Deuteron magnetic moment to Bohr magneton ratio

$μ_d/μ_B$ = 4.669 754 568(12) × 10⁻⁴

Value: 4.669 754 568 × 10⁻⁴
Standard uncertainty: 1.2 × 10⁻¹²
Relative uncertainty: 2.6 × 10⁻⁹ (2.6 parts per billion)
Status: Measured
Symbol: $μ_d/μ_B$
Source: CODATA 2022 via NIST · NIST entry

Use in a calculation

# deuteron magnetic moment to Bohr magneton ratio, CODATA 2022 (NIST)
deuteron_magnetic_moment_to_bohr_magneto = 4.669754568e-4  # standard uncertainty 1.2e-12

# SciPy: scipy.constants.physical_constants['deuteron mag. mom. to Bohr magneton ratio']

What it is

The magnetic moment of the deuteron, the nucleus of deuterium (one proton and one neutron), expressed in Bohr magnetons.

How the value changed, 1998–2022

Each point is one CODATA adjustment, plotted as its difference from the 2022 value; the bars show one standard uncertainty (an arrowhead means the bar runs off the chart).

Relative uncertainty

CODATA	Value (uncertainty)	Relative uncertainty	Change from previous
2022	4.669 754 568(12) × 10⁻⁴	2.6 × 10⁻⁹	−0.2 σ of 2018
2018	4.669 754 570(12) × 10⁻⁴	2.6 × 10⁻⁹	+0.6 σ of 2014
2014	0.466 975 4554(26) × 10⁻³	5.6 × 10⁻⁹	−0.1 σ of 2010
2010	0.466 975 4556(39) × 10⁻³	8.4 × 10⁻⁹	+0.0 σ of 2006
2006	0.466 975 4556(39) × 10⁻³	8.4 × 10⁻⁹	−0.2 σ of 2002
2002	0.466 975 4567(50) × 10⁻³	1.1 × 10⁻⁸	+0.2 σ of 1998
1998	0.466 975 4556(50) × 10⁻³	1.1 × 10⁻⁸

“Change from previous” is the shift in the value divided by the standard uncertainty of the previous adjustment. Earlier values are converted into the current unit where NIST changed it (for example J s to J Hz⁻¹).