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Forum: Electromagnetic Processes
Re: Question Low energy muons - how to limit their step length (Kamil Sedlak)
Date: Oct 11, 14:55
From: michel maire <michel maire>

On Wed, 07 Oct 2009 08:47:32 GMT, Kamil Sedlak wrote:
> Dear All,
> 
> I would like to ask you for an advice with the following simulation.
> 
> THE EXPERIMENT TO SIMULATE:
> I simulate a muSR experiment, i.e. muons with initial momenta of approx. 28 MeV/c
> ( = kinetic energy of 3.65 MeV) hit a sample (e.g. a Copper plate), stop inside
> it and decay into e+ or e- and neutrinos.  Unlike in high-energy particle physics,
> muons at this energy scale have much shorter range than the e+ or e- from the 
> muon decay (e- and e+ have the energy range 0 - 52MeV).
> 
> THE PROBLEM:
> When using the default cuts, muons hitting the sample stop within one single step in
> the Cu sample.  The graph showing the stopping range of the muons in the Cu plate 
> is not smooth at all (it has some artificial bumps, see
> http://www-hep2.fzu.cz/~ksedlak/penetrationDepthInCuPlate_rough.png 
> if you are interested), even though the mean value and the spread of the muon range 
> distribution are more or less OK.  Numerically, the mean value of the muon range is 
> approx. 200 microns.

 We have examples to test various particle properties. Here it is
 examples/extended/electromagnetic/TestEm11 (see README)
 I ran it with with the macro in attachement. The plot of 3.65 MeV muon range in copper is also in attachement : very different of yours. Please explain what you plotted ?

 I will make another post for the stepLimiter.

   Cheers,  Michel

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/10/11/14.51-10673-kamil.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/10/11/14.52-65622-kamil.gif

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