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Forum: Event and Track Management
Re: Question Kinetic energy of electrons in a gas at their creation -- density dependency?!? (Francesca)
Date: 02 Oct, 2016
From: michel maire <michel maire>

On Tue, 27 Sep 2016 15:11:05 GMT, Francesca wrote:
> Hello.
> 
> For now I shoot protons of 90 MeV along the z direction. I want to know
> the initial kinetic energy with which the elctrons are generated.
> 

> I obtain a histogram, for a certain density (density = 1 g/cm3) as
> reported on the attachment called *1g.pdf.
> 
> If then I change the gas density, the histogram completely changes (ex.
> for a gas density of 0.05g/cm3, the result is reported in the attached
> image called *005g.pdf).
> 
> But I think that the energy with which an electron is emitted depends on
> the incident particle energy and on the gas composition, not on its
> density.

  It is strange that a material ~100 time less dense gives ~5 time more ionisation ...
  I suspect that did not played with the density, but with the production threshold (aka cut).

  You may wish to play with TestEm5 and the attached macro.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/10/02/02.04-5039-francesca.mac.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/10/02/02.04-90183-cut100um.gif
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/10/02/02.04-31822-cut1um.gif

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