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G4XnpTotalLowE.cc
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27 // -------------------------------------------------------------------
28 // GEANT4 Class file
29 //
30 // For information related to this code contact:
31 //
32 // File name: G4XnpTotalLowE
33 //
34 // Author:
35 //
36 // Creation date: 15 April 1999
37 //
38 // Modifications:
39 //
40 // Neutron-Proton total cross section
41 // Linear interpolation from data table
42 //
43 // -------------------------------------------------------------------
44 
45 #include "globals.hh"
46 #include "G4ios.hh"
47 #include "G4Exp.hh"
48 #include "G4Log.hh"
49 #include "G4SystemOfUnits.hh"
50 #include "G4XnpTotalLowE.hh"
51 #include "G4KineticTrack.hh"
52 #include "G4ParticleDefinition.hh"
53 #include "G4PhysicsVector.hh"
54 #include "G4PhysicsLnVector.hh"
55 #include "G4Proton.hh"
56 #include "G4Neutron.hh"
57 
58 const G4double G4XnpTotalLowE::_lowLimit = 0.;
59 const G4double G4XnpTotalLowE::_highLimit = 3.*GeV;
60 
61 // Low energy limit of the cross-section table (in GeV)
62 // Units are assigned when filling the PhysicsVector
63 const G4double G4XnpTotalLowE::_eMinTable = 1.8964808;
64 const G4double G4XnpTotalLowE::_eStepLog = 0.01;
65 
66 // Cross-sections in mb
67 // Units are assigned when filling the PhysicsVector
68 const G4int G4XnpTotalLowE::_tableSize = 101;
69 const G4double G4XnpTotalLowE::_sigmaTable[101] =
70 {
71  1500.0,
72  248.20, 93.38, 55.26, 44.50, 41.33, 38.48, 37.20, 35.98,
73  35.02, 34.47, 34.37, 34.67, 35.23, 35.97, 36.75, 37.37,
74  37.77, 38.03, 38.40, 38.83, 39.26, 39.67, 40.06, 40.45,
75  40.79, 41.06, 41.31, 41.52, 41.70, 41.81, 41.87, 41.98,
76  42.12, 42.29, 42.55, 42.82, 43.01, 43.12, 43.16, 43.14,
77  43.06, 42.95, 42.81, 42.67, 42.54, 42.45, 42.38, 42.33,
78  42.30, 42.29, 42.28, 42.26, 42.24, 42.21, 42.17, 42.14,
79  42.10, 42.07, 42.06, 42.05, 42.04, 42.03, 42.02, 42.00,
80  41.97, 41.94, 41.89, 41.84, 41.79, 41.73, 41.67, 41.61,
81  41.55, 41.49, 41.44, 41.38, 41.34, 41.31, 41.29, 41.28,
82  41.27, 41.28, 41.30, 41.33, 41.36, 41.40, 41.44, 41.49,
83  41.50, 41.51, 41.51, 41.51, 41.52, 41.51, 41.51, 41.50,
84  41.50, 41.49, 41.47, 41.46
85 };
86 
87 
89 {
90  // Cross-sections are available in the range (_eMin,_eMax)
91 
92  _eMin = _eMinTable * GeV;
93  _eMin = G4Exp(G4Log(_eMinTable)-_eStepLog)*GeV;
94  _eMax = G4Exp(G4Log(_eMinTable) + _tableSize * _eStepLog) * GeV;
95 
96  // Protections: validity limits must be compatible with available data
97 // @@GF this ought to be _lowLimit < _eMin
98  if (_eMin < _lowLimit)
99  throw G4HadronicException(__FILE__, __LINE__, "G4XnpTotalLowE::G4XnpTotalLowE - Low energy limit not valid");
100 
101  if (_highLimit > _eMax)
102  throw G4HadronicException(__FILE__, __LINE__, "G4XnpTotalLowE::G4XnpTotalLowE - High energy limit not valid");
103 
104  _sigma = new G4PhysicsLnVector(_eMin,_eMax,_tableSize);
105  G4int i;
106  for (i=0; i<_tableSize; i++)
107  {
108  G4double value = _sigmaTable[i] * millibarn;
109  _sigma->PutValue(i,value);
110  }
111 }
112 
113 
115 {
116  if (_sigma) delete _sigma;
117  _sigma=0;
118 }
119 
120 
122 {
123  return (this == (G4XnpTotalLowE *) &right);
124 }
125 
126 
128 {
129  return (this != (G4XnpTotalLowE *) &right);
130 }
131 
132 
134 {
135  G4double sigma = 0.;
136  G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
137  G4bool dummy = false;
138 
141 
142  const G4ParticleDefinition* def1 = trk1.GetDefinition();
143  const G4ParticleDefinition* def2 = trk2.GetDefinition();
144  if ( (def1 == proton && def2 == neutron) ||
145  (def1 == neutron && def2 == proton) )
146  {
147  if (sqrtS >= _eMin && sqrtS <= _eMax)
148  {
149  sigma = _sigma->GetValue(sqrtS,dummy);
150  } else if ( sqrtS < _eMin )
151  {
152  sigma = _sigma->GetValue(_eMin,dummy);
153  }
154  }
155 
156  return sigma;
157 }
158 
160 {
161  // Dump the cross-section table
162 
163  G4cout << Name() << "Cross-section table: " << G4endl;
164  G4bool dummy = false;
165  G4int i;
166 
167  for (i=0; i<_tableSize; i++)
168  {
169  G4double e = _sigma->GetLowEdgeEnergy(i) / GeV;
170  G4double sigma = _sigma->GetValue(e,dummy) / millibarn;
171  G4cout << i << ") e = " << e << " GeV ---- Cross section = " << sigma << " mb " << G4endl;
172  }
173 
175 }
176 
177 
179 {
180  G4String name("NNTotalLowE");
181  return name;
182 }
183 
184 
186 {
187  G4bool answer = InLimits(e,_lowLimit,_highLimit);
188 
189  return answer;
190 }
191 
192 
const XML_Char * name
Definition: expat.h:151
virtual G4String Name() const
G4double GetValue(G4double theEnergy, G4bool &isOutRange) const
static G4Proton * ProtonDefinition()
Definition: G4Proton.cc:88
G4bool operator==(const G4XnpTotalLowE &right) const
G4double GetLowEdgeEnergy(size_t binNumber) const
int G4int
Definition: G4Types.hh:78
G4GLOB_DLL std::ostream G4cout
const XML_Char int const XML_Char * value
Definition: expat.h:331
bool G4bool
Definition: G4Types.hh:79
void PutValue(size_t index, G4double theValue)
G4double G4Log(G4double x)
Definition: G4Log.hh:230
G4double G4Exp(G4double initial_x)
Exponential Function double precision.
Definition: G4Exp.hh:183
virtual G4bool IsValid(G4double e) const
virtual void Print() const
static constexpr double GeV
Definition: G4SIunits.hh:217
virtual ~G4XnpTotalLowE()
virtual G4double CrossSection(const G4KineticTrack &trk1, const G4KineticTrack &trk2) const
#define G4endl
Definition: G4ios.hh:61
G4bool operator!=(const G4XnpTotalLowE &right) const
double G4double
Definition: G4Types.hh:76
const G4LorentzVector & Get4Momentum() const
const G4ParticleDefinition * GetDefinition() const
static G4Neutron * NeutronDefinition()
Definition: G4Neutron.cc:99
G4PhysicsLogVector G4PhysicsLnVector
virtual void Print() const
static constexpr double millibarn
Definition: G4SIunits.hh:106
G4bool InLimits(G4double e, G4double eLow, G4double eHigh) const