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Re: Difference of neutral candidate between Geant4 and Geant3 [message #15835 is a reply to message #15624] Thu, 06 February 2014 11:56 Go to previous messageGo to previous message
Dima Melnychuk is currently offline  Dima Melnychuk
Messages: 213
Registered: April 2004
Location: National Centre for Nucle...
first-grade participant
From: *fuw.edu.pl
Hi,

As Stefano suggested I tried to compare the number of neutral candidate between Geant 3 and Geant 4 with different "hadronic process" setting for Geant 3. The default value for "hadronic process" in /gconfig/SetCuts.C is 1.
gMC->SetProcess("HADR",1);

I tried "3" and "5" and with "5" simulation stuck. But actually between "hadronic process" "1" and "3" with respect to number of neutral candidates there is no much difference.

So the results for 15 GeV DPM events.
index.php?t=getfile&id=7679&private=0
Multiplicity for Geant 4 is much lower, and almost no difference between different "hadronic process" in Geant3.

Distribution of cluster size (number of crystals per cluster)
index.php?t=getfile&id=7680&private=0
indicate 2 times difference in single cluster crystals between Geant3 and Geant4.

And if we consider the multiplicity of neutrals with more than 2 crystals:
index.php?t=getfile&id=7681&private=0
there is already a reasonable agreement between Geant3 and Geant4.

And still there is no conclusion which engine is more correct Geant3 or Geant4.

Dima

 
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