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We find that magnetic neutrino-electron scattering is unaffected by oscillations for vacuum mixing of Dirac neutrinos with only diagonal moments and for Majorana neutrinos with two flavors. For Mikheyev-Smirnov-Wolfenstein mixing, these cases are again obtained, though the effective moments can depend on the neutrino energy. Thus, e. g. , the magnetic moments measured with {}₄ from a reactor and ₄ from the Sun could be different. With minimal assumptions, we find a new limit on _ using the 825-d Super-Kamiokande solar neutrino data: |_|1. 510^-10₁ at 90% CL, comparable to the existing reactor limit.
Beacom et al. (Mon,) studied this question.