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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 "G4INCLEtaNToPiNChannel.hh" 38 #include "G4INCLEtaNToPiNChannel.hh"
39 #include "G4INCLKinematicsUtils.hh" 39 #include "G4INCLKinematicsUtils.hh"
40 #include "G4INCLBinaryCollisionAvatar.hh" 40 #include "G4INCLBinaryCollisionAvatar.hh"
41 #include "G4INCLRandom.hh" 41 #include "G4INCLRandom.hh"
42 #include "G4INCLGlobals.hh" 42 #include "G4INCLGlobals.hh"
43 #include "G4INCLLogger.hh" 43 #include "G4INCLLogger.hh"
44 44
45 namespace G4INCL { 45 namespace G4INCL {
46 46
47 EtaNToPiNChannel::EtaNToPiNChannel(Particl 47 EtaNToPiNChannel::EtaNToPiNChannel(Particle *p1, Particle *p2)
48 : particle1(p1), particle2(p2) 48 : particle1(p1), particle2(p2)
49 { 49 {
50 50
51 } 51 }
52 52
53 EtaNToPiNChannel::~EtaNToPiNChannel(){ 53 EtaNToPiNChannel::~EtaNToPiNChannel(){
54 54
55 } 55 }
56 56
57 void EtaNToPiNChannel::fillFinalState(Fina 57 void EtaNToPiNChannel::fillFinalState(FinalState *fs) {
58 Particle * nucleon; 58 Particle * nucleon;
59 Particle * eta; 59 Particle * eta;
60 if(particle1->isNucleon()) { 60 if(particle1->isNucleon()) {
61 nucleon = particle1; 61 nucleon = particle1;
62 eta = particle2; 62 eta = particle2;
63 } else { 63 } else {
64 nucleon = particle2; 64 nucleon = particle2;
65 eta = particle1; 65 eta = particle1;
66 } 66 }
67 67
68 G4double plab=KinematicsUtils::momentu 68 G4double plab=KinematicsUtils::momentumInLab(particle1, particle2);
69 69
70 const G4double r2 = Random::shoot(); 70 const G4double r2 = Random::shoot();
71 if (nucleon->getType() == Neutron) { 71 if (nucleon->getType() == Neutron) {
72 if (r2*3. < 2.) { 72 if (r2*3. < 2.) {
73 nucleon->setType(Proton); 73 nucleon->setType(Proton);
74 eta->setType(PiMinus); 74 eta->setType(PiMinus);
75 } 75 }
76 else { 76 else {
77 nucleon->setType(Neutron); 77 nucleon->setType(Neutron);
78 eta->setType(PiZero); 78 eta->setType(PiZero);
79 } 79 }
80 } 80 }
81 else { 81 else {
82 if (r2*3. < 2.) { 82 if (r2*3. < 2.) {
83 nucleon->setType(Neutron); 83 nucleon->setType(Neutron);
84 eta->setType(PiPlus); 84 eta->setType(PiPlus);
85 } 85 }
86 else { 86 else {
87 nucleon->setType(Proton); 87 nucleon->setType(Proton);
88 eta->setType(PiZero); 88 eta->setType(PiZero);
89 } 89 }
90 } 90 }
91 91
92 G4double sh=nucleon->getEnergy()+eta-> 92 G4double sh=nucleon->getEnergy()+eta->getEnergy();
93 G4double mn=nucleon->getMass(); 93 G4double mn=nucleon->getMass();
94 G4double me=eta->getMass(); 94 G4double me=eta->getMass();
95 G4double en=(sh*sh+mn*mn-me*me)/(2*sh) 95 G4double en=(sh*sh+mn*mn-me*me)/(2*sh);
96 nucleon->setEnergy(en); 96 nucleon->setEnergy(en);
97 G4double ee=std::sqrt(en*en-mn*mn+me*m 97 G4double ee=std::sqrt(en*en-mn*mn+me*me);
