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Question Problem with overlapping models for nCapture 

Forum: Hadronic Processes
Date: 26 Jun, 2018
From: Arianna <Arianna>

Hello, I'm having troubles with some simulations of neutron generation driven by moderate energy protons in a pitcher-catcher configuration.

I started from the example in geant4.10.04.p02/examples/extended/hadronic/NeutronSource and modified it to my needs.

From previous works I know that the data-driven model implemented in G4HadronPhysicsQGSP_BIC_AllHP works better than G4HadronPhysicsQGSP_BIC_HP. So, basically, I replaced G4HadronPhysicsQGSP_BIC_HP with G4HadronPhysicsQGSP_BIC_AllHP in the of the example.

The problem is that using a LiF proton-neutron converter, I often get the following error (it didn't happen with Be or Li):

-------- EEEE ------- G4Exception-START -------- EEEE -------
*** G4Exception : had005
      issued by : G4HadronicProcess::PostStepDoIt
In /geant4.10.04.p01/source/processes/hadronic/management/src/, line 149: 
===> GetHadronicInteraction: Energy ranges of two models fully overlapping
Target element F  Z= 9  A= 19
Unrecoverable error in the method ChooseHadronicInteraction of nCapture
TrackID= 2  ParentID= 1  neutron
Ekin(GeV)= 0.000875406;  direction= (0.238566,-0.631628,-0.737653)
Position(mm)= (1.3317,-5.29241,-2.13383);  material G4_LITHIUM_FLUORIDE
PhysicalVolume  <Target>
 No HadronicInteraction found out

*** Fatal Exception *** core dump *** -------- EEEE -------- G4Exception-END --------- EEEE -------

My question is: how do I know which models are overlapping and how do I change the min/max energies in order to remove the overlapping, but still have a reliable simulation?

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1 None: Re: Problem with overlapping models for nCapture   (michel maire - 29 Jun, 2018)
1 Idea: Re: Problem with overlapping models for nCapture   (Vladimir Ivanchenko - 03 Jul, 2018)
(_ None: Re: Problem with overlapping models for nCapture   (michel maire - 08 Jul, 2018)
2 None: Re: Problem with overlapping models for nCapture   (michel maire - 04 Jul, 2018)
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