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
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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