Rostock 2019 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 2: Precision Mass Spectrometry
MS 2.6: Vortrag
Montag, 11. März 2019, 15:30–15:45, U A-Esch 2
Towards parts per trillion mass measurements with LIONTRAP — •Sascha Rau1, Fabian Heisse1,2, Florian Köhler-Langes1, Wolfgang Quint2, Sven Sturm1, and Klaus Blaum1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2GSI-Helmholtzzentrum für Schwerionenforschung Darmstadt, Germany
A new ion trap setup termed as LIONTRAP (Light ION TRAP), dedicated to high-precision mass measurements of light ions, has been constructed at the University of Mainz.
We recently measured the proton’s atomic mass by comparing the cyclotron frequencies of a single proton and a bare carbon nucleus [1], achieving a relative mass uncertainty of 3.2× 10−11, a factor of three more precise than the CODATA value, and revealing a 3-sigma deviation with respect to this value. This, however, is not enough to explain recently discussed discrepancies in light ion mass measurements [2], the so-called “light ion mass puzzle” , which is of special interest since some of these mass values (3T and 3He) are used as important consistency check for the determination of the mass of the electron-antineutrino ν_e at KATRIN.
The status of the current measurement campaign striving for a precision of better than
1× 10−11 for the atomic mass of the deuteron together with previous results of LIONTRAP will be presented. In addition, a method to reduce the leading order magnetic field inhomogeneity, which was limiting the precision of the last measurement campaign, by more than 2 orders of magnitude, will be discussed.
F. Heiße et al., Phys. Rev. Lett. 119, 033001 (2017)
S. Hamzeloui et al., Phys. Rev. A 96, 060501 (2017)