Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/pre_equilibrium/exciton_model/src/G4PreCompoundAlpha.cc

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 26 //
 27 // -------------------------------------------------------------------
 28 //
 29 // GEANT4 Class file
 30 //
 31 //
 32 // File name:     G4PreCompoundAlpha
 33 //
 34 // Author:         V.Lara
 35 //
 36 // Modified:  
 37 // 21.08.2008 J. M. Quesada add choice of options  
 38 // 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers
 39 //                         use int Z and A and cleanup
 40 // 05.07.2013 J.M. Quesada FactorialFactor fixed
 41 //
 42 
 43 #include "G4PreCompoundAlpha.hh"
 44 #include "G4CoulombBarrier.hh"
 45 #include "G4Alpha.hh"
 46 
 47 G4PreCompoundAlpha::G4PreCompoundAlpha()
 48   : G4PreCompoundIon(G4Alpha::Alpha(), new G4CoulombBarrier(4, 2))
 49 {}
 50 
 51 G4double G4PreCompoundAlpha::FactorialFactor(G4int N, G4int P) const
 52 {
 53   return static_cast<G4double>(((N-4)*(P-3)*(N-3)*(P-2))*((N-2)*(P-1)*(N-1)*P))
 54     /144.0;
 55 }
 56   
 57 G4double G4PreCompoundAlpha::CoalescenceFactor(G4int A) const
 58 {
 59   return 4096.0/static_cast<G4double>(A*A*A);
 60 }    
 61 
 62 G4double G4PreCompoundAlpha::GetAlpha() const
 63 {
 64   G4double C = 0.0;
 65   if (theFragZ <= 30) 
 66     {
 67       C = 0.10;
 68     } 
 69   else if (theFragZ <= 50) 
 70     {
 71       C = 0.1 - (theFragZ-30)*0.001;
 72     } 
 73   else if (theFragZ < 70) 
 74     {
 75       C = 0.08 - (theFragZ-50)*0.001;
 76     }
 77   else 
 78     {
 79       C = 0.06;
 80     }
 81   return 1.0+C;
 82 }
 83 
 84 G4double G4PreCompoundAlpha::GetRj(G4int nParticles, G4int nCharged) const
 85 {
 86   G4double rj = 0.0;
 87   if(nCharged >=2 && (nParticles-nCharged) >=2 ) {
 88     G4double denominator = (G4double)
 89       (nParticles*(nParticles-1))*((nParticles-2)*(nParticles-3));
 90     rj = (6.0*nCharged*(nCharged-1))*
 91       ((nParticles-nCharged)*(nParticles-nCharged-1))/denominator;
 92   }
 93   return rj;
 94 }
 95 
 96