Last update:
Apr 1, 2000
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Pre-equilibrium and equilibrium decays in GEANT4
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Vicente Lara,
Johannes Peter Wellisch
CERN
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:  | Short Paper: |
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