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Contenuto archiviato il 2022-12-23

Models for the decay of highly excited nuclei

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The intra nuclear cascade model was extended to describe also: -Fission exit-channels, strange particle and hypernucleus production, and multifragmentation, resulting in the combined cascade-fragmentation-evaporation-fission (CFEF) model. -The applicability of the CFEF model for design studies of spallation targets has been demonstrated in bench-mark tests. -Electromagnetic dissociation processes up to energies reached at the RHIC and LHC facilities can be described by the model. The decay of highly excited, compound nuclei by fission and evaporation was described by a combined statistical and diffusion model, where the evolution of the system from the fission barrier towards scission is described by Langevin dynamics in the three-dimensional (c, h, α) (Lawrence) shape parameterization. In this framework: -precission and postscission neutron multiplicities have been calculated and time scales for the descent from saddle to scission obtained, -fission-fragment mass-distributions have been calculated for the first time.

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