Can someone, please, help me understand this following simulated event?
I have a photon generating two electrons (at the same initial position and time) via a Compton process.
One electron doesn’t move in space, lives for a short time and has low initial kinetic energy, while the second electron moves longer in space and time and has larger energy.
--- Printing MCTrack information for track (0x7f1da05eecb0) ----------------------
Particle type (PDG ID): 22
Production process: annihil (G4 process type: 2)
Production in G4Volume: water_block_phys
Initial position: 0.420922 mm | -0.529835 mm | -0.052366 mm
Final position: -15.9854 mm | 6.48652 mm | 56.0835 mm
Initial time: 0.00412973 ns
Final time: 0.278189 ns
Initial kinetic energy: 0.510999 MeV | Final kinetic energy: 0.150391 MeV
Initial total energy: 0.510999 MeV | Final total energy: 0.150391 MeV
Linked parent: 0x7f1da05eeae0
----------------------------------------------------------------------------------
--- Printing MCTrack information for track (0x7f1da05eed98) ----------------------
Particle type (PDG ID): 11
Production process: compt (G4 process type: 2)
Production in G4Volume: water_block_phys
Initial position: -7.74191 mm | -9.23105 mm | -7.92486 mm
Final position: -7.74191 mm | -9.23105 mm | -7.92486 mm
Initial time: 0.0566245 ns
Final time: 0.0566252 ns
Initial kinetic energy: 0.00050894 MeV | Final kinetic energy: 0 MeV
Initial total energy: 0.511508 MeV | Final total energy: 0.510999 MeV
Linked parent: 0x7f1da05eecb0
----------------------------------------------------------------------------------
--- Printing MCTrack information for track (0x7f1da05eee80) ----------------------
Particle type (PDG ID): 11
Production process: compt (G4 process type: 2)
Production in G4Volume: water_block_phys
Initial position: -7.74191 mm | -9.23105 mm | -7.92486 mm
Final position: -7.72954 mm | -9.24719 mm | -8.14298 mm
Initial time: 0.0566245 ns
Final time: 0.0584198 ns
Initial kinetic energy: 0.18219** MeV | Final kinetic energy: 0 MeV
Initial total energy: 0.693189 MeV | Final total energy: 0.510999 MeV
Linked parent: 0x7f1da05eecb0
----------------------------------------------------------------------------------
Both electrons are from the same photon.
Is this an event that electrons of different orbitals in the same atom are being excited?
my impression is that one electron is the Compton electron, directly kicked out by the incoming gamma, while the other is an Auger electron coming from the filling of the atomic vacancy… Which model are you using for the Compton scattering?
please, use UI command “/tracking/verbose 2” - history of simulation will allow to understand what happens. Log file may be long if you will require many events but you may limit the output by this particular event.
Thank you for your tip!
Just to let you know, I will try to implement this as soon as possible (I am using Allpix-squared for the Geant4 simulation, and I will have to hard-code this UI command in the framework code).
I will post the result here as soon as I have it.
Cheers,
M
