Message: Re: How does G4 deal with the overlap energy range between the different physical models? Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

None Re: How does G4 deal with the overlap energy range between the different physical models?  

Forum: Physics List
Re: Question How does G4 deal with the overlap energy range between the different physical models? (liyong)
Date: 11 Jul, 2016
From: Marc Verderi <Marc Verderi>

Dear Liyong,

When two models overlap in energy, the "trick" Geant4 uses is to 
randomly select one or the other, with a probability which is linear 
with energy : that is, if the energy is close to model A, model A will 
be used often; if the energy is in the middle of the energy range 
overlap, then models A and B will be chosen in 50% of the cases each; 
and when the energy is very close to model B, model B will almost always 
be used.

Of course, this is not perfect, but a correct treatment would require a 
model that would be able to handle the overlap between the two energy 
regimes, meaning that, likely, this model would be advanced enough to 
handle the total energy range of these two regimes.

Cheers,
Marc



On 12/07/2016 05:09, liyong wrote:
> *** Discussion title: Physics List
>
> Dear all,
>
> I include the physical processes "G4HadronPhysicsQGSP_BIC_HP" in my
> simulation and it shows me that the model "Binary Cascade", "FTFP" and
> "QGSP" play major roles in the energy range of incident proton of 0MeV -
> 9.9GeV, 9.5GeV - 25GeV and 12GeV - 100TeV, respectively. I want to know
> how does G4 deal with the overlap energy range between the different
> physical models? For example, if the energy range of incident proton is
> 9.5-9.9GeV, which physical model to choose in G4?
>
> Thank you in advance!
>
> Liyong
>
> -------------------------------------------------------------
> Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at:
> http://hypernews.slac.stanford.edu/HyperNews/geant4/get/phys-list/940.html

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 Agree: Re: How does G4 deal with the overlap energy range between the different physical models?   (liyong - 11 Jul, 2016)
 Add Message Add Message
to: "Re: How does G4 deal with the overlap energy range between the different physical models? "

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]