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Comparision of Geant4 hadronic models with experimental data. Hans Moritz Günther guenther@cern.ch Supervisor: Gunther Folger. Motivation. Geant4 is a detector simulation toolkit Particles react with material Get mean free path for each process Choose one at random E.g.

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## Comparision of Geant4 hadronic models with experimental data

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**Comparision of Geant4 hadronic models with experimental data**Hans Moritz Günther guenther@cern.ch Supervisor: Gunther Folger**Motivation**• Geant4 is a detector simulation toolkit • Particles react with material • Get mean free path for each process • Choose one at random • E.g. • electromagnetic (Bremsstrahlung, etc.) • Hadronic • User has a choice of models: binary cascade/ bertini cascade**Experimental Geometry**Thin target Simulate 200 000 interactions Get cross section for production of isotopes Compare to experiment**binary**bertini data Data: H. Vonach et al., Physical Review C, 55, 2458, 199705**Generally good agreement with data**Pt Au Data: J. Benlliure et al., Nuclear Physics A 683 (2001) 513–539 and F. Rejmund et al., 540–565**Pt**Au binary data bertini Data: J. Benlliure et al., Nuclear Physics A 683 (2001) 513–539 and F. Rejmund et al., 540–565**binary**data bertini Bertini cascade: Not enough light elements Binary cascade: No fission in my program Elements with even proton number are preferred by models Data: J. Benlliure et al., Nuclear Physics A 683 (2001) 513–539 and F. Rejmund et al., 540–565**Conclusion**• Bertini Cascade reproduces the slope • Both models prefer paired nucleons • Binary cascade must be investigated with fission**Bertini cascade**• Intranuclear Cascade • Nucleus has continous layers • Get reaction produces from library**Binary Cascade**• Intranuclear cascade • Nucleus consists of nucleons • Reactions are binary

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