The γ-ray energy response of the Oslo Scintillator Array OSCAR

Abstract The new Oslo Scintillator Array (OSCAR) has been commissioned at the Oslo Cyclotron Laboratory (OCL). It consists of 30 large volume ( ⌀ 3.5 × 8 inches) LaBr 3 (Ce) detectors that are used for γ -ray spectroscopy. The response functions for incident γ rays up to 20 MeV are simulated with Geant4 . In addition, the resolution, and the total and full-energy peak efficiencies are extracted. The results are in very good agreement with measurements from calibration sources and experimentally obtained mono-energetic in-beam γ -ray spectra.