Berlin 2005 – wissenschaftliches Programm
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A: Atomphysik
A 3: Precision Spectroscopy of Atoms and Molecules I
A 3.6: Fachvortrag
Freitag, 4. März 2005, 15:45–16:00, HU 3075
Zemach and magnetic radius of the proton from the hyperfine splitting in hydrogen — •Andrei V. Volotka1,2, Vladimir M. Shabaev1,2, Günter Plunien2, and Gerhard Soff2 — 1St. Petersburg State University, Oulianovskaya 1, Petrodvorets, St. Petersburg 198504, Russia — 2Institut für Theoretische Physik, Technische Universität Dresden, Mommsenstraße 13, 01062 Dresden, Germany
The current status of the determination of corrections to the hyperfine splitting of the ground state in hydrogen is considered. Improved calculations are provided taking into account the most recent value for the proton charge radius. Comparing experimental data with predictions for the hyperfine splitting, the Zemach radius of the proton is deduced to be 1.045(16) fm. Employing exponential parametrizations for the electromagnetic form factors we determine the magnetic radius of the proton to be 0.778(29) fm. Both values are compared with the corresponding ones derived from the data obtained in electron-proton scattering experiments and the data extracted from a rescaled difference between hyperfine splittings in hydrogen and muonium.