A precise measurement of the neutrino energy is important in neutrino oscillation experiments. However, in current neutrino experiments, detection of the neutron in the final state of the neutrino interaction is missing. That makes neutrino energy underestimated compared to true neutrino energy. A 3D projection scintillator tracker(3DST), which consists of a large number of optically isolated scintillator cubes, can detect the neutrons event-by-event via time-of-flight technique. The neutron detection improves neutrino energy reconstruction, and specific interaction channels can be selected such as the low-energy transfer that can provide a neutrino flux constraint. This poster shows a study on the neutron detection with 3DST and the low-energy transfer interaction channel with simulation data.