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| The '''nuclear magneton''' (symbol ''μ''<sub>N</sub>), is a [[physical constant]] of [[magnetic moment]], defined in [[SI units]] by:
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| :<math>\mu_\mathrm{N} = {{e \hbar} \over {2 m_\mathrm{p}}}</math>
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| and in [[Gaussian units|Gaussian]] [[Centimetre gram second system of units|CGS units]] by:
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| :<math>\mu_\mathrm{N} = {{e \hbar} \over{2 m_\mathrm{p}c}}</math>
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| where:
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| :''e'' is the [[elementary charge]],
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| :''ħ'' is the [[reduced Planck constant]],
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| :''m''<sub>p</sub> is the [[proton]] [[rest mass]], and
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| :''c'' is the [[speed of light]] | |
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| In [[SI units]], its value is approximately:
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| :''μ''<sub>N</sub> = {{val|5.05078324|(13)|e=-27|u=[[Joule|J]]/[[Tesla (unit)|T]]}}
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| In [[Gaussian units|Gaussian]] [[Centimetre gram second system of units|CGS units]], its value can be given in convenient units as
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| : ''μ''<sub>N</sub> = {{val|0.105155|u=[[Elementary charge |e]] [[Femtometre |fm]]}}
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| The nuclear magneton is the natural unit for expressing magnetic dipole moments of heavy particles such as [[nucleon]]s and [[Atomic nucleus|atomic nuclei]]. On the contrary, the dipole moment of the electron, which is much higher as a consequence of much higher [[Mass-to-charge ratio|charge-to-mass ratio]], is usually expressed in corresponding units of the [[Bohr magneton]].
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| ==See also==
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| *[[Proton magnetic moment]]
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| *[[Neutron magnetic moment]]
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| *[[Bohr magneton]]
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| ==External links==
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| *[http://physics.nist.gov/cgi-bin/cuu/Value?munev Nuclear magneton], value from [[CODATA]]
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| [[Category:Magnetism]]
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