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The weak magnetism correction and its uncertainty to nuclear beta-decay playa major role in determining the significance of the reactor neutrino anomaly.Here we examine the common approximation used for one-body weak magnetism inthe calculation of fission antineutrino spectra, wherein matrix elements of theorbital angular momentum operator contribution to the magnetic dipole currentare assumed to be proportional to those of the spin operator. Although we findthis approximation invalid for a large set of nuclear structure situations, weconclude that it is valid for the relevant allowed beta-decays between fissionfragments. In particular, the uncertainty in the fission antineutrino due tothe uncertainty in the one-body weak magnetism correction is found to be lessthan 1%. Thus, the dominant uncertainty from weak magnetism for reactorneutrino fluxes lies in the uncertainty in the two-body meson-exchange magneticdipole current.

Weak Magnetism Correction to Allowed Beta-decay for Reactor Antineutrino Spectra