| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. *
17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. *
24 // ******************************************* 24 // ********************************************************************
25 // 25 //
>> 26 // $Id: G4eeToPGammaModel.cc,v 1.2 2009/02/20 16:38:33 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-03 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class header file 31 // GEANT4 Class header file
30 // 32 //
31 // 33 //
32 // File name: G4eeToPGammaModel 34 // File name: G4eeToPGammaModel
33 // 35 //
34 // Author: Vladimir Ivanchenko 36 // Author: Vladimir Ivanchenko
35 // 37 //
36 // Creation date: 25.10.2003 38 // Creation date: 25.10.2003
37 // 39 //
38 // Modifications: 40 // Modifications:
39 // 41 //
40 // 42 //
41 // ------------------------------------------- 43 // -------------------------------------------------------------------
42 // 44 //
43 45
44 46
45 //....oooOO0OOooo........oooOO0OOooo........oo 47 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46 //....oooOO0OOooo........oooOO0OOooo........oo 48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47 49
48 #include "G4eeToPGammaModel.hh" 50 #include "G4eeToPGammaModel.hh"
49 #include "Randomize.hh" 51 #include "Randomize.hh"
50 #include "G4PhysicalConstants.hh" <<
51 #include "G4SystemOfUnits.hh" <<
52 #include "G4PionZero.hh" 52 #include "G4PionZero.hh"
53 #include "G4Eta.hh" 53 #include "G4Eta.hh"
54 #include "G4Gamma.hh" 54 #include "G4Gamma.hh"
55 #include "G4DynamicParticle.hh" 55 #include "G4DynamicParticle.hh"
56 #include "G4PhysicsVector.hh" 56 #include "G4PhysicsVector.hh"
57 #include "G4PhysicsLinearVector.hh" 57 #include "G4PhysicsLinearVector.hh"
58 #include "G4eeCrossSections.hh" 58 #include "G4eeCrossSections.hh"
59 59
60 //....oooOO0OOooo........oooOO0OOooo........oo 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
61 61
62 using namespace std; 62 using namespace std;
63 63
64 G4eeToPGammaModel::G4eeToPGammaModel(G4eeCross << 64 G4eeToPGammaModel::G4eeToPGammaModel(G4eeCrossSections* cr, const G4String& npart):
65 const G4String& npart, << 65 cross(cr)
66 G4double maxkinEnergy, <<
67 G4double binWidth) <<
68 : G4Vee2hadrons(cr, <<
69 npart=="pi0" ? 782.62*MeV:1019.46*MeV, <<
70 maxkinEnergy, <<
71 binWidth) <<
72 { 66 {
73 G4cout << "####G4eeToPGammaModel & particle: <<
74 << "####" << G4endl; <<
75 <<
76 pi0 = G4PionZero::PionZero(); 67 pi0 = G4PionZero::PionZero();
77 if(npart == "pi0") { 68 if(npart == "pi0") {
78 massR = 782.62*MeV; 69 massR = 782.62*MeV;
79 particle = pi0; 70 particle = pi0;
80 } else { 71 } else {
81 massR = 1019.46*MeV; 72 massR = 1019.46*MeV;
82 particle = G4Eta::Eta(); 73 particle = G4Eta::Eta();
83 } 74 }
84 massP = particle->GetPDGMass(); 75 massP = particle->GetPDGMass();
85 } 76 }
86 77
87 //....oooOO0OOooo........oooOO0OOooo........oo 78 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
88 79
89 G4eeToPGammaModel::~G4eeToPGammaModel() 80 G4eeToPGammaModel::~G4eeToPGammaModel()
90 {} 81 {}
91 82
92 //....oooOO0OOooo........oooOO0OOooo........oo 83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
93 84
>> 85 G4double G4eeToPGammaModel::ThresholdEnergy() const
