| Geant4 Cross Reference |
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25 //
26 //
27 // --------------------------------------------------------------------
28 // by J.P Wellisch, Sun Sep 15 2002.
29
30 #include "G4PiData.hh"
31 #include "G4SystemOfUnits.hh"
32
33 ///////////////////////////////////////////////////////////////////////
34
35 G4PiData::G4PiData(const G4double * aT, const G4double * aIn,
36 const G4double * anE, G4int nP)
37 {
38 for(G4int i = 0; i < nP; ++i )
39 {
40 std::pair<G4double, G4double> x;
41 x.first=aT[i]*millibarn;
42 x.second=aIn[i]*millibarn;
43 std::pair<G4double, std::pair<G4double, G4double > > aP;
44 aP.first=anE[i]*GeV;
45 aP.second=x;
46 push_back(aP);
47 if (i == 0) {
48 fMinE = aP.first;
49 fTot0 = x.first;
50 fInel0 = x.second;
51 } else if (i+1 == nP) {
52 fMaxE = aP.first;
53 fTot1 = x.first;
54 fInel1 = x.second;
55 }
56 }
57 }
58
59 //////////////////////////////////////////////////////////////////////////
60
61 G4double G4PiData::ReactionXSection(G4double kineticEnergy)
62 {
63 if (kineticEnergy <= fMinE) { return fInel0; }
64 if (kineticEnergy >= fMaxE) { return fInel1; }
65
66 G4PiData::iterator it=begin();
67 while(it!=end()&&kineticEnergy>(*it).first) {++it;} /* Loop checking, 08.01.2016, W. Pokorski */
68 if(it==end())
69 {
70 G4ExceptionDescription ed;
71 ed << "This cross section is applied for E(MeV)= " << kineticEnergy
72 << " outside allowed energy interval" << G4endl;
73 G4Exception("G4PiData::ReactionXSection", "had001", FatalException, ed);
74 }
75 if(it==begin()) it++;
76 G4double x1,x2,e1,e2;
77 e1=(*(it-1)).first;
78 x1=(*(it-1)).second.second;
79 e2=(*(it)).first;
80 x2=(*(it)).second.second;
81 return std::max(0., x1 + (kineticEnergy-e1)*(x2-x1)/(e2-e1));
82 }
83
84 ////////////////////////////////////////////////////////////////////////////
85
86 G4double G4PiData::ElasticXSection(G4double kineticEnergy)
87 {
88 if (kineticEnergy <= fMinE) { return fTot0 - fInel0; }
89 if (kineticEnergy >= fMaxE) { return fTot1 - fInel1; }
90
91 G4PiData::iterator it=begin();
92 while(it!=end()&&kineticEnergy>(*it).first) {it++;} /* Loop checking, 08.01.2016, W. Pokorski */
93 if(it==end())
94 {
95 G4ExceptionDescription ed;
96 ed << "This cross section is applied for E(MeV)= " << kineticEnergy
97 << " outside allowed energy interval" << G4endl;
98 G4Exception("G4PiData::ElasticXSection", "had001", FatalException, ed);
99 }
100 if(it==begin()) it++;
101 G4double x1,x2,e1,e2;
102 e1=(*(it-1)).first;
103 x1=(*(it-1)).second.first - (*(it-1)).second.second;
104 e2=(*(it)).first;
105 x2=(*(it)).second.first - (*(it)).second.second;
106 return std::max(0., x1 + (kineticEnergy-e1)*(x2-x1)/(e2-e1));
107 }
108
109 ////////////////////////////////////////////////////////////////////////////
110
111 G4double G4PiData::TotalXSection(G4double kineticEnergy)
112 {
113 if (kineticEnergy <= fMinE) { return fTot0; }
114 if (kineticEnergy >= fMaxE) { return fTot1; }
115
116 G4PiData::iterator it=begin();
117 while(it!=end()&&kineticEnergy>(*it).first) {it++;} /* Loop checking, 08.01.2016, W. Pokorski */
118 if(it==end())
119 {
120 G4ExceptionDescription ed;
121 ed << "This cross section is applied for E(MeV)= " << kineticEnergy
122 << " outside allowed energy interval" << G4endl;
123 G4Exception("G4PiData::TotalXSection", "had001", FatalException, ed);
124 }
125 if(it==begin()) it++;
126 G4double x1,x2,e1,e2;
127 e1=(*(it-1)).first;
128 x1=(*(it-1)).second.first;
129 e2=(*(it)).first;
130 x2=(*(it)).second.first;
131 return std::max(0., x1 + (kineticEnergy-e1)*(x2-x1)/(e2-e1));
132 }
133