|Message: Re: Kinetic energy of electrons in a gas at their creation -- density dependency?!?||Not Logged In (login)|
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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