Frankfurt 2014 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Astroteilchenphysik
HK 28.4: Talk
Tuesday, March 18, 2014, 18:00–18:15, HZ 9
Preparing a Proton Asymmetry Measurement with PERKEO III — •Lukas Raffelt1, Peter Lennert1, Hartmut Abele2, Torsten Soldner3, Ulrich Schmidt1, Heiko Saul4, Christoph Roick1, and Bastian Märkisch1 — 1Physikalisches Institut, Heidelberg, Deutschland — 2Atominstitut, Wien, Österreich — 3Institut Laue-Langevin, Grenoble, Frankreich — 4Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM-II), Garching, Deutschland
Precision measurements of angular correlation coefficients in neutron beta decay allow tests of the Standard Model and a determination of the ratio of coupling constants λ = gA / gV of the weak interaction.
We plan to measure the proton asymmetry C with the instrument PERKEO III at the ILL (Grenoble) in 2014. This will provide a crosscheck of other measurements of several neutron decay correlation coefficients and might be sensitive to contributions of scalar and tensor interactions. Currently the only precision measurement of the proton asymmetry has been performed in 2008 with PERKEO II. Using the new spectrometer in pulsed mode and utilizing the improved detector concept, we expect to increase the precision to approximately 0.25%.
Electrons and protons from the decay will be measured in a combined detector. The protons are converted to secondary electrons using a new high voltage system with thin foils. A scintillator with new lightguides and all-side readout will provide a homogeneous detection of the electrons.