Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 43: Poster session Particle Physics

T 43.14: Poster

Tuesday, March 31, 2020, 17:00–18:30, Grotte

A new Detector for Beta Spectroscopy with PERKEO III — •Karina Bernert, Matthias Antony, Max Lamparth, Martin Losekamm, Christoph Roick, Heiko Saul, and Bastian Märkisch — Physik Department, Technische Universität München, 85748 Garching b. München, Germany

Neutron beta decay provides an excellent toolkit for the investigation of the structure of the weak interaction and potential deviations from the predictions of the Standard Model of particle physics. Several times, the spectrometer PERKEO III has been used to perform measurements of neutron decay observables at the PF1B beamline at the Institut Laue-Langevin, Grenoble, most recently to measure the Fierz interference b. This term, which is zero within the Standard Model, offers a direct probe for scalar and tensor interactions. To reach the precision required for an improved limit, we developed a new Scintillation detector, which has nearly double the light output of that of previous detectors. The gain of the Photomultiplier tubes is monitored with light pulses from a Kapustinsky flasher, whose intensity is controlled with a Silicon Photomultiplier.