Proton Compton wavelength = 1.321 409 853 60 × 10⁻¹⁵ m

Name: Proton Compton wavelength — CODATA 2022 value
Creator: NIST

Value: 1.321 409 853 60 × 10⁻¹⁵
Unit: m
Uncertainty: 0.000 000 000 41 × 10⁻¹⁵
Copy-ready: 1.32140985360e-15

Compton wavelength of the proton, λ = h/(mc): the wavelength of a photon whose energy equals the particle's rest energy.

Below this length the particle cannot be treated as a classical point; it also sets the wavelength shift in Compton scattering. The reduced form ƛ = λ/2π is listed beneath.

The same quantity, other ways NIST lists it

Quantity (NIST name)	Value	Unit	Uncertainty
Reduced proton Compton wavelength	2.103 089 100 51 × 10⁻¹⁶	m	0.000 000 000 66 × 10⁻¹⁶

NIST, Fundamental Physical Constants — Complete Listing (2022 CODATA adjustment), retrieved 2026-07-26.

Compton wavelengths, radii and cross sections

Alpha particle rms charge radius Deuteron rms charge radius Muon Compton wavelength Neutron Compton wavelength Proton Compton wavelength Proton rms charge radius Tau Compton wavelength Thomson cross section

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UsePhysics. "Proton Compton wavelength — 1.321 409 853 60 × 10−15 m." UsePhysics.com. https://usephysics.com/reference/proton-compton-wavelength. Value from the 2022 CODATA adjustment (NIST). Accessed [date].