Speaker
Christine Klauser
(Institut Laue-Langevin, Atominstitut TU Wien)
Description
Correlation coefficients of the polarized neutron beta decay offer a way to test the standard
model by precision measurements. One of the currently leading systematic errors is the
neutron polarization. State-of-the-art polarizing super mirrors in the X-SM geometry deliver
about 99.7(1)% polarization.
We present recent developments in cold neutron polarization, based on the opaque test bench
of 3He spin filters: We have shown experimentally that the accuracy of polarization analysis
with opaque 3He spin filters is better than 10^-4. By optimizing the operating conditions of
supermirrors and selecting the materials, we have achieved a polarization of 99.97(1) % with
the X-SM geometry for a divergent 5.3 Å beam (monochromatized by a velocity selector). These
results solve the issue of neutron beam polarization for the next generation of neutron beta
decay correlation experiments which aim for accuracies of 10^-4.
Primary author
Christine Klauser
(Institut Laue-Langevin, Atominstitut TU Wien)
Co-authors
David Jullien
(Institut Laue-Langevin)
Jérémie Chastagnier
(Institut Laue-Langevin)
Martin Schneider
(SwissNeutronics)
Nataliya Rebrova
(Universität Heidelberg)
Peter Böni
(TU München)
Pilar Guimera-Millàn
(Institut Laue-Langevin)
Thierry Bigault
(Institut Laue-Langevin)
Torsten Soldner
(Institut Laue-Langevin)
