Geant4  10.00.p02
G4CoulombBarrier.cc
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26 // $Id: G4CoulombBarrier.cc 67983 2013-03-13 10:42:03Z gcosmo $
27 //
28 // Hadronic Process: Nuclear De-excitations
29 // by V. Lara (Dec 1999)
30 //
31 // 14-11-2007 modified barrier by JMQ (test30)
32 // 15-11-2010 V.Ivanchenko use G4Pow and cleanup
33 
34 #include <sstream>
35 
36 #include "G4CoulombBarrier.hh"
37 #include "G4PhysicalConstants.hh"
38 #include "G4SystemOfUnits.hh"
39 #include "G4HadronicException.hh"
40 #include "G4Pow.hh"
41 
43 {}
44 
46  : G4VCoulombBarrier(anA,aZ)
47 {}
48 
50 {}
51 
53 {
54  return 1.0;
55 }
56 
57 G4double G4CoulombBarrier::GetCoulombBarrier(const G4int ARes, const G4int ZRes, const G4double) const
58  // Calculation of Coulomb potential energy (barrier) for outgoing fragment
59 {
60  G4double Barrier = 0.0;
61  if (ZRes > ARes || ARes < 1) {
62  std::ostringstream errOs;
63  errOs << "G4CoulombBarrier::GetCoulombBarrier: ";
64  errOs << "Wrong values for ";
65  errOs << "residual nucleus A = " << ARes << " ";
66  errOs << "and residual nucleus Z = " << ZRes << G4endl;
67 
68  throw G4HadronicException(__FILE__, __LINE__, errOs.str());
69  }
70  if (GetA() == 1 && GetZ() == 0) {
71  Barrier = 0.0; // Neutron Coulomb Barrier is 0
72  } else {
73 
74  // JMQ: old coulomb barrier commented since it does not agree with Dostrovski's prescription
75  // and too low barriers are obtained (for protons at least)
76  // calculation of K penetration factor is correct
77  // G4double CompoundRadius = CalcCompoundRadius(static_cast<G4double>(ZRes));
78  // Barrier = elm_coupling/CompoundRadius * static_cast<G4double>(GetZ())*static_cast<G4double>(ZRes)/
79  // (std::pow(static_cast<G4double>(GetA()),1./3.) + std::pow(static_cast<G4double>(ARes),1./3.));
80 
82  G4double rho=1.2*fermi;
83  if(GetA()==1 && GetZ()==1){ rho=0.0;}
84 
85  G4double RN=1.5*fermi;
86  // VI cleanup
87  Barrier=elm_coupling*(GetZ()*ZRes)/(RN * G4Pow::GetInstance()->Z13(ARes) + rho);
88 
89  // Barrier penetration coeficient
91 
92  Barrier *= K;
93 
94  // JMQ : the following statement has unknown origin and dimensionally is meaningless( energy divided by mass number in argument of sqrt function). Energy dependence of Coulomb barrier penetrability should be included in proper way (if needed..)
95  // Barrier /= (1.0 + std::sqrt(U/(2.0*static_cast<G4double>(ARes))));
96  //
97  }
98  return Barrier;
99 }
100 
101 
102 
static G4Pow * GetInstance()
Definition: G4Pow.cc:53
virtual ~G4CoulombBarrier()
G4double GetCoulombBarrier(G4int ARes, G4int ZRes, G4double U) const
G4int GetA(void) const
int G4int
Definition: G4Types.hh:78
G4double Z13(G4int Z) const
Definition: G4Pow.hh:129
G4int GetZ(void) const
#define G4endl
Definition: G4ios.hh:61
virtual G4double BarrierPenetrationFactor(G4double) const
double G4double
Definition: G4Types.hh:76
static const double fermi
Definition: G4SIunits.hh:93