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Pythia as external decayer for Geant3 [message #5192]

Thu, 11 October 2007 00:47

Mohammad Al-Turany
Messages: 518
Registered: April 2004
Location: GSI, Germany

first-grade participant

From: *dip.t-dialin.net

Hallo,

In SVN 1594, Pythia can be used as external decayer to Geant3, for Geant4 there is still some work to do before we can use it. To use this functionality, in the simulation macro you have to add the line:

fRun->SetPythiaDecayer(kTRUE);

after choosing the MC engine.

in the directory gconfig a new file is added, namely: G3DecayConfig.C, in this macro one can force geant3 to use Pythia as decayer for certain particles using the pdg code.

regards

Mohammad

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Re: Pythia as external decayer for Geant3 [message #18292 is a reply to message #5192]

Mon, 01 June 2015 14:34

asanchez
Messages: 350
Registered: March 2006

first-grade participant

From: 82.113.121*

Dear all,
We are simulating the transport of Xi minus particles via Geant4. Standard decay Modus is pion minus plus lambda. Nevertheless we are getting strange results in the output.
One of the reasons might be that some compound nucleus is formed leading to some fragmentation. But something catched my attention by looking into the settings of
Gconfig / gConfig4.C. It seems that pithia decayer was set as external decayer. In this case, I would like to know whether the default flag was set to true or false.

Thank you in advance
Alicia S.

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Re: Pythia as external decayer for Geant3 [message #18294 is a reply to message #18292]

Mon, 01 June 2015 15:43

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *ip71.fastwebnet.it

From g4Config.C:

41	   if(FairRunSim::Instance()->IsExtDecayer()){
42	      TVirtualMCDecayer* decayer = TPythia6Decayer::Instance();
43	      geant4->SetExternalDecayer(decayer);
44	   }

If you don't set the instance the external decayer should not be active.

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