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Disagree Re: Scintilation from uncharge particles 

Forum: Processes Involving Optical Photons
Re: None Scintilation from uncharge particles (John Watts)
Date: 04 Jan, 2013
From: Gumplinger Peter <Gumplinger Peter>

Hi John,

> I'm simulating optical photons in a neutron detector. I've notice that I
> have neutron trying to produce optical photons in geant4.9.6.

Are you telling me that you didn't see this in a previous version of Geant4? Though, nothing in this regard has changed from previous versions to 9.6.

> G4Scintillation::IsApplicable only rejects short-lived particles and
> optical photons. It passes uncharge particles. Why don't it reject
> uncharged particles like G4Cerenkov::IsApplicable? Is this a bug?

No, it is not a bug - it's deliberate! Neutral particles can generate charged particles that are below your production threshold. If they do, these charge particles are not tracked although their kinetic energy might be such that if they were tracked they'd generate scintillation photons. Since the kinetic energy of such a sub-production-cut charged particle is attributed as an energy loss of the primary neutral particle, neutral particles with energy loss in the medium MUST produce scintillation photons for the scint. yield to be correct.

Best regards, Peter

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