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MS: Fachverband Massenspektrometrie

MS 7: Poster

MS 7.2: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

An experiment for high-precision mass measurements of the proton and the neutron — •Sascha Rau¹, Fabian Heisse^1,2, Sven Junck³, Florian Köhler-Langes¹, Andreas Mooser⁴, Wolfgang Quint², 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

Protons and neutrons are the central building blocks of all nuclei. Measuring their properties, among others their atomic masses, is of continued interest for metrology and offers possibilities for precision tests.

We are presently setting up a new experiment consisting of a cryogenic Penning-trap system, which aims to measure m_p and m_n in atomic mass units with a relative uncertainty of δ m / m = 10⁻¹¹ or better. This precision is achieved by comparing the simultaneously measured cyclotron frequencies of a proton or a deuteron, respectively, with a ¹²C⁶⁺-ion utilizing a phase-sensitve measurement technique, thus cancelling magnetic field fluctuations. The current status of the experiment, experimental methods, as well as first results will be presented.