| Geant4 Cross Reference |
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25 // 25 //
26 // 18-Sep-2003 First version is written by T. 26 // 18-Sep-2003 First version is written by T. Koi
27 // 12-Nov-2003 Add energy check at lower side 27 // 12-Nov-2003 Add energy check at lower side T. Koi
28 // 15-Nov-2006 Above 10GeV/n Cross Section bec 28 // 15-Nov-2006 Above 10GeV/n Cross Section become constant T. Koi (SLAC/SCCS)
29 // 23-Dec-2006 Isotope dependence adde by D. W 29 // 23-Dec-2006 Isotope dependence adde by D. Wright
30 // 14-Mar-2011 Moved constructor, destructor a <<
31 // 19-Aug-2011 V.Ivanchenko move to new design <<
32 // 30 //
33 31
34 #include "G4IonsShenCrossSection.hh" 32 #include "G4IonsShenCrossSection.hh"
35 #include "G4PhysicalConstants.hh" << 33 #include "G4ParticleTable.hh"
36 #include "G4SystemOfUnits.hh" << 34 #include "G4IonTable.hh"
37 #include "G4DynamicParticle.hh" <<
38 #include "G4NucleiProperties.hh" <<
39 #include "G4HadTmpUtil.hh" 35 #include "G4HadTmpUtil.hh"
40 #include "G4NistManager.hh" <<
41 36
42 G4IonsShenCrossSection::G4IonsShenCrossSection <<
43 : G4VCrossSectionDataSet("IonsShen"), <<
44 upperLimit( 10*GeV ), <<
45 // lowerLimit( 10*MeV ), <<
46 r0 ( 1.1 ) <<
47 {} <<
48 <<
49 G4IonsShenCrossSection::~G4IonsShenCrossSectio <<
50 {} <<
51 <<
52 void <<
53 G4IonsShenCrossSection::CrossSectionDescriptio <<
54 { <<
55 outFile << "G4IonsShenCrossSection calculate <<
56 << "section for nucleus-nucleus scat <<
57 << "parameterization. It is valid f <<
58 << "all Z, and projectile energies u <<
59 << "the cross section is constant. <<
60 << "is returned.\n"; <<
61 } <<
62 <<
63 G4bool G4IonsShenCrossSection::IsElementApplic <<
64 G4int, const G4Material*) <<
65 { <<
66 return (1 <= aDP->GetDefinition()->GetBaryon <<
67 } <<
68 <<
69 G4double <<
70 G4IonsShenCrossSection::GetElementCrossSection <<
71 G4int Z, <<
72 const G4Material*) <<
73 { <<
74 G4int A = G4lrint(G4NistManager::Instance()- <<
75 return GetIsoCrossSection(aParticle, Z, A); <<
76 } <<
77 <<
78 G4double G4IonsShenCrossSection::GetIsoCrossSe <<
79 G4int Zt, G4int At, <<
80 const G4Isotope*, <<
81 const G4Element*, <<
82 const G4Material*) <<
83 37
>> 38 G4double G4IonsShenCrossSection::
>> 39 GetZandACrossSection(const G4DynamicParticle* aParticle, G4int ZZ,
>> 40 G4int AA, G4double /*temperature*/)
84 { 41 {
85 G4double xsection = 0.0; 42 G4double xsection = 0.0;
86 43
87 G4int Ap = aParticle->GetDefinition()->GetB 44 G4int Ap = aParticle->GetDefinition()->GetBaryonNumber();
88 G4int Zp = G4lrint(aParticle->GetDefinition << 45 G4int Zp = G4int(aParticle->GetDefinition()->GetPDGCharge()/eplus + 0.5 );
89 G4double ke_per_N = aParticle->GetKineticEn 46 G4double ke_per_N = aParticle->GetKineticEnergy() / Ap;
