Dimuon production by neutrinos in the Fermilab 15-foot bubble chamber

In a 326000-picture exposure of the Fermilab 15-ft neon-hydrogen bubble chamber to the quadrupole triplet neutrino beam, 62 dimuon candidates have been found: $0 {\mu }^{+}{\mu }^{+}$, $54 {\mu }^{-}{\mu }^{+}$ and ${\mu }^{+}{\mu }^{-}$, and $8 {\mu }^{-}{\mu }^{-}$. The ${\mu }^{-}{\mu }^{-}$ candidates are consistent with background. The ratio of opposite-sign dimuon events to single-muon events is (0.39±0.10)×${10}^{-2\mathrm{}}$ for a muon-momentum cut of 4 GeV/c. There are 10 $V^0$'s in the opposite-sign dimuon events, yielding a neutral-strange-particle rate per event of 0.6±0.3.