Protons on Fluorine don't create gammas seen in experiment

Physics Processes, Models and Cross Sections
1

Hi all,

I’ve been trying to run a simulation where I try to excite Fluorine atoms with low energy protons (2-4MeV) and look at the contribution of the 109KeV and 197KeV excited states to the energy spectrum.

From experiments I know the lines should exist at these energies, but from simulation I can’t get them to show up.
What I’ve done so far:

  • Artificially increased density to 100x to improve cross section
  • Checked most physics lists, and with each the different EM options (e.g. the _EMV, _EMZ extensions of the physics lists)
  • Updated the G4ParticleXS data to the newest version, but that did not make a difference.
  • Checked with neutrons of similar energy: the 109 and 197KeV gammas are created.

Does anyone have an idea why I can’t seem to create the gammas I’m looking for?

Thanks in advance!

_Geant4 Version:_10.05.p1
_Operating System: Ubuntu 18.04.6 LTS
_Compiler/Version: gcc/g++ 9.4.0
_CMake Version: 3.10.2