FAMU Experiment @ RIKEN RAL

The FAMU experiment at the RIKEN-RAL muon facility aims to precisely measure the proton Zemach radius through detection of characteristic X-rays from muonic hydrogen. Nuclear Instruments developed custom electronics for the LaBr₃:Ce detectors, including innovative preamplifier circuits and a unique “4-1” SiPM readout architecture. These improvements significantly enhanced time resolution—critical for separating prompt and delayed signals—while maintaining excellent energy resolution in the 100–130 keV range.