First measurement using a nuclear emulsion detector of the<i>ν</i><i>μ</i>charged-current cross section on iron around the 1 GeV energy region

We have carried out $\nu_{\mu}$ charged-current interaction measurement on iron using an emulsion detector exposed to the T2K neutrino beam in J-PARC facility. The data samples correspond 4.0$\times$10$^{19}$ protons target, and mean energy is 1.49$\,$GeV. suitable for precision measurements of charged particles produced neutrino-iron interactions with a low momentum threshold thanks thin-layered structure sub-$\mu$m spatial resolution. are successfully detected, their multiplicities measured detector. cross section was be $\sigma^{\mathrm{Fe}}_{\mathrm{CC}} = (1.28 \pm 0.11({\mathrm{stat.}})^{+0.12}_{-0.11}({\mathrm{syst.}})) \times 10^{-38} \, {\mathrm{cm}}^{2}/{\mathrm{nucleon}}$. limited kinematic phase space induced muons, $\theta_{\mu} < 45^{\circ}$ $p_{\mu} > 400 {\rm MeV}/c$, $\sigma^{\mathrm{Fe}}_{\mathrm{CC \hspace{1mm} \hspace{0.5mm} space}} (0.84 0.07({\mathrm{stat.}})^{+0.07}_{-0.06}({\mathrm{syst.}})) cross-section results consistent previous values obtained via different techniques same beamline, they well reproduced by current models. These demonstrate capability towards detailed neutrino-nucleus around 1$\,$GeV region.