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 νₑ from a reactor and νₑ from the Sun could be different. With minimal assumptions, we find a new limit on μ_ν using the 825-d Super-Kamiokande solar neutrino data: |μ_ν|≤1.5×10^-10μB at $90%$ CL, comparable to the existing reactor limit.
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Beacom et al. (1999) studied this question.
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