The width of the fission channel for the interaction of photons with²³⁸U nuclei in the quasideuteron energy region

Abstract

A novel formulation of the dependence of the total cross section for the photon-nucleus interaction on photon energy and target mass number is proposed and used to obtain the photofission channel width rF for 238U in the quasideuteron energy range. Comparison with experiments and with different calculations show that the formalism used is quite adequate to explain the generally assumed trend of rF against energy and mass number in this peculiar energy region.NUCLEAR REACTION 238U ( y , Fission), 40 M e V s E,< 80 MeV; calculated total cross section, uT, and fission channel width, rF. Comparison with experimental and calculated values of rF for different interaction models.

Photofission of209Bi,232Th and238U in the quasi-deuteron energy region

“…Although uncertainties associated to calculated fissilities are large, agreement between estimated and measured fissilities are satisfactory at the photon energy of 69 MeV, as considered in [28] and also at higher excitation energies (see (20)). The statistical model seems, however, to fail in foreseing fission probability from fission excitation function on ion collisions [33].…”