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