|Message: Re: Physics list for 1.8 MeV photons on Tungsten Absorber||Not Logged In (login)|
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for some reasons your attachment is not accessible (at least, to me).
in any case, for MeV gamma you likely need more accurate gamma physics, whatever hadronic physics does not matter. So, you need to use _EMY, _EMZ, _LIV, or _PEN extension of Physics Lists, for example, FTFP_BERT_EMY, or QBBC_EMY...
You may study situation in general using EM example : $G4INSTALL/examples/extended/electromagnetic/TestEm5
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