https://doi.org/10.1051/epjconf/201921904005
Undetected electron backscattering in Perkeo III
1 Physik-Department ENE, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
2 Atominstitut, Technische Universität Wien, Stadionallee 2, 1020 Wien, Austria
a e-mail: christoph.roick@tum.de
b e-mail: maerkisch@ph.tum.de
Published online: 12 December 2019
The beta asymmetry in neutron beta decay is used to determine the ratio of axial-vector coupling to vector coupling most precisely. In electron spectroscopy, backscattering of electrons from detectors can be a major source of systematic error. We present the determination of the correction for undetected backscattering for electron detection with the instrument Perkeo III. For the electron asymmetry, undetected backscattering leads to a fractional correction of 5 × 10−4, i.e. a change by 40% of the total systematic uncertainty.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
