Mainz 2017 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 1: Precision Mass Spectrometry and Fundamental Applications I
MS 1.3: Vortrag
Montag, 6. März 2017, 15:30–15:45, RW 2
A high-precision experiment for the determination of the atomic mass of the proton — •Fabian Heisse1,2, Sven Junck3, Florian Köhler-Langes1, Andreas Mooser4, Wolfgang Quint2, Sascha Rau1, Stefan Ulmer4, Günter Werth3, Klaus Blaum1, and Sven Sturm1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany — 2GSI-Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany — 3Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany — 4RIKEN Ulmer Initiative Research Unit, Saitama 351-0198, Japan
The proton, together with the electron and the neutron, form the central building blocks of the visible universe. The precise knowledge of its properties, among others its atomic mass, is of great interest for high-precision tests as well as for metrology.
We have started an experiment to determine the proton’s atomic mass mp to δmp/mp = 10−11 or better. The measurement principle is based on a simultaneous phase-sensitive comparison of the proton’s cyclotron frequency to that of a bare carbon nucleus (12C6+) in a Penning trap. A new cryogenic Penning-trap setup with a highly advanced magnetic shimming system has been built to achieve ultra stable measurement results.
The status of the experiment, such as the detection of single protons and carbon ions as well as the first results of the optimization of the seven-electrode cylindrical Penning trap, will be presented.