| Issue |
EPJ Web Conf.
Volume 219, 2019
International Workshop on Particle Physics at Neutron Sources (PPNS 2018)
|
|
|---|---|---|
| Article Number | 04005 | |
| Number of page(s) | 6 | |
| Section | Studies of Neutron Beta Decay | |
| DOI | https://doi.org/10.1051/epjconf/201921904005 | |
| Published online | 12 December 2019 | |
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
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