279 lines
9.3 KiB
C++
279 lines
9.3 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// INCL++ intra-nuclear cascade model
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// Alain Boudard, CEA-Saclay, France
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// Joseph Cugnon, University of Liege, Belgium
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// Jean-Christophe David, CEA-Saclay, France
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// Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
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// Sylvie Leray, CEA-Saclay, France
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// Davide Mancusi, CEA-Saclay, France
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//
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#define INCLXX_IN_GEANT4_MODE 1
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#include "globals.hh"
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#include "G4INCLNNbarToNNbarpiChannel.hh"
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#include "G4INCLKinematicsUtils.hh"
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#include "G4INCLBinaryCollisionAvatar.hh"
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#include "G4INCLRandom.hh"
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#include "G4INCLGlobals.hh"
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#include "G4INCLLogger.hh"
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#include <algorithm>
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#include "G4INCLPhaseSpaceGenerator.hh"
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namespace G4INCL {
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NNbarToNNbarpiChannel::NNbarToNNbarpiChannel(Particle *p1, Particle *p2)
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: particle1(p1), particle2(p2)
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{}
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NNbarToNNbarpiChannel::~NNbarToNNbarpiChannel(){}
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void NNbarToNNbarpiChannel::fillFinalState(FinalState *fs) {
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//brief ppbar
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// p pbar -> p pbar pi0 (BFMM 185)
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// p pbar -> p nbar pi- (BFMM 188)
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// p pbar -> n pbar pi+ (BFMM 199)
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// p pbar -> n nbar pi0 (no data)
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//
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//brief npbar
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// n pbar -> p pbar pi- (BFMM 491)
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// n pbar -> p nbar pion (impossible)
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// n pbar -> n pbar pi0 (BFMM 495)
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// n pbar -> n nbar pi- (same as BFMM 188)
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//
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//brief nnbar
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// n nbar -> n nbar pi0 (same as BFMM 185)
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// n nbar -> p nbar pi- (same as BFMM 188)
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// n nbar -> n pbar pi+ (same as BFMM 199)
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// n nbar -> p pbar pi0 (no data)
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//
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//brief pnbar
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// p nbar -> p pbar pi+ (same as BFMM 491)
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// p nbar -> n pbar pion (impossible)
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// p nbar -> p nbar pi0 (same as BFMM 495)
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// p nbar -> n nbar pi+ (same as BFMM 188)
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Particle *nucleon;
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Particle *antinucleon;
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if(particle1->isNucleon()){
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nucleon = particle1;
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antinucleon = particle2;
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}
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else{
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nucleon = particle2;
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antinucleon = particle1;
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}
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const G4double plab = 0.001*KinematicsUtils::momentumInLab(particle1, particle2);
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const G4double sqrtS = KinematicsUtils::totalEnergyInCM(nucleon, antinucleon);
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const G4double rdm = Random::shoot();
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const std::vector<G4double> BFMM185 = {-0.734, 0.841, 0.905, 3.415, -2.316, 0.775};
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//{22.781, -22.602, -0.752, -11.036, 1.548, 0.775};
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//const G4double Eth_PPbar_PPbar_pi0 = 0.775;
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const std::vector<G4double> BFMM188 = { -0.442, 0.501, 0.002, 3.434, -1.201, 0.798};
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//const G4double Eth_PPbar_PNbar_pim = 0.798;
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const std::vector<G4double> BFMM199 = {-2.025, 2.055, -2.355, 6.064, -2.004, 0.798};
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//const G4double Eth_PPbar_NPbar_pip = 0.798;
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const std::vector<G4double> BFMM491 = {24.125, -20.669, -1.534, -19.573, 4.493, 0.787};
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//const G4double Eth_NPbar_PPbar_pim = 0.787;
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const std::vector<G4double> BFMM495 = {-0.650, -0.140, -0.058, 5.166, -1.705, 0.777};
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//const G4double Eth_NPbar_NPbar_pi0 = 0.777;
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// pnbar total is same as for npbar
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// ppbar total is same as for nnbar
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const G4double totalppbar = KinematicsUtils::compute_xs(std::move(BFMM199), plab) +KinematicsUtils::compute_xs(BFMM185, plab) +KinematicsUtils::compute_xs(BFMM188, plab);
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const G4double totalpnbar = KinematicsUtils::compute_xs(BFMM491, plab) +KinematicsUtils::compute_xs(BFMM495, plab) +KinematicsUtils::compute_xs(BFMM188, plab);
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const G4double totalnnbar = totalppbar;
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const G4double totalnpbar = totalpnbar;
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ParticleType PionType;
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//setting types of new particles
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if(nucleon->getType()==Proton){
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if(antinucleon->getType()==antiProton){ // ppbar case
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if(rdm*totalppbar < KinematicsUtils::compute_xs(BFMM185, plab)){ // ppbarpi0 case
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PionType = PiZero;
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if(rdm<0.5){
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nucleon->setType(Proton);
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antinucleon->setType(antiProton);
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}
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else{
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nucleon->setType(antiProton);
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antinucleon->setType(Proton);
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}
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}
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else if(rdm*totalppbar < KinematicsUtils::compute_xs(std::move(BFMM185), plab)+KinematicsUtils::compute_xs(std::move(BFMM188), plab)){ //pnbarpi- case
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PionType = PiMinus;
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if(rdm<0.5){
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nucleon->setType(Proton);
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antinucleon->setType(antiNeutron);
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}
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else{
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nucleon->setType(antiNeutron);
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antinucleon->setType(Proton);
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}
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}
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else{ // npbarpi+ case
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PionType = PiPlus;
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if(rdm<0.5){
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nucleon->setType(Neutron);
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antinucleon->setType(antiProton);
