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We present results of a study of neutrino oscillation based on a 766 ton-yearexposure of KamLAND to reactor anti-neutrinos. We observe 258 \nuebar\candidate events with energies above 3.4 MeV compared to 365.2 events expectedin the absence of neutrino oscillation. Accounting for 17.8 expected backgroundevents, the statistical significance for reactor \nuebar disappearance is99.998%. The observed energy spectrum disagrees with the expected spectralshape in the absence of neutrino oscillation at 99.6% significance and prefersthe distortion expected from \nuebar oscillation effects. A two-neutrinooscillation analysis of the KamLAND data gives \DeltaMSq =7.9$^{+0.6}_{-0.5}\times10^{-5}$ eV$^2$. A global analysis of data from KamLANDand solar neutrino experiments yields \DeltaMSq =7.9$^{+0.6}_{-0.5}\times10^{-5}$ eV$^2$ and \ThetaParam =0.40$^{+0.10}_{-0.07}$, the most precise determination to date.Comment: 5 pages, 4 figures; submitted to Phys.Rev.Letter

Measurement of Neutrino Oscillation with KamLAND: Evidence of Spectral Distortion