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None Changes in inelastic scattering. 

Forum: Hadronic Processes
Date: 26 Feb, 2008
From: Maxim Gonchar <Maxim Gonchar>

I simulated neutron propagation. Detector is cube 200x200x200 meters filled with oxygen.

I used physics list for neutrons:
   G4PreCompoundModel* thePreEquilib2;
   thePreEquilib2 = new G4PreCompoundModel(theHandler);
   thePreEquilib2->SetMinEnergy(20*MeV);
   thePreEquilib2->SetMaxEnergy(70*MeV);

   G4NeutronInelasticProcess* ninelProc = new G4NeutronInelasticProcess();
   G4NeutronInelasticCrossSection* neutron_XC =
                                   new G4NeutronInelasticCrossSection();
   ninelProc->AddDataSet(neutron_XC);

   G4NeutronHPInelastic* theNeutronHPInelastic = new G4NeutronHPInelastic();
   theNeutronHPInelastic->SetMaxEnergy(20.*MeV );
   G4NeutronHPInelasticData* theHPInelasticData = new
   G4NeutronHPInelasticData();

   G4LENeutronInelastic* LEPnModel = new G4LENeutronInelastic();
   G4double LEPUpperLimit = 25*GeV;
   G4double LEPpnpiLimit = 9.5*GeV;
   LEPnModel->SetMinEnergy(LEPpnpiLimit);
   LEPnModel->SetMaxEnergy(LEPUpperLimit);

   ninelProc->RegisterMe(theNeutronHPInelastic);
   ninelProc->AddDataSet(theHPInelasticData);
   ninelProc->RegisterMe(thePreEquilib2);
   pmanager->AddDiscreteProcess(ninelProc);

I was looking for energy loss in steps, defined by Inelastic scattering. When starting neutron energy is 19 MeV, i have discrete spectrum of energy loss by Inelastic, and it seems to be equal for both version of Geant4 (4.8, 4.91). But when I run neutrons with energy of 21 MeV spectrum differs. Geant4.8 has a great peak in energy < 4 MeV. It seems very strange for me, because I didn't find anything about such changes.

regards, Maxim Gonchar

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1 None: Re: Changes in inelastic scattering.   (Dennis H. Wright - 13 Mar, 2008)
(_ None: Re: Changes in inelastic scattering.   (Maxim Gonchar - 14 Mar, 2008)
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