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New Limit on the Permanent Electric Dipole Moment of 129Xe using 3He Comagnetometry and SQUID Detection

Speaker(s) / Presenter(s):
Natasha Sachdeva

We report results of a new technique to measure the electric dipole moment of 129Xe with 3He comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred to a measurement cell, and transported into a magnetically shielded room, where SQUID magnetometers detect free precession in applied electric and magnetic fields. The result from a one-week measurement campaign in 2017 and a 2.5 week campaign in 2018, combined with detailed study of systematic effects, is dA(129Xe)=(1.4±6.6stat±2.0syst)×10−28 ecm. This corresponds to an upper limit of |dA(129Xe)|<1.4×10−27ecm (95% CL), a factor of five more sensitive than the limit set in 2001.


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