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None Wrong branching ratio in Boron-10 neutron capture 

Forum: Hadronic Processes
Date: 20 Feb, 2014
From: Andrew Erlandson <Andrew Erlandson>

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!

Andrew

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1 None: Re: Wrong branching ratio in Boron-10 neutron capture   (michel maire - 21 Feb, 2014)
(_ None: Re: Wrong branching ratio in Boron-10 neutron capture   (Andrew Erlandson - 21 Feb, 2014)
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