G4PreCompoundNucleon.cc

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00025 //
00026 // $Id$
00027 //
00028 // -------------------------------------------------------------------
00029 //
00030 // GEANT4 Class file
00031 //
00032 //
00033 // File name:     G4PreCompoundNucleon
00034 //
00035 // Author:         V.Lara
00036 //
00037 // Modified:  
00038 // 10.02.2009 J. M. Quesada cleanup
00039 // 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers
00040 //                         use int Z and A and cleanup
00041 //
00042 
00043 #include "G4PreCompoundNucleon.hh"
00044 #include "G4PhysicalConstants.hh"
00045 #include "G4SystemOfUnits.hh"
00046 
00047 G4PreCompoundNucleon::
00048 G4PreCompoundNucleon(const G4ParticleDefinition* part,
00049                       G4VCoulombBarrier* aCoulombBarrier)
00050   : G4PreCompoundFragment(part,aCoulombBarrier)
00051 {
00052   fact = 2*CLHEP::millibarn/(CLHEP::pi2*CLHEP::hbarc*CLHEP::hbarc*CLHEP::hbarc);
00053 }
00054 
00055 G4PreCompoundNucleon::~G4PreCompoundNucleon()
00056 {}
00057 
00058 G4double G4PreCompoundNucleon::
00059 ProbabilityDistributionFunction(G4double eKin, 
00060                                 const G4Fragment& aFragment)
00061 {
00062   if ( !IsItPossible(aFragment) ) { return 0.0; }
00063 
00064   G4double U = aFragment.GetExcitationEnergy();
00065   G4int P = aFragment.GetNumberOfParticles();
00066   G4int H = aFragment.GetNumberOfHoles();
00067   G4int N = P + H;
00068 
00069   G4double g0 = (6.0/pi2)*aFragment.GetA_asInt()*theParameters->GetLevelDensity();
00070   G4double g1 = (6.0/pi2)*GetRestA()*theParameters->GetLevelDensity();
00071   
00072   G4double A0 = G4double(P*P+H*H+P-3*H)/(4.0*g0);
00073   G4double A1 = (A0 - 0.5*P)/g1;  
00074 
00075   G4double E0 = U - A0;
00076   if (E0 <= 0.0) { return 0.0; }
00077 
00078   G4double E1 = U - eKin - GetBindingEnergy() - A1;
00079   if (E1 <= 0.0) { return 0.0; }
00080 
00081   G4double rj = GetRj(P, aFragment.GetNumberOfCharged());
00082   G4double xs = CrossSection(eKin);
00083 
00084   if (rj <0.0 || xs < 0.0) {  
00085     std::ostringstream errOs;
00086     G4cout<<"WARNING:  NEGATIVE VALUES "<<G4endl;     
00087     errOs << "Rj=" << rj <<"  xsec("
00088           <<eKin/MeV<<" MeV)= "<< xs <<"  A= "<<GetA()<<"  Z= "<<GetZ()
00089           <<G4endl;
00090     throw G4HadronicException(__FILE__, __LINE__, errOs.str());
00091   }
00092 
00093   G4double Probability = fact * GetReducedMass() * rj * xs * eKin * P * (N-1) 
00094     * g4pow->powN(g1*E1/(g0*E0),N-2) * g1 / (E0*g0*g0);
00095   
00096   /*
00097   G4double Probability = 1.0/pi2*2.0/(hbarc*hbarc*hbarc) * GetReducedMass()
00098     * GetRj(aFragment.GetNumberOfParticles(), aFragment.GetNumberOfCharged())  
00099     * eKin*CrossSection(eKin)*millibarn * P*(N-1.0) * 
00100    std::pow(g1*E1/(g0*E0),N-2.0)/E0 * g1/(g0*g0);
00101   */
00102 
00103   return Probability;
00104 }
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