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Forum: Hadronic Processes
Re: None Wrong branching ratio in Boron-10 neutron capture (Andrew Erlandson)
Date: 21 Feb, 2014
From: michel maire <michel maire>

On Thu, 20 Feb 2014 20:36:47 GMT, Andrew Erlandson wrote:
> I'm trying to verify to the hadronic physics processes for a boron lined
> neutron detector but I'm coming up with a problem. The dominant decay
> from thermal neutron capture on boron-10 should be alpha(1.47MeV) +
> Li7(0.84MeV) at 94% but I never see this process occuring. Instead, I
> see only the suppressed decay channel where the reaction produces
> alpha(1.78MeV) + Li7(1.01MeV) which is supposed to only occur 6% of the
> time.
> 
> This is important because I'm working to characterize the response of
> gas filled detectors where signals are proportional to dE/dx and as it
> stands 2 possible signal variations are not occuring. The energy loss in
> the gas volume seems to be occuring as expected at least.
> 
> I'm using geant4.9.4p02 with the GNDL4.2 data libraries. I'm also using
> the QGSP_BERT_HP physics list to cover the hadronic stuff.
> 
> I'm thinking there's either a subtle issue with either the GNDL data or
> the way I've defined my neutron capture material but I've varied the
> material definition and implementation and the results are always the
> same.
> 
> Any ideas are appreciated!
> 

 I ran Hadr03 with attached macro.
 Also attached: log file and plots for alpha and Li7

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/21/03.16-54264-andrew.mac.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/21/03.16-71149-andrew.log.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/21/03.16-44287-alpha.gif
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/21/03.16-24740-Li7.gif

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