GSI Forum: Monte Carlo Engines » Difference of neutral candidate between Geant4 and Geant3

Home » PANDA » PandaRoot » Monte Carlo Engines » Difference of neutral candidate between Geant4 and Geant3

Show: Today's Messages :: Polls :: Message Navigator

Re: Difference of neutral candidate between Geant4 and Geant3 [message #15835 is a reply to message #15624]

Thu, 06 February 2014 11:56

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

Attachment: number_neutral.png
(Size: 16.77KB, Downloaded 1756 times)
Attachment: number_crystals.png
(Size: 14.48KB, Downloaded 1618 times)
Attachment: number_neutral_gt2.png
(Size: 14.34KB, Downloaded 1772 times)

Report message to a moderator

[Message index]

		Difference of neutral candidate between Geant4 and Geant3 By: donghee on Thu, 31 October 2013 10:12
		Re: Difference of neutral candidate between Geant4 and Geant3 By: StefanoSpataro on Fri, 01 November 2013 12:41
		Re: Difference of neutral candidate between Geant4 and Geant3 By: donghee on Mon, 11 November 2013 13:46
		Re: Difference of neutral candidate between Geant4 and Geant3 By: StefanoSpataro on Mon, 11 November 2013 18:04
		Re: Difference of neutral candidate between Geant4 and Geant3 By: donghee on Tue, 12 November 2013 10:53
		Re: Difference of neutral candidate between Geant4 and Geant3 By: donghee on Fri, 15 November 2013 15:34
		Re: Difference of neutral candidate between Geant4 and Geant3 By: StefanoSpataro on Fri, 15 November 2013 16:15
		Re: Difference of neutral candidate between Geant4 and Geant3 By: Dima Melnychuk on Thu, 06 February 2014 11:56
		Re: Difference of neutral candidate between Geant4 and Geant3 By: StefanoSpataro on Fri, 07 February 2014 19:46
		Re: Difference of neutral candidate between Geant4 and Geant3 By: StefanoSpataro on Fri, 09 January 2015 22:21

Previous Topic:	MC true match with geant4
Next Topic:	Pythia as external decayer for Geant3

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Sep 26 17:54:26 CEST 2026

Total time taken to generate the page: 0.00688 seconds