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HK: Fachverband Hadronen und Kerne

HK 51: Fundamental Symmetries

HK 51.6: Vortrag

Mittwoch, 18. März 2009, 15:30–15:45, H-ZO 70

A Precision Measurement of the Hyperfine Structure of Antiprotonic Helium — •Thomas Pask¹, Daniel Barna², Andreas Dax², Sussane Friedreich¹, Ryugo Hayano², Masaki Hori³, Dezso Horvath^4,5, Bertalan Juhasz¹, Johann Marton¹, Oswald Massiczek¹, Naoya Ono², Anna Soter^3,4, Eberhard Widmann¹, and Johann Zmeskal¹ — ¹Stefan-Meyer-Institut für subatomare Physik Boltzmanngasse 3, 1090 Vienna, Austria — ²Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan — ³Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany — ⁴Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen,PO Box 51, Hungary. — ⁵Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen,PO Box 51, Hungary.

A precise measurement of the Antiprotonic helium hyperfine structure has been completed.

Due to its long life time this unique particle provides an ideal subject to test three-body Quantum Electrodynamic (QED) calculations and CPT theory. The new results yield a factor of 10 improvement over our previous measurements and, through comparison with theory, can be used to determine a new value for the spin magnetic moment of the antiproton.