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Question Re: Does Geant4 model proton boron fusion reaction? 

Forum: Physics List
Re: Question Does Geant4 model proton boron fusion reaction? (Leila Moghadasi)
Re: None Re: Does Geant4 model proton boron fusion reaction? (michel maire)
Date: 19 Apr, 2018
From: Leila Moghadasi <Leila Moghadasi>

Dear Michael,

Many thanks for the reply.

I incorporated the physics list from Hadr06 and activated QGSP_BIC_HP based on the information you provided. However, still absorbed dose in a boron layer in my geometry is very low compared with published data obtained from MCNPX.

I then tried running example Hadr03 for a proton beam of 80 MeV in a phantom with B10 or B11 material: /control/verbose 2 /run/verbose 2 #

/testhadr/det/setIsotopeMat B10 5 10 2.08 g/cm3 /testhadr/det/setSize 10 cm # /run/initialize # /gun/particle proton /gun/energy 80 MeV # /process/list /process/inactivate hadElastic

#
#
/run/printProgress 10000 # /run/beamOn 100000

The output is attached. While the number of alpha particles produced are much larger when water material is used, I am pretty sure I am not picking up proton boron fusion reaction and that's why I see discrepancy with MCNPX results. After the proton reacts with the boron (11B), the boron changes to carbon (12C) in an excited state. The excited carbon nucleus is split into alpha particle of ~3.76 MeV and beryllium (8Be). 8Be is then divided into the two alpha particles of ~2.74 MeV each.

Could you please give me some feedback, how I could get fusion reaction?

Many thanks! Leila

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/04/19/23.29-71282-output.txt

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