Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Precision spectroscopy of atoms and ions III (with Q)
A 15.4: Vortrag
Dienstag, 19. März 2013, 12:00–12:15, B 305
The proton g-factor — •Sascha A. Bräuninger1,3, Klaus Blaum1,3, Holger Kracke2,4, Clemens Leiteritz2, Andreas Mooser2,4, Wolfgang Quint3,5, Cricia Rodegheri1,2, Stefan Ulmer1,6, and Jochen Walz2,4 — 1Max-Planck-Institut für Kernphysik, D-69117 Heidelberg — 2Johannes Gutenberg-Universität, D-55099 Mainz — 3Ruprecht Karls-Universität, D-69047 Heidelberg — 4Helmholtz Institut, D-55099 Mainz — 5Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt — 6Riken Advanced Science Institut, Wako, Saitama 351-0198, Japan
The aim of our experiment is the first direct high-precision measurement of the g-factor of a single proton with a relative precision of 10−9 or better. The g-factor is determined by the ratio g=2νL/νc of the free cyclotron frequency νc and the Larmor frequency νL. νc is determined by the three eigenfrequencies of the trapped proton. νL is extractable by a measured probability distribution given by the number of induced spin transitions driven by an external field as a function of the excitation frequency. The continuous Stern-Gerlach effect is utilized to detect the induced spin transitions in a second Penning trap with an inhomogenous magnetic field. A change of the spin state due to an excitation of the magnetic dipole transition results in a change of the axial eigenfrequency. The status of the experiment and current developments with a measurement at the 10−6 level are presented.