Development of a PbWO4 Detector for Single-Shot Positron Annihilation Lifetime Spectroscopy at the GBAR Experiment

Development of a lead-tungstate (PbWO₄) detector that can measure a positron pulse and the ortho-positronium cloud it makes in a single shot, for CERN’s GBAR antimatter experiment.

A PWO crystal with a large dynamic range, plus Geant4-style simulation of how several such detectors could also map the angular distribution of positronium emission and reflection.

GBAR needs a dense positronium target to form antihydrogen ions. A detector that sees both beam intensity and cloud density in one shot is how that target is tuned.