Nuclear Magneton

The Bohr magneton's nuclear twin, scaled by the proton mass instead of the electron's.

Specifications & Metrics

symbol

μN

status

Measured — CODATA 2022 adjustment

value

5.0507837393 × 10⁻²⁷ ± 1.6 × 10⁻³⁶ J·T⁻¹

Relative Scale in Constants

Core Principles & Analysis

• 1,836 times smaller than the Bohr magneton, which is why nuclear magnets are hard to see.
• The proton's moment measures 2.79 μN — anomalous, betraying its internal quarks.
• Nuclear magnetic moments power MRI and NMR spectroscopy.