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1 // 1 //
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19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // 26 //
27 // Hadronic Process: Nuclear De-excitations 27 // Hadronic Process: Nuclear De-excitations
28 // by V. Lara (Dec 1999) 28 // by V. Lara (Dec 1999)
29 // 29 //
30 // 14-11-2007 modified barrier by JMQ (test30) 30 // 14-11-2007 modified barrier by JMQ (test30)
31 // 15-11-2010 V.Ivanchenko use G4Pow and clean 31 // 15-11-2010 V.Ivanchenko use G4Pow and cleanup
32 32
33 #include "G4CoulombBarrier.hh" 33 #include "G4CoulombBarrier.hh"
34 #include "G4PhysicalConstants.hh" 34 #include "G4PhysicalConstants.hh"
35 #include "G4SystemOfUnits.hh" 35 #include "G4SystemOfUnits.hh"
36 #include "G4NuclearRadii.hh" 36 #include "G4NuclearRadii.hh"
37 37
38 G4CoulombBarrier::G4CoulombBarrier(G4int A, G4 38 G4CoulombBarrier::G4CoulombBarrier(G4int A, G4int Z)
39 : G4VCoulombBarrier(A, Z) 39 : G4VCoulombBarrier(A, Z)
40 { 40 {
41 factor = CLHEP::elm_coupling*Z; 41 factor = CLHEP::elm_coupling*Z;
42 SetParameters(0.4*G4NuclearRadii::RadiusCB(Z 42 SetParameters(0.4*G4NuclearRadii::RadiusCB(Z, A), 1.5*CLHEP::fermi);
43 } 43 }
44 44
45 G4double G4CoulombBarrier::GetCoulombBarrier( 45 G4double G4CoulombBarrier::GetCoulombBarrier(
46 G4int ARes, G4int ZRes, G4double U) c 46 G4int ARes, G4int ZRes, G4double U) const
47 { 47 {
48 if (0 == theZ) { return 0.0; } << 48 if(0 == theZ) { return 0.0; }
49 G4double cb = factor*ZRes/(G4NuclearRadii::R 49 G4double cb = factor*ZRes/(G4NuclearRadii::RadiusCB(ZRes,ARes) + theRho);
50 if (U > 0.0) { cb /= (1.0 + std::sqrt( U/((2 << 50 if(U > 0.0) { cb /= (1.0 + std::sqrt( U/((2*ARes)*CLHEP::MeV) )); }
51 return cb; 51 return cb;
52 } 52 }
53 53
54 G4double G4CoulombBarrier::BarrierPenetrationF 54 G4double G4CoulombBarrier::BarrierPenetrationFactor(G4int aZ) const
55 { 55 {
56 // Data comes from 56 // Data comes from
57 // Dostrovsky, Fraenkel and Friedlander 57 // Dostrovsky, Fraenkel and Friedlander
58 // Physical Review, vol 116, num. 3 1959 58 // Physical Review, vol 116, num. 3 1959
59 // 59 //
60 // const G4int size = 5; 60 // const G4int size = 5;
61 // const G4double Zlist[size] = {10.0, 20.0, 61 // const G4double Zlist[size] = {10.0, 20.0, 30.0, 50.0, 70.0};
62 // const G4double Kprot[size] = {0.42, 0.58, 62 // const G4double Kprot[size] = {0.42, 0.58, 0.68, 0.77, 0.80};
63 // 63 //
64 G4double res = 1.0; 64 G4double res = 1.0;
65 if(theZ == 1) { 65 if(theZ == 1) {
66 res = (aZ >= 70) ? 0.80 : 66 res = (aZ >= 70) ? 0.80 :
67 (((0.2357e-5*aZ) - 0.42679e-3)*aZ + 0.2703 67 (((0.2357e-5*aZ) - 0.42679e-3)*aZ + 0.27035e-1)*aZ + 0.19025;
68 res += 0.06*(theA - 1); 68 res += 0.06*(theA - 1);
69 69
70 } else if(theZ == 2 && theA <= 4) { 70 } else if(theZ == 2 && theA <= 4) {
71 res = (aZ >= 70) ? 0.98 : 71 res = (aZ >= 70) ? 0.98 :
72 (((0.23684e-5*aZ) - 0.42143e-3)*aZ + 0.252 72 (((0.23684e-5*aZ) - 0.42143e-3)*aZ + 0.25222e-1)*aZ + 0.46699;
73 res += 0.12*(4 - theA); 73 res += 0.12*(4 - theA);
74 } 74 }
75 return res; 75 return res;
76 } 76 }
77 77