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Matter-enhanced antineutrino flavor transformation between {ν}ₑ and {ν}_μ(τ) can occur in supernovas if the vacuum masses for these species satisfy m_νe>m_νμ(τ). For {δ}m²>1 eV², such flavor transformation can affect the electron fraction Yₑ in the neutrino-heated supernova ejecta. We point out that such flavor transformations will not drive Yₑ>0.5 at the r-process nucleosynthesis epoch in the best available supernova model for such nucleosynthesis. Consequently, there is no obvious conflict between the matter-enhanced antineutrino flavor transformation {ν}_e∥{ν}_μ(τ) and r-process nucleosynthesis in the neutrino-heated supernova ejecta.
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Qian et al. (1995) studied this question.
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