| Geant4 Cross Reference |
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 // INCL++ intra-nuclear cascade model
27 // Alain Boudard, CEA-Saclay, France
28 // Joseph Cugnon, University of Liege, Belgium
29 // Jean-Christophe David, CEA-Saclay, France
30 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
31 // Sylvie Leray, CEA-Saclay, France
32 // Davide Mancusi, CEA-Saclay, France
33 //
34 #define INCLXX_IN_GEANT4_MODE 1
35
36 #include "globals.hh"
37
38 #include "G4INCLNKElasticChannel.hh"
39 #include "G4INCLKinematicsUtils.hh"
40 #include "G4INCLBinaryCollisionAvatar.hh"
41 #include "G4INCLRandom.hh"
42 #include "G4INCLGlobals.hh"
43 #include "G4INCLLogger.hh"
44 #include <algorithm>
45 #include "G4INCLPhaseSpaceGenerator.hh"
46
47 namespace G4INCL {
48
49 NKElasticChannel::NKElasticChannel(Particle *p1, Particle *p2)
50 : particle1(p1), particle2(p2)
51 {}
52
53 NKElasticChannel::~NKElasticChannel(){}
54
55 void NKElasticChannel::fillFinalState(FinalState *fs) {
56
57 Particle *nucleon;
58 Particle *kaon;
59
60 if(particle1->isNucleon()){
61 nucleon = particle1;
62 kaon = particle2;
63 }
64 else{
65 nucleon = particle2;
66 kaon = particle1;
67 }
68
69 const G4double norm = KinematicsUtils::momentumInCM(nucleon, kaon);
70
71 ThreeVector mom_kaon;
72
73 // const G4double pLab = KinematicsUtils::momentumInLab(kaon,nucleon);
74
75 /* if(pLab==0) mom_kaon = Random::normVector();
76 else{
77 const G4double x = kaon->getMomentum().getX();
78 const G4double y = kaon->getMomentum().getY();
79 const G4double z = kaon->getMomentum().getZ();
80
81 const G4double r = std::sqrt(x*x+y*y+z*z);
82 const G4double rho = std::sqrt(x*x+y*y);
83
84 const G4double b = 12. * pLab/2375.; // correspond to the forward slope description at 2375 MeV/c in K- p elastic
85 const G4double cos_theta = std::log(Random::shoot()*(std::exp(b)-std::exp(-b))+std::exp(-b))/b;
86 const G4double sin_theta = std::sqrt(1-cos_theta*cos_theta);
87
88 const G4double cos_phi = std::cos(Random::shoot()*Math::twoPi);
89 const G4double sin_phi = std::sqrt(1-cos_phi*cos_phi);
90
91 if(rho == 0) mom_kaon = ThreeVector(sin_theta*cos_phi,sin_theta*sin_phi,cos_theta);
92 // Rotation in the direction of the incident kaon
93 const G4double px = x/r*cos_theta - y/rho*sin_theta*cos_phi + z/r*x/rho*sin_theta*sin_phi;
94 const G4double py = y/r*cos_theta + x/rho*sin_theta*cos_phi + z/r*y/rho*sin_theta*sin_phi;
95 const G4double pz = z/r*cos_theta - rho/r*sin_theta*sin_phi;
96
97 mom_kaon = ThreeVector(px,py,pz);
98 }*/
99
100 mom_kaon = Random::normVector();
101
102 kaon->setMomentum(mom_kaon*norm);
103 nucleon->setMomentum(-mom_kaon*norm);
104
105 kaon->adjustEnergyFromMomentum();
106 nucleon->adjustEnergyFromMomentum();
107
108 fs->addModifiedParticle(nucleon);
109 fs->addModifiedParticle(kaon);
110
111 }
112 }
113