Diffractive-Like (or Parametric-Resonance-Like?) Enhancement of the Earth (Day-Night) Effect for Solar Neutrinos Crossing the Earth Core

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Abstract
It is shown that the strong enhancement of the Earth (day-night) effect for solar neutrinos crossing the Earth core in the case of the small mixing angle MSW electron neutrino to muon (tau) neutrino transition solution of the solar neutrino problem is due to a new diffractive-like (or parametric-resonance-like?) effect in the solar neutrino transitions in the Earth and not just to the MSW effect in the core. The conditions for existence of this new enhancement effect are discussed. The effect exhibits strong dependence on the neutrino energy. Analytic expression for the probability accounting for the solar neutrino transitions in the Earth, which provides a high precision description of the transitions, including the difractive-like (parametric-resonance-like?) enhancement, is derived. The implications of our results for the searches of the day-night effect in the solar neutrino experiments are also briefly discussed.

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