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 Physics
3:30 PM–5:18 PM,
Saturday, April 13, 2019
Sheraton
Room: Governor's Square 16
Sponsoring
Units:
GPMFC DAMOP
Chair: Alexander Sushkov, Boston University
Abstract: D07.00002 : New limits on long-range spin-dependent forces mediated by axion-like particles*
4:06 PM–4:42 PM
Presenter:
Michael V Romalis
(Princeton University)
Authors:
Junyi Lee
(Princeton University)
Attaallah Almasi
(Princeton University)
Michael V Romalis
(Princeton University)
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.
*This work was supported by NSF Grant PHY-1404325
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