Multiple Lithium gammas after B10(n,a)

Physics Processes, Models and Cross Sections
1

Please fill out the following information to help in answering your question, and also see tips for posting code snippets. If you don’t provide this information it will take more time to help with your problem!

_Geant4 Version:_11.2.1

Hi all,

I was checking secondaries produced in 10B(n,a) reactions and I’m seeing some unexpected gammas. From my understanding, if 7Li* is produced, it deexcites with a ~478keV gamma. When I print out the particles produced, I get the following:

----------- neutronInelastic -----------
G4WT0 > alpha - 1.4726
G4WT0 > gamma - 0.477603
G4WT0 > Li7 - 0.83441
G4WT0 > gamma - 0.0029495
G4WT0 > gamma - 0.0029495
G4WT0 > ----------- neutronInelastic -----------
G4WT0 > alpha - 1.47242
G4WT0 > gamma - 0.477603
G4WT0 > Li7 - 0.838313
G4WT0 > gamma - 0.00108581
G4WT0 > gamma - 0.00108581
G4WT0 > ----------- neutronInelastic -----------
G4WT0 > alpha - 1.47255
G4WT0 > gamma - 0.476685
G4WT0 > Li7 - 0.841272
G4WT0 > ----------- neutronInelastic -----------
G4WT0 > alpha - 1.4725
G4WT0 > gamma - 0.477523
G4WT0 > Li7 - 0.840485

B10 gammas
B10 gammas602×591 30.1 KB

Here is the resultant histogram and as you can see, it ends up being a pretty big flux of single keV gammas. When I checked ENSDF, I only saw the 478 level so I’m not sure of the cause. I’m also confused that they always seem to be in pairs of identical energies. I was curious if anyone had an explanation?

Thanks!

2

Have you tried: /process/had/particle_hp/do_not_adjust_final_state true ?

3

That seemed to make them disappear, thanks! Is that just an artificial conservation of energy adjustment that geant does?