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Forum: Hadronic Processes
Re: Question Radioactive Decay of Be8 (Joel Long)
Date: 30 Apr, 2013
From: michel maire <michel maire>

On Mon, 29 Apr 2013 20:35:48 GMT, Joel Long wrote:
> In modeling a detector, two of the reactions I am looking for is:
> 
> Be9 (n,2n) Be8 -> 2alpha Be9 (n,alpha) He6
> 
> I am using the HP neutron data, and have verified that the
> cross-sections for both reactions are correct.
> 
> The problem is that I am not seeing any Be8 produced, based on a check
> in a user stepping action (even though it should be the dominant
> inelastic product in the ~14 MeV range I am interested in), and I have
> not been able to verify that the associated alphas are showing up
> either. 
>
> Can someone verify whether Be8 -> 2alpha is handled by the code in some
> way I haven't found, and perhaps the best way to check that this
> reaction is happening? All the useful SetVerbose() functions I have
> found are fairly inaccessible without building a completely custom
> physics list.
> 
 1- I ran Hadr03, for neutronHP and binaryCascade, with macro below.
    Results in attachment.

 # Macro file for "Hadr03.cc"
 # (can be run in batch, without graphic)
 #
 /testhadr/det/setIsotopeMat Be9 4 9 1.85 g/cm3
 /testhadr/det/setSize 100 m
 #
 /run/initialize
 #
 /gun/particle neutron
 /gun/energy 14 MeV
 #
 /process/list
 /process/inactivate hadElastic
 #
 /run/beamOn 100000 

 2- It is true that alpha decay of Be8 is not handled by radioactive decay data.
 However you can write your own data file. Examples are shown both in rdecay01 and rdecay02.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/04/30/04.57-71461-neutronHP.log.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/04/30/04.57-75854-QBBC.log.txt

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