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}
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else{
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nucleon->setType(antiProton);
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antinucleon->setType(Neutron);
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}
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}
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}
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else{ //antiNeutron (pnbar case)
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if(rdm*totalpnbar < KinematicsUtils::compute_xs(BFMM491, plab)){ // ppbarpi+ case
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PionType = PiPlus;
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if(rdm<0.5){
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nucleon->setType(Proton);
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antinucleon->setType(antiProton);
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}
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else{
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nucleon->setType(antiProton);
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antinucleon->setType(Proton);
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}
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}
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else if(rdm*totalpnbar < KinematicsUtils::compute_xs(BFMM491, plab)+KinematicsUtils::compute_xs(BFMM495, plab)){ //pnbarpi0 case
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PionType = PiZero;
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if(rdm<0.5){
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nucleon->setType(Proton);
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antinucleon->setType(antiNeutron);
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}
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else{
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nucleon->setType(antiNeutron);
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antinucleon->setType(Proton);
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}
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}
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else{ // nnbarpi+ case
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PionType = PiPlus;
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if(rdm<0.5){
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nucleon->setType(Neutron);
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antinucleon->setType(antiNeutron);
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}
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else{
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nucleon->setType(antiNeutron);
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antinucleon->setType(Neutron);
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}
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}
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}
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}
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else{ // neutron
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if(antinucleon->getType()==antiProton){ //npbar case
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if(rdm*totalnpbar < KinematicsUtils::compute_xs(BFMM491, plab)){ // ppbarpi- case
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PionType = PiMinus;
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if(rdm<0.5){
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nucleon->setType(Proton);
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antinucleon->setType(antiProton);
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}
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else{
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nucleon->setType(antiProton);
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antinucleon->setType(Proton);
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}
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}
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else if(rdm*totalnpbar < KinematicsUtils::compute_xs(BFMM491, plab)+KinematicsUtils::compute_xs(BFMM495, plab)){ //npbarpi0 case
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PionType = PiZero;
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if(rdm<0.5){
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nucleon->setType(Neutron);
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antinucleon->setType(antiProton);
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}
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else{
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nucleon->setType(antiProton);
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antinucleon->setType(Neutron);
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}
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}
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else{ // nnbarpi- case
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PionType = PiMinus;
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if(rdm<0.5){
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nucleon->setType(Neutron);
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antinucleon->setType(antiNeutron);
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}
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else{
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nucleon->setType(antiNeutron);
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antinucleon->setType(Neutron);
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}
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}
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}
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else{ //antiNeutron (nnbar case)
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if(rdm*totalnnbar < KinematicsUtils::compute_xs(BFMM185, plab)){ // nnbarpi0 case
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PionType = PiZero;
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if(rdm<0.5){
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nucleon->setType(Neutron);
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antinucleon->setType(antiNeutron);
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}
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else{
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nucleon->setType(antiNeutron);
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antinucleon->setType(Neutron);
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}
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}
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else if(rdm*totalnnbar < KinematicsUtils::compute_xs(BFMM185, plab)+KinematicsUtils::compute_xs(BFMM188, plab)){ //pnbarpi- case
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PionType = PiMinus;
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if(rdm<0.5){
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nucleon->setType(Proton);
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antinucleon->setType(antiNeutron);
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}
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else{
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nucleon->setType(antiNeutron);
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antinucleon->setType(Proton);
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}
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}
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else{ // npbarpi+ case
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PionType = PiPlus;
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if(rdm<0.5){
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nucleon->setType(Neutron);
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antinucleon->setType(antiProton);
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}
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else{
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nucleon->setType(antiProton);
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antinucleon->setType(Neutron);
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}
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}
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}
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}
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ParticleList list;
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list.push_back(nucleon);
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list.push_back(antinucleon);
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const ThreeVector &rcol = nucleon->getPosition();
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const ThreeVector zero;
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Particle *pion = new Particle(PionType,zero,rcol);
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list.push_back(pion);
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PhaseSpaceGenerator::generate(sqrtS, list);
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fs->addModifiedParticle(nucleon);
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fs->addModifiedParticle(antinucleon);
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fs->addCreatedParticle(pion);
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}
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}
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