Dresden 2011 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 3: Poster
MS 3.6: Poster
Montag, 14. März 2011, 16:00–18:00, P1
Detection System for a 3H/3He Mass-Ratio Measurement — •Jochen Ketter1, Christoph Diehl1, Martin Höcker1, David B. Pinegar1, Sebastian Streubel1, Marius Tremer1, Robert S. Van Dyck Jr.2, and Klaus Blaum1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Department of Physics, University of Washington, Seattle, WA 98195-1560, USA
The maximum energy release in the beta-decay of 3H to 3He is a crucial parameter in the determination of the electron antineutrino’s mass by the Karlsruhe Tritium Neutrino Experiment (KATRIN) [1]. An independent measurement of this Q-value with an uncertainty of less than 100 meV would serve as an important systematic check, but an improvement of the presently accepted Q-value [2] by an order of magnitude is necessary. Even for Penning trap mass spectrometry, which derives the mass difference of the two nuclei from the measurement of their mass ratio, this represents an ambitious goal only to be accomplished by a dedicated experiment, such as THe-Trap. The double Penning trap mass spectrometer [3], originally developed and built at the University of Washington, has been commissioned in a customized laboratory at the MPIK in Heidelberg. The mass of the ion is related to its three eigenfrequencies in the trap. A frequency-locked loop in the axial mode provides for continuous indirect monitoring of the radial modes. 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