90 if ( ke_per_N > upperLimit ) { ke_per_N = u << 47 if ( ke_per_N > 10*GeV ) ke_per_N = 10*GeV;
91 48
92 // Apply energy check, if less than lower l << 49 // Apply energy check, if less than lower limit then 0 value is returned
93 //if ( ke_per_N < lowerLimit ) { return xs << 50 // if ( ke_per_N < lowerLimit ) return xsection;
94 51
95 G4Pow* g4pow = G4Pow::GetInstance(); << 52 G4int At = AA;
96 << 53 G4int Zt = ZZ;
97 G4double cubicrAt = g4pow->Z13(At); <<
98 G4double cubicrAp = g4pow->Z13(Ap); <<
99 54
>> 55 G4double one_third = 1.0 / 3.0;
>> 56
>> 57 G4double cubicrAt = std::pow ( G4double(At) , G4double(one_third) );
>> 58 G4double cubicrAp = std::pow ( G4double(Ap) , G4double(one_third) );
>> 59
100 G4double Rt = 1.12 * cubicrAt - 0.94 * ( 1. 60 G4double Rt = 1.12 * cubicrAt - 0.94 * ( 1.0 / cubicrAt );
101 G4double Rp = 1.12 * cubicrAp - 0.94 * ( 1. 61 G4double Rp = 1.12 * cubicrAp - 0.94 * ( 1.0 / cubicrAp );
102 62
103 G4double r = Rt + Rp + 3.2; // in fm 63 G4double r = Rt + Rp + 3.2; // in fm
104 G4double b = 1.0; // in MeV/fm 64 G4double b = 1.0; // in MeV/fm
105 G4double targ_mass = G4NucleiProperties::Ge << 65 G4double targ_mass =
106 << 66 G4ParticleTable::GetParticleTable()->GetIonTable()->GetIonMass(Zt, At);
107 G4double proj_mass = aParticle->GetMass(); 67 G4double proj_mass = aParticle->GetMass();
108 G4double proj_momentum = aParticle->GetMome 68 G4double proj_momentum = aParticle->GetMomentum().mag();
109 69
110 G4double Ecm = calEcmValue (proj_mass, targ 70 G4double Ecm = calEcmValue (proj_mass, targ_mass, proj_momentum);
111 71
112 G4double B = 1.44 * Zt * Zp / r - b * Rt * 72 G4double B = 1.44 * Zt * Zp / r - b * Rt * Rp / ( Rt + Rp );
113 if(Ecm <= B) { return xsection; } << 73 if(Ecm <= B) return xsection;
>> 74 //G4double ke_per_N = aParticle->GetKineticEnergy() / Ap;
114 75
115 G4double c = calCeValue ( ke_per_N / MeV ) 76 G4double c = calCeValue ( ke_per_N / MeV );
116 77
117 G4double R1 = r0 * (cubicrAt + cubicrAp + 1 78 G4double R1 = r0 * (cubicrAt + cubicrAp + 1.85*cubicrAt*cubicrAp/(cubicrAt + cubicrAp) - c);
118 79
119 G4double R2 = 1.0 * ( At - 2 * Zt ) * Zp / 80 G4double R2 = 1.0 * ( At - 2 * Zt ) * Zp / ( Ap * At );
120 81
121 82
122 G4double R3 = (0.176 / g4pow->A13(Ecm)) * c << 83 G4double R3 = 0.176 / std::pow(G4double(Ecm), G4double(one_third)) * cubicrAt * cubicrAp /(cubicrAt + cubicrAp);
123 84
124 G4double R = R1 + R2 + R3; 85 G4double R = R1 + R2 + R3;
125 86
126 xsection = 10 * pi * R * R * ( 1 - B / Ecm 87 xsection = 10 * pi * R * R * ( 1 - B / Ecm );
127 xsection = xsection * millibarn; // mulit 88 xsection = xsection * millibarn; // mulitply xsection by millibarn
128 89
129 return xsection; 90 return xsection;
130 } 91 }
131 92
>> 93
>> 94 G4double G4IonsShenCrossSection::
>> 95 GetCrossSection(const G4DynamicParticle* aParticle, const G4Element* anElement,
