Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 64: Fundamental Symmetries I
HK 64.2: Vortrag
Donnerstag, 31. März 2022, 14:30–14:45, HK-H9
Fierz interference term in neutron decay — •Max Lamparth1, Karina Bernert1, Hartmut Abele3, Andreas Doblhammer3, Erwin Jericha3, Jens Klenke2, Annabel Kropf1, Kathrin Lehmann2, Heiko Saul1, Ulrich Schmidt5, Torsten Soldner4, and Bastian Märkisch1 — 1TUM Physik-Department, Garching, Germany — 2Forschungsreaktor München, Garching, Germany — 3Atominstitut Wien, Wien, Austria — 4Institut Laue-Langevin, Grenoble, France — 5Physikalisches Institut Heidelberg, Heidelberg, Germany
Neutron beta decay is an excellent system to test the structure of the charged weak interaction. The Fierz interference term b is sensitive to hypothetical scalar and tensor interactions and absent in the Standard
Model. The signature of a non-zero Fierz term in neutron beta
decay is an extra energy-dependent phase-space contribution. Major systematic effects are hence related to the detector response: calibration, temporal stability, spatial uniformity and non-linearity effects.
The spectrometer PERKEO III was installed at the Institute
Laue-Langevin, Grenoble, France, with the aim to determine the Fierz interference term with a precision of 5 * 10−3 from the beta spectrum. We present the measurement and discuss the status of the analysis.