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G4GEMCoulombBarrier.cc
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26 // J. M. Quesada (July 2009): New class based on G4GEMCoulombBarrierHE
27 // Coded strictly according to Furihata's GEM paper
28 // NEW:effective decrease of barrier with E* (Barashenkov) has been added
29 //
30 #include "G4GEMCoulombBarrier.hh"
31 #include "G4HadronicException.hh"
32 #include "G4Pow.hh"
33 #include "G4PhysicalConstants.hh"
34 #include "G4SystemOfUnits.hh"
35 
37  G4CoulombBarrier(anA,aZ)
38 {
39  AejectOneThird = g4calc->Z13(anA);
40 }
41 
43 {}
44 
46  G4double U) const
47 // Calculation of Coulomb potential energy (barrier) for outgoing fragment
48 {
49  G4double Barrier = 0.0;
50  if (GetZ() > 0 && ZRes > 0) {
51 
52  G4double CompoundRadius = CalcCompoundRadius(ARes);
53  Barrier = CLHEP::elm_coupling * (GetZ() * ZRes)/CompoundRadius;
54 
55  // Barrier penetration coeficient
56  if(GetA() <= 4) { Barrier *= BarrierPenetrationFactor(ZRes); }
57 
58  //JMQ 200709 effective decrease of barrier with E* (Barashenkov)
59  // (not inclued in original Furihata's formulation)
60  Barrier /= (1.0 + std::sqrt(U/(static_cast<G4double>(2*ARes))));
61  }
62  return Barrier;
63 }
64 
65 G4double G4GEMCoulombBarrier::CalcCompoundRadius(G4int ARes) const
66 {
67  G4double AresOneThird = g4calc->Z13(ARes);
68  G4int A = GetA();
69 
70  G4double Result = 0.0;
71  if(A == 1){
72  Result = 1.7* AresOneThird;
73 
74  } else if (A <= 4){
75  Result = 1.7* AresOneThird + 1.2;
76 
77  } else {
78  Result = 1.12*(AresOneThird + AejectOneThird) -
79  0.86*(AresOneThird+AejectOneThird)/(AresOneThird*AejectOneThird)+3.75;
80  }
81  return Result*fermi;
82 }
83 
84 
G4int GetA(void) const
int G4int
Definition: G4Types.hh:78
G4double Z13(G4int Z) const
Definition: G4Pow.hh:127
double A(double temperature)
virtual G4double GetCoulombBarrier(G4int ARes, G4int ZRes, G4double U) const
static constexpr double elm_coupling
G4GEMCoulombBarrier(G4int anA, G4int aZ)
double G4double
Definition: G4Types.hh:76
static constexpr double fermi
Definition: G4SIunits.hh:103