| Geant4 Cross Reference |
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25 //
26 //
27 // 20.08.2010 V.Ivanchenko move constructor and destructor to the source
28
29 #include "G4GNASHTransitions.hh"
30 #include "G4PhysicalConstants.hh"
31 #include "G4SystemOfUnits.hh"
32 #include "G4NuclearLevelData.hh"
33 #include "G4DeexPrecoParameters.hh"
34 #include "G4HadronicException.hh"
35 #include "Randomize.hh"
36
37 G4GNASHTransitions::G4GNASHTransitions()
38 {
39 theParameters = G4NuclearLevelData::GetInstance()->GetParameters();
40 }
41
42 G4GNASHTransitions::~G4GNASHTransitions()
43 {}
44
45 G4double G4GNASHTransitions::
46 CalculateProbability(const G4Fragment & aFragment)
47 {
48 static const G4double k = 135.0 *CLHEP::MeV*CLHEP::MeV*CLHEP::MeV;
49 G4double E = aFragment.GetExcitationEnergy();
50 G4double P = aFragment.GetNumberOfParticles();
51 G4double H = aFragment.GetNumberOfHoles();
52 G4double N = P + H;
53 G4int Z = aFragment.GetZ_asInt();
54 G4int A = aFragment.GetA_asInt();
55
56 G4double theMatrixElement(k*N/((A*A*A)*E));
57 G4double x = E/(N*CLHEP::MeV);
58 static const G4double xf = std::sqrt(2.0/7.0);
59 if ( x < 2.0) { x *= xf; }
60 else if ( x < 7.0) { x *= std::sqrt(x/7.0); }
61 else if ( x > 15.0){ x *= std::sqrt(15.0/x); }
62 theMatrixElement *= x;
63
64 G4double gg = (6.0/pi2)*G4NuclearLevelData::GetInstance()->GetLevelDensity(Z,A,E);
65
66 G4double Epauli = ((P+1.0)*(P+1.0) + (H+1.0)*(H+1.0) + (P+1.0) - 3.0*(H-1.0))*0.25;
67
68 G4double Probability = gg*gg*gg *(E-Epauli)*(E-Epauli);
69 Probability *= theMatrixElement/(2.0*(N+1.0)*CLHEP::h_Planck);
70
71 return Probability;
72 }
73
74 void G4GNASHTransitions::PerformTransition(G4Fragment & result)
75 {
76 result.SetNumberOfParticles(result.GetNumberOfParticles()+1);
77 result.SetNumberOfHoles(result.GetNumberOfHoles()+1);
78 if (G4UniformRand()*result.GetA_asInt() <= G4double(result.GetZ_asInt()))
79 {
80 result.SetNumberOfCharged(result.GetNumberOfCharged()+1);
81 }
82
83 if (result.GetNumberOfParticles() < result.GetNumberOfCharged())
84 {
85 result.SetNumberOfCharged(result.GetNumberOfParticles());
86 }
87 }
88