Synchrocyclotron 200-Meter Flight Path Neutron Velocity Spectrometer

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Abstract
Our synchrocyclotron neutron time-of-flight spectrometer now uses a 200-m flight path and two 2000-channel analyzers. The many important modifications and improvements described in this paper have been made as a result of operating experience. The present operation uses ∼20 nsec bursts at an instantaneous intensity ∼5×1018 evaporation neutrons per second and a 60-cps repetition rate. The resolution for energies above 1 keV is now limited by the time analyzers which have 100-nsec detection channel widths, giving a resolution of 0.5 nsec/m in the keV region.

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