Abstract
A high resolution gamma-ray spectrometer consisting of a 40 cm 3 Ge(Li) detector located at the common centre of two semi-annular NaI(Tl) detectors has been assembled for use in particle accelerator experiments. The three detectors are operated in a triple coincidence and an anti-coincidence mode, simultaneously yielding pair and escape-suppressed spectra in which background and the multiplicity of gamma-ray peaks are reduced. In the pair spectrometer mode the background is reduced considerably relative to the double escape peak e.g. a factor of 20 for a 3.85 MeV gamma ray, and in the escape-suppressed mode by a factor of three to four. The performance of the spectrometer is demonstrated using a Pu- 10B gamma-ray source.
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