188 citations · 484 across the 11 of their papers we have counts for
11 papers
Polarization-Dependent Disappearance of a Resonance Signal -- Indication for Optical Pumping in a Storage Ring?
W. Nörtershäuser, A. Surzhykov, R. Sánchez +10
We report on laser spectroscopic measurements on Li ions in the experimental storage ring ESR at the GSI Helmholtz Centre for Heavy Ion Research. Driving the $2s\,^3\!{S}_1\;(F…
Measurement of the Permanent Electric Dipole Moment of the Xe Atom
F. Allmendinger, I. Engin, W. Heil +7
We report on a new measurement of the CP-violating permanent Electric Dipole Moment (EDM) of the neutral Xe atom. Our experimental approach is based on the detection of the…
Upgrade of the ultracold neutron source at the pulsed reactor TRIGA Mainz
Jan Kahlenberg, Dieter Ries, Kim Ulrike Ross +13
The performance of the upgraded solid deuterium ultracold neutron source at the pulsed reactor TRIGA Mainz is described. The current configuration stage comprises the installation…
Comparison of ultracold neutron sources for fundamental physics measurements
G. Bison, M. Daum, K. Kirch +20
Ultracold neutrons (UCNs) are key for precision studies of fundamental parameters of the neutron and in searches for new CP violating processes or exotic interactions beyond the St…
Limit on Lorentz-Invariance- and CPT-Violating Neutron Spin Interactions Using a He-Xe Comagnetometer
Fabian Allmendinger, Ulrich Schmidt, Werner Heil +2
We performed a search for a Lorentz-invariance- and CPT-violating coupling of the He and Xe nuclear spins to posited background fields. Our experimental approach is to…
Test of Time Dilation Using Stored Li+ Ions as Clocks at Relativistic Speed
Benjamin Botermann, Dennis Bing, Christopher Geppert +14
We present the concluding result from an Ives-Stilwell-type time dilation experiment using 7Li+ ions confined at a velocity of beta = v/c = 0.338 in the storage ring ESR at Darmsta…
New limit on Lorentz and CPT violating neutron spin interactions using a free precession 3He-129Xe co-magnetometer
F. Allmendinger, W. Heil, S. Karpuk +6
We report on the search for a CPT and Lorentz invariance violating coupling of the 3He and 129Xe nuclear spins (each largely determined by a valence neutron) to background tensor f…
Modern Ives-Stilwell Experiments At Storage Rings: Large Boosts Meet High Precision
G. Gwinner, B. Botermann, C. Geppert +14
We give a brief overview of time dilation tests using high-resolution laser spectroscopy at heavy-ion storage rings. We reflect on the various methods used to eliminate the first-o…
Comment on "Missing Transverse-Doppler Effect in Time-Dilation Experiments with High-Speed Ions"
G. Saathoff, S. Reinhardt, R. Holzwarth +14
In an article "Missing Transverse-Doppler Effect in Time-Dilation Experiments with High-Speed Ions" by S. Devasia [arXiv:1003.2970v1], our recent Doppler shift experiments on fast…
Limit on Lorentz and CPT violation of the bound Neutron Using a Free Precession 3He/129Xe co-magnetometer
C. Gemmel, W. Heil, S. Karpuk +11
We report on the search for Lorentz violating sidereal variations of the frequency difference of co-located spin-species while the Earth and hence the laboratory reference frame ro…
Test of Lorentz Symmetry by using a 3He/129Xe Co-Magnetometer
K. Tullney, C. Gemmel, W. Heil +11
To test Lorentz symmetry we used a 3He/129Xe co-magnetometer. We will give a short summary of our experimental setup and the results of our latest measurements. We obtained prelimi…