Towards More Predictive Nuclear Reaction Modelling
13
the reward is a simultaneous description of a whole isotopic chain. In the case of
238 U neutron-induced fission indeed, fitting experimental fission cross section data
up to 40 MeV requires to adjust the fission parameters for all Uranium isotopes
between 239 U (first-chance fission) and 235 U (fifth chance) as well as other fission
chances due to the opening of proton emission and 4 He emission (see Fig. 5). Semimicroscopic alternatives to such a modelling framework have been studied and have
shown promising results [26, 27]. Even though the accuracy reached is not at the
level required for practical applications, this is a direction to follow in particular if
one aims at studying fission for nuclei far from experimentally accessible regions.
Fig. 5 Illustrations of the coherent modelling of fission cross sections. (a) Neutron-induced fission
cross section on 238 U. (b) Neutron-induced fission cross section on 237 U. (c) Neutron-induced
fission cross section on 236 U. (d) Neutron-induced fission cross section on 235 U. In panel (a), the
vertical lines indicate for which incident neutron energy new fissioning nuclei have to be accounted
for (see text for more explanations). These fissioning systems are indicated in red as well as the
emission process they are involved in
13
the reward is a simultaneous description of a whole isotopic chain. In the case of
238 U neutron-induced fission indeed, fitting experimental fission cross section data
up to 40 MeV requires to adjust the fission parameters for all Uranium isotopes
between 239 U (first-chance fission) and 235 U (fifth chance) as well as other fission
chances due to the opening of proton emission and 4 He emission (see Fig. 5). Semimicroscopic alternatives to such a modelling framework have been studied and have
shown promising results [26, 27]. Even though the accuracy reached is not at the
level required for practical applications, this is a direction to follow in particular if
one aims at studying fission for nuclei far from experimentally accessible regions.
Fig. 5 Illustrations of the coherent modelling of fission cross sections. (a) Neutron-induced fission
cross section on 238 U. (b) Neutron-induced fission cross section on 237 U. (c) Neutron-induced
fission cross section on 236 U. (d) Neutron-induced fission cross section on 235 U. In panel (a), the
vertical lines indicate for which incident neutron energy new fissioning nuclei have to be accounted
for (see text for more explanations). These fissioning systems are indicated in red as well as the
emission process they are involved in