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Dear colleagues, We are currently using Geant4.10.02 as MC package for our DAMPE detector, a multi-purpose astrophysics experiment capable of detecting gamma-rays and electrons from ~ GeV - 10 TeV and protons/ions with primary energies of up to 100 TeV (https://arxiv.org/abs/1706.08453). So far we have been using the physics list: QGSP_FTFP_BERT as our default for hadronic physics. Following the reference page: http://geant4.cern.ch/support/proc_mod_catalog/physics_lists/referencePL.shtml I can find the various options, e.g. QGSP_BERT and FTFP_BERT, but unless i'm mistaken, the two are mutually exclusive, since one uses the quark-gluon string model (QGSP) whereas the other uses the Fritiof string model (FTFP). This leaves me puzzled, since V. Ivantchenko commented in a private email exchange that "FTFP_BERT is Geant4 default but we think QGSP_FTFP_BERT can be considered for astrophysical applications", so apparently we are using 'the best available' physics list. But what I can't find anywhere is what exactly QGSP_FTFP_BERT is and how it e.g. should be prefered over FTFP_BERT or QGSP_BERT, especially in the context of physics up to E~100 TeV. Could you please help clear up my confusion? Thank you very much for your help! Regards, -Stephan -- Stephan Zimmer DPNC, University of Geneva, Switzerland
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