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Idea Re: AlongStep DoIt ordering for G4eplusAnnihilation process 

Forum: Physics List
Re: Question AlongStep DoIt ordering for G4eplusAnnihilation process (Maria Gatu Johnson)
Re: Idea Re: AlongStep DoIt ordering for G4eplusAnnihilation process (Vladimir Ivanchenko)
Re: Question Re: AlongStep DoIt ordering for G4eplusAnnihilation process (Maria Gatu Johnson)
Date: 19 Dec, 2008
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

Hello Maria,

Since release 5.X many things have been improved in Geant4, in particular, in hadronic physics. The way you configure Physics Lists is not optimal anymore and you hardly see the same code in major current G4 examples.

If you need neutron physics of moderate energies, the simplest solution for 9.X Geant4 version is to use the reference Physics list QGSP_BIC, which is provided now with the toolkit. You not need to create your own class at all. If you need detailed neutron transport below 20 MeV, there are alternative variants, for example, QGSP_BIC_HP. Note, that the computations will be slower with the HP sub-package. Your vaiant of is similar to the LHEP Physics List, which is the fastest but cannot garantee detailed simulation on event by event base.

How to use reference Physisc Lists one can see in $G4INSTALL/examples/novice/N04/exampleN04.cc

VI

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