ConstantID

Deuteron g factor

Atomic & nuclearMeasured

gd = 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
gd
Source
CODATA 2022 via NIST · NIST entry

Use in a calculation

# deuteron g factor, CODATA 2022 (NIST)
deuteron_g_factor = 8.574382335e-1  # standard uncertainty 2.2e-9

# SciPy: scipy.constants.physical_constants['deuteron g factor']

What it is

The g-factor of the deuteron, the nucleus of deuterium (one proton and one neutron): the pure number that relates its magnetic moment to its spin angular momentum. A negative value means the moment points opposite to the spin.

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).

deuteron g factor: CODATA values 1998–2022 relative to the 2022 value, in parts per billion, with one-standard-uncertainty bars−6−4−20+2+4+6parts per billion1998200220062010201420182022

Relative uncertainty

deuteron g factor: relative standard uncertainty in each CODATA adjustment, logarithmic scale10⁻¹⁰10⁻⁹10⁻⁸1998200220062010201420182022
CODATAValue (uncertainty)Relative uncertaintyChange from previous
20220.857 438 2335(22)2.6 × 10−9 −0.1 σ of 2018
20180.857 438 2338(22)2.6 × 10−9 +0.6 σ of 2014
20140.857 438 2311(48)5.6 × 10−9 +0.0 σ of 2010
20100.857 438 2308(72)8.4 × 10−9 +0.0 σ of 2006
20060.857 438 2308(72)8.4 × 10−9

“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).

Related constants

Atomic & nuclear μd/μe Deuteron-electron magnetic moment ratio −4.664 345 550(12) × 10−4 Atomic & nuclear md/me Deuteron-electron mass ratio 3670.482 967 655(63) Atomic & nuclear μd Deuteron magnetic moment 4.330 735 087(11) × 10−27 J T−1 Atomic & nuclear μd/μB Deuteron magnetic moment to Bohr magneton ratio 4.669 754 568(12) × 10−4 Atomic & nuclear μd/μN Deuteron magnetic moment to nuclear magneton ratio 0.857 438 2335(22) Atomic & nuclear md Deuteron mass 3.343 583 7768(10) × 10−27 kg Atomic & nuclear mdc2 Deuteron mass energy equivalent 3.005 063 234 91(94) × 10−10 J Atomic & nuclear mdc2 Deuteron mass energy equivalent in MeV 1875.612 945 00(58) MeV