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Forum: Hadronic Processes
Re: Question What is ARM? (Glenn Randall)
Date: Feb 28, 14:50
From: Marc Verderi <Marc Verderi>

Hello,

ARM stands for "atomic relaxation model". And yes, it is the simulation 
of whatever rearrangement mechanism -X-ray (PIXE), fluorescence, Auger 
electron- that happens after radioactive decay, electronic capture, etc.

Then I can't answer the level of details with which it is done, the 
electromagnetic physics specialists of Geant4 will certainly do.

Cheers,

Marc

On 28/02/2019 23:06, Glenn Randall wrote:
> *** Discussion title: Hadronic Processes
>
> I am working on a GEANT simulation to determine the optimal location for
> sources for in-situ calibration and other detector studies for my
> experiment.
>
> I have spent the better part of the day trying to figure out what ARM
> (as in SetARM or ApplyArm) is. From comments in other people's code, it
> looks like it is atomic rearrangement. From what little I have found
> online, I am wondering if this is related to X-rays emitted by shell
> electrons dropping to s1 states after nuclear affects have caused said
> s1 states to become vacant. However, I cannot find anything explicit and
> have learned that assuming I know what is happening when I'm not sure is
> usually a good way to get into trouble. Given that one of the major
> benefits of simulation is that we should know exactly what is happening,
> I would like to know what exactly I am toggling with ARM.
>
> Thanks!
>
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