Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 64: Fundamental Symmetries I

HK 64.3: Talk

Thursday, March 31, 2022, 14:45–15:00, HK-H9

Electron Spectroscopy with PERC — •Karina Bernert¹, Jens Klenke², Max Lamparth¹, Manuel Lebert², Kathrin Lehmann², and Bastian Märkisch¹ — ¹Technische Universität München, Garching, Germany — ²Forschungsreaktor München, Garching, Germany

The PERC (Proton Electron Radiation Channel) instrument is a neutron decay facility currently being set up at the research reactor FRM II of the Heinz Maier-Leibnitz Zentrum in Garching. Its main component is a 12-meter long superconducting magnet system, which was recently delivered to the FRM II. We aim to measure several correlation coefficients in neutron beta decay one order of magnitude more precisely than currently possible. From the results, we will derive the nucleon axial coupling and the CKM matrix element V_ud and search for scalar and tensor couplings.
The spectrum of electrons from neutron decay will be obtained using two detector systems: the primary detector downstream will be a scintillation or silicon detector. The secondary detector system, used to identify backscattering events, consists of two pixelated scintillation detectors read out by silicon photomultipliers. In this talk, we present the status of the experiment and its main components with a focus on the backscatter detector.
PERC is developed in cooperation with scientists from TU Vienna, Universität Heidelberg, Johannes Gutenberg-Universität Mainz and the ILL.