|Message: Re: Energy deposition of secondaries||Not Logged In (login)|
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On Mon, 21 May 2018 17:42:11 GMT, Neo wrote:
> Hello Everyone, I am having some problems with the scoring of energy > deposition of secondaries. I shoot a 100 MeV proton beam to a tungsten > thin layer, neutrons are generated by (p, xn) reactions then go through > a polyethylene moderator and some of them get into a He3 detector and > occur some reactions with He3. How can I get the deposited energy of > each the secondary neutron in the detector? I assume that most of the > neutrons are thermal energy and the particular reaction of the thermal > neutron (<0.0025 eV) is n + He3 -> (191keV) Triton + (573keV) proton + > Q=764 keV. As I calculated, if the primaries are thermal neutrons and > the Triton and the proton will be absorbed in the detector, the > deposited energy of each the event will be 764 keV, Why? Sorry for the > lacking of my knowledge about that problem.
Neutrons themselves do not ever have non-zero "EnergyDeposit" in Geant4. In G4, this quantity is only computed for charged tracks. Instead, the neutron interacts with a nucleus; if that nucleus is given a momentum kick, it will recoil and lose energy as it stops. The energy deposit will be recorded with the nucleus track. If the neutron is absorbed by a nucleus, which then decays (emitting gammas or nucleons), those secondaries will have an energy deposit recorded when they stop.
I hope this helps to understand where the energy gets recorded in G4.
-- Michael Kelsey
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