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The flavor asymmetry of the light quark sea of the nucleon is determined inthe kinematic range 0.02<x<0.3 and 1 GeV^2<Q^2<10 GeV^2, for the first timefrom semi-inclusive deep-inelastic scattering. The quantity(dbar(x)-ubar(x))/(u(x)-d(x)) is derived from a relationship between the yieldsof positive and negative pions from unpolarized hydrogen and deuterium targets.The flavor asymmetry dbar-ubar is found to be non-zero and x dependent, showingan excess of dbar over ubar quarks in the proton.Comment: 7 Pages, 2 figures, RevTeX format; slight revision in text, small  change in extraction of dbar-ubar and comparison with a high q2  parameterizatio

Flavor Asymmetry of the Light Quark Sea from Semi-inclusive Deep-Inelastic Scattering