|Message: Re: wrong momentum distribution of secondary after neutron capture||Not Logged In (login)|
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Thanks for your response.
Note how, in my original post it says "meV" (as in milli eV), not MeV, so I am using cold neutrons.
In my simulation I need to know the combination (E_step-deposited) x cos(theta), where theta is the angle the initial secondary track momentum makes with respect to some defined polarization axis (e.g. Z-axis). The process of interest here is not actually the neutron capture, but the ionization from the secondaries after the decay of the compound 4He (n+3He -> 4He* -> p + T + ~765 keV).
I agree, I could collect the energies deposited in each step through a given SD and then multiply by the cos(theta) later and therefore reduce overhead in data collection, but that should not change the distribution, since the vertex momentum direction is what it is and should not change for later steps of the same tracked particle, unless I am misinterpreting what "vertex momentum direction" means. I assume it means the momentum direction that the secondary particle had the time it was created.
I guess at this point I'd like to know where in the physics implementation for a process like this the kinematics are set ...
Maybe someone who knows the details could help !?