Symmetric uranium neutron-induced fission
The symmetric SL-mode fission cross sections of 235U(n, f) and 238U(n, f) are analyzed up to the emissive fission threshold within a Hauser–Feshbach statistical model. A separate outer fission barrier is assumed for the SL-mode, while the inner one is assumed to be the same for the symmetric SL- and...
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Published in | Nuclear physics. A Vol. 705; no. 3; pp. 352 - 363 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
15.07.2002
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Subjects | |
Online Access | Get full text |
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Summary: | The symmetric SL-mode fission cross sections of
235U(n,
f) and
238U(n,
f) are analyzed up to the emissive fission threshold within a Hauser–Feshbach statistical model. A separate outer fission barrier is assumed for the SL-mode, while the inner one is assumed to be the same for the symmetric SL- and the asymmetric S1- and S2-modes. Axial asymmetry and mass-symmetry is assumed for the outer saddle of the SL-mode, as distinct from the S1- and S2-modes, which are axially symmetric and mass-asymmetric. The observed fission cross section behaviour is modelled using the interplay of few-quasiparticle excitations in the level density of the fissioning and residual nuclei. The SL-mode fission cross section seems to be controlled by a rather high outer fission barrier with significant transparency. |
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ISSN: | 0375-9474 |
DOI: | 10.1016/S0375-9474(02)00654-1 |