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Energy Evolution of the Fission-Product Yields from Neutron-Induced Fission of 235U, 238U, and 239Pu: An Unexpected Observation
https://doi.org/10.1142/9789813229426_0070Cited by:3 (Source: Crossref)
Abstract:
A consistent set of high-precision measurements have been performed to study the energy dependence of the fission product yields of 235U, 238U, and 239Pu using monoenergetic neutrons between 0.5 and 14.8 MeV. The results confirm the progression towards symmetric fission at higher incident neutron energy, i.e., 14.8 MeV. However, at lower energies (En < ∼ 3 MeV) the experimental data reveal a peculiar energy dependence of some of the fission-product yield from neutron-induced fission of 239Pu: a positive slope up to about 4-5 MeV which then turns negative as the incident neutron energy increases. This latter finding at low-energy is in conflict with present theoretical predictions.
