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Forum: Physics List
Re: Question Bias in target but not in detector (Cari C.)
Re: None Re: Bias in target but not in detector (Marc Verderi)
Date: 21 Aug, 2014
From: Cari C. <Cari C.>

I'm just interested in forcing the reaction in the target region, but need the proper distribution of events in the detector.

On Thu, 21 Aug 2014 14:37:03 GMT, Marc Verderi wrote:

> Hello,
> 
> There are some ways to do this, and with 10.0, you have new 
> functionalities that provide pretty much what you are interested in (see 
> examples/extented/biasing/GB02 as starting point, but we will need to 
> discuss a bit more to adapt to your case).
> Are you interested in the statistical weight as well or "just" in the 
> forcing of the interaction ?
> 
> Cheers,
> Marc
> 
> On 08/21/2014 04:28 PM, Cari C. wrote:
> > *** Discussion title: Physics List
> >
> > The issue I'm currently working on is wanting to bias a certain physics
> > process in my target for a fixed target simulation, but have no bias for
> > the rest of the simulation as the shower evolves in the detector.
> >
> > I want to bias G4eplusAnnihilation to get a 5 GeV positron beam hitting
> > a liquid hydrogen target to always result in 2 gamma annihilation.
> > Currently I modified the G4EmStandardPhysics.cc file to include a bias
> > on this process before adding it to a G4VModularPhysicsList. Since the
> > beam is much more energetic, I tried to place an energy cut at around
> > 4.8 GeV so that this process of e+e- -> 2gamma doesn't show up
> > incredibly biased--or at all in this case--in the detector built of may
> > CsI crystals.
> >
> > I've tried changing the cuts on the model, but when compiling, Geant
> > doesn't recognize the model. Perhaps this is a consequence of the model
> > being immediately invoked? (G4eeToTwoGammaModel)
> >
> > I also tried changing the physical properties of the target, but of
> > course that biased all the processes by the same factor and did not give
> > me the desired result.
> >
> > Ultimately I want to have a 2gamma event every time I turn on the beam,
> > and have all other normal EM processes occur in my detector.
> >
> > Is there a good way of going about this?
> >
> > -------------------------------------------------------------
> > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at:
> > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/phys-list/835.html
> 

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