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Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Fundamental Symmetries

HK 26.4: Talk

Tuesday, March 15, 2016, 17:30–17:45, S1/01 A02

Measurement of the Proton Asymmetry with PERKEO III - First Results — •Lukas Raffelt1,2, Christoph Roick1, Michael Klopf3, Heiko Saul3, 5, Wilfried Mach3, Daniel Moser3, 4, Hartmut Abele3, Gertrud Konrad3, 6, Bastian Märkisch1, Ulrich Schmidt2, and Torsten Soldner41Technische Universität München, Garching — 2Physikalisches Institut, Heidelberg — 3Atominstitut, Wien — 4Institut Laue-Langevin, Grenoble, Frankreich — 5FRM-II, Garching — 6SMI, ÖAW, Wien

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.

In our last beamtime in 2014/15 we measured the proton asymmetry C with the instrument PERKEO III at the ILL (Grenoble). 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.

The new spectrometer with an improved detector concept and operation with a pulsed beam allows for an in depth analysis of systematic effects. Electrons and protons from the decay were measured in a combined detector. The protons are converted to secondary electrons using thin foils at high voltage.

This talk will present first results of the ongoing data analysis with focus on the systematic effects of the proton detection.

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