[Gate-users] Cannot get characteristic photons, gamma-rays from Gadolinium/Boron neutron cross section.

Elia Alessio alessio.elia at medaustron.at
Tue Dec 19 08:13:33 CET 2017

Hello Kurt,

I am not an expert in this topic but I have few comments that maybe can help:

-        It is concerning me a little bit the fact that you are trying to add a physic process with a physic builder (QGSP_BERT_HP_EMV) in place. I am not 100% sure this is working.... I think that in principle you should have an entire modified physic list.. maybe someone else from the community can give more insights here

-        From what you wrote it is difficult to understand if the there is no output produced by Gate or you got an output that you think is wrong.. Could you please give more details?

-        I guess the process you are trying to reproduce needs a very high neutron fluence which is not so easy to obtain unless you do not use very energetic protons and extremely high statistic... maybe more details here could also help?


From: Gate-users [mailto:gate-users-bounces at lists.opengatecollaboration.org] On Behalf Of Kurt V
Sent: Dienstag, 19. Dezember 2017 01:55
To: gate-users at lists.opengatecollaboration.org<mailto:gate-users at lists.opengatecollaboration.org>
Subject: [Gate-users] Cannot get characteristic photons, gamma-rays from Gadolinium/Boron neutron cross section.

I am trying to run an example of a proton beam on gadolinium/Boron within the spread out bragg peak region and a detector just outside of the region.

The idea is to use the neutron fluence that the proton beam creates to reproduce a neutron-Gd/Boron reaction.
>From this process, characteristic photons and gamma-rays should be detected but, they are not being properly represented.

I am using the QGSP_BERT_HP_EMV physics list and I've added /gate/physics/addAtomDeexcitation
In theory everything should work but, the correct spectrum is not being produced showing the resulting photons/gamma-rays in the spectrum.

Does anyone have any experience with this?

Is there some catch that I am missing?

Thanks again guys,
All suggestions will be greatly appreciated.

Kurt W. Van Delinder

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