Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Astroparticle Physics II

HK 61.1: Gruppenbericht

Freitag, 3. April 2020, 11:00–11:30, J-HS L

Measurement of weak couplings in neutron beta decay — •Bastian Märkisch1, Hartmut Abele2, Dirk Dubbers3, Holger Mest3, Michael Klopf2, Alexander Petoukhov4, Christoph Roick1, Heiko Saul1, Torsten Soldner4, Xiangzun Wang2, and Dominik Werder31Physik-Department, Technische Universität München, Germany — 2Technische Universität Wien, Atominstitut, Austria — 3Physikalisches Institut, Universität Heidelberg, Germany — 4Institut Laue-Langevin, Grenoble, France

We present the most precise determination of the nucleon axial coupling from a measurement of the beta asymmetry in the decay of polarized neutrons. The instrument Perkeo III was installed at the PF1b beamline at the Institut Laue-Langevin, Grenoble, France. Leading sources of systematic error are eliminated or controlled by using a pulsed cold neutron beam. This measurement confirms previous results by Perkeo II and UCNA with improved precision. From it we determinate the CKM matrix element Vud, and derive constraints on tensor interactions and a best limit on the Fierz interference term b from neutron decay. We conclude by presenting the status of the follow-up facility PERC at the FRM II, Garching.

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DPG-Physik > DPG-Verhandlungen > 2020 > Bonn