München 2019 – wissenschaftliches Programm

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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 V_ud. 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.