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Forum: Hadronic Processes
Re: Question QMD clustering (George Dedes)
Date: 10 Sep, 2012
From: George Dedes <George Dedes>

Any ideas on that issue? George

On Wed, 18 Jul 2012 16:25:57 GMT, George Dedes wrote:

> Hi all,
> 
> I've been using for quite some time now the QMD model in medical application 
> mainly carbon beam in water or PMMA) and I have the following question:
> 
> Looking at the literature of different QMD flavors as well as the JAERI QMD 
> implemented in GEANT4, I noticed that the stand alone codes do not refer to the 
> clustering distance used in GEANT4 (Geant4/processes/hadronic/models/qmd/src/G4QMDMeanField.cc). 
> This is by default set to 4fm. So my question is, how the default value was 
> selected? This seems to influence the secondaries of the reaction and also the 
> gammas that I am personally interested in. 
> 
> Why not using a lower clustering distance one or a much higher and let a big 
> composite nucleus be handled by the deexcitation for example? So was the 
> clustering criterion benchmarked with some data?
> 
> Thanks in advance for the answer,
> George
> 

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