Geant4  10.01.p03
G4XpimNTotal.cc
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26 #include <cmath>
27 
28 #include "G4XpimNTotal.hh"
29 #include "G4SystemOfUnits.hh"
30 
33  {
34  std::pair<double,double> it;
35  it.first=1105.46 ;it.second= 8.8; theLowEData.push_back(it);
36  it.first=1139.41 ;it.second= 13.6; theLowEData.push_back(it);
37  it.first=1165.12 ;it.second= 26.0; theLowEData.push_back(it);
38  it.first=1198.8 ;it.second= 60.; theLowEData.push_back(it);
39  it.first=1212.51 ;it.second= 70.; theLowEData.push_back(it);
40  it.first=1222.84 ;it.second= 72.; theLowEData.push_back(it);
41  it.first=1233.18 ;it.second= 68.; theLowEData.push_back(it);
42  it.first=1240.08 ;it.second= 65.; theLowEData.push_back(it);
43  it.first=1301.86 ;it.second= 30.; theLowEData.push_back(it);
44  it.first=1335.65 ;it.second= 26.; theLowEData.push_back(it);
45  it.first=1368.93 ;it.second= 27.; theLowEData.push_back(it);
46  it.first=1433.81 ;it.second= 30.; theLowEData.push_back(it);
47  it.first=1496.42 ;it.second= 45.; theLowEData.push_back(it);
48  it.first=1508.67 ;it.second= 47.; theLowEData.push_back(it);
49  it.first=1520.84 ;it.second= 45.; theLowEData.push_back(it);
50  it.first=1568.67 ;it.second= 35.; theLowEData.push_back(it);
51  it.first=1603.69 ;it.second= 37.; theLowEData.push_back(it);
52  it.first=1660.54 ;it.second= 58.; theLowEData.push_back(it);
53  it.first=1674.47 ;it.second= 59.; theLowEData.push_back(it);
54  it.first=1688.29 ;it.second= 58.; theLowEData.push_back(it);
55  it.first=1779.57 ;it.second= 36.; theLowEData.push_back(it);
56  it.first=1881.49 ;it.second= 36.8; theLowEData.push_back(it);
57  it.first=1978.31 ;it.second= 34.5; theLowEData.push_back(it);
58  it.first=2038.82 ;it.second= 34.5; theLowEData.push_back(it);
59  it.first=2115.39 ;it.second= 36.; theLowEData.push_back(it);
60  it.first=2159.18 ;it.second= 36.3; theLowEData.push_back(it);
61  it.first=2244.22 ;it.second= 36.; theLowEData.push_back(it);
62  it.first=2424.78 ;it.second= 33.; theLowEData.push_back(it);
63  it.first=2664.2 ;it.second= 32.; theLowEData.push_back(it);
64  it.first=3487.43 ;it.second= 28.; theLowEData.push_back(it);
65  it.first=4434.76 ;it.second= 26.7; theLowEData.push_back(it);
66  }
67 
69  CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
70  {
71  G4double sqrts = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
72  if(sqrts > theLowEData.back().first/MeV) return thePDGData.CrossSection(trk1, trk2);
73  G4double result = 0;
74  size_t i(0), it(0);
75  if(sqrts<theLowEData[0].first) return 0;
76  for(i=0; i<theLowEData.size(); i++)
77  {
78  if(theLowEData[i].first/MeV>sqrts) break;
79  it = i;
80  }
81  G4double x1 = std::log(theLowEData[it].first);
82  G4double x2 = std::log(theLowEData[it+1].first);
83  G4double y1 = std::log(theLowEData[it].second);
84  G4double y2 = std::log(theLowEData[it+1].second);
85  G4double x = std::log(sqrts);
86  G4double y = y1+(x-x1)*(y2-y1)/(x2-x1);
87  result = std::exp(y);
88  return result*millibarn;
89  }
virtual G4double CrossSection(const G4KineticTrack &trk1, const G4KineticTrack &trk2) const
Definition: G4XpimNTotal.cc:69
static const double MeV
Definition: G4SIunits.hh:193
std::vector< std::pair< double, double > > theLowEData
Definition: G4XpimNTotal.hh:45
G4XPDGTotal thePDGData
Definition: G4XpimNTotal.hh:44
static const double second
Definition: G4SIunits.hh:138
static const double millibarn
Definition: G4SIunits.hh:96
double G4double
Definition: G4Types.hh:76
const G4LorentzVector & Get4Momentum() const
virtual G4double CrossSection(const G4KineticTrack &trk1, const G4KineticTrack &trk2) const
Definition: G4XPDGTotal.cc:157