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Question Kinetic energy of electrons in a gas at their creation -- density dependency?!? 

Forum: Event and Track Management
Date: 27 Sep, 2016
From: Francesca <Francesca>

Hello.

I have protons of 90 MeV passing in a gas composed of CO2, CO, N2 and H2.

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.

For this, when I "register" the event in EventAction, I ask that every step of the event is saved. In particular, I ask to save:

--

evtNo = evt -> GetEventID();

stepNb = step->GetTrack()->GetCurrentStepNumber();

KinEn = step -> GetPreStepPoint() -> GetKineticEnergy()/eV;

particleName = (aStep -> GetTrack() -> GetDynamicParticle()-> GetDefinition() -> GetParticleName());

--

When I process the results, I make a histogram of the KinEn and fill it only if the particleName is "e-" and the "stepNb" is 1 (so that I am sure I am looking at the PreStep kinetic energy of the electron at its first step, which I think should be the kinetic energy it has when it is 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.

Am I looking at the wrong quantity, pls? How can I get the initial kinetic energy with which the electrons are created, pls?

Thanks, regards, franciuska

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/09/27/08.00-86289-1g.pdf
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/09/27/08.00-60065-005g.pdf

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1 Feedback: Re: Kinetic energy of electrons in a gas at their creation -- density dependency?!?   (Gumplinger Peter - 29 Sep, 2016)
1 Ok: Re: Kinetic energy of electrons in a gas at their creation -- density dependency?!?   (Francesca - 30 Sep, 2016)
2 Ok: Re: Kinetic energy of electrons in a gas at their creation -- density dependency?!?   (Francesca - 30 Sep, 2016)
2 None: Re: Kinetic energy of electrons in a gas at their creation -- density dependency?!?   (michel maire - 02 Oct, 2016)
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