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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Fundamental Symmetries

HK 26.1: Gruppenbericht

Dienstag, 15. März 2016, 16:30–17:00, S1/01 A02

The aSPECT experiment - an overview and latest results — •Alexander Wunderle for the aSPECT collaboration — Johannes Gutenberg-Universität Mainz

The aSPECT retardation spectrometer measures the β−ν angular correlation coefficient a in free neutron β-decay. This measurement can be used to determine the ratio g_A/g_V of the weak coupling constants, as well as to search for physics beyond the Standard Model.

In spring/summer 2013 aSPECT had a successful beam time at the Institut Laue-Langevin. The goal of this beam time is to improve the current uncertainty of a from Δ a/a∼ 5% to about 1%. The data analysis is in its final stage and will be finished soon. In order to achieve an uncertainty of 1%, the systematics of aSPECT have to be understood accordingly. This understanding is obtained from systematic tests and measurements of a with different parameter settings for the spectrometer during the beam time. Additionally, offline measurements have been performed to determine the effect on the systematics, e.g. work-function fluctuations of the electrodes, the magnetic field ratio of the spectrometer and detailed tests of the detector electronics. These measurements are used as input for sophisticated simulations of the spectrometer to understand and reduce the systematic uncertainties further.

In this talk we will present an overview of aSPECT and its measuring principle. The beam time 2013 will be presented in detail, including the current status of the data analysis and preliminary results for systematic effects and their uncertainties.