98 eta->setEnergy(ee); 98 eta->setEnergy(ee);
99 G4double pn=std::sqrt(en*en-mn*mn); 99 G4double pn=std::sqrt(en*en-mn*mn);
100 100
101 const G4double pi=std::acos(-1.0); 101 const G4double pi=std::acos(-1.0);
102 G4double x1; 102 G4double x1;
103 G4double u1; 103 G4double u1;
104 G4double fteta; 104 G4double fteta;
105 G4double teta; 105 G4double teta;
106 G4double fi; 106 G4double fi;
107 107
108 G4double a0; 108 G4double a0;
109 G4double a1; 109 G4double a1;
110 G4double a2; 110 G4double a2;
111 G4double a3; 111 G4double a3;
112 G4double a4; 112 G4double a4;
113 G4double a5; 113 G4double a5;
114 G4double a6; 114 G4double a6;
115 115
116 if (plab > 1400.) plab=1400.; // no in 116 if (plab > 1400.) plab=1400.; // no information on angular distributions above plab=1400 MeV
117 G4double p6=std::pow(plab, 6); 117 G4double p6=std::pow(plab, 6);
118 G4double p5=std::pow(plab, 5); 118 G4double p5=std::pow(plab, 5);
119 G4double p4=std::pow(plab, 4); 119 G4double p4=std::pow(plab, 4);
120 G4double p3=std::pow(plab, 3); 120 G4double p3=std::pow(plab, 3);
121 G4double p2=std::pow(plab, 2); 121 G4double p2=std::pow(plab, 2);
122 G4double p1=plab; 122 G4double p1=plab;
123 123
124 // a6 124 // a6
125 if (plab <= 600.) { 125 if (plab <= 600.) {
126 a6=5.721872E-18*p6 - 1.063594E-14* 126 a6=5.721872E-18*p6 - 1.063594E-14*p5 +
127 7.812226E-12*p4 - 2.947343E-09*p3 127 7.812226E-12*p4 - 2.947343E-09*p3 +
128 5.955500E-07*p2 - 6.081534E-05*p1 128 5.955500E-07*p2 - 6.081534E-05*p1 + 2.418893E-03;
129 } 129 }
130 else { 130 else {
131 a6=1.549323E-18*p6 - 9.570613E-15* 131 a6=1.549323E-18*p6 - 9.570613E-15*p5 +
132 2.428560E-11*p4 - 3.237490E-08*p3 132 2.428560E-11*p4 - 3.237490E-08*p3 +
133 2.385312E-05*p2 - 9.167580E-03*p1 133 2.385312E-05*p2 - 9.167580E-03*p1 + 1.426952E+00;
134 } 134 }
135 // a5 135 // a5
136 if (plab <= 700.) { 136 if (plab <= 700.) {
137 a5=-3.858406E-16*p6 + 7.397533E-13 137 a5=-3.858406E-16*p6 + 7.397533E-13*p5 -
138 5.344420E-10*p4 + 1.865842E-07*p3 138 5.344420E-10*p4 + 1.865842E-07*p3 -
139 3.234292E-05*p2 + 2.552380E-03*p1 139 3.234292E-05*p2 + 2.552380E-03*p1 - 6.810842E-02;
140 } 140 }
141 else { 141 else {
142 a5=-3.775268E-17*p6 + 2.445059E-13 142 a5=-3.775268E-17*p6 + 2.445059E-13*p5 -
143 6.503137E-10*p4 + 9.065678E-07*p3 143 6.503137E-10*p4 + 9.065678E-07*p3 -
144 6.953576E-04*p2 + 2.757524E-01*p1 144 6.953576E-04*p2 + 2.757524E-01*p1 - 4.328028E+01;
145 } 145 }
146 // a4 146 // a4
147 if (plab <= 550.) { 147 if (plab <= 550.) {
148 a4=-2.051840E-16*p6 + 3.858551E-13 148 a4=-2.051840E-16*p6 + 3.858551E-13*p5 -
149 3.166229E-10*p4 + 1.353545E-07*p3 149 3.166229E-10*p4 + 1.353545E-07*p3 -
150 2.631251E-05*p2 + 2.109593E-03*p1 150 2.631251E-05*p2 + 2.109593E-03*p1 - 5.633076E-02;
