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Forum: Processes Involving Optical Photons
Re: Question Scintillation with an alpha source (Amy M)
Date: 23 Jan, 2014
From: Gumplinger Peter <Gumplinger Peter>

Hi Amy,

> I am trying to simulate the generation of optical photons through an
> alpha source interacting with a scintillator. As of now, I do not get
> any optical photons generated with an alpha source, however when I
> change it to a gamma source, I do get optical photons. What might the
> reason for this be? Are there physics processes I need to include when
> using an alpha source?

As with all processes, the G4Scintillation process needs to be added to the G4Alpha particle's process manager. It depends on your physics list (PL). If you define the G4Alpha and the G4Scintillation process 'by hand' you've got to add code as in:

http://www-geant4.kek.jp/lxr/source/examples/extended/field/field04/src/F04OpticalPhysics.cc#L111

or

http://www-geant4.kek.jp/lxr/source/examples/extended/optical/OpNovice/src/OpNovicePhysicsList.cc#L239

If you employ G4OpticalPhysics as in the /examples/extended/optical/LXe example, this will be done automatically for you.

http://www-geant4.kek.jp/lxr/source/examples/extended/optical/LXe/src/LXePhysicsList.cc#L60

The only particles that return 'false' for G4Scintillation::IsApplicable are short lived particles (which the G4Alpha is not) and optical photons, see:

http://www-geant4.kek.jp/lxr/source/examples/extended/optical/LXe/src/LXePhysicsList.cc#L60

Peter

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