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Forum: Physics List
Re: Question Changes for heavy ions in in G4.9.2.p02? (Daniel Matthiń)
Re: None Re: Changes for heavy ions in in G4.9.2.p02? (michel maire)
Date: 28 Oct, 2009
From: Daniel Matthiń <Daniel Matthiń>

On Wed, 28 Oct 2009 07:10:21 GMT, michel maire wrote:
> On Tue, 27 Oct 2009 10:48:06 GMT, Daniel Matthi&#65533; wrote:
> > Hello all, I have a problem after switching from G4.9.1.p02 to
> > G4.9.2.p02 in the transport calcultions of heavy ions. I recognized a
> > dramatic change in the ranges of iron ions at high energies.
> > Specifically I calculated the range for Fe56 at an energy of 500MeV/nuc
> > (28GeV) using the G4EmStandardPhysics list. The CSDA range in water in
> > this case is 97.4mm calculated with G4.9.1.p02 which is reasonable but
> > 204.3mm calculated with G4.9.2.p02! What is the reason for this change?
> > Do I have to use a different physics list? In the creation of my physics
> > list I followed the example extended/field/field04. Regards, Daniel
> > 
>  I have checked Fe56 range with TestEm0 and TestEm7. It is still around 96 mm
>  (extended/electromagnetic)
>      Michel

Dear Michel,

I found out that the problem is not in the physics list but in the material. I used the G4NistManager to obtain the definition for water:

G4NistManager *nistMan = G4NistManager::Instance(); G4Material* nWater = nistMan->FindOrBuildMaterial("G4_WATER");

If I also use that in the TestEM0 example I end up with the large range for iron.


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1 Agree: Re: Changes for heavy ions in in G4.9.2.p02?   (Vladimir Ivanchenko - 28 Oct, 2009)
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