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Forum: Hadronic Processes
Re: None Neutron Angular Distribution with LElastic Model (B R)
Re: None Re: Neutron Angular Distribution with LElastic Model (Vladimir IVANTCHENKO )
Re: Agree Re: Neutron Angular Distribution with LElastic Model (B R)
Date: 20 Jun, 2007
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Wed, 20 Jun 2007, BrianR wrote:

> *** Discussion title: Hadronic Processes
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/hadronprocess/717/1/1"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> To Vladimir Ivantchenko,
> 
> Thank you for your suggestion for the possible solution to the problem
> mentioned previously. My initial tests of the G4QElastic Process with
> the neutron scattering in my simulation have produced good results, and
> it appears that the angular distribution of the neutrons that scatter
> from the detector no longer has this strange peak that I mentioned in
> the previous message, although the shape of the angular distribution has
> changed from a exponetial distribution to a gaussian distribution. I
> assume this is a normal result with this model? (In fact, a gaussian
> shape is better for my application for comparison with results from
> other simulation programs...).
> 
> I have two other questions related to your response to the previous
> questions: First, is it perhaps better to use the Binary Cascade or
> Bertini Cascade models for the neutron inelastic scattering instead of
> the PreCompound model? (for neutrons between about 1 MeV ant 100 MeV?)
> You mentioned that the Binary Cascade model calls the PreCompound model
> at 30 MeV, but perhaps this only happens at low energy? As usual, I
> would like the inelastic scattering model that would be closest to
> "reality" so I was wondering when the Cascade models begin to be
> different than the PreCompound model?
> 
> Second, I was curious to know if there was any way to control the shape
> of the elastic scattering angular distribution in the G4QElastic model?
> Could a user, in principle, modify part of the code in the model to
> change the width of the Gaussian distribution or the shape?
> 
> Thanks again for your help, BrianR.
> 

Hello Brian,

I was avatising Binary cascade because for light fragments like deuteron, 
alpha, ... futher simulation will be more precise than in LHEP models.
For neutron incident 1-100 MeV I would use PreCompound or Binary if your 
are using 8.X seria of geant4. With 9.0 probably Bertini can be also 
considered.

About options and modification of model parameters - not such obvious for
today. For G4QElastic you can contact real author Mikhail Kosov. Binary
parameters are reasonably optimised, I would not play with Binary options,
but you can also contact main author Gunter Folger.  For PreCompound there
are options, for today better to post questions in HyperNews if you want
to play with.

regards,
Vladimir

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