>> 96 G4double temperature)
>> 97 {
>> 98 G4int nIso = anElement->GetNumberOfIsotopes();
>> 99 G4double xsection = 0;
>> 100
>> 101 if (nIso) {
>> 102 G4double sig;
>> 103 G4IsotopeVector* isoVector = anElement->GetIsotopeVector();
>> 104 G4double* abundVector = anElement->GetRelativeAbundanceVector();
>> 105 G4int ZZ;
>> 106 G4int AA;
>> 107
>> 108 for (G4int i = 0; i < nIso; i++) {
>> 109 ZZ = (*isoVector)[i]->GetZ();
>> 110 AA = (*isoVector)[i]->GetN();
>> 111 sig = GetZandACrossSection(aParticle, ZZ, AA, temperature);
>> 112 xsection += sig*abundVector[i];
>> 113 }
>> 114
>> 115 } else {
>> 116 G4int ZZ = G4lrint(anElement->GetZ());
>> 117 G4int AA = G4lrint(anElement->GetN());
>> 118 xsection = GetZandACrossSection(aParticle, ZZ, AA, temperature);
>> 119 }
>> 120
>> 121 return xsection;
>> 122 }
>> 123
>> 124
132 G4double 125 G4double
133 G4IonsShenCrossSection::calEcmValue(const G4do 126 G4IonsShenCrossSection::calEcmValue(const G4double mp, const G4double mt,
134 const G4do 127 const G4double Plab)
135 { 128 {
136 G4double Elab = std::sqrt ( mp * mp + Plab 129 G4double Elab = std::sqrt ( mp * mp + Plab * Plab );
137 G4double Ecm = std::sqrt ( mp * mp + mt * m 130 G4double Ecm = std::sqrt ( mp * mp + mt * mt + 2 * Elab * mt );
138 G4double Pcm = Plab * mt / Ecm; 131 G4double Pcm = Plab * mt / Ecm;
139 G4double KEcm = std::sqrt ( Pcm * Pcm + mp 132 G4double KEcm = std::sqrt ( Pcm * Pcm + mp * mp ) - mp;
140 return KEcm; 133 return KEcm;
141 } 134 }
142 135
143 136
144 G4double G4IonsShenCrossSection::calCeValue(co 137 G4double G4IonsShenCrossSection::calCeValue(const G4double ke)
145 { 138 {
146 // Calculate c value 139 // Calculate c value
147 // This value is indepenent from projectile 140 // This value is indepenent from projectile and target particle
148 // ke is projectile kinetic energy per nucle 141 // ke is projectile kinetic energy per nucleon in the Lab system
149 // with MeV unit 142 // with MeV unit
150 // fitting function is made by T. Koi 143 // fitting function is made by T. Koi
151 // There are no data below 30 MeV/n in Kox e 144 // There are no data below 30 MeV/n in Kox et al.,
152 145
153 G4double Ce; 146 G4double Ce;
154 G4double log10_ke = std::log10 ( ke ); 147 G4double log10_ke = std::log10 ( ke );
155 if (log10_ke > 1.5) 148 if (log10_ke > 1.5)
156 { 149 {
157 Ce = -10.0/std::pow(G4double(log10_ke), G 150 Ce = -10.0/std::pow(G4double(log10_ke), G4double(5)) + 2.0;
158 } 151 }
159 else 152 else
160 { 153 {
161 Ce = (-10.0/std::pow(G4double(1.5), G4dou 154 Ce = (-10.0/std::pow(G4double(1.5), G4double(5) ) + 2.0) /
162 std::pow(G4double(1.5) , G4double(3)) 155 std::pow(G4double(1.5) , G4double(3)) * std::pow(G4double(log10_ke), G4double(3));
163 } 156 }
164 return Ce; 157 return Ce;
165 } 158 }
166 <<
167 159