- Value
- 2.127 78 × 10−15
- Unit
- m
- Uncertainty
- 0.000 27 × 10⁻¹⁵
- Copy-ready
2.12778e-15
The root-mean-square radius of the deuteron's charge distribution.
Enters the hydrogen–deuterium isotope shift in precision laser spectroscopy.
NIST, Fundamental Physical Constants — Complete Listing (2022 CODATA adjustment), retrieved 2026-07-26.
Compton wavelengths, radii and cross sections
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UsePhysics. "Deuteron rms charge radius — 2.127 78 × 10−15 m." UsePhysics.com. https://usephysics.com/reference/deuteron-rms-charge-radius. Value from the 2022 CODATA adjustment (NIST). Accessed [date].