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G4PiMinusStopTa.cc
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24 // ********************************************************************
25 //
26 // File name: G4PiMinusStopTa
27 //
28 // Author: Maria Grazia Pia (pia@genova.infn.it)
29 //
30 // Creation date: 8 May 1998
31 //
32 // -------------------------------------------------------------------
33 
34 #include "G4ios.hh"
35 
36 #include "G4PiMinusStopTa.hh"
37 
38 #include <vector>
39 
40 #include "globals.hh"
41 #include "Randomize.hh"
42 #include "G4Proton.hh"
43 #include "G4Neutron.hh"
44 #include "G4ParticleTypes.hh"
45 #include "G4ReactionKinematics.hh"
47 #include "G4LorentzVector.hh"
48 #include "G4PiMinusStopMaterial.hh"
50 
51 // np/pp production ratio
52 // Experimental values:
53 // R(np/pp) = 6.3 +- 1.4 (R. Madey et al., Phys Rev C25 (1982) 3050
54 G4double G4PiMinusStopTa::npRatio = 17.;
55 
56 // Average numbers of final nucleons detected, for N-pair absorption
57 // (R. Madey et al., Phys Rev C25 (1982) 3050
58 G4double G4PiMinusStopTa::nFinalNucleons = 1.8;
59 
60 // Kinetic energy (MeV) distributions measured for coincident nucleon
61 // emission
62 // (R. Madey et al., Phys Rev C25 (1982) 3050
63 
64 G4int G4PiMinusStopTa::eKinEntries = 10;
65 
66 G4double G4PiMinusStopTa::eKinData[10] = { 0.24, 0.59, 1.13, 1.38,
67  1.50,
68  1.38, 1.13, 0.83, 0.49, 0.22};
69 
70 G4double G4PiMinusStopTa::eKin[11] = { 5.2, 12., 25., 41.5,
71  49.6,
72  57.7, 79.3, 94.4, 104., 120., 140.};
73 
74 
75 // Opening angle distributions measured for coincident nucleon emission
76 // (P.Heusi et al., Nucl. Phys. A407 (1983) 429
77 
78 G4int G4PiMinusStopTa::angleEntries = 7;
79 
80 G4double G4PiMinusStopTa::angleData[7] =
81 { 1.43, 1.67, 2.62, 4.29, 7.62, 11.90, 14.76 };
82 
83 G4double G4PiMinusStopTa::angle[8] = { 1.308997, 1.570796, 1.832596, 2.094395,
84  2.356194, 2.617994, 2.967060, 3.1415927 };
85 
86 
87 
88 // Constructor
89 
91 {
92  // Cluster size: nucleon pair, alpha, triton etc.
93  // First implementation: interaction with nucleon pair only
94  _clusterSize = 2;
95 
96  // R ratio
97  theR = 1. / (1. + npRatio);
98 
99  _definitions = new std::vector<G4ParticleDefinition*>();
100  _momenta = new std::vector<G4LorentzVector*>();
101 
102  std::vector<double> eKinVector;
103  std::vector<double> eKinDataVector;
104  int i;
105  for (i=0; i<eKinEntries; i++)
106  {
107  eKinVector.push_back(eKin[i]);
108  eKinDataVector.push_back(eKinData[i]);
109  }
110  eKinVector.push_back(eKin[eKinEntries]);
111  _distributionE = new G4DistributionGenerator(eKinVector,eKinDataVector);
112 
113  std::vector<double> angleVector;
114  std::vector<double> angleDataVector;
115  for (i=0; i<angleEntries; i++)
116  {
117  angleVector.push_back(angle[i]);
118  angleDataVector.push_back(angleData[i]);
119  }
120  angleVector.push_back(angle[angleEntries]);
121  _distributionAngle = new G4DistributionGenerator(angleVector,angleDataVector);
122 }
123 
124 
125 // Destructor
126 
128 {}
129 
131 {
132  return nFinalNucleons;
133 }
134