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25 // 25 //
>> 26 // $Id: G4eeToPGammaModel.cc,v 1.1 2008/07/10 18:07:27 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-02-patch-01 $
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
94 G4double G4eeToPGammaModel::PeakEnergy() const << 85 G4PhysicsVector* G4eeToPGammaModel::PhysicsVector(G4double emin,
95 { << 86 G4double emax) const
96 return massR; <<
97 } <<
98 <<
99 //....oooOO0OOooo........oooOO0OOooo........oo <<
100 <<
101 G4double G4eeToPGammaModel::ComputeCrossSectio <<
102 { 87 {
103 G4double xs; << 88 G4double tmin = std::max(emin, ThresholdEnergy());
104 if(particle == pi0) xs = cross->CrossSection << 89 G4double tmax = std::max(tmin, emax);
105 else xs = cross->CrossSection << 90 G4int nbins = (G4int)((tmax - tmin)/(5.*MeV));
106 return xs; << 91 G4PhysicsVector* v = new G4PhysicsLinearVector(emin,emax,nbins);
>> 92 v->SetSpline(true);
>> 93 return v;
107 } 94 }
108 95
109 //....oooOO0OOooo........oooOO0OOooo........oo 96 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
110 97
111 void G4eeToPGammaModel::SampleSecondaries(std: 98 void G4eeToPGammaModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
112 G4double e, const G4ThreeVector& directi 99 G4double e, const G4ThreeVector& direction)
113 { 100 {
114 G4double egam = 0.5*e*(1.0 - massP*massP/(ma 101 G4double egam = 0.5*e*(1.0 - massP*massP/(massR*massR));
115 G4double tkin = e - egam - massP; 102 G4double tkin = e - egam - massP;
116 if(tkin < 0.0) tkin = 0.0; 103 if(tkin < 0.0) tkin = 0.0;
117 G4double cost; 104 G4double cost;
118 do { 105 do {
119 cost = 2.0*G4UniformRand() - 1.0; 106 cost = 2.0*G4UniformRand() - 1.0;
120 // Loop checking, 07-Aug-2015, Vladimir Iv <<
121 } while( 2.0*G4UniformRand() > 1.0 + cost*co 107 } while( 2.0*G4UniformRand() > 1.0 + cost*cost );
122 108
123 G4double sint = sqrt(1.0 - cost*cost); 109 G4double sint = sqrt(1.0 - cost*cost);
124 G4double phi = twopi * G4UniformRand(); 110 G4double phi = twopi * G4UniformRand();
125 111
126 G4ThreeVector dir(sint*cos(phi),sint*sin(phi 112 G4ThreeVector dir(sint*cos(phi),sint*sin(phi), cost);
127 dir.rotateUz(direction); 113 dir.rotateUz(direction);
128 114
129 // create G4DynamicParticle objects 115 // create G4DynamicParticle objects
130 G4DynamicParticle* p1 = 116 G4DynamicParticle* p1 =
131 new G4DynamicParticle(particle,dir,tkin); 117 new G4DynamicParticle(particle,dir,tkin);
132 G4DynamicParticle* p2 = 118 G4DynamicParticle* p2 =
133 new G4DynamicParticle(G4Gamma::Gamma(),-d 119 new G4DynamicParticle(G4Gamma::Gamma(),-dir,egam);
134 newp->push_back(p1); 120 newp->push_back(p1);
135 newp->push_back(p2); 121 newp->push_back(p2);
136 } 122 }
137 123
138 //....oooOO0OOooo........oooOO0OOooo........oo 124 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
139 125
140 126