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>> 27 // $Id: G4ElasticHNScattering.cc 100828 2016-11-02 15:25:59Z gcosmo $
27 // 28 //
28 29
29 // ------------------------------------------- 30 // ------------------------------------------------------------
30 // GEANT 4 class implemetation file 31 // GEANT 4 class implemetation file
31 // 32 //
32 // ---------------- G4ElasticHNScattering 33 // ---------------- G4ElasticHNScattering --------------
33 // by V. Uzhinsky, March 200 34 // by V. Uzhinsky, March 2008.
34 // elastic scattering used by Frit 35 // elastic scattering used by Fritiof model
35 // Take a projectile and a tar 36 // Take a projectile and a target
36 // scatter the projectile and 37 // scatter the projectile and target
37 // ------------------------------------------- 38 // ---------------------------------------------------------------------
38 39
39 #include "globals.hh" 40 #include "globals.hh"
40 #include "Randomize.hh" 41 #include "Randomize.hh"
41 #include "G4PhysicalConstants.hh" 42 #include "G4PhysicalConstants.hh"
42 #include "G4SystemOfUnits.hh" <<
43 43
44 #include "G4ElasticHNScattering.hh" 44 #include "G4ElasticHNScattering.hh"
45 #include "G4LorentzRotation.hh" 45 #include "G4LorentzRotation.hh"
46 #include "G4ThreeVector.hh" 46 #include "G4ThreeVector.hh"
47 #include "G4ParticleDefinition.hh" 47 #include "G4ParticleDefinition.hh"
48 #include "G4VSplitableHadron.hh" 48 #include "G4VSplitableHadron.hh"
49 #include "G4ExcitedString.hh" 49 #include "G4ExcitedString.hh"
50 #include "G4FTFParameters.hh" 50 #include "G4FTFParameters.hh"
51 51
52 #include "G4SampleResonance.hh" 52 #include "G4SampleResonance.hh"
53 53
54 #include "G4Exp.hh" 54 #include "G4Exp.hh"
55 #include "G4Log.hh" 55 #include "G4Log.hh"
56 56
57 //============================================ 57 //============================================================================
58 58
59 G4ElasticHNScattering::G4ElasticHNScattering() 59 G4ElasticHNScattering::G4ElasticHNScattering() {}
60 60
61 61
62 //============================================ 62 //============================================================================
63 63
64 G4bool G4ElasticHNScattering::ElasticScatterin 64 G4bool G4ElasticHNScattering::ElasticScattering( G4VSplitableHadron* projectile,
65 65 G4VSplitableHadron* target,
66 66 G4FTFParameters* theParameters ) const {
67 projectile->IncrementCollisionCount( 1 ); 67 projectile->IncrementCollisionCount( 1 );
68 target->IncrementCollisionCount( 1 ); 68 target->IncrementCollisionCount( 1 );
69 69
70 if ( projectile->Get4Momentum().z() < 0.0 ) << 70 G4SampleResonance BrW;
71 71
72 // Projectile parameters 72 // Projectile parameters
73 G4LorentzVector Pprojectile = projectile->Ge 73 G4LorentzVector Pprojectile = projectile->Get4Momentum();
74 G4double M0projectile = Pprojectile.mag(); << 74 if ( Pprojectile.z() < 0.0 ) return false;
>> 75 G4bool PutOnMassShell( false );
>> 76 G4double M0projectile = Pprojectile.mag();
>> 77 //if ( M0projectile < projectile->GetDefinition()->GetPDGMass() ) {
>> 78
>> 79 G4double MminProjectile=BrW.GetMinimumMass(projectile->GetDefinition());
>> 80
>> 81 if ( M0projectile < MminProjectile ) {
>> 82 PutOnMassShell = true;
>> 83 M0projectile = projectile->GetDefinition()->GetPDGMass();
>> 84 }
75 G4double M0projectile2 = M0projectile * M0pr 85 G4double M0projectile2 = M0projectile * M0projectile;
>> 86 G4double AveragePt2 = theParameters->GetAvaragePt2ofElasticScattering();
76 87
77 // Target parameters 88 // Target parameters
78 G4LorentzVector Ptarget = target->Get4Moment 89 G4LorentzVector Ptarget = target->Get4Momentum();
79 G4double M0target = Ptarget.mag(); 90 G4double M0target = Ptarget.mag();
80 G4double M0target2 = M0target * M0target; << 91 //if ( M0target < target->GetDefinition()->GetPDGMass() ) {
81 92
82 G4double AveragePt2 = theParameters->GetAvar << 93 G4double MminTarget=BrW.GetMinimumMass(target->GetDefinition());
>> 94
>> 95 if ( M0target < MminTarget ) {
>> 96 PutOnMassShell = true;
>> 97 M0target = target->GetDefinition()->GetPDGMass();
>> 98 }
>> 99 G4double M0target2 = M0target * M0target;
83 100
84 // Transform momenta to cms and then rotate 101 // Transform momenta to cms and then rotate parallel to z axis;
85 G4LorentzVector Psum; 102 G4LorentzVector Psum;
86 Psum = Pprojectile + Ptarget; 103 Psum = Pprojectile + Ptarget;
87 G4LorentzRotation toCms( -1*Psum.boostVector 104 G4LorentzRotation toCms( -1*Psum.boostVector() );
88 G4LorentzVector Ptmp = toCms*Pprojectile; 105 G4LorentzVector Ptmp = toCms*Pprojectile;
89 if ( Ptmp.pz() <= 0.0 ) return false; 106 if ( Ptmp.pz() <= 0.0 ) return false;
90 //"String" moving backwards in CMS, abort c 107 //"String" moving backwards in CMS, abort collision !
