Hannover 2010 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: Poster

MS 8.5: Poster

Donnerstag, 11. März 2010, 16:00–18:00, Lichthof

Detection System for a 3H/3He Mass-Ratio measurement — •Jochen Ketter1, Christoph Diehl1, Martin Höcker1, David B. Pinegar1, Sebastian Streubel1, Robert S. Van Dyck Jr.2, and Klaus Blaum11Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Deutschland — 2Department of Physics, University of Washington, Seattle, WA 98195-1560, USA

More precise knowledge of the Q-value of the β-decay of 3H to 3He will complement the determination of the electron antineutrino’s mass by the Karlsruhe Tritium Neutrino Experiment (KATRIN) [1]. In order to improve the presently accepted Q-value [2] by a factor of 25 to an uncertainty of 50 meV, the mass ratio of 3H to 3He has to be measured with an uncertainty of less than 10−11. Penning trap mass spectrometry has the prospect of doing so. To this end, a double Penning trap mass spectrometer [3], originally developed and built at the University of Washington, has been commissioned in a dedicated laboratory in Heidelberg. The mass measurement relies on the determination of the ion’s three eigenfrequencies in the trap. While a frequency-locked loop keeps the ion’s axial frequency in resonance with a tuned circuit, the other two frequencies are determined via shifts induced in the axial frequency due to higher-order couplings when sweeping through resonances. Details of the detection system will be given.

[1] E. W. Otten et al., Int. J. Mass Spectrom. 251 (2006) 173–178

[2] Sz. Nagy et al., Europhys. Lett., 74 (3), pp. 404–410 (2006)

[3] D. B. Pinegar et al., Hyperfine Interactions (2007) 174:47–53

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