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Forum: Hadronic Processes
Re: Question charge exchange model for proton induced spallation (Cristian Bungau)
Re: Idea Re: charge exchange model for proton induced spallation (Vladimir Ivanchenko)
Re: More Re: charge exchange model for proton induced spallation (Cristian Bungau)
Re: Idea Re: charge exchange model for proton induced spallation (Vladimir Ivanchenko)
Date: 02 Oct, 2015
From: Cristian Bungau <Cristian Bungau>

Hello again Vladimir,

Yes, they do that and it does make sense. However, they present different models results: Binary Cascade alone (BIC), PreCompound alone, Charge Exchange alone (CE), but also BIC + CE coupled together using SteppingAction to avoid double neutron counting.

For this BIC+CE results, they actually have two sets of results: one using standard Geant4 BIC + CE models, using the available cross-sections for the two models, namely the Gheisha cross-sections for the CE model, and a second set of results where for the same BIC+CE models selection they use the ENDF proton data.

What I have noticed was that for the BIC+CE standard models (without ENDF data), it is not possible to reproduce their results.

I quote below the only reply I have received from the authors giving additional informations not mentioned in their papers:

"In our work, by modifying two member functions (the "BuildPhysicsTable" and the "GetElementCrossSection") of the G4ChargeExchangeProcess class, we used the corrected Geisha elastic cross-sections. In other words, we modified the "G4HadronElasticDataSet". The choice was made after several benchmarks. We found that if we use the original Geisha elastic cross-sections, the neutron yield for En = (32 ~ 33) MeV would be ~6.3x 10^9 (1/MeV/sr/microC), which is about 10 times larger than our results."

The same thing I found, i.e. using the standard Geant4 models and (Gheisha) cross-sections one cannot reproduce their published results (the ones without ENDF data). And I really don't know what they mean by "corrected Gheisha cross-sections".

If anyone knows what they could mean by this, please let me know.

Thank you,

Best regards,

Cristian

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