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Forum: Physics List
Re: Question 30 keV protons: delta ray production on thin carbon foil (Emil Frlez)
Date: 10 Jun, 2011
From: michel maire <michel maire>

On Sun, 05 Jun 2011 14:22:48 GMT, Emil Frlez wrote:
>  Hi GEANT4 experts -
> 
>  I am using the geant4.9.4/examples/extended/electromagnetic/TestEm5/
>  as a template. I start with ~30 keV protons that I would like to shoot thru
>  a 1E-4*mm thick carbon foil. I would like to count and track the delta ray   
>  electrons ejected from the foil by going-thru protons.
> 
>  Looking at my PhysicsList.cc it appears that the delta ray production
>  by protons is not included and, indeed, my protons produce no electrons
>  passing thru the foil (only StepLimiter, Transportation, msc, hIoni appear
>  as processes).  I was trying to google the G4 forums and the rest
>  of the web, attempting to find an example of how to add delta ray production
>  by hadrons to my Physics List, but was unable to find anything that would
>  help me (I assume I just have to add a few lines in the PhysicsList.cc?
> 
  For a proton of 30 keV, the maximum energy transferable to an e- is Tmax= 65 eV.
  Minimal production threshold of standard em processes is 1 keV, and 250 eV for lowEnergy extension.  
   No chance to produce d-rays !

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