Study of the light response of an arch-shaped scintillator with direct coupling to a Silicon Photomultiplier readout

We report about a study of the light response of a solid polystyrene-based scintillator with an arch shaped geometry, directly coupled to Silicon Photo Multiplier sensors for the light readout. This geometry is relevant for the design of a novel borehole detector for "muography" applications in Civil Engineering, Geology or Archaeology. The scintillator response has been investigated using a dedicated experimental set-up based on the detection of cosmic ray muons. Configurations that use reflecting and diffusive materials have been tested, as well as configurations with a cover specifically designed to enclose and protect the scintillator. The results found a good compromise between the light response and an easy solution for the detector assembly.