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Forum: Hadronic Processes
Re: Question Choosing the Elastic Process (Katherin Shtejer Diaz)
Date: 30 Nov, 2007
From: Vladimir IVANTCHENKO <>

On Wed, 28 Nov 2007, Katherin Shtejer wrote:

> *** Discussion title: Hadronic Processes
> Email replies to must include:
>   In-Reply-To: <"/hadronprocess/847">
>   Subject: ...change this to be about your reply.
> Hello,
> I need some advice about choosing one of the elastic processes present
> in Geant4. I am working now with Geant4.9.0.p01 and I see there are the
> following relatively new processes: G4UHadronElasticProcess and
> G4QElastic, which I suppose are more updated than the
> G4HadronElasticProcess one (am I wrong?). My application is intended to
> simulate protons from 60 MeV to 300 MeV in water and some plastic
> materials for medical physics. The use of the available hadronic models
> to describe the nuclear interactions (Intranuclear Cascade +
> Evaporation) is rather clear for me, but taking into account the
> importance of the Bragg peak parameters (i.e. peak width) in my
> application, the selection of the correct elastic process is crucial.
> Could somebody give me some guideline about the strengths and possible
> weaknesses of these elastic processes in the way as they were set up in
> Geant4, and the differences between them?
> I would appreciate any help.
> Thank you very much,
> Katherin

Hello Katherin,

We are working on web documentations about physics lists and hope that it 
will be significantly improved. Now I am trying to clear some points.

For proton incident below 300 MeV G4UHadronElasticProcess and G4QElastic
are equivalent or very close to each other since G4 release 8.3, at least.

We usually propose users do not construct Physics Lists by themself but to
use our predefined Physics Lists or constructors (builders) from
$GINSTALL/source/physics_lists/builders library. So, your can choose
between G4HadronElasticPhysics and G4HadronQElasticPhysics. I would
suggest to try both with expectation of very similar results.


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