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Forum: Physics List
Re: Question strange phisics results (Bruno Zerbo)
Date: 20 Feb, 2014
From: michel maire <michel maire>

On Wed, 19 Feb 2014 16:45:50 GMT, Bruno Zerbo wrote:
> Hi to all,
> I'm doing some simulations to calculate the energy deposited by
> electrons of different energy in a silicon layer 1 mm width.
> 
> I developed the code starting from the ones in
> examples/extended/electromagnetic/TestEm1
> my detector construction make a world filled by vacuum in which there is
> a layer of silicon.
> 
> Electrons are shot with energy varying form 0.5 MeV to 5.5 MeV.
> Before I send 1000000 of electrons of 0.5 MeV and I fill an histogram,
> then I repeat with energy of 0.75 MeV and I fill another histogram...
> and so on until 5.5 MeV.
> 
> These histograms are very strange and something is not going right.
> 
> 
> I attached some pictures of the histograms plotted. In each of these you
> can see a straight line in coincidence with the energy of the electrons
> shot to the silicon. I think that this behaviour is not physical and I
> can't explain what is coming. 

 Energy conservation. If e- is totally absorbed, total energy deposit = E incident.

 I reproduced your setup with TestEm5. 
 1MeV.jpeg is 2 e- incidents. 1 is transmitted, 1 is totally absorbed --> 1 MeV

 Also, I attach macro and histo at 4 MeV. You can play with this TestEm5 and compare with your results.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/20/06.45-89321-1MeV.jpeg
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/20/06.45-27617-bruno.mac.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/20/06.45-83593-4MeV.gif

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