>> 86 {
>> 87 return LowEnergy();
>> 88 }
>> 89
>> 90 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 91
94 G4double G4eeToPGammaModel::PeakEnergy() const 92 G4double G4eeToPGammaModel::PeakEnergy() const
95 { 93 {
96 return massR; 94 return massR;
97 } 95 }
98 96
99 //....oooOO0OOooo........oooOO0OOooo........oo 97 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
100 98
101 G4double G4eeToPGammaModel::ComputeCrossSectio 99 G4double G4eeToPGammaModel::ComputeCrossSection(G4double e) const
102 { 100 {
>> 101 G4double ee = std::min(HighEnergy(),e);
103 G4double xs; 102 G4double xs;
104 if(particle == pi0) xs = cross->CrossSection << 103 if(particle == pi0) xs = cross->CrossSectionPi0G(ee);
105 else xs = cross->CrossSection << 104 else xs = cross->CrossSectionEtaG(ee);
106 return xs; 105 return xs;
107 } 106 }
108 107
109 //....oooOO0OOooo........oooOO0OOooo........oo 108 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
110 109
>> 110 G4PhysicsVector* G4eeToPGammaModel::PhysicsVector(G4double emin,
>> 111 G4double emax) const
>> 112 {
>> 113 G4double tmin = std::max(emin, ThresholdEnergy());
>> 114 G4double tmax = std::max(tmin, emax);
>> 115 G4int nbins = (G4int)((tmax - tmin)/(5.*MeV));
>> 116 G4PhysicsVector* v = new G4PhysicsLinearVector(emin,emax,nbins);
>> 117 v->SetSpline(true);
>> 118 return v;
>> 119 }
>> 120
>> 121 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 122
111 void G4eeToPGammaModel::SampleSecondaries(std: 123 void G4eeToPGammaModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
112 G4double e, const G4ThreeVector& directi 124 G4double e, const G4ThreeVector& direction)
113 { 125 {
114 G4double egam = 0.5*e*(1.0 - massP*massP/(ma 126 G4double egam = 0.5*e*(1.0 - massP*massP/(massR*massR));
115 G4double tkin = e - egam - massP; 127 G4double tkin = e - egam - massP;
116 if(tkin < 0.0) tkin = 0.0; 128 if(tkin < 0.0) tkin = 0.0;
117 G4double cost; 129 G4double cost;
118 do { 130 do {
119 cost = 2.0*G4UniformRand() - 1.0; 131 cost = 2.0*G4UniformRand() - 1.0;
120 // Loop checking, 07-Aug-2015, Vladimir Iv <<
121 } while( 2.0*G4UniformRand() > 1.0 + cost*co 132 } while( 2.0*G4UniformRand() > 1.0 + cost*cost );
122 133
123 G4double sint = sqrt(1.0 - cost*cost); 134 G4double sint = sqrt(1.0 - cost*cost);
124 G4double phi = twopi * G4UniformRand(); 135 G4double phi = twopi * G4UniformRand();
125 136
126 G4ThreeVector dir(sint*cos(phi),sint*sin(phi 137 G4ThreeVector dir(sint*cos(phi),sint*sin(phi), cost);
127 dir.rotateUz(direction); 138 dir.rotateUz(direction);
128 139
129 // create G4DynamicParticle objects 140 // create G4DynamicParticle objects
130 G4DynamicParticle* p1 = 141 G4DynamicParticle* p1 =
131 new G4DynamicParticle(particle,dir,tkin); 142 new G4DynamicParticle(particle,dir,tkin);
132 G4DynamicParticle* p2 = 143 G4DynamicParticle* p2 =
133 new G4DynamicParticle(G4Gamma::Gamma(),-d 144 new G4DynamicParticle(G4Gamma::Gamma(),-dir,egam);
134 newp->push_back(p1); 145 newp->push_back(p1);
135 newp->push_back(p2); 146 newp->push_back(p2);
136 } 147 }
137 148
138 //....oooOO0OOooo........oooOO0OOooo........oo 149 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
139 150
140 151