Neutral-CurrentνμnandνμpCross Sections from High-Energy Neutrino Interactions in Deuterium

In an exposure of the deuterium-filled 15 ft bubble chamber, $\frac{\sigma ({\nu }_{\mu }n\to {\nu }_{\mu }X)}{\sigma ({\nu }_{\mu }p\to {\nu }_{\mu }X)}$ is measured to be 1.01±0.14. The ratios of neutral-current to charged-current cross sections are 0.30±0.03, 0.22±0.03, and 0.49±0.06 for ${\mathrm{D}}_2$, $n$, and $p$ targets, respectively, which imply values ${u_L}^2=0.19\mathrm{}\pm 0.06$ and ${d_L}^2=0.13\mathrm{}\pm 0.04$ for the neutral-current chiral couplings. Evidence for both $u$- and $d$-quark jets in neutral-current reactions is observed in distributions of energy fraction of the fastest hadron of either charge from each event.