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Forum: Hadronic Processes
Re: Question Muon-induced nuclear reactor in Geant4 10? (Nicola Mori)
Re: Idea Re: Muon-induced nuclear reactor in Geant4 10? (Vladimir Ivanchenko)
Date: 11 Apr, 2015
From: Nicola Mori <Nicola Mori>

I found that a sufficiently thick uranium target triggers the strange behaviour
more frequently, so I have been able to put together a simple simulation to 
show off the problem. Here is a tarball containing the code and the CMakeLists
to reproduce the issue:

https://www.hightail.com/download/UlRUa3NVNkdCTWsxZXNUQw

I tried this program on my 64 bit ArchLinux system with gcc 4.9.2. With Geant4 
10.00.p02 the simulation shows the "nuclear reactor" behaviour, while with 
Geant4 9.6.p03 the muon is stopped without producing any nuclear cascade. To 
better analyze what's going on during the simulation I applied this patch:

https://www.hightail.com/download/UlRUa3NVNkc3bUEwTWNUQw

to G4EventManager.cc to dump the secondaries. Here are the logs for the two
runs with 9.6.p03 and 10.00.p02 (I stopped the latter with Ctrl-C after a few 
seconds):

https://www.hightail.com/download/UlRUa3NVNkc3bURxYk1UQw
https://www.hightail.com/download/UlRUa3NVNkc3bUROUjhUQw

I don't know which behaviour is the correct one, and for what I know it could 
be due to changes in the code, changes in the models or  changes in the 
datasets (for each Geant4 version I used the datasets which are automatically 
installed when configuring the build with -DGEANT4_INSTALL_DATA=ON). Yet the 
two are really different so something must be wrong somewhere.

If this is really an issue and not just my fault then I can open a bug report if
needed, just tell me which bug tracker (Jira@CERN, Bugzilla@KEK, ...) I should
use.
Thanks.

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1 Feedback: Re: Muon-induced nuclear reactor in Geant4 10?   (Nicola Mori - 28 Apr, 2015)
(_ Feedback: Re: Muon-induced nuclear reactor in Geant4 10?   (Michael H. Kelsey - 28 Apr, 2015)
(_ Idea: Re: Muon-induced nuclear reactor in Geant4 10?   (Michael H. Kelsey - 28 Apr, 2015)
(_ Ok: Re: Muon-induced nuclear reactor in Geant4 10?   (Nicola Mori - 29 Apr, 2015)
(_ More: Re: Muon-induced nuclear reactor in Geant4 10?   (Michael H. Kelsey - 29 Apr, 2015)
(_ More: Re: Muon-induced nuclear reactor in Geant4 10?   (Nicola Mori - 30 Apr, 2015)
(_ None: Re: Muon-induced nuclear reactor in Geant4 10?   (michel maire - 30 Apr, 2015)
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