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Question PhotoNeutron Cross Section Doubled 

Forum: Hadronic Processes
Date: 29 Jul, 2009
From: Kyle Pastor <Kyle Pastor>

Hello all,

I am simulating the photo-neutron production of Bi-209 using a 4pi detector set up. In my physics list I have included only PhotoNuclear interactions:

theParticleIterator->reset();

while( (*theParticleIterator)() ){

	G4ParticleDefinition* particle = theParticleIterator->value();
    	G4ProcessManager* pmanager = particle->GetProcessManager();
    	G4String particleName = particle->GetParticleName();

    	if (particleName == "gamma") {

G4PhotoNuclearProcess* pnp = new G4PhotoNuclearProcess("PhotoNuclearProcess");

G4GammaNuclearReaction* gnr1 = new G4GammaNuclearReaction();
gnr1->SetMaxEnergy(0.5*GeV);
pnp->RegisterMe(gnr1);
 pmanager->AddDiscreteProcess(pnp);

This means all neutrons that I detect are directly from the photo-neutron reaction. The problem is when I calculate the total cross section from the simulation and compare it to the G4PhotoNuclearCrossSection data tables I am getting twice the correct cross section. I have done this for a range of energies and it is always twice. I am using energies in the range of 7-9MeV. I am wondering if anyone has any ideas what this could be caused by.

Thanks -Kyle

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1 Idea: Re: PhotoNeutron Cross Section Doubled   (Vladimir Ivanchenko - 10 Aug, 2009)
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