Speaker
Description
Three-dimensional projection scintillator detectors have demonstrated excellent imaging and tracking performance in recent accelerator-based neutrino experiments. To build on this concept, Brookhaven National Laboratory (BNL) and collaborators are developing a liquid implementation that removes physical voxel boundaries while preserving fine-grained three-dimensional reconstruction. The approach employs an opaque liquid scintillator with a controlled, short scattering length, enabling high-resolution imaging with submerged orthogonal wavelength-shifting fiber readout and reduced mechanical complexity. This design offers additional advantages, including heavy-metal loading to reduce the effective radiation length. Two prototype detectors with fully active liquid volumes and 3D fiber readout have been constructed at BNL and recently characterized in a proton beam. This contribution presents the detector concept, measured optical properties of the opaque scintillator, and initial beam-test results on tracking and timing performance.