Fissionability of nuclides in the thorium region at excitation energies to 100 MeV

We have measured seven and compiled from the literature seventeen excitation functions for spallation residues from the interaction of 10-100 MeV protons on ²³²Th. Calculations of these excitation functions have been made using the theoretical framework of the pre-equilibrium exciton model of nuclear reactions to which has been added a fission option. The fit of the theory to the experimental data is excellent, lending confidence to our treatment of the competition between fission and particle emission. After showing and discussing the comparison of the calculated and experimental results, we present representative graphs of the variations in fissionability with Z²A and with the excitation energy.NUCLEAR REACTIONS ²³²Th(p,xn), x=1, 3, 5-7; (p,pxn), x=1, 4-6; (p,$2pxn$), x=3-7; (p,$3pxn$), x=5-7. E=10-100 MeV; measured σ(E), calculated σ(E), Γf, Γₙ, Γₚ, Γ_α.