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None Re: Giant Dipole Resonance photo-neutron production in medical linac 

Forum: Hadronic Processes
Re: Question Giant Dipole Resonance photo-neutron production in medical linac (Alessandro Berra)
Re: None Re: Giant Dipole Resonance photo-neutron production in medical linac (Dennis H. Wright)
Date: 22 May, 2013
From: Alessandro Berra <Alessandro Berra>

On Tue, 21 May 2013 17:24:04 GMT, Dennis H. Wright wrote:
> Just to clarify: you're using electrons to produce gammas, which in turn
> interact with a material? Are you using Geant4 9.6? From version 9.6
> onward, in FTFP_BERT_HP, the Bertini cascade is assigned to
> G4PhotoNuclearProcess which allows it to handle the giant dipole
> resonance,and therefore should produce neutrons. Before version 9.6 this
> is not the case.
> 

Yes, I am using electrons impinging on a tungsten target that generate gammas, which in turn generate neutrons. Geant 4.9.6.p01 version. Probably the problem is that, due to the bremsstrahlung emission, a lot of gammas have low energies (under 6 MeV), not enough to interact through GDR.

I will try to generate directly a bremsstrahlung spectrum between 6 and 18 MeV and see what happens.

I have another question: can I disable some gamma processes (for example pair production) in order to speedup the neutron production?

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1 None: Re: Giant Dipole Resonance photo-neutron production in medical linac   (michel maire - 24 May, 2013)
(_ Idea: Re: Giant Dipole Resonance photo-neutron production in medical linac   (Vladimir Ivanchenko - 26 May, 2013)
(_ None: Re: Giant Dipole Resonance photo-neutron production in medical linac   (Alessandro Berra - 27 May, 2013)
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