A sipm-based gamma spectrometer for nuclear science

The architecture of the GAMMA module and its experimental characterization are discussed in this paper. GAMMA is a novel, compact spectrometer (13 cm × 13 cm × 15 cm) that couples a 3 × 3 LaBr3 cylindircal crystal to a large array of SiPM detectors. The custom ASIC developed features 85 dB dynamic range per channel, in order to fully exploit the high conversion efficiency of the crystal. Machine-learning algorithms embedded in the FPGA-based DAQ allow for real-time 2D spatial sensitivity of the point of interaction in the crystal. The measured energy resolution of the module is 2.7% at 662 keV, with 0.6% maximum linearity error up to 9MeV.