<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
Hi Elfatih,
<p>Concerning the production of one or 3 (or more...) photons after a e+e-
annihilation :
<p>You can find some informations in the G4eplusAnnihilation class (source/processes/electromagnetic/standard/
include or src) like this one :
<p>//
<br>// Note 2: The annihilation processes producing one or more than two
photons are
<br>// ignored, as negligible
compared to the two photons process.
<br>//
<br>So this is a Geant4 "cut" and not a specificity of GATE.
<p>If you want to include a new gamma production after annihilation, you
need to develop your specific class from G4eplusAnnihilation.
<p>Hope this helps
<p>Seb
<br>
<pre>--
Sebastien JAN - CEA DSV/DRM/SHFJ
4 pl. Général Leclerc Tel (33) 01 69 86 78 21
91406 Orsay France Fax (33) 01 69 86 77 49
--</pre>
</html>