What is "nuclear magneton"

n. (context physics English) The unit of magnetic moment used to describe nucleons such as the proton.

The value of nuclear magneton

system of units

value

unit

SI

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J· T

CGS

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Erg· G

eV

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eV· T

The nuclear magneton (symbol μ), is a physical constant of magnetic moment, defined in SI units by:

$$\mu_\mathrm{N} = {{e \hbar} \over {2 m_\mathrm{p}}}$$

and in Gaussian CGS units by:

$$\mu_\mathrm{N} = {{e \hbar} \over{2 m_\mathrm{p}c}}$$

where:

e is the elementary charge, ħ is the reduced Planck constant, m is the proton rest mass, and c is the speed of light

In SI units, its value is approximately:

μ =

In Gaussian CGS units, its value can be given in convenient units as

μ =

The nuclear magneton is the natural unit for expressing magnetic dipole moments of heavy particles such as nucleons and atomic nuclei.

The magnetic dipole moment of the electron, which is much larger as a consequence of much larger charge-to-mass ratio, is usually expressed in units of the Bohr magneton. The Bohr magneton, which is calculated in the same fashion as the nuclear magneton, is larger than μ by a factor equal to the ratio of the proton to electron mass, or about a factor of 1836.