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Last update: Apr 1, 2000

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Pre-equilibrium and equilibrium decays in GEANT4

Vicente Lara, Johannes Peter Wellisch

Speaker: Vicente Lara

  In order to allow extrapolation beyond the experimental data and to provide an alternative set of models at conventional energies, theory based hadronic shower models are being developed for the Geant4 simulation tool-kit. Here, for incoming particle energies below O(100 MeV), the precompound reaction mechanism is used to model the high energy continuum region of ejectile spectra and to fill the gap between the arbitrary cutoff of the Intra-Nuclear Cascade models and equilibrium evaporation decays. The behaviour of compound nuclei is then modeled by means of several equilibrium deexcitation models.
  Our designs follows the philosophy of hadronic models in Geant4, allowing for maximum of extendibility and customizability of the underlying physics by means of the use of abstract interfaces. We present the Object Oriented Design of a semiclassical exciton model for pre-equilibrium decays and the Weisskopf-Ewing evaporation model for equilibrium decays. We present extensions, based on Fermi's break-up model for light nuclei and multifragmentation for very high excitation energies. Fission is treated as a evaporation competitive channel.

Presentation:  Adobe Acrobat pdf Short Paper:  Adobe Acrobat pdf 

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