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Idea Re: Nuclear recoil in neutron elastic scattering 

Forum: Hadronic Processes
Re: Question Nuclear recoil in neutron elastic scattering (Marco Selvi)
Date: 07 Mar, 2018
From: Michael H. Kelsey <Michael H. Kelsey>

On Wed, 07 Mar 2018 22:20:53 GMT, Marco Selvi wrote:
> Hi, In G4.10.3, how can I "force" G4 to produce explicitly the nuclear
> recoil after a neutron elastic scattering ?
> I see that most of the time the energy is deposited by the neutron
> itself via the hadElastic process, without the generation and tracking
> of a recoiling nucleus.
> I already saw this behaviour in G4.9.5, but it happened only for energy
> deposits < 1 keV, while now I see it also for ~MeV recoil energy.
> How can I set this "energy threshold" for the NR production ?

In your physics list, the "production cut" for protons also applies to nuclei. If you set it to a small value (e.g., SetCutValue(1*um, "proton")), then you should see more of the recoiling nuclei.

What you see is the expected behaviour: if the estimated travel distance of the secondary (here, the recoiling nucleus), is shorter than the production cut length, the secondary will not be created, and instead the energy transfer will be assigned to the track itself under "EnergyDeposit".

   -- Michael Kelsey

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1 None: Re: Nuclear recoil in neutron elastic scattering   (michel maire - 08 Mar, 2018)
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