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We report on a search for the day-night asymmetry of the Be-7 solar neutrinorate measured by Borexino at the Laboratori Nazionali del Gran Sasso (LNGS),Italy. The measured value, Adn=0.001 +- 0.012 (stat) +- 0.007 (syst), shows theabsence of a significant asymmetry. This result alone rejects the so-called LOWsolution at more than 8.5 sigma. Combined with the other solar neutrino data,it isolates the Large Mixing Angle (LMA) -- MSW solution at DeltaChi2 > 190without relying on the assumption of CPT symmetry in the neutrino sector. Wealso show that including the day-night asymmetry, data from Borexino alonerestricts the MSW neutrino oscillations to the LMA solution at 90% confidencelevel.

Absence of day-night asymmetry of 862 keV Be-7 solar neutrino rate in Borexino and MSW oscillation parameters