Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Fundamentale Symmetrien

HK 9.6: Vortrag

Montag, 17. März 2014, 18:15–18:30, HZ 3

Current status of aSPECT — •Alexander Wunderle for the aSPECT collaboration — Johannes Gutenberg-Universität, Mainz

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

In spring/summer 2013 aSPECT had a successful beamtime at the Institut Laue-Langevin in Grenoble (France). The goal of this run is to improve the current uncertainty of a from Δ a/a ≈ 5 % to about 1 %. To achieve this goal the systematics have to be understood accordingly. This is achieved on the one hand with different configurations during the beamtime (like different beam profiles or electrode settings), which is possible, as a statistical sensitivity of 1 % was reached within a few days. On the other hand the spectrometer and its systematics are precisely characterised with work function measurements of the electrodes and the experimental determination of the magnetic field ratio of the MAC-E filter. Furthermore, simulations of the field distribution and the particle transport in the spectrometer are used to quantify and reduce the systematic uncertainties of the measurements further.

In this talk we will present an overview of the systematics of aSPECT and their investigations.

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