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25 // 25 //
>> 26 // $Id: G4eeToTwoPiModel.cc,v 1.4 2006/06/29 19:32:50 gunter Exp $
>> 27 // GEANT4 tag $Name: geant4-08-01 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class header file 31 // GEANT4 Class header file
30 // 32 //
31 // 33 //
32 // File name: G4eeToTwoPiModel 34 // File name: G4eeToTwoPiModel
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 "G4eeToTwoPiModel.hh" 50 #include "G4eeToTwoPiModel.hh"
49 #include "Randomize.hh" 51 #include "Randomize.hh"
50 #include "G4PhysicalConstants.hh" <<
51 #include "G4SystemOfUnits.hh" <<
52 #include "G4PionPlus.hh" 52 #include "G4PionPlus.hh"
53 #include "G4PionMinus.hh" 53 #include "G4PionMinus.hh"
54 #include "G4DynamicParticle.hh" 54 #include "G4DynamicParticle.hh"
55 #include "G4PhysicsVector.hh" 55 #include "G4PhysicsVector.hh"
56 #include "G4PhysicsLinearVector.hh" 56 #include "G4PhysicsLinearVector.hh"
57 #include "G4eeCrossSections.hh" 57 #include "G4eeCrossSections.hh"
58 58
59 //....oooOO0OOooo........oooOO0OOooo........oo 59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
60 60
61 using namespace std; 61 using namespace std;
62 62
63 G4eeToTwoPiModel::G4eeToTwoPiModel(G4eeCrossSe << 63 G4eeToTwoPiModel::G4eeToTwoPiModel(G4eeCrossSections* cr):
64 G4double maxkinEnergy, << 64 cross(cr)
65 G4double binWidth) <<
66 : G4Vee2hadrons(cr, <<
67 2.0*G4PionPlus::PionPlus()->GetPDGMass() <<
68 maxkinEnergy, <<
69 binWidth) <<
70 { 65 {
71 G4cout << "#####G4eeToTwoPiModel####" << G4e << 66 Initialise();
72 <<
73 massPi = G4PionPlus::PionPlus()->GetPDGMass( <<
74 massRho = 775.5*CLHEP::MeV; <<
75 } 67 }
76 68
77 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
78 70
79 G4eeToTwoPiModel::~G4eeToTwoPiModel() 71 G4eeToTwoPiModel::~G4eeToTwoPiModel()
80 {} 72 {}
81 73
82 //....oooOO0OOooo........oooOO0OOooo........oo 74 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83 75
84 G4double G4eeToTwoPiModel::PeakEnergy() const << 76 void G4eeToTwoPiModel::Initialise()
85 { 77 {
86 return massRho; << 78 massPi = G4PionPlus::PionPlus()->GetPDGMass();
>> 79 massRho = 770.*MeV;
>> 80 highEnergy = 1.*GeV;
>> 81 cross = new G4eeCrossSections();
87 } 82 }
88 83
89 //....oooOO0OOooo........oooOO0OOooo........oo 84 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
90 85
91 G4double G4eeToTwoPiModel::ComputeCrossSection << 86 G4PhysicsVector* G4eeToTwoPiModel::PhysicsVector(G4double emin,
>> 87 G4double emax) const
92 { 88 {
93 return cross->CrossSection2pi(e); << 89 G4double tmin = max(emin, 2.0*massPi);
>> 90 G4double tmax = max(tmin, emax);
>> 91 G4int nbins = (G4int)((tmax - tmin)/(5.*MeV));
>> 92 G4PhysicsVector* v = new G4PhysicsLinearVector(emin,emax,nbins);
>> 93 return v;
94 } 94 }
95 95
96 //....oooOO0OOooo........oooOO0OOooo........oo 96 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
97 97
98 void G4eeToTwoPiModel::SampleSecondaries(std:: << 98 vector<G4DynamicParticle*>* G4eeToTwoPiModel::SampleSecondaries(
99 G4double e, const G4ThreeVector& directi << 99 G4double e, const G4ThreeVector& direction) const
100 { 100 {
101 << 101 vector<G4DynamicParticle*>* newp = new vector<G4DynamicParticle*>;
102 G4double tkin = 0.5*e - massPi; 102 G4double tkin = 0.5*e - massPi;
103 if(tkin < 0.0) tkin = 0.0; 103 if(tkin < 0.0) tkin = 0.0;
104 G4double cost; 104 G4double cost;
105 do { 105 do {
106 cost = 2.0*G4UniformRand() - 1.0; 106 cost = 2.0*G4UniformRand() - 1.0;
107 // Loop checking, 07-Aug-2015, Vladimir Iv <<
108 } while( G4UniformRand() > 1.0 - cost*cost ) 107 } while( G4UniformRand() > 1.0 - cost*cost );
109 108
110 G4double sint = sqrt(1.0 - cost*cost); 109 G4double sint = sqrt(1.0 - cost*cost);
111 G4double phi = twopi * G4UniformRand(); 110 G4double phi = twopi * G4UniformRand();
112 111
113 G4ThreeVector dir(sint*cos(phi),sint*sin(phi 112 G4ThreeVector dir(sint*cos(phi),sint*sin(phi), cost);
114 dir.rotateUz(direction); 113 dir.rotateUz(direction);
115 114
116 // create G4DynamicParticle objects << 115 // create G4DynamicParticle object for delta ray
117 G4DynamicParticle* pip = 116 G4DynamicParticle* pip =
118 new G4DynamicParticle(G4PionPlus::PionPlu 117 new G4DynamicParticle(G4PionPlus::PionPlus(),dir,tkin);
119 G4DynamicParticle* pin = 118 G4DynamicParticle* pin =
120 new G4DynamicParticle(G4PionMinus::PionMi 119 new G4DynamicParticle(G4PionMinus::PionMinus(),-dir,tkin);
121 newp->push_back(pip); 120 newp->push_back(pip);
122 newp->push_back(pin); 121 newp->push_back(pin);
>> 122 return newp;
123 } 123 }
124 124
125 //....oooOO0OOooo........oooOO0OOooo........oo 125 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
126 126
127 127