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25 //
26 //
27
28 #include <iostream>
29
30 #include "G4SystemOfUnits.hh"
31 #include "G4PhysicalConstants.hh"
32 #include "G4HadTmpUtil.hh"
33 #include "G4ElNucleusSFcs.hh"
34 #include "G4ElectroNuclearCrossSection.hh"
35
36 // factory
37 #include "G4CrossSectionFactory.hh"
38 //
39 G4_DECLARE_XS_FACTORY(G4ElNucleusSFcs);
40
41
42 G4ElNucleusSFcs::G4ElNucleusSFcs():G4VCrossSectionDataSet(Default_Name())
43 {
44 fCHIPScs = new G4ElectroNuclearCrossSection();
45 }
46
47 G4ElNucleusSFcs::~G4ElNucleusSFcs()
48 {
49 if( fCHIPScs != nullptr ) delete fCHIPScs;
50 }
51
52 void
53 G4ElNucleusSFcs::CrossSectionDescription( std::ostream& outFile) const
54 {
55 outFile << "G4ElNucleusSFcs provides the inelastic\n"
56 << "cross section for e- and e+ interactions with nuclei according to the structure function approach."
57 << "all energies.\n";
58 }
59
60 G4bool G4ElNucleusSFcs::IsElementApplicable( const G4DynamicParticle* aPart, G4int Z, const G4Material*)
61 {
62
63 G4double eKin = aPart->GetKineticEnergy();
64 G4double thTkin = ThresholdEnergy();
65
66 return ( Z > 0 && Z < 120 && eKin > thTkin );
67 }
68
69
70 G4double G4ElNucleusSFcs::GetIsoCrossSection( const G4DynamicParticle* aPart, G4int ZZ, G4int AA, const G4Isotope* ,
71 const G4Element* , const G4Material* )
72 {
73 G4double xsc(0.), ratio(1.);
74
75 xsc = fCHIPScs->GetElementCrossSection( aPart, ZZ, nullptr ); //, const G4Material*);
76
77 ratio = GetRatio(ZZ,AA);
78
79 if( ratio > 0. ) xsc /= ratio;
80
81 return xsc;
82 }
83
84 /////////////////////////////////////////////////////////////////////////
85 //
86 // Calculate ratio CHIPS-CS/SF-CS, averaged between 200 MeV and 100 GeV
87
88 G4double G4ElNucleusSFcs::GetRatio( G4int Z, G4int A )
89 {
90 G4double ratio(1.);
91
92 if ( Z == 1 && A == 1 ) return 1.51;
93 else if ( Z == 1 && A == 2 ) return 0.33;
94 else if ( Z == 1 && A == 3 ) return 0.27;
95 else if ( Z == 2 && A == 4 ) return 1.81;
96 else if ( Z == 6 && A == 12 ) return 2.26;
97 else if ( Z == 7 && A == 14 ) return 2.47;
98 else if ( Z == 8 && A == 16 ) return 2.61;
99 else if ( Z == 13 && A == 27 ) return 2.57;
100 else if ( Z == 14 && A == 28 ) return 2.49;
101 else if ( Z == 18 && A == 40 ) return 2.72;
102 else if ( Z == 22 && A == 48 ) return 2.71;
103 else if ( Z == 26 && A == 56 ) return 2.79;
104 else if ( Z == 29 && A == 64 ) return 2.78;
105 else if ( Z == 32 && A == 73 ) return 2.87;
106 else if ( Z == 42 && A == 96 ) return 3.02;
107 else if ( Z == 46 && A == 106 ) return 3.02;
108 else if ( Z == 47 && A == 108 ) return 2.99;
109 else if ( Z == 48 && A == 112 ) return 3.00;
110 else if ( Z == 74 && A == 184 ) return 3.44;
111 else if ( Z == 79 && A == 200 ) return 3.49;
112 else if ( Z == 82 && A == 207 ) return 3.48;
113 else if ( Z == 92 && A == 238 ) return 3.88;
114 else
115 {
116 G4int it(0), iMax(19);
117 G4double zz = G4double(Z);
118
119 for ( it = 0; it < iMax; ++it ) if ( zz <= fZZ[it] ) break;
120
121 if ( it == 0 ) return fRR[0];
122 else if( it == iMax ) return fRR[iMax-1];
123 else
124 {
125 G4double x1 = fZZ[it-1];
126 G4double x2 = fZZ[it];
127 G4double y1 = fRR[it-1];
128 G4double y2 = fRR[it];
129
130 if( x1 >= x2 ) return fRR[it];
131 else
132 {
133 G4double angle = (y2-y1)/(x2-x1);
134 ratio = y1 + ( zz - x1 )*angle;
135 }
136 }
137 }
138 return ratio;
139 }
140
141 /////////////////////////////////////////
142
143 G4double G4ElNucleusSFcs::ThresholdEnergy()
144 {
145 G4double thTkin = 134.9766*CLHEP::MeV; // Pi0 threshold for the nucleon
146
147 thTkin *= 1.3; // nucleon motion
148
149 return thTkin;
150 }
151
152 /////////////////////////////////////////
153
154 const G4double G4ElNucleusSFcs::fZZ[19] =
155 {
156 2., 6., 7., 8., 13., 14., 18., 22., 26., 29.,
157 32., 42., 46., 47., 48., 74., 79., 82., 92.
158 };
159
160 /////////////////////////////////////////
161
162 const G4double G4ElNucleusSFcs::fRR[19] =
163 {
164 1.81, 2.26, 2.47, 2.61, 2.57, 2.49, 2.72, 2.71, 2.79, 2.78,
165 2.87, 3.02, 3.02, 2.99, 3., 3.44, 3.49, 3.48, 2.88
166 };
167