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Question strange phisics results 

Forum: Physics List
Date: 19 Feb, 2014
From: Bruno Zerbo <Bruno Zerbo>

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. For example for energy 5.25 MeV there is a small line in the last part of the histogram... for energy that become smaller and smaller this line grow. For low energy I get only the straight line how if all particles were totally absorbed but there is not a curve, it is a discontinuity point!
can someone explain me?
I used livermore physics list and also the standard one bat nothing change; I also played with the range cut... but nothing

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/19/08.33-2581-schermata1.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/19/08.33-42240-schermata2.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/19/08.33-75005-schermata3.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/19/08.33-98477-schermata4.png

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1 More: Re: strange phisics results   (A. Hod - 19 Feb, 2014)
1 None: Re: strange phisics results   (Bruno Zerbo - 19 Feb, 2014)
2 None: Re: strange phisics results   (Daren Sawkey - 19 Feb, 2014)
1 None: Re: strange phisics results   (Bruno Zerbo - 19 Feb, 2014)
2 None: Re: strange phisics results   (Bruno Zerbo - 21 Feb, 2014)
1 None: Re: strange phisics results   (Daren Sawkey - 21 Feb, 2014)
3 None: Re: strange phisics results   (michel maire - 20 Feb, 2014)
1 None: Re: strange phisics results   (Bruno Zerbo - 21 Feb, 2014)
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