Heidelberg 2015 – wissenschaftliches Programm
A 13.5: Vortrag
Dienstag, 24. März 2015, 12:15–12:30, M/HS1
A high-precision measurement of the isotope effect in the magnetic moment of highly charged 40,48Ca17+ ions — •Jiamin Hou1, Florian Köhler1,2, Sven Sturm1, Anke Wagner1, Wolfgang Quint2, Günter Werth3, and Klaus Blaum1 — 1MPIK, Heidelberg, Germany — 2GSI, Darmstadt, Germany — 3JGU, Mainz, Germany
To achieve a comprehensive understanding of the fundamental properties of nature, high-precision experiments with trapped charged particles are one of the most promising methods. In this experiment, the magnetic moments, i.e. g-factors, of the bound electrons for lithium-like 40Ca and 48Ca ions in the medium Z region (Z=20) have been measured for the first time with a relative uncertainty of 7·10−10, giving rise to a stringent test of the isotope effect. We determine the bound-state electron magnetic moment by measuring the ratio of the electron spin-precession frequency and the ion’s cyclotron frequency1,2 in a cryogenic Penning-trap apparatus. The final result is obtained by combining our results with state-of-the-art QED calculations and an independent Penning-trap mass measurement. In the next step, hydrogen-like 40,48Ca19+ will be studied. The comparison with the lithium-like system allows us to separate nuclear and inter-electronic effects. Furthermore, a novel trap system is under development which will push the achievable precision into the 10−12 regime and thus will open new possibilities for the determination of fundamental constants.
 A.Wagner et al. Phys. Rev. Lett. 110, 033003 (2013)
 S. Sturm et al. Phys. Rev. Lett. 107, 023002(2011)