Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 61: Astroparticle Physics II
HK 61.2: Talk
Friday, April 3, 2020, 11:30–11:45, J-HS L
Measurement of the Fierz interference term with PERKEO III — •Max Lamparth1, Karina Bernert1, Hartmut Abele3, Andreas Doblhammer3, Erwin Jericha3, Jens Klenke4, Annabel Kropf1, Kathrin Lehmann4, Martin Losekamm1, Heiko Saul1, Ulrich Schmidt5, Torsten Soldner2, Lukas Werner1, and Bastian Märkisch1 — 1TUM Physik-Department, Garching b. München, Deutschland — 2Institut Laue-Langevin, Grenoble, Frankreich — 3Atominstitut Wien, Wien, Östereich — 4FRM, Garching b. München, Deutschland — 5Physikalisches Institut Universität Heidelberg, Heidelberg, Deutschland
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.