91 //G4cout << " abort Collision! " << G4endl; 108 //G4cout << " abort Collision! " << G4endl;
92 toCms.rotateZ( -1*Ptmp.phi() ); 109 toCms.rotateZ( -1*Ptmp.phi() );
93 toCms.rotateY( -1*Ptmp.theta() ); 110 toCms.rotateY( -1*Ptmp.theta() );
94 G4LorentzRotation toLab( toCms.inverse() ); 111 G4LorentzRotation toLab( toCms.inverse() );
95 Pprojectile.transform( toCms ); 112 Pprojectile.transform( toCms );
96 Ptarget.transform( toCms ); 113 Ptarget.transform( toCms );
97 114
>> 115 // Putting on mass-on-shell, if needed
98 G4double PZcms2, PZcms; 116 G4double PZcms2, PZcms;
99 G4double S = Psum.mag2(); 117 G4double S = Psum.mag2();
100 G4double SqrtS = std::sqrt( S ); 118 G4double SqrtS = std::sqrt( S );
101 if ( SqrtS < M0projectile + M0target ) retur 119 if ( SqrtS < M0projectile + M0target ) return false;
102 120
103 PZcms2 = ( S*S + sqr( M0projectile2 ) + sqr( 121 PZcms2 = ( S*S + sqr( M0projectile2 ) + sqr( M0target2 )
104 - 2*S*M0projectile2 - 2*S*M0targe 122 - 2*S*M0projectile2 - 2*S*M0target2 - 2*M0projectile2*M0target2 ) / 4.0 / S;
105 123
106 PZcms = ( PZcms2 > 0.0 ? std::sqrt( PZcms2 ) << 124 if ( PZcms2 < 0.0 ) { // It can be in an interaction with off-shell nuclear nucleon
>> 125 if ( M0projectile > projectile->GetDefinition()->GetPDGMass() ) {
>> 126 // An attempt to de-excite the projectile
>> 127 // It is assumed that the target is in the ground state
>> 128 M0projectile = projectile->GetDefinition()->GetPDGMass();
>> 129 M0projectile2 = M0projectile * M0projectile;
>> 130 PZcms2= ( S*S + sqr( M0projectile2 ) + sqr( M0target2 )
>> 131 - 2*S*M0projectile2 - 2*S*M0target2 - 2*M0projectile2*M0target2 ) / 4.0 / S;
>> 132 if ( PZcms2 < 0.0 ) { return false; } // Nonsuccesful attempt to de-excitate the projectile
>> 133 } else {
>> 134 return false; // The projectile was not excited, but the energy was too low to put
>> 135 // the target nucleon on mass-shell
>> 136 }
>> 137 }
>> 138
>> 139 PZcms = std::sqrt( PZcms2 );
>> 140
>> 141 if ( PutOnMassShell ) {
>> 142 if ( Pprojectile.z() > 0.0 ) {
>> 143 Pprojectile.setPz( PZcms );
>> 144 Ptarget.setPz( -PZcms );
>> 145 } else {
>> 146 Pprojectile.setPz( -PZcms );
>> 147 Ptarget.setPz( PZcms );
>> 148 };
>> 149 Pprojectile.setE( std::sqrt( M0projectile2 + Pprojectile.x() * Pprojectile.x() +
>> 150 Pprojectile.y() * Pprojectile.y() + PZcms2 ) );
