Geant4  10.01.p03
G4PreCompoundNucleon.cc
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26 // $Id: G4PreCompoundNucleon.cc 68028 2013-03-13 13:48:15Z gcosmo $
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28 // -------------------------------------------------------------------
29 //
30 // GEANT4 Class file
31 //
32 //
33 // File name: G4PreCompoundNucleon
34 //
35 // Author: V.Lara
36 //
37 // Modified:
38 // 10.02.2009 J. M. Quesada cleanup
39 // 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers
40 // use int Z and A and cleanup
41 //
42 
43 #include "G4PreCompoundNucleon.hh"
44 #include "G4PhysicalConstants.hh"
45 #include "G4SystemOfUnits.hh"
46 
49  G4VCoulombBarrier* aCoulombBarrier)
50  : G4PreCompoundFragment(part,aCoulombBarrier)
51 {
52  fact = 2*CLHEP::millibarn/(CLHEP::pi2*CLHEP::hbarc*CLHEP::hbarc*CLHEP::hbarc);
53 }
54 
56 {}
57 
60  const G4Fragment& aFragment)
61 {
62  if ( !IsItPossible(aFragment) ) { return 0.0; }
63 
64  G4double U = aFragment.GetExcitationEnergy();
65  G4int P = aFragment.GetNumberOfParticles();
66  G4int H = aFragment.GetNumberOfHoles();
67  G4int N = P + H;
68 
69  G4double g0 = (6.0/pi2)*aFragment.GetA_asInt()*theParameters->GetLevelDensity();
70  G4double g1 = (6.0/pi2)*GetRestA()*theParameters->GetLevelDensity();
71 
72  G4double A0 = G4double(P*P+H*H+P-3*H)/(4.0*g0);
73  G4double A1 = (A0 - 0.5*P)/g1;
74 
75  G4double E0 = U - A0;
76  if (E0 <= 0.0) { return 0.0; }
77 
78  G4double E1 = U - eKin - GetBindingEnergy() - A1;
79  if (E1 <= 0.0) { return 0.0; }
80 
81  G4double rj = GetRj(P, aFragment.GetNumberOfCharged());
82  G4double xs = CrossSection(eKin);
83 
84  if (rj <0.0 || xs < 0.0) {
85  std::ostringstream errOs;
86  G4cout<<"WARNING: NEGATIVE VALUES "<<G4endl;
87  errOs << "Rj=" << rj <<" xsec("
88  <<eKin/MeV<<" MeV)= "<< xs <<" A= "<<GetA()<<" Z= "<<GetZ()
89  <<G4endl;
90  throw G4HadronicException(__FILE__, __LINE__, errOs.str());
91  }
92 
93  G4double Probability = fact * GetReducedMass() * rj * xs * eKin * P * (N-1)
94  * g4pow->powN(g1*E1/(g0*E0),N-2) * g1 / (E0*g0*g0);
95 
96  /*
97  G4double Probability = 1.0/pi2*2.0/(hbarc*hbarc*hbarc) * GetReducedMass()
98  * GetRj(aFragment.GetNumberOfParticles(), aFragment.GetNumberOfCharged())
99  * eKin*CrossSection(eKin)*millibarn * P*(N-1.0) *
100  std::pow(g1*E1/(g0*E0),N-2.0)/E0 * g1/(g0*g0);
101  */
102 
103  return Probability;
104 }
105 
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120 
static const double MeV
Definition: G4SIunits.hh:193
G4double powN(G4double x, G4int n) const
Definition: G4Pow.cc:128
G4double GetReducedMass() const
G4int GetA() const
virtual G4double GetRj(G4int NumberParticles, G4int NumberCharged)=0
G4int GetNumberOfParticles() const
Definition: G4Fragment.hh:330
G4bool IsItPossible(const G4Fragment &aFragment) const
int G4int
Definition: G4Types.hh:78
G4double GetBindingEnergy() const
G4int GetNumberOfHoles() const
Definition: G4Fragment.hh:350
G4GLOB_DLL std::ostream G4cout
G4int GetA_asInt() const
Definition: G4Fragment.hh:243
virtual G4double ProbabilityDistributionFunction(G4double eKin, const G4Fragment &aFragment)
static const double millibarn
Definition: G4SIunits.hh:96
G4int GetRestA() const
G4PreCompoundParameters * theParameters
#define G4endl
Definition: G4ios.hh:61
G4int GetZ() const
double G4double
Definition: G4Types.hh:76
G4int GetNumberOfCharged() const
Definition: G4Fragment.hh:335
G4double GetExcitationEnergy() const
Definition: G4Fragment.hh:260
virtual G4double CrossSection(G4double ekin)=0