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Forum: Physics List
Re: None CoulombScat under 100 MeV (Florian Zenoni)
Date: 11 Oct, 2013
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

Hello Florian,

Below 100 MeV multiple scattering is used, so it is not needed to extend Coulomb Scattering down to avoid double counting.

Cheers,
Vladimir

-----Original Message-----
From: Florian Zenoni [mailto:fzenoni@cern.ch] 
Sent: Friday, October 11, 2013 3:17 PM
To: phys-list-g4hn@slac.stanford.edu
Subject: CoulombScat under 100 MeV


*** Discussion title: Physics List

Hello,

I hope this topic hadn't already come out.
I'm using FTFP_BERT_HP Physics List to simulate neutrons interactions over a wide energy range (1.E-8 MeV -> 1.E3 MeV) and I'm experiencing differences with a paper which I take as a reference.
So, trying to investigating the causes, I find out that the difference comes from the region E <~ 10 MeV.

Looking at the beginning of the simulation, I see this:
CoulombScat: for e- SubType= 1
      Lambda table from 100 MeV to 10 TeV in 35 bins, spline: 1
      180 < Theta(degree) < 180; pLimit(GeV^1)= 0.139531
      ===== EM models for the G4Region DefaultRegionForTheWorld ======
  eCoulombScattering : Emin= 100 MeV Emax= 10 TeV

There is no eCoulombScattering when E < 100 MeV. Is it expected? Is there a way to lower it to 0 MeV? Would it be correct?

Thanks a lot,
Florian

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1 None: Re: RE: CoulombScat under 100 MeV   (Florian Zenoni - 11 Oct, 2013)
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