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Question Re: Which physical processes or models should I include in the physical list?  

Forum: Physics List
Re: Question Which physical processes or models should I include in the physical list? (liyong)
Re: Idea Re: Which physical processes or models should I include in the physical list? (Vladimir Ivanchenko)
Date: 25 Apr, 2017
From: liyong <liyong>

Dear Vladimir,

Thank you very much for your help! But I still have some questions about the process.

I tried some EM physics, such as G4EmStandard_option4, G4EmStandardPhysicsSS, G4EmStandardPhysicsWVI, G4EmLowEPPhysics and G4EmLivermorePhysics. When the energy of the incident proton is equal or lower than 1 keV, the proton will lost all the kinetic energy at the first step with the process of 'CoupledTransportation'. If the particle source was set on the surface of the PhysicalVolume, the proton could incident on the material directly without crossing the volume boundaries. The process of 'CoupledTransportation' disappeared. However, the proton would still be stopped at the first step with the process of MSC, CoulombScat or hIoni (the processes vary with the different EM physics) if the energy of the incident proton is equal or lower than 1 keV. So I can't get the information of the reflection of the protons with the energy below 1 keV.

If the energy of the incident proton is larger than 1 keV, the energy deposited at the first step with the process of 'CoupledTransportation' is very low and amost has no effect on the transportation.

Is it right that the proton be stopped at the first step if the energy is below 1 keV? What can I do if I want to simulate the reflection of the proton with the energy below 1 keV?

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