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In this article we investigate the characteristic effects of the dependence of the neutrino mass on the visible matter envi- ronment for solar and reactor neutrinos. We find that, although the inclusion of the environment dependent terms can lead to certain improvement of the quality of the fit in the most favour LMA region for well determined values of the new parame- ters, (in agreement with the result of Ref. (1)), this improve- ment does not hold much statistical significance. However, the inclusion of these effects, can substantially improve the quality of the fit in the high-Dm2 (LMA-II) region which can be allowed at 98.9% CL. Still, if we assume that the presence of this new effect is not strong enough to break adiabaticity of solar neutrino evolution, the combined analysis of the so- lar (2-7) and KamLAND data (8) in these scenarios results into a constraint on the possible dependence of the neutrino mass on the ordinary matter density. Consequently, we derive an upper bound on the product of the effective neutrino-scalar (ln) and matter-scalar (l f ) Yukawa couplings, which depends on the mass of the scalar field. We investigate also the possibility that this new mechanism plays a leading role in reactor and solar neutrinos instead of the usual conversion mechanism through mass and mixing. In this context, reactor neutrino data are fully explained by a mass-varying neutrino mechanism, and strong non-adiabatic effects in solar neutrino evolution produces the correct energy dependence in solar neutrino conversion to reproduce experi- mental data.

Constraints on the environment depence of the neutrino mass from solar and reactor neutrino data