Polyethylene collimators have been used with fast photomultipliers to spatially resolve the source of 2.45 MeV neutrons in a pulsed, dense, high temperature deuterium plasma. The axial distribution of the neutron source was measured with a spatial resolution of 3 mm and a time resolution of 4 nsec. A time-of-flight technique was developed to measure the average neutron velocity with just one photomultiplier and two widely separated plastic scintillators.
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M. J. Bernstein (1969) studied this question.
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