Abstract

An experiment to determine indirectly the average number of neutrons emitted by fission fragments as a function of fragment mass and total kinetic energy is described. The method is based on the measurement of both fragment kinetic energies and the velocity of one of the fragments, and is particularly applicable to medium or high excitation cases where direct neutron counting is difficult or impractical. Details of the analysis of such an experiment are given, and results for 252Cf spontaneous fission are shown.

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