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- W1973297807 abstract "The transition from asymmetric to symmetric fission as dependent on the excitation energy and nucleon composition of fissioning Th and Pa nuclei is investigated for the 232Th(n, F) and 232Th(p, F) reactions, respectively. Observed neutron-induced fission cross sections are described in a fission/evaporation approximation. A separate relatively high outer fission barrier EfBSL with significant curvature was assumed for the symmetric mode, while the inner one (EfASL(AS)) was assumed to be the same for symmetric (SL) and asymmetric (AS) modes. Axial asymmetry and mass symmetry is assumed for the outer saddle of the SL-mode, as distinct from the AS-mode. A drop of (EfASL−EfAAS)=3.5MeV to ∼1–1.5 MeV for Th and Pa nuclei with A⩽226 is responsible for the increase of the symmetric fission contribution to 225,229,230,231,232Th(n, F) or 232Th(p, F) fission cross sections with nucleon energy up to En(p)=200MeV. It is shown that with increase of the En(p) above ∼80MeV the 229,230,231,232Th(n, F) fission cross sections are no longer dependent on the Th target nuclide fissility. The dependence of 232Th fission cross section on the incident particle (n or p) is predicted to be different than in case of 238U target nuclide." @default.
- W1973297807 created "2016-06-24" @default.
- W1973297807 creator A5035179554 @default.
- W1973297807 date "2007-06-01" @default.
- W1973297807 modified "2023-09-25" @default.
- W1973297807 title "Symmetric vs asymmetric nucleon-induced fission of thorium up to 200 MeV" @default.
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- W1973297807 doi "https://doi.org/10.1016/j.physletb.2007.04.038" @default.
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