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25 // 25 //
>> 26 // $Id: G4CoulombBarrier.cc,v 1.10 2010-11-15 12:44:06 vnivanch Exp $
>> 27 // GEANT4 tag $Name: not supported by cvs2svn $
26 // 28 //
27 // Hadronic Process: Nuclear De-excitations 29 // Hadronic Process: Nuclear De-excitations
28 // by V. Lara (Dec 1999) 30 // by V. Lara (Dec 1999)
29 // 31 //
30 // 14-11-2007 modified barrier by JMQ (test30) 32 // 14-11-2007 modified barrier by JMQ (test30)
31 // 15-11-2010 V.Ivanchenko use G4Pow and clean 33 // 15-11-2010 V.Ivanchenko use G4Pow and cleanup
32 34
33 #include "G4CoulombBarrier.hh" 35 #include "G4CoulombBarrier.hh"
34 #include "G4PhysicalConstants.hh" << 36 #include "G4HadronicException.hh"
35 #include "G4SystemOfUnits.hh" << 37 #include "G4Pow.hh"
36 #include "G4NuclearRadii.hh" << 38 #include <sstream>
37 39
38 G4CoulombBarrier::G4CoulombBarrier(G4int A, G4 << 40 G4CoulombBarrier::G4CoulombBarrier(): G4VCoulombBarrier(1,0)
39 : G4VCoulombBarrier(A, Z) << 41 {}
40 { << 42
41 factor = CLHEP::elm_coupling*Z; << 43 G4CoulombBarrier::G4CoulombBarrier(G4int anA, G4int aZ)
42 SetParameters(0.4*G4NuclearRadii::RadiusCB(Z << 44 : G4VCoulombBarrier(anA,aZ)
43 } << 45 {}
>> 46
>> 47 G4CoulombBarrier::~G4CoulombBarrier()
>> 48 {}
44 49
45 G4double G4CoulombBarrier::GetCoulombBarrier( << 50 G4double G4CoulombBarrier::BarrierPenetrationFactor(G4double ) const
46 G4int ARes, G4int ZRes, G4double U) c <<
47 { 51 {
48 if (0 == theZ) { return 0.0; } << 52 return 1.0;
49 G4double cb = factor*ZRes/(G4NuclearRadii::R <<
50 if (U > 0.0) { cb /= (1.0 + std::sqrt( U/((2 <<
51 return cb; <<
52 } 53 }
53 54
54 G4double G4CoulombBarrier::BarrierPenetrationF << 55 G4double G4CoulombBarrier::GetCoulombBarrier(const G4int ARes, const G4int ZRes, const G4double) const
>> 56 // Calculation of Coulomb potential energy (barrier) for outgoing fragment
55 { 57 {
56 // Data comes from << 58 G4double Barrier = 0.0;
57 // Dostrovsky, Fraenkel and Friedlander << 59 if (ZRes > ARes || ARes < 1) {
58 // Physical Review, vol 116, num. 3 1959 << 60 std::ostringstream errOs;
59 // << 61 errOs << "G4CoulombBarrier::GetCoulombBarrier: ";
60 // const G4int size = 5; << 62 errOs << "Wrong values for ";
61 // const G4double Zlist[size] = {10.0, 20.0, << 63 errOs << "residual nucleus A = " << ARes << " ";
62 // const G4double Kprot[size] = {0.42, 0.58, << 64 errOs << "and residual nucleus Z = " << ZRes << G4endl;
63 // << 65
64 G4double res = 1.0; << 66 throw G4HadronicException(__FILE__, __LINE__, errOs.str());
65 if(theZ == 1) { << 67 }
66 res = (aZ >= 70) ? 0.80 : << 68 if (GetA() == 1 && GetZ() == 0) {
67 (((0.2357e-5*aZ) - 0.42679e-3)*aZ + 0.2703 << 69 Barrier = 0.0; // Neutron Coulomb Barrier is 0
68 res += 0.06*(theA - 1); << 70 } else {
69 << 71
70 } else if(theZ == 2 && theA <= 4) { << 72 // JMQ: old coulomb barrier commented since it does not agree with Dostrovski's prescription
71 res = (aZ >= 70) ? 0.98 : << 73 // and too low barriers are obtained (for protons at least)
72 (((0.23684e-5*aZ) - 0.42143e-3)*aZ + 0.252 << 74 // calculation of K penetration factor is correct
73 res += 0.12*(4 - theA); << 75 // G4double CompoundRadius = CalcCompoundRadius(static_cast<G4double>(ZRes));
>> 76 // Barrier = elm_coupling/CompoundRadius * static_cast<G4double>(GetZ())*static_cast<G4double>(ZRes)/
>> 77 // (std::pow(static_cast<G4double>(GetA()),1./3.) + std::pow(static_cast<G4double>(ARes),1./3.));
>> 78
>> 79 ///New coulomb Barrier according to original Dostrovski's paper
>> 80 G4double rho=1.2*fermi;
>> 81 if(GetA()==1 && GetZ()==1){ rho=0.0;}
>> 82
>> 83 G4double RN=1.5*fermi;
>> 84 // VI cleanup
>> 85 Barrier=elm_coupling*(GetZ()*ZRes)/(RN * G4Pow::GetInstance()->Z13(ARes) + rho);
>> 86
>> 87 // Barrier penetration coeficient
>> 88 G4double K = BarrierPenetrationFactor(ZRes);
>> 89
>> 90 Barrier *= K;
>> 91
>> 92 // JMQ : the following statement has unknown origin and dimensionally is meaningless( energy divided by mass number in argument of sqrt function). Energy dependence of Coulomb barrier penetrability should be included in proper way (if needed..)
>> 93 // Barrier /= (1.0 + std::sqrt(U/(2.0*static_cast<G4double>(ARes))));
>> 94 //
74 } 95 }
75 return res; << 96 return Barrier;
76 } 97 }
>> 98
>> 99
>> 100
77 101