According to the documentation, the only fission model in Geant4 that produces fragments is G4ParaFissionModel. However, if the .hh file is included in the user code there are multiple errors at compile time. For example: the G4ParaFissionModel class make a call to a function called Clear in the G4HadFinalState class with the wrong number of arguments.
Compilation errors have been fixed, and the new version will appear in the next patch or release. A proper splitting of this class into header and implementation files will have to await a directory re-organization due to some circular dependencies.
