Geant4 11.2.2
Toolkit for the simulation of the passage of particles through matter
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G4HETCFragment.cc
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25//
26//
27// by V. Lara
28//
29// Modified:
30// 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor
31// the source, use G4Pow
32
33#include "G4HETCFragment.hh"
35#include "G4NuclearLevelData.hh"
37
39 G4VCoulombBarrier* aCoulombBarrier)
40 : G4VPreCompoundFragment(part, aCoulombBarrier)
41{
43 r2norm = r0*r0/(CLHEP::pi*CLHEP::hbarc*CLHEP::hbarc*CLHEP::hbarc);
44}
45
47{
48 if (GetEnergyThreshold() <= 0.0) {
50 return 0.0;
51 }
52 // Coulomb barrier is the lower limit
53 // of integration over kinetic energy
55 IntegrateEmissionProbability(theCoulombBarrier, theMaxKinEnergy, fp);
56
58}
59
61G4HETCFragment::IntegrateEmissionProbability(G4double Low, G4double Up,
62 const G4Fragment& frag)
63{
65
66 G4int P = frag.GetNumberOfParticles();
67 G4int H = frag.GetNumberOfHoles();
68 G4int N = P + H;
69 G4int Pb = P - theA;
70 G4int Nb = Pb + H;
71 if (Nb <= 0.0) { return 0.0; }
72
75
76 G4double A = G4double(P*P+H*H+P-3*H)/(4.0*ga);
77 G4double Ab = G4double(Pb*Pb+H*H+Pb-3*H)/(4.0*gb);
78 U = std::max(U-A,0.0);
79 if (U <= 0.0) { return 0.0; }
80
81 G4int Pf = P;
82 G4int Hf = H;
83 G4int Nf = N-1;
84 for (G4int i = 1; i < theA; ++i) {
85 Pf *= (P-i);
86 Hf *= (H-i);
87 Nf *= (N-1-i);
88 }
89
90 G4double X = std::max(Up - Ab + GetBeta(),0.0);
91 G4double Y = std::max(Up - Ab - Low, 0.0);
92
94 *g4calc->Z23(theResA)*Pf*Hf*Nf*K(frag)*(X/Nb - Y/(Nb+1))
95 *U*g4calc->powN(gb*Y,Nb)/g4calc->powN(ga*U,N);
96
97 return Probability;
98}
G4double Y(G4double density)
double G4double
Definition G4Types.hh:83
int G4int
Definition G4Types.hh:85
const G4double A[17]
G4int GetNumberOfParticles() const
G4int GetNumberOfHoles() const
G4double GetExcitationEnergy() const
G4HETCFragment(const G4ParticleDefinition *, G4VCoulombBarrier *p=nullptr)
virtual G4double GetSpinFactor() const =0
G4double CalcEmissionProbability(const G4Fragment &aFragment) override
virtual G4double K(const G4Fragment &aFragment) const =0
G4double GetLevelDensity(G4int Z, G4int A, G4double U)
G4double powN(G4double x, G4int n) const
Definition G4Pow.cc:162
G4double Z23(G4int Z) const
Definition G4Pow.hh:125
G4DeexPrecoParameters * theParameters
virtual G4double GetAlpha() const =0
virtual G4double GetBeta() const
#define N
Definition crc32.c:57
G4double Probability(const G4int A, const G4FermiFragment *f1, const G4FermiFragment *f2, const G4double mass, const G4double exc)
const G4double Pf
Fermi momentum [MeV/c].