[Gate-users] Proton Boron Fusion

[David Boersma]

Hi Saeed,


Have you tried the "Shielding" physics list? The Geant4 physics reference manual says about this list: "This physics list does invoke the G4RadioactiveDecay process, so unstable ions will be decayed." Maybe that is a better fit to your use case than QGSP_BIC.

http://geant4-userdoc.web.cern.ch/geant4-userdoc/UsersGuides/PhysicsListGuide/html/reference_PL/Shielding.html


HTH,

David B.



________________________________
Von: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> im Auftrag von Saeed Bagherzadeh <saeedbagherzadeh92 at gmail.com>
Gesendet: Samstag, 4. Jänner 2020 09:00:08
An: gate-users at lists.opengatecollaboration.org
Betreff: [Gate-users] Proton Boron Fusion

Hi,

I am trying to quantify the 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 water phantom geometry(10*10*10 cm) with a layer of boron (6*6*1 cm) inserted at a depth of 5.2 cm (where the Bragg-peak occur). 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 an 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 stuck for a while and it is a simple set-up and I have ran out of idea what to change.

Many thanks, Saeed

--
Saeed Bagherzadeh
Ph.D. Candidate
Medical Physics

E-mail: saeedbagherzadeh92 at gmail.com<mailto:saeedbagherzadeh92 at gmail.com>
saeedbagherzadeh at modares.ac.ir<mailto:saeedbagherzadeh at modares.ac.ir>
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