The Measurement of Absolute Delayed-Neutron Yields from 3.1- and 14.9-MeV Fission

Abstract
A new method, utilizing a modulated neutron source operated in antisynchronism with a long counter, has been used to measure the absolute and relative delayed-neutron yields of five fissionable isotopes for neutron-induced fission at 3.1 and 14.9 MeV. The results, in units of delayed neutrons per fission, for 14.9-MeV fission are: The measured ratios of delayed-neutron yields at 3.1-MeV to those at 14.9-MeV fission are: These new delayed-neutron yield data are in accord with qualitative theoretical predictions but are in marked disagreement with earlier measurements.

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