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Forum: Event and Track Management
Re: Question Force energy change in the SteppingAction (Luciano Pandola)
Date: 13 Apr, 2005
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Wed, 13 Apr 2005, Luciano Pandola wrote:

> *** Discussion title: Event and Track Management
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/eventtrackmanage/304"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hello,
> 
> I would like to know whether is possible to force the change of energy
> of a given particle in the SteppingAction(), keeping all the other
> parameters (polarization, momentum direction) unchanged. I tried with
> 
> step->GetTrack()->SetKineticEnergy(myEnergy);
> 
> but it seems to me that the new information is ignored.
> 
> Thank you for your help, Luciano
> 

Hello Luciano,

I all user actions parameter is "const G4Track", so user cannot change it. 
Only PhysicsProcess can do that. Thus, for your purpose you can create a 
process whihc will do what you need.

VI

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