Hi Denis,
To enable delta rays in Geant3, you have to
set flags in g3Config.C
gMC->SetProcess("DRAY",1);
gMC->SetProcess("LOSS",1);
In Geant4, delta rays are produced by default.
To get comparable results, you should run both
G3 and G4 with the same cuts. This is a bit tricky,
as G4 uses cuts in range per particle while
G3 cuts in energy per tracking medium.
In VMC, you can set cuts in energy via
TVirtualMC::Gstpar() function
(have a look at Ex03DetectorConstruction class in
E03 example)
To take these cuts setting into account by Geant4,
you have to activate the TG4SpecialCuts process,
by adding:
/mcPhysics/setSpecialCuts true
in Geant4 configuration macro (g4config.in).
(This command is defined via Geant4 VMC default
physics list; if you use your own G4 physics list
this command is not available;
then you will have to register the
TG4PhysicsConstructorSpecialCuts physics in it.)
Best regards,
Ivana
==============================================================
e-mail: Ivana.Hrivnacova@cern.ch
address: Institut Physique Nucleaire, 91406 Orsay, France
phone: (33) 01 69 15 65 94
==============================================================
On Wed, 14 Jan 2004, Denis Bertini wrote:
> Hi
> I would like to study the production of delta-electrons when shooting a
> AU gold ion beam through
> an AU thin target.
> I am using VMC for that. and the new functionality DefineIon(...);
> Now i would like to know what should be my setup (G3_G4Config.C) for
> Geant3 and Geant4 in order to be able to
> compare what VMC_Geant3 and VMC_Geant4 gives ?
> Thanks,
> Denis Bertini
>
>
>
>
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