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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 "G4INCLEtaNElasticChannel.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 EtaNElasticChannel::EtaNElasticChannel(Particle *p1, Particle *p2) 48 : particle1(p1), particle2(p2) 49 { 50 51 } 52 53 EtaNElasticChannel::~EtaNElasticChannel(){ 54 55 } 56 57 void EtaNElasticChannel::fillFinalState(FinalState *fs) { 58 Particle * nucleon; 59 Particle * eta; 60 if(particle1->isNucleon()) { 61 nucleon = particle1; 62 eta = particle2; 63 } else { 64 nucleon = particle2; 65 eta = particle1; 66 } 67 68 G4double plab=KinematicsUtils::momentumInLab(particle1, particle2); 69 70 G4double sh=nucleon->getEnergy()+eta->getEnergy(); 71 G4double mn=nucleon->getMass(); 72 G4double me=eta->getMass(); 73 G4double en=(sh*sh+mn*mn-me*me)/(2*sh); 74 nucleon->setEnergy(en); 75 G4double ee=std::sqrt(en*en-mn*mn+me*me); 76 eta->setEnergy(ee); 77 G4double pn=std::sqrt(en*en-mn*mn); 78 79 ThreeVector mom_nucleon; 80 81 if (plab < 250.) { 82 // Isotropy 83 mom_nucleon = Random::normVector(pn); 84 } 85 86 // From Kamano 87 else { 88 89 const G4double pi=std::acos(-1.0); 90 G4double x1; 91 G4double u1; 92 G4double fteta; 93 G4double teta; 94 G4double fi; 95 96 G4double a0; 97 G4double a1; 98 G4double a2; 99 G4double a3; 100 G4double a4; 101 G4double a5; 102 G4double a6; 103 104 if (plab > 1400.) plab=1400.; // no information on angular distributions above plab=1400 MeV 105 G4double p6=std::pow(plab, 6); 106 G4double p5=std::pow(plab, 5); 107 G4double p4=std::pow(plab, 4); 108 G4double p3=std::pow(plab, 3); 109 G4double p2=std::pow(plab, 2); 110 G4double p1=plab; 111 112 // a6 113 if (plab < 300.) { 114 a6=-8.384000E-08*p1 - 1.15452E-04; 115 } 116 else if (plab < 500.){ 117 a6=1.593966E-13*p4 - 2.619560E-10*p3 + 1.564701E-07*p2 - 3.986627E-05*p1 + 3.622575E-03; 118 } 119 else { 120 a6=6.143615E-20*p6 - 3.157181E-16*p5 + 6.348289E-13*p4 - 6.117961E-10*p3 + 2.764542E-07*p2 - 4.391048E-05*p1 - 1.443857E-03; 121 } 122 // a5 123 if (plab < 650.) { 124 a5=-9.021076E-18*p6 + 2.176771E-14*p5 - 2.136095E-11*p4 + 1.100580E-08*p3 - 3.150857E-06*p2 + 4.761016E-04*p1 - 2.969608E-02; 125 } 126 else if (plab < 950.){ 127 a5=4.424756E-18*p6 - 1.756295E-14*p5 + 2.625428E-11*p4 - 1.678272E-08*p3 + 2.227237E-06*p2 + 2.146666E-03*p1 - 7.065712E-01; 128 } 129 else { 130 a5=2.209585E-19*p6 - 1.546647E-15*p5 + 4.578142E-12*p4 - 7.303856E-09*p3 + 6.604074E-06*p2 - 3.205628E-03*p1 + 6.534893E-01; 131 } 132 // a4 133 if (plab < 700.) { 134 a4=4.826684E-17*p6 - 1.534471E-13*p5 + 1.907868E-10*p4 - 1.192317E-07*p3 + 3.988902E-05*p2 - 6.822100E-03*p1 + 4.684685E-01; 135 } 136 else { 137 a4=-3.245143E-18*p6 + 2.174395E-14*p5 - 6.012288E-11*p4 + 8.772790E-08*p3 - 7.113554E-05*p2 + 3.029285E-02*p1 - 5.237677E+00; 138 } 139 // a3 140 if (plab < 650.) { 141 a3=3.783071E-17*p6 - 1.151454E-13*p5 + 1.357165E-10*p4 - 8.036891E-08*p3 + 2.572396E-05*p2 - 4.245566E-03*p1 + 2.832772E-01; 142 } 143 else { 144 a3=-5.063316E-18*p6 + 3.223757E-14*p5 - 8.435635E-11*p4 + 1.159487E-07*p3 - 8.812510E-05*p2 + 3.500692E-02*p1 - 5.624556E+00; 145 } 146 // a2 147 if (plab < 500.) { 148 a2=-6.085067E-14*p5 + 1.354078E-10*p4 - 1.124158E-07*p3 + 4.292106E-05*p2 - 7.218145E-03*p1 + 4.584962E-01; 149 } 150 else if (plab < 750.) { 151 a2= 9.512730E-11*p4 - 2.362724E-07*p3 + 2.171883E-04*p2 - 8.742722E-02*p1 + 1.309433E+01; 152 } 153 else { 154 a2=-4.228889E-18*p6 + 2.798222E-14*p5 - 7.640831E-11*p4 + 1.100124E-07*p3 - 8.778573E-05*p2 + 3.652772E-02*p1 - 6.025497E+00; 155 } 156 // a1 157 if (plab < 500.) { 158 a1=-1.524408E-14*p5 + 3.007021E-11*p4 - 2.129570E-08*p3 + 5.607250E-06*p2 - 3.001598E-04*p1 + 8.701280E-04; 159 } 160 else if (plab < 750.) { 161 a1=-3.255396E-11*p4 + 8.168681E-08*p3 - 7.447474E-05*p2 + 2.917630E-02*p1 - 4.152037E+00; 162 } 163 else { 164 a1=9.964504E-19*p6 - 6.380168E-15*p5 + 1.638691E-11*p4 - 2.107063E-08*p3 + 1.347462E-05*p2 - 3.318304E-03*p1 - 5.030932E-02; 165 } 166 // a0 167 a0=-3.220143E-17*p6 + 1.789654E-13*p5 - 3.912863E-10*p4 + 4.181510E-07*p3 - 2.147259E-04*p2 + 3.856266E-02*p1 + 2.609971E+00; 168 169 G4double interg1=2.*(a6/7. + a4/5. + a2/3. + a0); // (integral to normalize) 170 G4double f1=(a6+a5+a4+a3+a2+a1+a0)/interg1; // (Max normalized) 171 172 G4int passe1=0; 173 while (passe1==0) { 174 // Sample x from -1 to 1 175 x1=Random::shoot(); 176 if (Random::shoot() > 0.5) x1=-x1; 177 178 // Sample u from 0 to 1 179 u1=Random::shoot(); 180 fteta=(a6*x1*x1*x1*x1*x1*x1+a5*x1*x1*x1*x1*x1+a4*x1*x1*x1*x1+a3*x1*x1*x1+a2*x1*x1+a1*x1+a0)/interg1; 181 // The condition 182 if (u1*f1 < fteta) { 183 teta=std::acos(x1); 184 // std::cout << x1 << " " << fteta << " "<< f1/interg1 << " " << u1 << " " << interg1 << std::endl; 185 passe1=1; 186 } 187 } 188 189 fi=(2.0*pi)*Random::shoot(); 190 191 ThreeVector mom_nucleon1( 192 pn*std::sin(teta)*std::cos(fi), 193 pn*std::sin(teta)*std::sin(fi), 194 pn*std::cos(teta) 195 ); 196 197 mom_nucleon = -mom_nucleon1 ; 198 199 } 200 201 nucleon->setMomentum(mom_nucleon); 202 eta->setMomentum(-mom_nucleon); 203 204 fs->addModifiedParticle(nucleon); 205 fs->addModifiedParticle(eta); 206 207 } 208 } 209