Abstract

The gross time distribution and the absolute yield of γ-rays from spontaneous fission of 252Cf have been measured in the time range 0.1–120 ns after fission for γ-ray energies greater than 100 keV. The measurements have been made by the recoil distance method for the shorter times, electronically for the longer times and electronically with a shield between the source and the γ-ray detector for the intermediate times. The absolute yield at 120 ns has been found to be 11.6 ± 1.0 γ-rays per fission, of which 79 % are emitted within 0.1 ns, 11.6 % between 0.1 and 1.0 ns, 6.2 % from 1 to 10 ns and 2.9 % from 10 to 120 ns.

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