
where: In SI units, its value is approximately: In Gaussian CGS units, its value can be given in convenient units as The nuclear magneton is the natural unit for expressing magnetic dipole moments of heavy particles such as nucleons and atomic nuclei. On the contrary, the dipole moment of the electron, which is much higher as a consequence of much...
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http://en.wikipedia.org/wiki/Nuclear_magneton

(from the article `magneton`) ...used in the study of subatomic particles. The Bohr magneton, named for the 20th-century Danish physicist Niels Bohr, is equal to about 9.273 ... ...is the Bohr magneton (equivalent to 9.273 10-24 ampere–square metre). A similar unit for magnetic moments of nuclei, protons, and neutrons is the ... ...
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http://www.britannica.com/eb/a-z/n/61

A constant in the equation relating the difference in energies between parallel and antiparallel spin alignments of atomic nuclei in a magnetic field; used in nuclear magnetic resonance spectrometry. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
(μN) Type: Term Definitions: 1. a constant in the equation relating the difference in energies between parallel and antiparallel spin alignments of atomic nuclei in a magnetic field; used in nuclear magnetic resonance spectrometry; 5.05 ׀ 10−27 J T−1.
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http://www.medilexicon.com/medicaldictionary.php?t=52323

a unit of magnetic moment, used to measure proton spin and approximately equal to Bohr magneton.
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https://www.infoplease.com/dictionary/nuclear-magneton
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