Measuring high-energy γ-rays with Ge clover detectors

Abstract Gamma-rays with energies up to 20.7 MeV produced by the Pb 208 ( p , γ ) capture reaction were measured with the AFRODITE germanium detector array. The measured full energy peak efficiency of the array is 1.5% at 1.3 MeV and 9 ( 2 ) × 10 - 4 at 15 MeV. The FWHM of capture γ -ray peaks was 50 keV up to the highest measured energies. The efficiency curve has been calculated using a Monte-Carlo simulation code GEANT. The simulation and measurements agree very well.