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Question Re: neutron scattering in liquid Argon 

Forum: Hadronic Processes
Re: Question neutron scattering in liquid Argon (Balint Radics)
Re: Idea Re: neutron scattering in liquid Argon (Vladimir Ivanchenko)
Date: 04 Nov, 2016
From: Balint Radics <Balint Radics>


thank you very much for this answer.

We have found that this internal threshold is related to a secondary production range cut parameter, for example called like this:

/run/setCutForAGivenParticle proton 100 nm

It looks that the default value for this cut is 0.7 mm from the documentation, which seems to produce an internal threshold of around 100 keV in a simulation with around 1.5 MeV neutrons. For our experiment the detection threshold is much lower so we lowered the threshold to 100 nm using the command above.

It turns out that the elastic scattering multiplicity in our experiment depends quite a lot on the cut parameter, therefore we would need to understand how to "tune" it. At the same time it does not seem to affect the number of inelastic scatters per event.

I was wondering how exactly this range cut is converted to an internal threshold, could you please point to a relevant source file where the calculation takes place ?

Thank you very much for your help in advance.

Best regards, Balint

On Sun, 16 Oct 2016 10:46:44 GMT, Vladimir Ivanchenko wrote:

> Hello,
> sorry for the late answer. If a hadron elastic process happens at a step (hadElastic in traking verbose) then energy transfer to the recoil always taken place. If this energy transfer is below the internal threshold it is added to the energy deposit at this step and you see that a neutron has a continues energy loss. If the recoil energy is above the threshold a recoil ion iscreated and further tracked.
> VI 

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