>> 151 Ptarget.setE( std::sqrt( M0target2 + Ptarget.x() * Ptarget.x() + Ptarget.y() * Ptarget.y() +
>> 152 PZcms2 ) );
>> 153 }
107 154
108 G4double maxPtSquare = PZcms2; 155 G4double maxPtSquare = PZcms2;
109 156
110 // Now we can calculate the transferred Pt 157 // Now we can calculate the transferred Pt
111 G4double Pt2; 158 G4double Pt2;
112 G4double ProjMassT2, ProjMassT; 159 G4double ProjMassT2, ProjMassT;
113 G4double TargMassT2, TargMassT; 160 G4double TargMassT2, TargMassT;
114 G4LorentzVector Qmomentum; 161 G4LorentzVector Qmomentum;
115 162
116 const G4int maxNumberOfLoops = 1000; 163 const G4int maxNumberOfLoops = 1000;
117 G4int loopCounter = 0; 164 G4int loopCounter = 0;
118 do { 165 do {
119 Qmomentum = G4LorentzVector( GaussianPt( A 166 Qmomentum = G4LorentzVector( GaussianPt( AveragePt2, maxPtSquare ), 0.0 );
120 Pt2 = G4ThreeVector( Qmomentum.vect() ).ma 167 Pt2 = G4ThreeVector( Qmomentum.vect() ).mag2();
121 ProjMassT2 = M0projectile2 + Pt2; 168 ProjMassT2 = M0projectile2 + Pt2;
122 ProjMassT = std::sqrt( ProjMassT2 ); 169 ProjMassT = std::sqrt( ProjMassT2 );
123 TargMassT2 = M0target2 + Pt2; 170 TargMassT2 = M0target2 + Pt2;
124 TargMassT = std::sqrt( TargMassT2 ); 171 TargMassT = std::sqrt( TargMassT2 );
125 } while ( ( SqrtS < ProjMassT + TargMassT ) 172 } while ( ( SqrtS < ProjMassT + TargMassT ) &&
126 ++loopCounter < maxNumberOfLoops ) 173 ++loopCounter < maxNumberOfLoops ); /* Loop checking, 10.08.2015, A.Ribon */
127 if ( loopCounter >= maxNumberOfLoops ) { 174 if ( loopCounter >= maxNumberOfLoops ) {
128 return false; 175 return false;
129 } 176 }
130 177
131 PZcms2 = ( S*S + sqr( ProjMassT2 ) + sqr( Ta 178 PZcms2 = ( S*S + sqr( ProjMassT2 ) + sqr( TargMassT2 )
132 - 2.0*S*ProjMassT2 - 2.0*S*TargMa 179 - 2.0*S*ProjMassT2 - 2.0*S*TargMassT2 - 2.0*ProjMassT2*TargMassT2 ) / 4.0 / S;
133 180
134 if ( PZcms2 < 0.0 ) { PZcms2 = 0.0; }; // t 181 if ( PZcms2 < 0.0 ) { PZcms2 = 0.0; }; // to avoid the exactness problem
135 PZcms = std::sqrt( PZcms2 ); 182 PZcms = std::sqrt( PZcms2 );
136 Pprojectile.setPz( PZcms ); 183 Pprojectile.setPz( PZcms );
137 Ptarget.setPz( -PZcms ); 184 Ptarget.setPz( -PZcms );
138 Pprojectile += Qmomentum; 185 Pprojectile += Qmomentum;
139 Ptarget -= Qmomentum; 186 Ptarget -= Qmomentum;
140 187
141 // Transform back and update SplitableHadron 188 // Transform back and update SplitableHadron Participant.
