| Geant4 Cross Reference |
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25 //
26 //
27 // Hadronic Process: Nuclear De-excitations
28 // by V. Lara (Dec 1999)
29 //
30 // 14-11-2007 modified barrier by JMQ (test30)
31 // 15-11-2010 V.Ivanchenko use G4Pow and clean
32
33 #include "G4CoulombBarrier.hh"
34 #include "G4PhysicalConstants.hh"
35 #include "G4SystemOfUnits.hh"
36 #include "G4NuclearRadii.hh"
37
38 G4CoulombBarrier::G4CoulombBarrier(G4int A, G4
39 : G4VCoulombBarrier(A, Z)
40 {
41 factor = CLHEP::elm_coupling*Z;
42 SetParameters(0.4*G4NuclearRadii::RadiusCB(Z
43 }
44
45 G4double G4CoulombBarrier::GetCoulombBarrier(
46 G4int ARes, G4int ZRes, G4double U) c
47 {
48 if (0 == theZ) { return 0.0; }
49 G4double cb = factor*ZRes/(G4NuclearRadii::R
50 if (U > 0.0) { cb /= (1.0 + std::sqrt( U/((2
51 return cb;
52 }
53
54 G4double G4CoulombBarrier::BarrierPenetrationF
55 {
56 // Data comes from
57 // Dostrovsky, Fraenkel and Friedlander
58 // Physical Review, vol 116, num. 3 1959
59 //
60 // const G4int size = 5;
61 // const G4double Zlist[size] = {10.0, 20.0,
62 // const G4double Kprot[size] = {0.42, 0.58,
63 //
64 G4double res = 1.0;
65 if(theZ == 1) {
66 res = (aZ >= 70) ? 0.80 :
67 (((0.2357e-5*aZ) - 0.42679e-3)*aZ + 0.2703
68 res += 0.06*(theA - 1);
69
70 } else if(theZ == 2 && theA <= 4) {
71 res = (aZ >= 70) ? 0.98 :
72 (((0.23684e-5*aZ) - 0.42143e-3)*aZ + 0.252
73 res += 0.12*(4 - theA);
74 }
75 return res;
76 }
77