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As explained in the doc you provided, this constant appears in the constant database, so you can do:
sage: from scipy.constants import physical_constants
sage: physical_constants["Bohr magneton"]
(9.274009994e-24, 'J T^-1', 5.7e-32)
So you can do something like:
sage: Bohr = physical_constants["Bohr magneton"][0]
sage: Bohr
9.274009994e-24
