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25 // 25 //
26 // INCL++ intra-nuclear cascade model 26 // INCL++ intra-nuclear cascade model
27 // Alain Boudard, CEA-Saclay, France 27 // Alain Boudard, CEA-Saclay, France
28 // Joseph Cugnon, University of Liege, Belgium 28 // Joseph Cugnon, University of Liege, Belgium
29 // Jean-Christophe David, CEA-Saclay, France 29 // Jean-Christophe David, CEA-Saclay, France
30 // Pekka Kaitaniemi, CEA-Saclay, France, and H 30 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
31 // Sylvie Leray, CEA-Saclay, France 31 // Sylvie Leray, CEA-Saclay, France
32 // Davide Mancusi, CEA-Saclay, France 32 // Davide Mancusi, CEA-Saclay, France
33 // 33 //
34 #define INCLXX_IN_GEANT4_MODE 1 34 #define INCLXX_IN_GEANT4_MODE 1
35 35
36 #include "globals.hh" 36 #include "globals.hh"
37 37
38 #include "G4INCLPhaseSpaceKopylov.hh" 38 #include "G4INCLPhaseSpaceKopylov.hh"
39 #include "G4INCLRandom.hh" 39 #include "G4INCLRandom.hh"
40 #include "G4INCLKinematicsUtils.hh" 40 #include "G4INCLKinematicsUtils.hh"
41 #include <algorithm> 41 #include <algorithm>
42 #include <numeric> 42 #include <numeric>
43 #include <functional> 43 #include <functional>
44 44
45 namespace G4INCL { 45 namespace G4INCL {
46 46
47 G4double PhaseSpaceKopylov::betaKopylov(G4in 47 G4double PhaseSpaceKopylov::betaKopylov(G4int K) const {
48 G4int N = 3*K - 5; 48 G4int N = 3*K - 5;
49 G4double xN = G4double(N); 49 G4double xN = G4double(N);
50 G4double Fmax = std::sqrt(std::pow(xN/(xN+ 50 G4double Fmax = std::sqrt(std::pow(xN/(xN+1.),N)/(xN+1.));
51 51
52 G4double F, chi; 52 G4double F, chi;
53 unsigned long loopCounter = 0; 53 unsigned long loopCounter = 0;
54 const unsigned long maxLoopCounter = 10000 54 const unsigned long maxLoopCounter = 10000000;
55 do { 55 do {
56 chi = Random::shoot(); 56 chi = Random::shoot();
57 F = std::sqrt(std::pow(chi,N)*(1.-chi)); 57 F = std::sqrt(std::pow(chi,N)*(1.-chi));
58 ++loopCounter; 58 ++loopCounter;
59 } while (loopCounter<maxLoopCounter && Fma 59 } while (loopCounter<maxLoopCounter && Fmax*Random::shoot() > F); /* Loop checking, 10.07.2015, D.Mancusi */
60 return chi; 60 return chi;
61 } 61 }
62 62
63 void PhaseSpaceKopylov::generate(const G4dou 63 void PhaseSpaceKopylov::generate(const G4double sqrtS, ParticleList &particles) {
64 64
65 boostV.setX(0.0); 65 boostV.setX(0.0);
66 boostV.setY(0.0); 66 boostV.setY(0.0);
67 boostV.setZ(0.0); 67 boostV.setZ(0.0);
68 68
69 const std::size_t N = particles.size(); 69 const std::size_t N = particles.size();
70 masses.resize(N); 70 masses.resize(N);
71 sumMasses.resize(N); 71 sumMasses.resize(N);
72 std::transform(particles.begin(), particle 72 std::transform(particles.begin(), particles.end(), masses.begin(), std::mem_fn(&Particle::getMass));
73 std::partial_sum(masses.begin(), masses.en 73 std::partial_sum(masses.begin(), masses.end(), sumMasses.begin());
74 74
75 G4double PFragMagCM = 0.0; 75 G4double PFragMagCM = 0.0;
76 G4double T = sqrtS-sumMasses.back(); 76 G4double T = sqrtS-sumMasses.back();
77 // assert(T>-1.e-5); 77 // assert(T>-1.e-5);
78 if(T<0.) 78 if(T<0.)
79 T=0.; 79 T=0.;
80 80
81 // The first particle in the list will pic 81 // The first particle in the list will pick up all the recoil
82 Particle *restParticle = particles.front() 82 Particle *restParticle = particles.front();
83 restParticle->setMass(sqrtS); 83 restParticle->setMass(sqrtS);
84 restParticle->adjustEnergyFromMomentum(); 84 restParticle->adjustEnergyFromMomentum();
85 85
86 G4int k=G4int(N-1); 86 G4int k=G4int(N-1);
87 for (auto p=particles.rbegin(); k>0; ++p, 87 for (auto p=particles.rbegin(); k>0; ++p, --k) {
88 const G4double mu = sumMasses[k-1]; 88 const G4double mu = sumMasses[k-1];
89 T *= (k>1) ? betaKopylov(k) : 0.; 89 T *= (k>1) ? betaKopylov(k) : 0.;
90 90
91 const G4double restMass = mu + T; 91 const G4double restMass = mu + T;
92 92
93 PFragMagCM = KinematicsUtils::momentumIn 93 PFragMagCM = KinematicsUtils::momentumInCM(restParticle->getMass(), masses[k], restMass);
94 PFragCM = Random::normVector(PFragMagCM) 94 PFragCM = Random::normVector(PFragMagCM);
95 (*p)->setMomentum(PFragCM); 95 (*p)->setMomentum(PFragCM);
96 (*p)->adjustEnergyFromMomentum(); 96 (*p)->adjustEnergyFromMomentum();
97 restParticle->setMass(restMass); 97 restParticle->setMass(restMass);
98 restParticle->setMomentum(-PFragCM); 98 restParticle->setMomentum(-PFragCM);
99 restParticle->adjustEnergyFromMomentum() 99 restParticle->adjustEnergyFromMomentum();
100 100
101 (*p)->boost(boostV); 101 (*p)->boost(boostV);
102 restParticle->boost(boostV); 102 restParticle->boost(boostV);
103 103
104 boostV = -restParticle->boostVector(); 104 boostV = -restParticle->boostVector();
105 } 105 }
106 restParticle->setMass(masses[0]); 106 restParticle->setMass(masses[0]);
107 restParticle->adjustEnergyFromMomentum(); 107 restParticle->adjustEnergyFromMomentum();
108 } 108 }
109 109
110 } 110 }
111 111