  We have measured the non-equilibrium current noise in a
ballisticone-dimensional wire which exhibits an additional conductanceplateau
at $0.7\times2e^2/h$. The Fano factor shows a clearreduction on the 0.7
structure, and eventually vanishes uponapplying a strong parallel magnetic
field. These results provideexperimental evidence that the 0.7 structure is
associated withtwo conduction channels which have different
transmissionprobabilities.
