Abstract
Precise neutrino--nucleus interaction measurements in the sub-multi GeV region are important to reduce the systematic uncertainty in future neutrino oscillation experiments. Furthermore, the excess of ${\nu_e}$ interactions, as a possible interpretation of the existence of a sterile neutrino has been observed in such an energy region. The nuclear emulsion technique can measure all the final state particles with low energy threshold for a variety of targets (Fe, C, H${_2}$O, and so on). Its sub-$\mu$m position resolution allows measurements of the ${\nu_e}$ cross-section with good electron/gamma separation capability. We started a new experiment at J-PARC to study sub-multi GeV neutrino interactions by introducing the nuclear emulsion technique. The J-PARC T60 experiment has been implemented as a first step of such a project. Systematic neutrino event analysis with full scanning data in the nuclear emulsion detector was performed for the first time. The first neutrino event detection and its analysis is described in this paper.
Highlights
Many experimental neutrino oscillation projects are running, or planned, to search for CP violation, and/or to probe the neutrino mass hierarchy [1–9]
Thanks to its high spatial resolution, nuclear emulsion technology contributed to the discovery of the pion [12], of the charmed particle in cosmic rays [13], the direct observation of ντ [14], the discovery of the ντ appearance in a νμ beam [15], and so on
We found that grain density (GD) and fog density (FD) remain at safe levels even after 133 days at 23 ◦ C
Summary
Many experimental neutrino oscillation projects are running, or planned, to search for CP violation, and/or to probe the neutrino mass hierarchy [1–9]. Thanks to its high spatial resolution, nuclear emulsion technology contributed to the discovery of the pion [12], of the charmed particle in cosmic rays [13], the direct observation of ντ [14], the discovery of the ντ appearance in a νμ beam [15], and so on This high spatial resolution allows measurements of all the final state particles with a low energy threshold. A high-speed scanning system for the emulsion has been developed [23–28], and track readout for the entire area in the emulsion has recently become available. This allows one to analyze the emulsions independently of the prediction from the electronic detectors. The first systematic neutrino event analysis from scanning all the data in the nuclear emulsion will be described
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