Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Fundamental Symmetries I

HK 24.1: Gruppenbericht

Dienstag, 28. März 2017, 14:00–14:30, F 073

Precision Measurement of the Beta Asymmetry in Neutron Beta Decay with Perkeo III — •Heiko Saul1,2, Hartmut Abele2, Dirk Dubbers3, Bastian Märkisch1, Alexandr Pethukov4, Christoph Roick1, Ulrich Schmidt3, Torsten Soldner4, Xiangzun Wang2, and Dominik Werder31Physik Department, TU München — 2Atominstitut, TU Wien — 3Physikalisches Institut, Universität Heidelberg — 4Institut Laue-Langevin, Grenoble

Neutron beta decay is described accurately within the standard model of particle physics using the first CKM-matrix element, Vud, and the ratio of vector and axial vector couplings, λ, as parameters. Angular correlations, spectra and the neutron lifetime are accessible experimentally, providing an excellent toolkit for investigating the structure of weak interaction.

Measuring the Beta Asymmetry, A, is the most precise way of determining λ, which is an important standard model parameter and necessary for the determination of Vud from Neutron Decay. Moreover it allows to derive limits on non-standard model couplings by combining with measurements of other correlation coefficients.

In this talk we present the most precise measurement of the Beta Asymmetry performed with the decay spectrometer Perkeo III carried out at the PF1B cold neutron beam facility at the Institut Laue-Langevin. We discuss the result and its implications.

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