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G4PreCompoundNucleon.cc
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27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4PreCompoundNucleon
33 //
34 // Author: V.Lara
35 //
36 // Modified:
37 // 10.02.2009 J. M. Quesada cleanup
38 // 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers
39 // use int Z and A and cleanup
40 //
41 
42 #include "G4PreCompoundNucleon.hh"
43 #include "G4PhysicalConstants.hh"
44 #include "G4NuclearLevelData.hh"
45 #include "G4SystemOfUnits.hh"
46 
48  const G4ParticleDefinition* part, G4VCoulombBarrier* aCoulombBarrier)
49  : G4PreCompoundFragment(part,aCoulombBarrier)
50 {}
51 
53 {}
54 
57  const G4Fragment& aFragment)
58 {
59  G4double U = aFragment.GetExcitationEnergy();
60  G4int P = aFragment.GetNumberOfParticles();
61  G4int H = aFragment.GetNumberOfHoles();
62  G4int N = P + H;
63 
64  static const G4double sixoverpi2 = 6.0/CLHEP::pi2;
65  G4double g0 = sixoverpi2*fNucData->GetLevelDensity(theFragZ, theFragA, U);
66  G4double g1 = sixoverpi2*fNucData->GetLevelDensity(theResZ, theResA, 0.0);
67 
68  G4double A0 = G4double(P*P+H*H+P-3*H)/(4.0*g0);
69  G4double A1 = (A0 - 0.5*P)/g1;
70 
71  G4double E0 = U - A0;
72  if (E0 <= 0.0) { return 0.0; }
73 
74  G4double E1 = U - eKin - theBindingEnergy - A1;
75  if (E1 <= 0.0) { return 0.0; }
76 
77  G4double rj = GetRj(P, aFragment.GetNumberOfCharged());
78  G4double xs = CrossSection(eKin);
79 
80  if (rj <0.0 || xs < 0.0) { return 0.0; }
81 
82  static const G4double fact = 2*CLHEP::millibarn
84  G4double Probability = fact * theReducedMass * rj * xs * eKin * P * (N-1)
85  * g4calc->powN(g1*E1/(g0*E0),N-2) * g1 / (E0*g0*g0);
86 
87  //G4cout << "N= " << N << " g0= " << g0 << " g1= " << g1 << " E0= " << E0 << " E1= " << E1
88  // << " prob= " << Probability << G4endl;
89 
90  return Probability;
91 }
92 
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