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Remeasurement of the magnetic moment of the antiproton |
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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. Institut für Kernphysik and Universit?t, Institut für Experimentelle Kernphysik, Kernforschungszentrum Karlsruhe, D-7500, Karlsruhe, Germany 6. Institute for Physics, University of Basel, CH-4056, Basel, Switzerland 7. Research Institute of Physics, S-11346, Stockholm, Sweden 8. Centre de Recherches Nucléaires, F-67037, Strasbourg Cedex, France 9. Department of Nuclear Physics, University of Thessaloniki, GR-54006, Thessaloniki, Greece 10. Physik Department, Technische Universit?t München, D-8000, München, Germany 12. Physics Department, University of Mississippi, University, Mississipi, USA |
| Abstract: | A high-precision measurement of the finestructure splitting in the circular 11→10 X-ray transition of \(\bar p^{208} Pb\) was performed. The experimental value of 1199(5) eV is in agreement with QED calculations. From that value the magnetic moment of the antiproton was deduced to be ?2.8005(90)μ nucl. With this result the uncertainty of the previous world average value was reduced by a factor of ≈2. A comparison with the corresponding quantity of the proton now yields: \({{\left( {\mu _p - \left| {\left\langle {\mu _{\bar p} } \right\rangle } \right|} \right)} \mathord{\left/ {\vphantom {{\left( {\mu _p - \left| {\left\langle {\mu _{\bar p} } \right\rangle } \right|} \right)} {\mu _p }}} \right. \kern-0em} {\mu _p }} = \left( { - 2.4 \pm 2.9} \right) \times 10^{ - 3} \) . |
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