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Limit on the Fierz Interference Term b from a Measurement of the Beta Asymmetry in Neutron Decay
Heiko Saul, Christoph Roick, Hartmut Abele +7
In the standard model of particle physics, the weak interaction is described by vector and axial-vector couplings only. Non-zero scalar or tensor interactions would imply an additi…
Undetected Electron Backscattering in PERKEO III
Christoph Roick, Heiko Saul, Hartmut Abele +1
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 elec…
Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam
Bastian Märkisch, Holger Mest, Heiko Saul +8
We present a precision measurement of the axial-vector coupling constant in the decay of polarized free neutrons. For the first time, a pulsed cold neutron beam was used for…