New insights on fission of 235U induced by high energy neutrons
arxiv(2024)
摘要
The ^235U(n,f) reaction cross section was measured relative to
neutron-proton elastic scattering for the first time in the energy region from
10 MeV to 440 MeV at the CERN n_TOF facility. Two independent detection
systems were used simultaneously to extract the fission cross section. For
neutron energies below 200 MeV, the present results agree within one standard
deviation with the data available in literature and are well reproduced by the
IAEA evaluation. Above 200 MeV, the comparison of model calculations to the
present data indicates the need to introduce a transient time in the
description of the neutron-induced fission process in order to allow the
simultaneous description of (n,f) and (p,f) reactions.
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