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Forum: Physics List
Re: None possible bug? (Bari Osmanov)
Date: 21 Mar, 2008
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Fri, 21 Mar 2008 barry_osm@yahoo.com wrote:

> *** Discussion title: Physics List
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/phys-list/466"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
>  Hello, I am simulating production of neutrinos from the interaction of 1 Gev protons with mercury target.
>  I am using precompiled list "QGSP_BIC". One of the processes is the production of negative pions which decay to negative muons.
>  This negative muons can undergo capture or decay processes. If it is a capture, the mu- should produce muon neutrino; when it decays - 
> it produces muon neutrino and electron anti-neutrino. In my SteppingAction, I have written the code which, upon finding electron anti-neutrino, 
>  allows to pick out the process that created it. Here is the piece of the code:
> 
>   G4Track* track = aStep->GetTrack();
>   const G4VProcess *creator_process = track->GetCreatorProcess();
>   G4String creator_process_name = creator_process->GetProcessName();  
> 
>  Then, I print this info out. And here is what I got for one found electron antineutrino:
> 
> anti_nu_e (trackID=438, status='Alive'): step proc='Transportation' in
> Volume='physical_UpBePlug' at position=(34.967185, 31.234776,
> -1.5152518) cm Name of creator process:muMinusCaptureAtRest
> 
>  I.e. it looks like electron antineutrinos are produced in mu- capture.
> 
>  I will appreciate if someone will write his/her ideas about this. Maybe I am doing something wrong in the SteppingAction...
> 
>  Thank you,
> 
>  Bari.
>  

Hello,

This process produce both mu- capture and decay of mu- at muonic atom. In 
this particular event you will have alos e- and another neutrino.

VI 

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