Neutron Compton wavelength = 1.319 590 903 82 × 10⁻¹⁵ m

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

Value: 1.319 590 903 82 × 10⁻¹⁵
Unit: m
Uncertainty: 0.000 000 000 67 × 10⁻¹⁵
Copy-ready: 1.31959090382e-15

Compton wavelength of the neutron, 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 neutron Compton wavelength	2.100 194 1520 × 10⁻¹⁶	m	0.000 000 0011 × 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. "Neutron Compton wavelength — 1.319 590 903 82 × 10−15 m." UsePhysics.com. https://usephysics.com/reference/neutron-compton-wavelength. Value from the 2022 CODATA adjustment (NIST). Accessed [date].