142 Pprojectile.transform( toLab ); 189 Pprojectile.transform( toLab );
143 Ptarget.transform( toLab ); 190 Ptarget.transform( toLab );
144 191
145 // Calculation of the creation time 192 // Calculation of the creation time
146 projectile->SetTimeOfCreation( target->GetTi 193 projectile->SetTimeOfCreation( target->GetTimeOfCreation() );
147 projectile->SetPosition( target->GetPosition 194 projectile->SetPosition( target->GetPosition() );
148 195
149 // Creation time and position of target nucl 196 // Creation time and position of target nucleon were determined at
150 // ReggeonCascade() of G4FTFModel 197 // ReggeonCascade() of G4FTFModel
151 198
152 projectile->Set4Momentum( Pprojectile ); 199 projectile->Set4Momentum( Pprojectile );
153 target->Set4Momentum( Ptarget ); 200 target->Set4Momentum( Ptarget );
154 201
155 //projectile->IncrementCollisionCount( 1 ); 202 //projectile->IncrementCollisionCount( 1 );
156 //target->IncrementCollisionCount( 1 ); 203 //target->IncrementCollisionCount( 1 );
157 204
158 return true; 205 return true;
159 } 206 }
160 207
161 208
162 //============================================ 209 //============================================================================
163 210
164 G4ThreeVector G4ElasticHNScattering::GaussianP 211 G4ThreeVector G4ElasticHNScattering::GaussianPt( G4double AveragePt2,
165 212 G4double maxPtSquare ) const {
166 // @@ this method is used in FTFModel as wel 213 // @@ this method is used in FTFModel as well. Should go somewhere common!
167 G4double Pt2( 0.0 ); 214 G4double Pt2( 0.0 );
168 if ( AveragePt2 <= 0.0 ) { 215 if ( AveragePt2 <= 0.0 ) {
169 Pt2 = 0.0; 216 Pt2 = 0.0;
170 } else { 217 } else {
171 Pt2 = -AveragePt2 * G4Log( 1.0 + G4Uniform << 218 Pt2 = -AveragePt2 * G4Log( 1.0 + G4UniformRand() *
>> 219 ( G4Exp( -maxPtSquare/AveragePt2 ) -1.0 ) );
172 } 220 }
173 G4double Pt = ( Pt2 > 0.0 ? std::sqrt( Pt2 ) << 221 G4double Pt = std::sqrt( Pt2 );
174 G4double phi = G4UniformRand() * twopi; 222 G4double phi = G4UniformRand() * twopi;
175 return G4ThreeVector( Pt * std::cos( phi ), 223 return G4ThreeVector( Pt * std::cos( phi ), Pt * std::sin( phi ), 0.0 );
176 } 224 }
177 225
178 226
179 //============================================ 227 //============================================================================
180 228
181 G4ElasticHNScattering::G4ElasticHNScattering( 229 G4ElasticHNScattering::G4ElasticHNScattering( const G4ElasticHNScattering& ) {
182 throw G4HadronicException( __FILE__, __LINE_ 230 throw G4HadronicException( __FILE__, __LINE__,
183 "G4ElasticHNScatt << 231 "G4ElasticHNScattering copy contructor not meant to be called" );
184 } 232 }
185 233
186 234
187 //============================================ 235 //============================================================================
188 236
189 G4ElasticHNScattering::~G4ElasticHNScattering( 237 G4ElasticHNScattering::~G4ElasticHNScattering() {}
190 238
191 239
192 //============================================ 240 //============================================================================
193 241
194 const G4ElasticHNScattering & G4ElasticHNScatt 242 const G4ElasticHNScattering & G4ElasticHNScattering::operator=( const G4ElasticHNScattering& ) {
195 throw G4HadronicException( __FILE__, __LINE_ 243 throw G4HadronicException( __FILE__, __LINE__,
196 "G4ElasticHNScatt 244 "G4ElasticHNScattering = operator not meant to be called" );
197 } 245 }
198 246
199 247
200 //============================================ 248 //============================================================================
201 249
202 G4bool G4ElasticHNScattering::operator==( cons << 250 int G4ElasticHNScattering::operator==( const G4ElasticHNScattering& ) const {
203 throw G4HadronicException( __FILE__, __LINE__ 251 throw G4HadronicException( __FILE__, __LINE__,
204 "G4ElasticHNScatte 252 "G4ElasticHNScattering == operator not meant to be called" );
205 } 253 }
206 254
207 255
208 //============================================ 256 //============================================================================
209 257
210 G4bool G4ElasticHNScattering::operator!=( cons << 258 int G4ElasticHNScattering::operator!=( const G4ElasticHNScattering& ) const {
211 throw G4HadronicException( __FILE__, __LINE_ 259 throw G4HadronicException( __FILE__, __LINE__,
212 "G4ElasticHNScatte 260 "G4ElasticHNScattering != operator not meant to be called" );
213 } 261 }
214 262
215 263