Comparison ofνnandνpCharged-Current Cross Sections from High-Energy Neutrino Interactions in Deuterium

From an analysis of the reaction ${\nu }_{\mu }+d\to {\mu }^{-}+X$, obtained from an exposure of the Fermilab 15-ft deuterium-filled bubble chamber, the ratios of charged-current cross sections for $E_{\nu }>10\mathrm{}$ GeV are determined to be $\frac{\sigma \left(\nu n\right)}{\sigma \left(\nu p\right)}=2.03\mathrm{}\pm 0.28$ for $〈E_{\nu }〉=50\mathrm{}$ GeV, and $\frac{\sigma \left(\overline{\nu }n\right)}{\sigma \left(\overline{\nu }p\right)}=0.51\mathrm{}\pm 0.16$ for $〈E_{\overline{\nu }}〉=40\mathrm{}$ GeV. Bjorken-$x$ distributions for neutron and proton targets show that the majority quark in the nucleon has a broader momentum distribution in the infinite momentum frame than does the minority quark.