Speaker
Dr
Kathlynne Tullney
(Institute of physics, Johannes-Gutenberg University Mainz)
Description
A possible solution to the strong CP problem is a light pseudoscalar boson, the so-called axion. The axion would cause a new spin-dependent short-range interaction. Of interest here is the search for an axion mediated short range interaction between a fermion and the spin of another fermion. To search for this effect, co-located, nuclear spin polarized 3He and 129Xe gas is used to become independent of magnetic field drifts.
The new approach is to measure the free nuclear spin precession frequencies in a homogeneous magnetic guiding field of about 350 nT using LTc SQUID detectors. The whole setup is housed in a magnetically shielded room at the Physikalisch Technische Bundesanstalt (PTB) in Berlin. With this setup long nuclear-spin coherence times of several hours for both gases can be achieved.
In this talk we present results which improve the present upper limits on the scalar-pseudoscalar coupling of axion-like particles in the axion-mass window from 10^(-2) eV to 10^(-6) eV by up to four orders of magnitude [1].
[1] K. Tullney et al., Phys. Rev. Lett. 111, 100801 (2013).
Primary author
Dr
Kathlynne Tullney
(Institute of physics, Johannes-Gutenberg University Mainz)
Co-authors
Mr
Fabian Allmendinger
(Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg)
Prof.
Heil Werner
(Institute of Physics, Johannes-Gutenberg University Mainz)
Dr
Iouri Sobolev
(Institute of Nuclear Chemistry, Johannes-Gutenberg University Mainz)
Dr
Sergej Karpuk
(Institute of Nuclear Chemistry, Johannes-Gutenberg University Mainz)
Prof.
Ulrich Schmidt
(Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg)
