interaction, were resolved and studied individually. The observed splitting ΔE exp=2408±26 eV consists of the electromagnetic fine-structure splitting ΔE FS=2350 eV and an additional splitting Δ?=58±26 eV. In addition, one finds a significant difference in the level widths of Δ=195±59 eV with the larger value?=1216±41 eV for the lower fine-structure level. This experiment follows an earlier measurement on ¯p 138Ba, where the transition 8→7 is influenced by the strong interaction. In this case, however, the fine-structure components could not be resolved. The results for174Yb may be attributed to a spin-orbit (LS) term in the complex strong-interaction potential. |
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