Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/pre_equilibrium/exciton_model/src/G4HETCAlpha.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 "G4HETCAlpha.hh"
 34 #include "G4Alpha.hh"
 35 #include "G4CoulombBarrier.hh"
 36 
 37 G4HETCAlpha::G4HETCAlpha() 
 38   : G4HETCChargedFragment(G4Alpha::Alpha(), new G4CoulombBarrier(4, 2))
 39 {}
 40 
 41 G4double G4HETCAlpha::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;
 61 }
 62   
 63 G4double G4HETCAlpha::GetSpinFactor() const
 64 {
 65   return 1.0;
 66 }
 67 
 68 G4double G4HETCAlpha::K(const G4Fragment& aFragment) const
 69 {
 70   // Number of protons in emitted fragment
 71   G4int Pa = theZ;
 72   // Number of neutrons in emitted fragment 
 73   G4int Na = theA - Pa;
 74 
 75   G4double r = G4double(theResZ)/G4double(theResA);
 76 
 77   G4int P = aFragment.GetNumberOfParticles();
 78   G4int H = aFragment.GetNumberOfHoles();
 79 
 80   G4double result = 0.0;
 81   if (P > 3)
 82     {
 83       result = 3.0/(P*(P-1.0)*(P-2.0)*(P-3.0)) * 
 84   (H*(H-1.0)*(H-2.0)*(H-3.0)*r*r*(r-1.0)*(r-1.0) +
 85    2.0*H*(H-1.0)*(H-2.0)*(Pa*r*(1.0-r)*(1.0-r)+Na*r*r*(1.0-r)) +
 86    H*(H-1.0)*(Pa*(Pa-1.0)*(1.0-r)*(1.0-r)+
 87          4.0*Na*Pa*r*(1.0-r)+Na*(Na-1.0)*r*r) +
 88    2*H*(Pa*Na*(Na-1.0)*r+Pa*(Pa-1.0)*Na*(1.0-r)) +
 89    Pa*(Pa-1.0)*Na*(Na-1.0));
 90 
 91       result /= (6.0*r*r*(1. - r) *(1. - r));
 92     }
 93   return std::max(0.0,result);
 94 }
 95