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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Fundamental Symmetries I
HK 13.2: Gruppenbericht
Montag, 18. März 2019, 17:00–17:30, HS 16
Precision Measurement of the Beta Asymmetry in Neutron Beta Decay with Perkeo III — •Heiko Saul1, Hartmut Abele2, Dirk Dubbers3, Michael Klopf2, Bastian Märkisch1, Holger Mest3, Alexandr Pethoukov4, Christoph Roick1, Torsten Soldner4, Xiangzun Wang2, and Dominik Werder3 — 1Physik Department ENE, Technische Universität München — 2Atominsititut, Technische Universität Wien — 3Physikalisches Institut, Universität Heidelberg — 4Institut Laue-Langevin, Grenoble
Within the standard model of particle physics semi-leptonic weak decay is described by only two free parameters, the ratio of vector and axial vector couplings, λ, and the first element of the CKM-matrix Vud. Due to the absence of nuclear structure, neutron beta decay is an ideal probe to test the structure of the weak interaction.
Measuring the beta asymmetry, A, is the most precise way of measuring λ. The spectral shape of the experimental beta asymmetry furthermore contains information about hypothetical scalar- and tensor interactions via the Fierz interference term.
In this talk we present the result of the world‘s most precise measurement of the beta asymmetry performed with the decay spectrometer Perkeo III. This measurement has been carried out at the PF1B cold neutron beam facility at the Institut Laue-Langevin.