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Forum: Physics List
Re: Question Bias in target but not in detector (Cari C.)
Date: 21 Aug, 2014
From: Marc Verderi <Marc Verderi>

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?
>
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1 None: Re: Bias in target but not in detector   (Cari C. - 21 Aug, 2014)
2 None: Re: Bias in target but not in detector   (Cari C. - 22 Aug, 2014)
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