Pulse shape analyzer for fast neutron-gamma ray discrimination

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Abstract

A wide-band differential amplifier has been built to extract pulse shape information from photomultiplier dynode pulses. A zero-crossing is measured at ≈90% of peak pulse amplitude from pulses produced by neutrons and gamma-rays in a liquid scintillator. Subsequent logic circuits uniquely select and sort the gamma ray pulses and neutron pulses into separate channels for identification at rates of up to 50 kHz.

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