G-factor (physics) - Measured g-factor Values

Measured g-factor Values

Elementary Particle g-factor Uncertainty
Electron −2.0023193043622 0.0000000000015
Neutron −3.82608545 0.00000090
Proton 5.585694713 0.000000046
Muon −2.0023318414 0.0000000012
Currently accepted NIST g-factor values

The electron g-factor is one of the most precisely measured values in physics, with its uncertainty beginning at the twelfth decimal place.

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