Deuteron magnetic moment to nuclear magneton ratio

$μ_d/μ_N$ = 0.857 438 2335(22)

Value: 0.857 438 2335
Standard uncertainty: 2.2 × 10⁻⁹
Relative uncertainty: 2.6 × 10⁻⁹ (2.6 parts per billion)
Status: Measured
Symbol: $μ_d/μ_N$
Source: CODATA 2022 via NIST · NIST entry

Use in a calculation

# deuteron magnetic moment to nuclear magneton ratio, CODATA 2022 (NIST)
deuteron_magnetic_moment_to_nuclear_magn = 8.574382335e-1  # standard uncertainty 2.2e-9

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

What it is

The magnetic moment of the deuteron, the nucleus of deuterium (one proton and one neutron), expressed in nuclear 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	0.857 438 2335(22)	2.6 × 10⁻⁹	−0.1 σ of 2018
2018	0.857 438 2338(22)	2.6 × 10⁻⁹	+0.6 σ of 2014
2014	0.857 438 2311(48)	5.6 × 10⁻⁹	+0.0 σ of 2010
2010	0.857 438 2308(72)	8.4 × 10⁻⁹	+0.0 σ of 2006
2006	0.857 438 2308(72)	8.4 × 10⁻⁹	−0.2 σ of 2002
2002	0.857 438 2329(92)	1.1 × 10⁻⁸	+0.5 σ of 1998
1998	0.857 438 2284(94)	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).