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Question Muonic capture cascade: only hydrogen-like? 

Keywords: Muonic atom; mu- cascade; non-hydrogen energy levels
Forum: Hadronic Processes
Date: 30 Apr, 2007
From: Elena Novikova <Elena Novikova>

We modeling physics that require the best possible model of muonic atom:
capture and cascade.  I found G4MuonMinusCaptureAtRest and 
G4MuMinusCaptureCascade classes.  The function 
G4MuMinusCaptureCascade::DoCascade()  defines what hard X-rays will be 
emitted by the atom when muon cascades down the levels.  the levels are 
organized using the following code:

  G4double EnergyLevel[14];

  G4double mass = MuMass * massA / (MuMass + massA) ;

  const G4double KEnergy = 13.6 * eV * Z * Z * mass/ electron_mass_c2;

  EnergyLevel[0] = GetKShellEnergy(Z);
  for( G4int i = 2; i < 15; i++ ) {
    EnergyLevel[i-1] = KEnergy / (i*i) ;
  }

i.e., they scale by mass of the H atom.  This works good as first 
approximation,  but doesn't satisfy the need for exact energy pattern 
and exact lines, the need we currently have.  Say, when I shoot
energetic mu- into a brick of U-235, I am getting a line of 6.05MeV 
instead of a split line, with both energies slightly above 6.05...

Here are my questions:
1. Does Geant4 has the ability to generate the exact hard X-ray lines 
of the muon cascades in various materials, may be using some other code 
that the one I looked at?
2. If the answer to the first question is "no,"  is anything like that 
in the plans for future releases?
3. If we were to write our own extension trying to address this problem,
would it be sufficient to rewrite G4MuMinusCaptureCascade::DoCascade()
function (after bringing info on atom properties into it), or
something else is in order?

Thank you for your help.
-- Elena Novikova.

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