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`lambda_(C,n) = 1.319 590 9068 * 10-^15 m`

1.31959091E-15

This constant represents the Compton Wavelength of a neutron, `lambda_(C,n)`.

The Compton wavelength is a quantum mechanical property of nuclear/atomic particles that is equivalent to the wavelength of a photon having the same wavelength as the rest mass of the particle. So, in this case, the Compton Wavelength of a neutron represents the wavelength of a neutron's rest mass.

This constant is specified with a standard uncertainty (standard deviation) of: 0.000 000 0011 E-15 m