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This paper reports the track multiplicity and kinematics of muons, charged pions, and protons from charged-current inclusiveν μ and ν μ interactions on a water target, measured using a nuclear emulsion detector in the NINJA experiment. A 3-kg water target was exposed to the T2K antineutrino-enhanced beam corresponding to 7.1 × 10 20 protons on target with a mean energy of 1.3 GeV. Owing to the high granularity of the nuclear emulsion, protons with momenta down to 200 MeV=c from the neutrino-water interactions were detected. We find good agreement between the observed data and model predictions for all kinematic distributions other than the number of charged pions and the muon kinematics shapes. These results demonstrate the capability of measurements with nuclear emulsion to improve neutrino interaction models.

We have carried out νμ charged-current interaction measurement on iron using an emulsion detector exposed to the T2K neutrino beam in the J-PARC neutrino facility. The data samples correspond to 4.0 × 1019 protons on target, and the neutrino mean energy is 1.49 GeV. The emulsion detector is suitable for precision measurements of charged particles produced in neutrino-iron interactions with a low momentum threshold thanks to a thin-layered structure and sub-μm spatial resolution. The charged particles are successfully detected, and their multiplicities are measured using the emulsion detector. The cross section was measured to be σFeCC = (1.28 ± 0.11(stat.)+0.12-0.11(syst.)) × 10-38 cm2/nucleon. The cross section in a limited kinematic phase space of induced muons, θμ < 45° and pμ > 400 MeV/c, on iron was σFeCC phase space= (0.84 ± 0.07(stat.)+0.07-0.06(syst.)) × 10-38 cm2/nucleon. The cross-section results are consistent with previous values obtained via different techniques using the same beamline, and they are reproduced well by current neutrino interaction models. These results demonstrate the capability of the detector in the detailed measurement of neutrino-nucleus interactions around the 1 GeV energy region.

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