Geant4  10.03.p02
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G4HETCFragment.cc
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26 // $Id: G4HETCFragment.cc 100378 2016-10-19 15:03:27Z gcosmo $
27 //
28 // by V. Lara
29 //
30 // Modified:
31 // 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor
32 // the source, use G4Pow
33 
34 #include "G4HETCFragment.hh"
35 #include "G4PhysicalConstants.hh"
36 
37 G4HETCFragment::
38 G4HETCFragment(const G4ParticleDefinition* part,
39  G4VCoulombBarrier* aCoulombBarrier)
40  : G4VPreCompoundFragment(part, aCoulombBarrier)
41 {
44 }
45 
47 {}
48 
51 {
52  if (GetEnergyThreshold() <= 0.0)
53  {
55  return 0.0;
56  }
57  // Coulomb barrier is the lower limit
58  // of integration over kinetic energy
60  IntegrateEmissionProbability(theCoulombBarrier,theMaxKinEnergy,aFragment);
61 
63 }
64 
65 G4double G4HETCFragment::
66 IntegrateEmissionProbability(G4double & Low, G4double & Up,
67  const G4Fragment & aFragment)
68 {
69  G4double U = aFragment.GetExcitationEnergy();
70 
71  G4int P = aFragment.GetNumberOfParticles();
72  G4int H = aFragment.GetNumberOfHoles();
73  G4int N = P + H;
74  G4int Pb = P - theA;
75  G4int Nb = Pb + H;
76  if (Nb <= 0.0) { return 0.0; }
79 
80  G4double A = G4double(P*P+H*H+P-3*H)/(4.0*ga);
81  G4double Ab = G4double(Pb*Pb+H*H+Pb-3*H)/(4.0*gb);
82  U = std::max(U-A,0.0);
83  if (U <= 0.0) { return 0.0; }
84 
85  G4int Pf = P;
86  G4int Hf = H;
87  G4int Nf = N-1;
88  for (G4int i = 1; i < theA; ++i)
89  {
90  Pf *= (P-i);
91  Hf *= (H-i);
92  Nf *= (N-1-i);
93  }
94 
95  G4double X = std::max(Up - Ab + GetBeta(),0.0);
96  G4double Y = std::max(Up - Ab - Low, 0.0);
97 
98  G4double Probability = r2norm*GetSpinFactor()*theReducedMass*GetAlpha()
99  *g4calc->Z23(theResA)*Pf*Hf*Nf*K(aFragment)*(X/Nb - Y/(Nb+1))
100  *U*g4calc->powN(gb*Y,Nb)/g4calc->powN(ga*U,N);
101 
102  return Probability;
103 }
double Y(double density)
G4double powN(G4double x, G4int n) const
Definition: G4Pow.cc:128
G4double GetEnergyThreshold() const
static constexpr double hbarc
G4int GetNumberOfParticles() const
Definition: G4Fragment.hh:345
virtual G4double GetSpinFactor() const =0
G4double GetLevelDensity() const
int G4int
Definition: G4Types.hh:78
static double P[]
G4DeexPrecoParameters * theParameters
G4double CalcEmissionProbability(const G4Fragment &aFragment)
G4int GetNumberOfHoles() const
Definition: G4Fragment.hh:365
double A(double temperature)
virtual G4double GetAlpha() const =0
virtual ~G4HETCFragment()
virtual G4double GetBeta() const =0
T max(const T t1, const T t2)
brief Return the largest of the two arguments
const G4double Pf
Fermi momentum [MeV/c].
virtual G4double K(const G4Fragment &aFragment)=0
G4double Z23(G4int Z) const
Definition: G4Pow.hh:154
**D E S C R I P T I O N
Definition: HEPEvtcom.cc:77
double G4double
Definition: G4Types.hh:76
static constexpr double pi
Definition: SystemOfUnits.h:54
G4double GetExcitationEnergy() const
Definition: G4Fragment.hh:283
static constexpr double pi2
Definition: G4SIunits.hh:78