151 } 151 }
152 else if (plab <= 650.) { 152 else if (plab <= 650.) {
153 a4=-1.698136E-05*p2 + 1.827203E-02 153 a4=-1.698136E-05*p2 + 1.827203E-02*p1 - 4.482122E+00;
154 } 154 }
155 else { 155 else {
156 a4=-2.808337E-17*p6 + 1.640033E-13 156 a4=-2.808337E-17*p6 + 1.640033E-13*p5 -
157 3.820460E-10*p4 + 4.452787E-07*p3 157 3.820460E-10*p4 + 4.452787E-07*p3 -
158 2.621981E-04*p2 + 6.530743E-02*p1 158 2.621981E-04*p2 + 6.530743E-02*p1 - 2.447717E+00;
159 } 159 }
160 // a3 160 // a3
161 if (plab <= 700.) { 161 if (plab <= 700.) {
162 a3=7.061866E-16*p6 - 1.356389E-12* 162 a3=7.061866E-16*p6 - 1.356389E-12*p5 +
163 9.783322E-10*p4 - 3.407333E-07*p3 163 9.783322E-10*p4 - 3.407333E-07*p3 +
164 5.903545E-05*p2 - 4.735559E-03*p1 164 5.903545E-05*p2 - 4.735559E-03*p1 + 1.270435E-01;
165 } 165 }
166 else { 166 else {
167 a3=1.138088E-16*p6 - 7.459580E-13* 167 a3=1.138088E-16*p6 - 7.459580E-13*p5 +
168 2.015156E-09*p4 - 2.867416E-06*p3 168 2.015156E-09*p4 - 2.867416E-06*p3 +
169 2.261028E-03*p2 - 9.323442E-01*p1 169 2.261028E-03*p2 - 9.323442E-01*p1 + 1.552846E+02;
170 } 170 }
171 // a2 171 // a2
172 if (plab <= 550.) { 172 if (plab <= 550.) {
173 a2=1.352952E-17*p6 - 3.030435E-13* 173 a2=1.352952E-17*p6 - 3.030435E-13*p5 +
174 4.624668E-10*p4 - 2.759605E-07*p3 174 4.624668E-10*p4 - 2.759605E-07*p3 +
175 6.996373E-05*p2 - 4.745692E-03*p1 175 6.996373E-05*p2 - 4.745692E-03*p1 + 1.524349E-01;
176 } 176 }
177 else if (plab <= 700.) { 177 else if (plab <= 700.) {
178 a2=5.514651E-08*p3 - 8.734112E-05* 178 a2=5.514651E-08*p3 - 8.734112E-05*p2 + 4.108704E-02*p1 - 5.116601E+00;
179 } 179 }
180 else { 180 else {
181 a2=5.621795E-17*p6 - 3.701960E-13* 181 a2=5.621795E-17*p6 - 3.701960E-13*p5 +
182 1.005796E-09*p4 - 1.441294E-06*p3 182 1.005796E-09*p4 - 1.441294E-06*p3 +
183 1.146234E-03*p2 - 4.775194E-01*p1 183 1.146234E-03*p2 - 4.775194E-01*p1 + 8.084776E+01;
184 } 184 }
185 // a1 185 // a1
186 if (plab <= 500.) { 186 if (plab <= 500.) {
187 a1=-2.425827E-16*p6 + 4.113350E-13 187 a1=-2.425827E-16*p6 + 4.113350E-13*p5 -
188 2.342298E-10*p4 + 4.934322E-08*p3 188 2.342298E-10*p4 + 4.934322E-08*p3 -
189 3.564530E-06*p2 + 6.516398E-04*p1 189 3.564530E-06*p2 + 6.516398E-04*p1 + 2.547230E-01;
190 } 190 }
191 else if (plab <= 700.) { 191 else if (plab <= 700.) {
192 a1=-1.824213E-10*p4 + 3.599251E-07 192 a1=-1.824213E-10*p4 + 3.599251E-07*p3 -
193 2.480862E-04*p2 + 6.894931E-02*p1 193 2.480862E-04*p2 + 6.894931E-02*p1 - 5.760562E+00;
194 } 194 }
195 else { 195 else {
196 a1=-5.139366E-17*p6 + 3.408224E-13 196 a1=-5.139366E-17*p6 + 3.408224E-13*p5 -
197 9.341903E-10*p4 + 1.354028E-06*p3 197 9.341903E-10*p4 + 1.354028E-06*p3 -
198 1.093509E-03*p2 + 4.653326E-01*p1 198 1.093509E-03*p2 + 4.653326E-01*p1 - 8.068436E+01;
