Scattering Model Selection at Low Gas Pressure

Physics Processes, Models and Cross Sections
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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

2 Likes
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Hello,

in low presure media single scattering should be used instead of multiple scattering. We have G4EmStandardPhysicsSS electromagnetic physics constructor, in which only single scattering is used. If in your simulation you need both transport in solids (for example, vacuum tube) and in low density gas it may be optimal to use standard EM physics everywhere and configure single scattering in the gas.

VI

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