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Question Giant Dipole Resonance photo-neutron production in medical linac 

Forum: Hadronic Processes
Date: 21 May, 2013
From: Alessandro Berra <Alessandro Berra>

Hello everyone,

I want to simulate the spectrum of neutrons produced inside e medical linac due to Giant Dipole Resonance. I have simulated the linac tungsten target, the primary and the secondary tungsten collimators and a 18 MeV electron source directed to the target.

At the moment I have loaded the FTFP_BERT_HP physics list and I have replaced the G4EmStandardPhysics builder of the list with the G4EmStandardPhysics_opt3 which, according to the physics list page of geant4, is optimized for medical applications.

I have started the simulation, but almost no neutrons are produced. After some digging I have discovered that the Giant Dipole Resonance process is described by a G4PhotoNuclearProcess, and the corresponding model is G4GammaNuclearReaction. Unfortunately, looking at the FTFP_BERT_HP and G4EmStandardPhysics_opt3 builders I can't see this process activated for gammas.

Am I missing something? After a particle/process/dump for gammas I can see that some kind of HadronInelastic process is activated, but I don't understand what process it is...

Thanks for your help and suggestions!

Alessandro Berra

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1 None: Re: Giant Dipole Resonance photo-neutron production in medical linac   (Dennis H. Wright - 21 May, 2013)
(_ None: Re: Giant Dipole Resonance photo-neutron production in medical linac   (Alessandro Berra - 22 May, 2013)
(_ 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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