Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session D07: Magnetic Resonance Tests of Fundamental PhysicsInvited
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Sponsoring Units: GPMFC DAMOP Chair: Alexander Sushkov, Boston University Room: Sheraton Governor's Square 16 |
Saturday, April 13, 2019 3:30PM - 4:06PM |
D07.00001: Progress on the ARIADNE axion experiment Invited Speaker: Andrew Albert Geraci The QCD axion is a particle postulated to exist to explain the lack of Charge-Parity (CP) violation in the strong interactions, and the associated unexpected smallness of the neutron electric dipole moment. It also happens that the axion could constitute all or part of the Dark matter in the universe, thus making it an “economical” solution to some of the greatest puzzles in cosmology and high-energy physics. While the focus in the community has mainly been on cosmic axion searches, axions can also generate novel spin-dependent short-range forces between nuclei in table-top experiments. The Axion Resonant InterAction Detection Experiment (ARIADNE) is a collaborative effort to search for the QCD axion, using a technique based on nuclear magnetic resonance. The aim is to detect axion-mediated short-range interactions between laser-polarized 3He nuclei and an unpolarized tungsten source mass. The experiment has the potential to probe deep within the theoretically interesting regime for the QCD axion in the mass range of 0.01-10 meV. In this talk I will discuss the basic principle of the experiment and the current experimental status. |
Saturday, April 13, 2019 4:06PM - 4:42PM |
D07.00002: New limits on long-range spin-dependent forces mediated by axion-like particles Invited Speaker: Michael V Romalis I will describe recent results of our searches for new long-range spin-dependent forces using atomic co-magnetometers. In one experiment we used two 250 kg movable lead weights to search for a CP-violating spin-mass interaction with 3He nuclear spins. In another experiment we used a rotatable SmCo5 permanent magnet to search for non-magnetic spin-spin interactions between electron and 21Ne nuclear spins. Both experiments use optically-pumped alkali-metal vapor to polarize the nuclear spins, readout their spin precession signals, and cancel ordinary magnetic fields acting on the nuclear spins. We have improved prior limits on anomalous nuclear spin dependent forces mediated by particles lighter than about 1 μeV. I will also briefly describe our current efforts to develop next-generation atomic co-magnetometers for precision measurements of nuclear spin-dependent interactions. |
Saturday, April 13, 2019 4:42PM - 5:18PM |
D07.00003: Limits on the permanent electric dipole moment of 129Xe Invited Speaker: Lorenz Willmann Any precise value of a CP-violating electric dipole moment (EDM) on a fundamental particle has large impact on the Standard Model (SM). In case its value is larger than predicted by SM it would be direct evidence of New Physics. This has lead to a considerable number of experiments on particles, atoms, molecules and condensed matter systems. These approaches differ substantially in their intrinsic sensitivity and associated systematic uncertainties. We focus on conceptually different experimental implementation with an emphasis on the differences in sensitivity and characteristic time scales of the experiments. One approach exploits molecules such as barium monofluoride (BaF) which offer large intrinsic enhancement factors for a potential electron EDM and has typical coherence times of several 10ms. This experiment is currently set up at the University of Groningen. A different approach is utilizing spin precession of polarized noble gases, which is sensitive in particular to nuclear EDMs. Here coherence times are of order 103 s. The MIXed collaboration (University of Heidelberg, GER, University of Mainz, GER, FZ Jülich, GER and University of Groningen, NL) has performed a measurement campaign on a gas mixture of spin-polarized 3He (co-magnetometer) and 129Xe in a 10cm diameter spherical glass cell. The experiment is performed in a magnetically shielded room at Forschungszentrum Jülich and it uses a guiding magnetic field of 400nT. The preliminary results on the EDM in the 129Xe of these measurements will be presented which exceed the existing present limits.
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