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1 // 1 2 // ******************************************* 3 // * License and Disclaimer 4 // * 5 // * The Geant4 software is copyright of th 6 // * the Geant4 Collaboration. It is provided 7 // * conditions of the Geant4 Software License 8 // * LICENSE and available at http://cern.ch/ 9 // * include a list of copyright holders. 10 // * 11 // * Neither the authors of this software syst 12 // * institutes,nor the agencies providing fin 13 // * work make any representation or warran 14 // * regarding this software system or assum 15 // * use. Please see the license in the file 16 // * for the full disclaimer and the limitatio 17 // * 18 // * This code implementation is the result 19 // * technical work of the GEANT4 collaboratio 20 // * By using, copying, modifying or distri 21 // * any work based on the software) you ag 22 // * use in resulting scientific publicati 23 // * acceptance of all terms of the Geant4 Sof 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 H 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 "G4INCLPiNElasticChannel.hh" 39 #include "G4INCLKinematicsUtils.hh" 40 #include "G4INCLBinaryCollisionAvatar.hh" 41 #include "G4INCLRandom.hh" 42 #include "G4INCLGlobals.hh" 43 #include "G4INCLLogger.hh" 44 45 namespace G4INCL { 46 47 PiNElasticChannel::PiNElasticChannel(Parti 48 : particle1(p1), particle2(p2) 49 { 50 51 } 52 53 PiNElasticChannel::~PiNElasticChannel(){ 54 55 } 56 57 void PiNElasticChannel::fillFinalState(Fin 58 Particle * nucleon; 59 Particle * pion; 60 if(particle1->isNucleon()) { 61 nucleon = particle1; 62 pion = particle2; 63 } else { 64 nucleon = particle2; 65 pion = particle1; 66 } 67 68 G4double bpn=8e-6; // B-parameter of 69 G4double px_nucleon=nucleon->getMoment 70 G4double py_nucleon=nucleon->getMoment 71 G4double pz_nucleon=nucleon->getMoment 72 G4double cnorm1=px_nucleon*px_nucleon+ 73 G4double cnorm2=std::sqrt(cnorm1); 74 G4double tnorm=cnorm1+pz_nucleon*pz_nu 75 G4double cnorm=std::sqrt(tnorm); 76 G4double btm=std::exp(-4.*tnorm*bpn); 77 G4double rndm=Random::shoot(); 78 G4double yrn=1.-rndm*(1.-btm); 79 G4double tt=std::log(yrn)/bpn; 80 G4double ctheta=1.+0.5*tt/tnorm; 81 G4double stheta=std::sqrt(1.-ctheta*ct 82 G4double t7=1.-2.*Random::shoot(); 83 G4double t8=std::sqrt(1-t7*t7); 84 G4double t1=-py_nucleon/cnorm2; 85 G4double t2=px_nucleon/cnorm2; 86 G4double t4=t2*pz_nucleon/cnorm; 87 G4double t5=-t1*pz_nucleon/cnorm; 88 G4double t6=-cnorm2/cnorm; 89 ThreeVector mom_nucleon( 90 px_nucleon*cth 91 py_nucleon*cth 92 pz_nucleon*cth 93 ); 94 nucleon->setMomentum(mom_nucleon); 95 pion->setMomentum(-mom_nucleon); 96 97 #ifdef INCLXX_IN_GEANT4_MODE 98 ParticleType startingNucleonType = nucleon 99 ParticleType startingPionType = pion->getT 100 #endif 101 102 G4int iso=ParticleTable::getIsospin(nu 103 if (iso == 1 || iso == -1) { 104 rndm=3*Random::shoot(); 105 if (rndm < 1.) { 106 ParticleType nucleonType=Parti 107 nucleon->setType(nucleonType); 108 ParticleType pionType=Particle 109 pion->setType(pionType); 110 } 111 else { 112 ParticleType nucleonType=Parti 113 nucleon->setType(nucleonType); 114 pion->setType(PiZero); 115 } 116 } 117 else { // Useless 118 ParticleType nucleonType=ParticleT 119 nucleon->setType(nucleonType); 120 ParticleType pionType=ParticleTabl 121 pion->setType(pionType); 122 } 123 124 #ifdef INCLXX_IN_GEANT4_MODE 125 // Erase the parent resonance information 126 if ( startingNucleonType != nucleon->getTy 127 nucleon->setParentResonancePDGCode(0); 128 nucleon->setParentResonanceID(0); 129 pion->setParentResonancePDGCode(0); 130 pion->setParentResonanceID(0); 131 } 132 #endif 133 134 fs->addModifiedParticle(nucleon); 135 fs->addModifiedParticle(pion); 136 } 137 138 } 139