  A modified version of the MSW effect is studied within the framework of
screening models through conformal couplings of a scalar field within matter.
Such a coupling leads to a new, unknown interaction between the scalar field
and the neutrino. We mainly look for the discrepancy in the total solar
electron-neutrinos flux through this interaction. Since the scalar field
behavior depends on the local density of matter, we observe an indirect effect
of matter on flavor changes, and subsequently, on neutrino flux through
neutrino decay. The paper ends by describing various probabilities and
comparing the results with observational data.
