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Forum: Event and Track Management
Re: Question Energy deposition of secondaries (Neo)
Date: 22 May, 2018
From: Michael H. Kelsey <Michael H. Kelsey>

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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1 Question: Re: Energy deposition of secondaries   (Neo - 22 May, 2018)
(_ Idea: Re: Energy deposition of secondaries   (Vladimir Ivanchenko - 04 Jul, 2018)
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