Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/pre_equilibrium/exciton_model/src/G4HETCHe3.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 "G4HETCHe3.hh"
 34 #include "G4He3.hh"
 35 #include "G4CoulombBarrier.hh"
 36 
 37 G4HETCHe3::G4HETCHe3() 
 38   : G4HETCChargedFragment(G4He3::He3(), new G4CoulombBarrier(3, 2))
 39 {}
 40 
 41 G4double G4HETCHe3::GetAlpha() const
 42 {
 43   G4double C = 0.0;
 44   if (theFragZ <= 30) 
 45     {
 46       C = 0.10;
 47     } 
 48   else if (theFragZ <= 50) 
 49     {
 50       C = 0.1 - (theFragZ-30)*0.001;
 51     } 
 52   else if (theFragZ < 70) 
 53     {
 54       C = 0.08 - (theFragZ-70)*0.001;
 55     }
 56   else 
 57     {
 58       C = 0.06;
 59     }
 60   return 1.0 + C*(4.0/3.0);
 61 }
 62 
 63 G4double G4HETCHe3::GetSpinFactor() const
 64 {
 65   // 2s+1
 66   return 2.0;
 67 }    
 68 
 69 G4double G4HETCHe3::K(const G4Fragment& aFragment) const
 70 {
 71   // Number of protons in emitted fragment
 72   G4int Pa = theZ;
 73   // Number of neutrons in emitted fragment 
 74   G4int Na = theA - Pa;
 75 
 76   G4double r = G4double(theResZ)/G4double(theResA);
 77 
 78   G4int P = aFragment.GetNumberOfParticles();
 79   G4int H = aFragment.GetNumberOfHoles();
 80 
 81   G4double result = 0.0;
 82   if (P > 2)
 83     {
 84       result = 3.0/(P*(P-1.0)*(P-2.0)) * 
 85   (H*(H-1.0)*(H-2.0)*r*r*(r-1.0) +
 86    H*(H-1.0)*(2.0*Na*r*(1.0-r)+Pa*r*r) +
 87    H*(Pa*(Pa-1.0)*(r-1.0)+2.0*Na*Pa*r) +
 88    Pa*Na*(Pa-1.0));
 89 
 90       result /= 3.0*r*r*(1.0 - r);
 91     }
 92   return std::max(0.0,result);
 93 }
 94