Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Astroteilchenphysik

HK 28.4: Vortrag

Dienstag, 18. März 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 = g_A / g_V 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.