Message: FTFP_BERT in version 10.0 yields worse output than 9.4 for high energies? Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

Question FTFP_BERT in version 10.0 yields worse output than 9.4 for high energies? 

Forum: Hadronic Processes
Date: 09 Apr, 2014
From: Halil <Halil>

Hello,

I am injecting protons with energies up to 1 TeV over the modeled atmosphere, and count mu+s and mu­-s reaching the ground level (using FTFP_BERT as the hadronic model). I have run the simulations both in Geant4 version 9.4 and and 10.0 for the exact same conditions. However, if I am not mistaken­, although checked many times, I realized that version 10.0 gives lower mu+/mu­- ratio for high momenta (above 3 GeV/c) compared to the experiment, for which 9.4 is much more consistent with. This could imply that version 10.0 might be overestimating number of mu-s­ or underestimating number of mu+s for high momenta. Please see the attached plot.

I was wondering if the changes have been made in FTFP_BERT could result in this discrepancy and if anyone is aware of this situation.

Any feedback is appreciated.

Halil

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/04/09/04.13-83472-VersionComparison.pdf

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 None: Re: FTFP_BERT in version 10.0 yields worse output than 9.4 for high energies?   (Dennis H. Wright - 22 Apr, 2014)
(_ None: Re: FTFP_BERT in version 10.0 yields worse output than 9.4 for high energies?   (Halil - 08 May, 2014)
 Add Message Add Message
to: "FTFP_BERT in version 10.0 yields worse output than 9.4 for high energies?"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]