New charge exchange model of GEANT4 for 9Be(p,n)9B reaction

Hi,
would there be someone so helpful, that could advise me what was exactly done with G4ChargeExchange model in this article New charge exchange model of GEANT4 for 9Be(p,n)9B reaction - ScienceDirect? I am trying to simulate secondary neutrons from the reaction 7Li(p,n)7Be and I think that this approach could be very useful but I was unable to contact the authors of the article. Thank you for your answers and suggestions.
Marek