Abstract
A spectrometer system has been constructed to study 0.06–12 MeV neutron-capture γ-rays produced at the thermal-beam facility of the Livermore Pool Type Reactor. The system consists of two spectrometers, designed to cover the low-energy (0.06–2.5 MeV) and high-energy (2–12 MeV) portions of the spectrum. The low-energy system consists of a Ge(Li) detector surrounded by a NaI(Tl) anti-Compton shield, operated in anticoincidence. The high-energy system consists of a Ge(Li) detector flanked by two NaI(Tl) counters and operated in the coincidence mode as a “three-crystal pair spectrometer”. These systems are operated independently, or in coincidence. In the latter case, certain NaI(Tl) modes must be disengaged to obtain adequate coincidence efficiency. An automated pulser is used for linearity calibration and stabilization. Coincidence data is processed by a 4096-channel three-parameter pulse-height analyzer, buffered onto magnetic tape, and analyzed off-line by digital computers.
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