Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-07-06
Phys.Rev.C82:044610,2010
Physics
Nuclear Physics
Nuclear Theory
16 pages, 20 figures. Submitted to Phys. Rev. C
Scientific paper
10.1103/PhysRevC.82.044610
We present a statistical-model description of fission, in the framework of compound-nucleus decay, which is found to simultaneously reproduce data from both heavy-ion-induced fusion reactions and proton-induced spallation reactions at around 1 GeV. For the spallation reactions, the initial compound-nucleus population is predicted by the Li\`{e}ge Intranuclear Cascade Model. We are able to reproduce experimental fission probabilities and fission-fragment mass distributions in both reactions types with the same parameter sets. However, no unique parameter set was obtained for the fission probability. The introduction of fission transients can be offset by an increase of the ratio of level-density parameters for the saddle-point and ground-state configurations. Changes to the finite-range fission barriers could be offset by a scaling of the Bohr-Wheeler decay width as predicted by Kramers. The parameter sets presented allow accurate prediction of fission probabilities for excitation energies up to 300 MeV and spins up to 60 \hbar.
Charity Robert J.
Cugnon Joseph
Mancusi Davide
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