Speaker
Dr
Ulrich Schmidt
(Physikalisches Institut der Uni Heidelberg)
Description
We search for a spin-dependent P- and T-violating nucleon-nucleon interaction mediated by light pseudoscalar bosons such as axions or axion-like particles. While axions are originally invented to solve the strong CP-problem, nowadays interest in axions is boosted by the fact, the axion is a candidate for dark matter. We performed an ultra-sensitive clock comparison experiment based on the detection of free precession of co-located 3He and 129Xe nuclear spins using SQUIDs as low-noise magnetic flux detectors. The precession frequency shift in the presence of an unpolarized mass was measured to determine the coupling of pseudoscalar particles to the spin of the bound neutron. For boson masses between 2 µeV and 500 µeV (force ranges between 3x10^-4 m – 10^-1 m) we improved the laboratory upper bounds by up to 4 orders of magnitude.
Author
Dr
Ulrich Schmidt
(Physikalisches Institut der Uni Heidelberg)
Co-authors
Mr
Fabian Allmendinger
(Physikalisches Institut,Universität Heidelberg)
Ms
Kathlynne Tullney
(Institut für Physik, Universität Mainz)
Ms
Scharth Anja
(Institut für Physik, Universität Mainz)
Dr
Sergei Karpuk
(Institut für Physik, Universität Mainz)
Prof.
Werner Heil
(Institute of Physics)
Dr
Yury Sobolev
(Institut fuer Physik, Johannes-Gutenberg Universitaet, Mainz)
