G4HETCAlpha.cc

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00025 //
00026 // $Id$
00027 //
00028 // by V. Lara
00029 //
00030 // Modified:
00031 // 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor 
00032 //            the source, use G4Pow
00033 
00034 #include "G4HETCAlpha.hh"
00035 #include "G4Alpha.hh"
00036 
00037 G4HETCAlpha::G4HETCAlpha() 
00038   : G4HETCChargedFragment(G4Alpha::Alpha(), &theAlphaCoulombBarrier)
00039 {}
00040 
00041 G4HETCAlpha::~G4HETCAlpha() 
00042 {}
00043 
00044 G4double G4HETCAlpha::GetAlpha()
00045 {
00046   G4double C = 0.0;
00047   G4int aZ = GetZ() + GetRestZ();
00048   if (aZ <= 30) 
00049     {
00050       C = 0.10;
00051     } 
00052   else if (aZ <= 50) 
00053     {
00054       C = 0.1 + -((aZ-50.)/20.)*0.02;
00055     }
00056   else if (aZ < 70) 
00057     {
00058       C = 0.08 + -((aZ-70.)/20.)*0.02;
00059     }
00060   else 
00061     {
00062       C = 0.06;
00063     }
00064   return 1.0+C;
00065 }
00066   
00067 G4double G4HETCAlpha::GetBeta()
00068 {
00069   return -GetCoulombBarrier();
00070 }
00071   
00072 G4double G4HETCAlpha::GetSpinFactor()
00073 {
00074   return 1.0;
00075 }
00076 
00077 G4double G4HETCAlpha::K(const G4Fragment & aFragment)
00078 {
00079   // Number of protons in emitted fragment
00080   G4int Pa = GetZ();
00081   // Number of neutrons in emitted fragment 
00082   G4int Na = GetA() - Pa;
00083 
00084   G4int TargetZ = GetRestZ();
00085   G4int TargetA = GetRestA();
00086   G4double r = G4double(TargetZ)/G4double(TargetA);
00087 
00088   G4int P = aFragment.GetNumberOfParticles();
00089   G4int H = aFragment.GetNumberOfHoles();
00090 
00091   G4double result = 0.0;
00092   if (P > 3)
00093     {
00094       result = 3.0/(P*(P-1.0)*(P-2.0)*(P-3.0)) * 
00095         (H*(H-1.0)*(H-2.0)*(H-3.0)*r*r*(r-1.0)*(r-1.0) +
00096          2.0*H*(H-1.0)*(H-2.0)*(Pa*r*(1.0-r)*(1.0-r)+Na*r*r*(1.0-r)) +
00097          H*(H-1.0)*(Pa*(Pa-1.0)*(1.0-r)*(1.0-r)+4.0*Na*Pa*r*(1.0-r)+Na*(Na-1.0)*r*r) +
00098          2*H*(Pa*Na*(Na-1.0)*r+Pa*(Pa-1.0)*Na*(1.0-r)) +
00099          Pa*(Pa-1.0)*Na*(Na-1.0));
00100 
00101       result /= 6.0*r*r*(1. - r) *(1. - r);
00102     }
00103   return std::max(0.0,result);
00104 }

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