Why Does GEANT4 Calculate a Lower Ionization Cross-Section Than Expected?

Deverno
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Hi. I need to calculate the ionization cross section in the accelerator storage ring. In all science works i read, that this parameter is over 2 Mbarn. I use the GEANT4's formula for cross section and got the cross section is ~milibarn. Please help me to calculate this cross-section. you can writh me on my ICQ# to ICQ# 311-844-289
 
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