  We examine the effects of a scalar field, coupled only to neutrinos, on
oscillations among weak interaction current eigenstates. The existence of a
real scalar field is manifested as effective masses for the neutrino mass
eigenstates, the same for $\nbar$ as for $\n$. Under some conditions, this can
lead to a vanishing of $\delta m^2$, giving rise to MSW-like effects. We
present an idealized example and show that it may be possible to resolve the
apparent discrepancy in spectra required by r-process nucleosynthesis in the
mantles of supernovae and by Solar neutrino solutions.
