The nuclear magnetic moment is the magnetic moment of an atomic nucleus and arises from the spin of the protons and neutrons. It is mainly a magnetic dipole moment; the quadrupole moment does cause some small shifts in the hyperfine structure as well.
The nuclear magnetic moment varies from isotope to isotope of an element. It can only be zero if the numbers of protons and of neutrons are both even.
Read more about Nuclear Magnetic Moment: Shell Model, G-factors, Calculating The Magnetic Moment
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