Abstract
An atomic magnetic resonance based current source has been developed for a new measurement of the proton gyromagnetic ratio in low field. The high-stability current source is realized by the application of more precise magnetic-field-to-frequency converter. We used the method of /sup 4/He metastable spin polarization through optical pumping of Cs atoms, and also a newly designed two-layer solenoid for the purpose. The drift of current is less than 0.1 ppm/h and its random standard deviation is 0.05 ppm.
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