Abstract
A pulse-shape discrimination technique has been developed using a dual constant-fraction discriminator combination to analyze γ-ray pulses from a Ge(Li) coaxial detector, in order to obtain improved time resolution for this type of detector. A theoretical analysis of the pulse shapes from a coaxial detector as a function of the position of irradiation in the detector, and the synthesis of these pulses in a Constant-Fraction Pulse-Height Discriminator has been completed to form a theoretical base to the technique. Typical results for coincidence measurements with a 23 cm 3 coaxial detector and a plastic scintillator are: 1.09 ns fwhm and 2.02 ns fw(0.1)m for a γ-ray energy range of 1.10 ≤ E ≤ 1.35 MeV and 650 ps fwhm for a 3.16 MeV γ-ray.
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