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Re: Question Cf 252 Neutron Source (Eric)
Date: 19 Jul, 2011
From: Michael H. Kelsey <Michael H. Kelsey>

On Tue, 19 Jul 2011 23:06:05 GMT, Eric wrote:
> I need to define a Cf 252 neutron source, and haven't been successful.
> In previous sims, I've been dealing mostly with monoenergetic things
> (ie, Cs137, I would just define a 662 kev gamma and call it good), but
> there should be a range of values for Cf 252.
> 
> I've defined the source using something like:
> ----------------------------------------------------
> particleGun->SetParticleEnergy(some value*eV);
> particleGun-> SetParticlePosition(G4ThreeVector(0.,0.,0);
> particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1));
> 
> G4int Z=98, A=252;
> G4double ionCharge = 1.*eplus;
> G4double excitEnergy= 0.*keV;
> 
> G4ParticleDefinition* ion =
> G4ParticleTable::GetParticleTable()->GetIon(Z,A,excitEnergy);
> particleGun->SetParticleDefinition(ion);
> particleGun->SetParticleCharge(ionCharge);
> 
> particleGun-> GeneratePrimaryVertex(anEvent);
> ----------------------------------------------------
> 
> Which gives me an ion, in the simulation, of Cf252, but doesn't emit a
> range of low energy neutrons. I haven't found a good example showing how
> to do this... anyone have any insight?

Take a look at examples/extended/radioactivedecay/rdecay01. You need to have included G4RadioactiveDecay in your PhysicsList, and you need to enable it for your geometry (either all volumes or just your source).

-- Michael Kelsey

> 
> Thanks!
> 
> -Eric
> 

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1 None: Re: Cf 252 Neutron Source   (Michael H. Kelsey - 06 Oct, 2011)
(_ None: Re: Cf 252 Neutron Source   (michel maire - 07 Oct, 2011)
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