# Study of neutrino interactions in the chorus experiment

The emulsion target of the CHORUS detector was exposed to the wide-band neutrino beam of the CERN SPS between the years 1994 and 1997. In total about 130.000 neutrino interactions were located in the nuclear emulsion target and fully reconstructed. Detailed DATA and Monte Carlo (MC) comparisons were done in order to test reliability of the detector simulation. There is reasonable agreement between DATA and MC. The ratio of deep inelastic neutral-current (NC) to the deep inelastic (DIS) charged-current(CC) $\nu_{\mu}$ interactions was measured to be frac{NC_{dis}}{CC_{dis}}=0.350\pm0.003$. This measurement was compared with the previous measurements. Based on three double charm decays found in NC interactions we measured the ratio of double charm cross-section in NC$\nu_{\mu}$interactions to be $\frac{\sigma (c\bar{c}\nu_\mu)}{\sigma_{NC}}=(3.37^{+3.06}_{-2.51}(stat.)\pm 0.51(syst.))\times 10^{-3}.$ One double charm decay has been observed in CC$\nu_{\mu}$interactions the upper limit on associated charm production in$\nu_{\mu}\$ CC interaction has been found to be $\frac{\sigma c\bar{c}\mu^{-})}{\sigma_{CC}}<9.69 \times 10^{-4}.$ at 90\% C.L.