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Forum: Hadronic Processes
Re: Question Clarifications about scatterings (Eleni Petrakou)
Date: 02 Jun, 2016
From: Michael H. Kelsey <Michael H. Kelsey>

On Thu, 02 Jun 2016 09:55:46 GMT, Eleni Petrakou wrote:
> We scatter protons on carbon, and see a few features that we are not sure 
> we understand... 
> If a primary proton excites the nucleus during an inelastic scattering and 
> continues on its way, what happens to it?

It doesn't continue on its way :-) In an inelastic interaction, the incoming projectile will always be killed as it interacts. There may be one or more secondaries of the same species produced, but those are always "new" particles coming out of the nucleus.

> We suspect it gets classified as a secondary proton, is it so? 
> If yes, then how can we distinguish between the primary initiating the 
> interaction and any secondary protons emitted from the nucleus?

The primary will no longer be a track. You might approximate that the highest energy secondary "corresponds" to the projectile, but that's not necessarily the case. Also, there can be effective "charge exchange" reactions, where the incoming proton stops and kicks out a neutron instead.

> For that matter, what happens to a primary undergoing a quasi-elastic scattering?

Quasi-elastic is a separate process from inelastic. In that case, I believe that the primary particle may continue on its way, with multiple secondaries produced from the nuclear de-excitation.

> We guess that the secondary products of quasi-elastics appear as products 
> of inelastics. Is it so? And if yes, how can we distinguish between those 
> coming from each case?

Look at postStepPoint-GetProcessDefinedStep(). This returns a pointer to the G4VProcess* which limited the step, and you can look at the process name to see what happened. This is the same name printed out at the end of each line in the verbose tracking output.

  -- Michael Kelsey

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1 Idea: Re: Clarifications about scatterings   (Vladimir Ivanchenko - 02 Jun, 2016)
1 Question: Re: Clarifications about scatterings   (Eleni Petrakou - 02 Jun, 2016)
2 Question: Re: Clarifications about scatterings   (Eleni Petrakou - 07 Jun, 2016)
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