Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 30: Hadronenstruktur und -spektroskopie
HK 30.5: Vortrag
Mittwoch, 19. März 2014, 17:45–18:00, HZ 1+2
Towards a Q-value measurement of tritium — •Marc Schuh1, Tommi Eronen1, Martin Höcker1, Jochen Ketter1, Sebastian Streubel1, 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-Trap is a precision Penning-trap mass spectrometer [1] at the Max-Planck-Institut für Kernphysik in Heidelberg. The main goal of the experiment is to measure the tritium/helium-3 mass ratio in order to deduce the Q-value of the tritium β-decay. The aimed accuracy of 10 parts per trillion (ppt) in the mass ratio would allow determining the Q-value with a precision of 30 meV, which would be a 40-fold improvement over the currently adopted value. An improved tritium Q-value is of relevance for the Karlsruhe Tritium Neutrino (KATRIN) collaboration, which is using a β-endpoint spectrometer to measure the antielectron neutrino mass. So far, our most precise measurement is the carbon-12/oxygen-16 mass ratio [2] with a modest relative precision of 120 ppt in early 2013. Further improvements will allow us to reach the desired 10 ppt precision in order to help solving one of the of the most exciting questions in physics — determining the neutrino mass.
[1] Ch. Diehl et al., Hyperfine Interact 199, 291-300 (2011)
[2] S. Streubel et al., Applied Physics B, DOI:10.1007/s00340-013-5669-x