199 } 199 }
200 // a0 200 // a0
201 if (plab <= 400.) { 201 if (plab <= 400.) {
202 a0=1.160837E-13*p6 - 1.813002E-10* 202 a0=1.160837E-13*p6 - 1.813002E-10*p5 +
203 1.155391E-07*p4 - 3.862737E-05*p3 203 1.155391E-07*p4 - 3.862737E-05*p3 +
204 7.230513E-03*p2 - 7.469799E-01*p1 204 7.230513E-03*p2 - 7.469799E-01*p1 + 3.830064E+01;
205 } 205 }
206 else if (plab <= 700.) { 206 else if (plab <= 700.) {
207 a0=2.267918E-14*p6 - 7.593899E-11* 207 a0=2.267918E-14*p6 - 7.593899E-11*p5 +
208 1.049849E-07*p4 - 7.669301E-05*p3 208 1.049849E-07*p4 - 7.669301E-05*p3 +
209 3.123846E-02*p2 - 6.737221E+00*p1 209 3.123846E-02*p2 - 6.737221E+00*p1 + 6.032010E+02;
210 } 210 }
211 else { 211 else {
212 a0=-1.851188E-17*p6 + 1.281122E-13 212 a0=-1.851188E-17*p6 + 1.281122E-13*p5 -
213 3.686161E-10*p4 + 5.644116E-07*p3 213 3.686161E-10*p4 + 5.644116E-07*p3 -
214 4.845757E-04*p2 + 2.203918E-01*p1 214 4.845757E-04*p2 + 2.203918E-01*p1 - 4.100383E+01;
215 } 215 }
216 216
217 G4double interg1=2.*(a6/7. + a4/5. + a 217 G4double interg1=2.*(a6/7. + a4/5. + a2/3. + a0); // (integral to normalize)
218 G4double f1=(a6+a5+a4+a3+a2+a1+a0)/int 218 G4double f1=(a6+a5+a4+a3+a2+a1+a0)/interg1; // (Max normalized)
219 219
220 G4int passe1=0; 220 G4int passe1=0;
221 while (passe1==0) { 221 while (passe1==0) {
222 // Sample x from -1 to 1 222 // Sample x from -1 to 1
223 x1=Random::shoot(); 223 x1=Random::shoot();
224 if (Random::shoot() > 0.5) x1=-x1; 224 if (Random::shoot() > 0.5) x1=-x1;
225 225
226 // Sample u from 0 to 1 226 // Sample u from 0 to 1
227 u1=Random::shoot(); 227 u1=Random::shoot();
228 fteta=(a6*x1*x1*x1*x1*x1*x1+a5*x1* 228 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;
229 // The condition 229 // The condition
230 if (u1*f1 < fteta) { 230 if (u1*f1 < fteta) {
231 teta=std::acos(x1); 231 teta=std::acos(x1);
232 // std::cout << x1 << 232 // std::cout << x1 << " " << fteta << " "<< f1/interg1 << " " << u1 << " " << interg1 << std::endl;
233 passe1=1; 233 passe1=1;
234 } 234 }
235 } 235 }
236 236
237 fi=(2.0*pi)*Random::shoot(); 237 fi=(2.0*pi)*Random::shoot();
238 238
239 ThreeVector mom_nucleon( 239 ThreeVector mom_nucleon(
240 pn*std::sin(te 240 pn*std::sin(teta)*std::cos(fi),
241 pn*std::sin(te 241 pn*std::sin(teta)*std::sin(fi),
242 pn*std::cos(te 242 pn*std::cos(teta)
243 ); 243 );
244 // end real distribution 244 // end real distribution
245 245
246 nucleon->setMomentum(-mom_nucleon); 246 nucleon->setMomentum(-mom_nucleon);
247 eta->setMomentum(mom_nucleon); 247 eta->setMomentum(mom_nucleon);
248 248
249 fs->addModifiedParticle(nucleon); 249 fs->addModifiedParticle(nucleon);
250 fs->addModifiedParticle(eta); 250 fs->addModifiedParticle(eta);
251 } 251 }
252 252
253 } 253 }
254 254