{sup 237}U neutron-induced fission cross section

• Published in: Physical review. C, Nuclear physics Vol. 72; no. 4
• Main Author: Maslov, V.M.
• Format: Journal Article
• Language: English
• Published: United States 01-10-2005
• Subjects: CROSS SECTIONS; DEUTERON REACTIONS; ENERGY LEVELS; EXCITATION; FISSION; MEV RANGE; NEUTRON REACTIONS; NEUTRONS; NUCLEAR DEFORMATION; NUCLEAR PHYSICS AND RADIATION PHYSICS; PROBABILITY; URANIUM 236; URANIUM 237; URANIUM 238
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PhysRevC.72.044607

The neutron-induced fission cross section of {sup 237}U target nuclide is calculated consistently with the {sup 238}U(n,F), {sup 238}U(n,2n) and {sup 238}U(n,3n) reaction cross section up to E{sub n}{approx}20 MeV. The fission probability of the {sup 238}U nuclide, fissioning in {sup 238}U(n,nf) reaction is shown to be compatible with the surrogate {sup 236}U(t,pf) fission probability and ratio of fission probability P{sub f}({sup 238}U(d,d'f))/P{sub f}({sup 236}U(d,d'f)), data up to E{sub n}{approx}14 MeV. The {sup 238}U(n,nf) reaction contribution to the observed {sup 238}U(n,F) cross section up to E{sub n}{approx}9 MeV is defined by the collective levels of the {sup 238}U at saddle deformations, lying within the pairing gap. The importance of the lowering of anomalous rotational {gamma}-band K{sup {pi}}=2{sup +} band levels at saddle deformations is demonstrated. The excitation of the two-quasiparticle states at saddle deformations of the fissioniong {sup 238}U nuclide is evidenced.{sup 237}U fission cross section is predicted up to E{sub n}{approx}200 MeV.