|Message: Does Geant4 model proton boron fusion reaction?||Not Logged In (login)|
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I am trying to quantify amplification of bragg-peak in an 80 MeV proton beam when a layer of boron inserted in the location of the peak. I have set-up a simple cylindrical water phantom geometry with a layer of boron inserted at depth of 5.2 cm (where the bragg-peak occur). Using sensitive detector method, I scored the dose along the beam axis with and without boron layer. However, I can't observe any difference in the intensity of the peak when boron layer is existent.
Proton boron fusion reaction should occur within boron layer. 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). Subsequently, the beryllium is divided into the two alpha particles of 2.74 MeV each.
I set tracking verbose to 1 and noticed that only about 10 alphas are generated when 100000 protons were fired. Even though, the energy deposition of alphas did not occur at around the same position as expected for such reaction. So I assume I am not picking up proton fusion reaction at all.
I am using QGSP_BIC_HP package. Proton cut-value was set to 1 micron (100 eV) which is well below the cross-section for this reaction.
I would very much appreciate if you could support. I have been stock for a while and it is a simple set-up and I have actually ran out of idea what to change.
Many thanks, Leila
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