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Forum: Particles
Re: Question Electron and nuclear collisions (Ken Sutherland)
Date: 25 May, 2004
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Mon, 24 May 2004, Ken Sutherland wrote:

> *** Discussion title: Particles
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/particles/65"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> I am a geant4 novis.
> 
> I have set up an experiment (based on EX02) in which 250 MeV protons are
> shot at water (50 cm cube).
> 
> Everything works fine. I can see the proton track (blue), hits (yellow),
> secondary e- tacks (red) and gamma tracks (green).
> 
> My professor now wants me to investigate how the energy is absorbed at
> each hit. Is there a way to determine if the proton has collided with an
> electron or the nucleus? Sometimes (rarely), the proton is deflected at
> a sharp angle. I assume that this is the result of the proton hitting a
> nucleus.
> 
> Also, is there a way to determine if the hit results in an outer-shell
> electron excitation or ejection of the water molecule?
> 
> I have been looking at TrackerSD::ProcessHits from various examples, but
> don't see how to do this.
> 
> Thanks!
> 

Hello,

Examples for similar tasks can be found out in 
examples/extended/electromagnetic
You need, book, store histograms and/or ntuples as it done in these tests.

VI 

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