Scattering Model Selection at Low Gas Pressure

Physics Processes, Models and Cross Sections
1

Geant4 Version: geant4-11-00-patch-03
Operating System: Alma9
Compiler/Version: gcc version 11.4.1
CMake Version: 3.26.5

Dear Geant4 community,

I am seeking guidance on selecting appropriate scattering processes for heavy ions in low-pressure environments. According to Geant4 Physics Reference Manual:

However, in low-density media (vacuum, low-density gas) multiple scattering may provide wrong results and single scattering processes are more appropriate.

My simulation setup:

  • Beam particle: ‌Pb ions‌

  • Beam energy: ‌60 keV‌

  • Residual gas pressure: ‌1E-3 Pa

‌Question:
Should I use the single scattering process instead of multiple scattering under these conditions?

Thank you for your expertise,

Yeung