Measuring high-energy γ-rays with Ge clover detectors

Gamma-rays with energies up to 20.7 MeV produced by the Pb208(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.