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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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