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G4IonsSihverCrossSection.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file G4IonsSihverCrossSection.cc
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25 //
26 // 18-Sep-2003 First version is written by T. Koi
27 // 23-Dec-2006 Isotope dependence added by D. Wright
28 // 14-Mar-2011 Moved constructor, destructor and virtual methods to source by V.Ivanchenko
29 // 19-Aug-2011 V.Ivanchenko move to new design and make x-section per element
30 //
31 
33 #include "G4PhysicalConstants.hh"
34 #include "G4SystemOfUnits.hh"
35 #include "G4DynamicParticle.hh"
36 #include "G4HadTmpUtil.hh"
37 #include "G4NistManager.hh"
38 #include "G4Pow.hh"
39 
41  : G4VCrossSectionDataSet("IonsSihver"), square_r0 ( (1.36*fermi) * (1.36*fermi) )
42 {}
43 
45 {}
46 
47 void
49 {
50  outFile << "G4IonsSihverCrossSection calculates the total reaction cross\n"
51  << "section for nucleus-nucleus scattering using the Sihver\n"
52  << "parameterization. It is valid for projectiles and targets of\n"
53  << "all Z, and for all projectile energies above 100 MeV/n.\n";
54 }
55 
56 G4bool
58  G4int, const G4Material*)
59 {
60  G4int BaryonNumber = aDP->GetDefinition()->GetBaryonNumber();
61  G4double KineticEnergy = aDP->GetKineticEnergy();
62  if ( KineticEnergy / BaryonNumber >= 100*MeV && BaryonNumber > 1 ) { return true; }
63  return false;
64 }
65 
66 G4double
68  const G4DynamicParticle* aParticle, G4int Z, const G4Material*)
69 {
70  G4double xsection = 0.0;
71  G4int At = G4lrint(G4NistManager::Instance()->GetAtomicMassAmu(Z));
72 
73  G4int Ap = aParticle->GetDefinition()->GetBaryonNumber();
74 
75  G4Pow* g4pow = G4Pow::GetInstance();
76 
77  G4double cubicrAt = g4pow->Z13(At);
78  G4double cubicrAp = g4pow->Z13(Ap);
79 
80  G4double b0 = 1.581 - 0.876 * (1.0/cubicrAp + 1.0/cubicrAt);
81 
82  G4double xr = cubicrAp + cubicrAt - b0 * (1.0/cubicrAp + 1.0/cubicrAt);
83  xsection = pi * square_r0 * xr * xr;
84 
85  return xsection;
86 }
87