A precise measurement of the muon neutrino–nucleon inclusive charged current cross section off an isoscalar target in the energy range <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mn>2.5</mml:mn><mml:mo>&lt;</mml:mo><mml:msub><mml:mi>E</mml:mi><mml:mi>ν</mml:mi></mml:msub><mml:mo>&lt;</mml:mo><mml:mn>40</mml:mn><mml:mtext> GeV</mml:mtext></mml:math> by NOMAD

We present a measurement of the muon neutrino-nucleon inclusive charged current cross section, off an isoscalar target, in the neutrino energy range 2.5 E 40 GeV. The significance of this measurement is its precision, 4% in 2.5 E 10 GeV, and 2.6% in 10 E 40 GeV regions, where significant uncertainties in previous experiments still exist, and its importance to the current and proposed long baseline neutrino oscillation experiments.