[Gate-users] electron positron annihilation in 3 photons

[David Boersma]

Hi Meysam,

(Sorry, you get this twice, because I erroneously sent this to you personally instead of to the list.)

I'm afraid you are out of luck. Check the physics reference manual of Geant4:
http://geant4-userdoc.web.cern.ch/geant4-userdoc/UsersGuides/PhysicsReferenceManual/html/electromagnetic/electron_incident/annil.html

"The process G4eplusAnnihilation simulates the in-flight annihilation of a positron with an atomic electron. As is usually done in shower programs [NHR85], it is assumed here that the atomic electron is initially free and at rest. Also, annihilation processes producing one, or three or more, photons are ignored because these processes are negligible compared to the annihilation into two photons [NHR85][MC70]."

Looks like you will need a different simulation platform, something that is not relying on Geant4. Sorry!

HTH,
David
________________________________________
Von: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> im Auftrag von Meysam Dadgar <meysamdadgar10 at gmail.com>
Gesendet: Mittwoch, 5. Dezember 2018 11:32:30
An: gate-users at lists.opengatecollaboration.org
Betreff: [Gate-users] electron positron annihilation in 3 photons

hello dear Gate users
I have a question about electron positron annihilation, in physics process it seems that the annihilation of electron and positron in 3 or more photons disregard, is there any model to consider these photons also, because these photons are very important for me.
Best regards
Meysam
PhD student of Biophysics
Poland
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