A neutrino magnetic moment greater than 10_^-12_μB^, the Bohr magneton, would have important implications for gravitational-collapse supernovae. Also, it has been suggested that μμB~10^-10 might solve the solar neutrino problem. However, we show that the neutrino observations of SN1987A and general optical observations of supernovae set a firm upper limit of μμB<5×10^-13. This limit is about 100 times better than the best experimental determination and previous astrophysical limits, and 10-20 times better than a previous limit based on big-bang nucleosynthesis.
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Lattimer et al. (1988) studied this question.
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