Absolute Magnetometry with He3

Farooq, Midhat; Chupp, Timothy; Grange, Joe; Tewsley-Booth, Alec; Flay, David; Kawall, David; Sachdeva, Natasha; Winter, Peter

doi:10.1103/PhysRevLett.124.223001

Absolute Magnetometry with He3

Jun 6, 2020

6 pages

Published in:

Phys.Rev.Lett. 124 (2020) 22, 223001

Published: Jun 6, 2020

DOI:

10.1103/PhysRevLett.124.223001

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Abstract: (APS)

We report development of a highly accurate (parts per billion) absolute magnetometer based on He3 NMR. Optical pumping polarizes the spins, long coherence times provide high sensitivity, and the He3 electron shell effectively isolates the nuclear spin providing accuracy limited only by corrections including materials, sample shape, and magnetization. Our magnetometer was used to confirm calibration, to 32 ppb, of the magnetic-field sensors used in recent measurements of the muon magnetic moment anomaly (gμ-2), which differs from the standard model by 2.4 ppm. With independent determination of the magnetic moment of He3, this work will lead the way to a new absolute magnetometry standard.

Atomic, Molecular, and Optical Physics

References(70)

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