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Forum: Physics List
Re: Question Questions about QBBC Physics List (Zach Miller)
Re: More Re: Questions about QBBC Physics List (Zach Miller)
Date: 12 Dec, 2014
From: michel maire <michel maire>

On Fri, 12 Dec 2014 16:25:27 GMT, Zach Miller wrote:
> I think I have answered my own question for question 1.
> 
> In order to match up with ENDF, I am having to multiply my (GEANT's)
> answer by the (atomic mass)/100. So for 1-H, I multiply by 0.01. For
> 16-O, 0.16. For 12-C, 0.12. I'm not sure why this factor is occurring in
> my GEANT results.  
> Any guidance on why this is behaving so strangely? 

 The problem is here : 
 G4BestUnit(dataStore->GetCrossSectionPerVolume(particle,en,process,material)/density,"Surface")
 crossSectionPerVolume/density is not a surface; it is a surface per mass (e.g. cm2/g)

 So correct statement is :
 G4BestUnit(dataStore->GetCrossSectionPerVolume(particle,en,process,material)/density,"Surface/Mass")

 You may have a look into G4UnitsTable in geant4/source/global/management

            Michel

> guidance on my second question in my previous post as well, I've found
> that the 12C inelastic cross-sections are also suffering from a similar
> problem to what I describe (averaging over wide energy ranges to get
> general behavior).

 I let the question to  QBBC experts

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