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The proton and neutron are both spin 1/2 particles, and thus have well defined magnetic moments. For an elementary spin 1/2 particle of charge $e$ and mass $m$: $$\mu = \frac{e\hbar}{2mc}$$ defines the naive magneton. For a proton (electron), it is called the nuclear (Bohr) magneton, $\mu_N$ ($\mu_B$). In the lab, a particle's magnetic moment differs from ...

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