G4StopElementSelector.cc

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// $Id: G4StopElementSelector.cc 69573 2013-05-08 13:35:53Z gcosmo $
//
// File: G4StopElementSelector
//
// Author:        V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
// 
// Creation date: 2 April 2000
//
// Modifications: 
// 18/08/2000  V.Ivanchenko Update description
// 17/05/2006  V.Ivanchenko Cleanup
// 02/10/2007  V.Ivanchenko Fixed typo in computation of Lambda-factor
//                          proposed by Victor Pec 
// 04/23/2013  K.Genser     used new G4MuonMinusBoundDecay
//                          in GetMuonCaptureRate and GetMuonDecayRate
//---------------------------------------------------------------------

#include "G4StopElementSelector.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "Randomize.hh" 
#include "G4Material.hh"
#include "G4MuonMinusBoundDecay.hh"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

// constructor
G4StopElementSelector::G4StopElementSelector()
{ }

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

// destructor
G4StopElementSelector::~G4StopElementSelector()
{ }


//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4Element* G4StopElementSelector::GetElement(const G4Material* aMaterial)
{
  // Fermi-Teller Z-low of mu- capture and exceptions 
  // for halogens and oxigen.
  // N.C.Mukhopadhyay Phys. Rep. 30 (1977) 1.
  G4int i;
  G4double Z;
  const G4int numberOfElements = aMaterial->GetNumberOfElements();
  const G4ElementVector* theElementVector = aMaterial->GetElementVector();

  if(1 == numberOfElements) return (*theElementVector)[0];
    
  const G4double* theAtomicNumberDensity = aMaterial->GetAtomicNumDensityVector();

  G4double sum = 0.0;
  for ( i=0; i < numberOfElements; i++ ) {

    Z = (*theElementVector)[i]->GetZ();

      // Halogens
    if( (9.0 == Z) || (17.0 == Z) || (35.0 == Z) || (53.0 == Z) || (85.0 == Z) ) {
      sum += 0.66 * Z * theAtomicNumberDensity[i] ; 

      // Oxigen
    } else if( 8.0 == Z ) {
      sum += 0.56 * Z * theAtomicNumberDensity[i] ; 

      // Others
    } else {
      sum +=        Z * theAtomicNumberDensity[i] ; 
    }
  }

  G4double random = G4UniformRand() * sum;
  sum = 0.0 ;
  i   = -1;

  // Selection of element
  do {
    i++;
    Z = (*theElementVector)[i]->GetZ();

      // Galogens
    if( (9.0 == Z) || (17.0 == Z) || (35.0 == Z) || (53.0 == Z) || (85.0 == Z) ) {
      sum += 0.66 * Z * theAtomicNumberDensity[i] ; 

      // Oxigen
    } else if( 8.0 == Z ) {
      sum += 0.56 * Z * theAtomicNumberDensity[i] ; 

      // Others
    } else {
      sum +=        Z * theAtomicNumberDensity[i] ; 
    }
  } while ( (sum < random) && (i < numberOfElements - 1) );

  return (*theElementVector)[i];
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4double  G4StopElementSelector::GetMuonCaptureRate(G4double Z, G4double A)
{
  return G4MuonMinusBoundDecay::GetMuonCaptureRate(G4int(Z),G4int(A));
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4double  G4StopElementSelector::GetMuonDecayRate(G4double Z, G4double /* A */)
{
  return G4MuonMinusBoundDecay::GetMuonDecayRate(G4int(Z));
}