Geant4  10.02.p01
G4XpipNTotal.cc
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26 #include <cmath>
27 #include "G4Exp.hh"
28 #include "G4Log.hh"
29 #include "G4XpipNTotal.hh"
30 #include "G4SystemOfUnits.hh"
31 
34  {
35  std::pair<double,double> it;
36  it.first=1105.46; it.second= 6.4; theLowEData.push_back(it);
37  it.first=1133.28; it.second= 18.0; theLowEData.push_back(it);
38  it.first=1165.12; it.second= 66.0; theLowEData.push_back(it);
39  it.first=1198.8; it.second= 160.; theLowEData.push_back(it);
40  it.first=1212.51; it.second= 199.; theLowEData.push_back(it);
41  it.first=1233.18; it.second= 195.; theLowEData.push_back(it);
42  it.first=1301.86; it.second= 73.8; theLowEData.push_back(it);
43  it.first=1368.93; it.second= 35.0; theLowEData.push_back(it);
44  it.first=1433.81; it.second= 22.0; theLowEData.push_back(it);
45  it.first=1496.42; it.second= 15.0; theLowEData.push_back(it);
46  it.first=1556.84; it.second= 15.2; theLowEData.push_back(it);
47  it.first=1615.21; it.second= 19.4; theLowEData.push_back(it);
48  it.first=1671.7; it.second= 25.; theLowEData.push_back(it);
49  it.first=1726.44; it.second= 26.; theLowEData.push_back(it);
50  it.first=1779.57; it.second= 30.; theLowEData.push_back(it);
51  it.first=1881.49; it.second= 40.; theLowEData.push_back(it);
52  it.first=1930.49; it.second= 40.; theLowEData.push_back(it);
53  it.first=2070.69; it.second= 30.; theLowEData.push_back(it);
54  it.first=2202.11; it.second= 29.; theLowEData.push_back(it);
55  it.first=2326.19; it.second= 30.7; theLowEData.push_back(it);
56  it.first=2405.38; it.second= 30.7; theLowEData.push_back(it);
57  it.first=2733.67; it.second= 28.3; theLowEData.push_back(it);
58  it.first=3207.21; it.second= 26.5; theLowEData.push_back(it);
59  it.first=4434.76; it.second= 25.0; theLowEData.push_back(it);
60  }
61 
63  CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
64  {
65  G4double sqrts = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
66  if(sqrts > theLowEData.back().first/MeV) return thePDGData.CrossSection(trk1, trk2);
67  G4double result = 0;
68  size_t i(0), it(0);
69  if(sqrts<theLowEData[0].first) return 0;
70  for(i=0; i<theLowEData.size(); i++)
71  {
72  if(theLowEData[i].first/MeV>sqrts) break;
73  it = i;
74  }
75  G4double x1 = G4Log(theLowEData[it].first);
76  G4double x2 = G4Log(theLowEData[it+1].first);
77  G4double y1 = G4Log(theLowEData[it].second);
78  G4double y2 = G4Log(theLowEData[it+1].second);
79  G4double x = G4Log(sqrts);
80  G4double y = y1+(x-x1)*(y2-y1)/(x2-x1);
81  result = G4Exp(y);
82  return result*millibarn;
83  }
static const double MeV
Definition: G4SIunits.hh:211
std::vector< std::pair< double, double > > theLowEData
Definition: G4XpipNTotal.hh:45
static const double second
Definition: G4SIunits.hh:156
G4double G4Log(G4double x)
Definition: G4Log.hh:230
G4double G4Exp(G4double initial_x)
Exponential Function double precision.
Definition: G4Exp.hh:183
G4XPDGTotal thePDGData
Definition: G4XpipNTotal.hh:44
const G4double x[NPOINTSGL]
virtual G4double CrossSection(const G4KineticTrack &trk1, const G4KineticTrack &trk2) const
Definition: G4XpipNTotal.cc:63
static const double millibarn
Definition: G4SIunits.hh:105
double G4double
Definition: G4Types.hh:76
const G4LorentzVector & Get4Momentum() const
virtual G4double CrossSection(const G4KineticTrack &trk1, const G4KineticTrack &trk2) const
Definition: G4XPDGTotal.cc:158