Import Geant4 0.0.0 source tree

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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4LEPionMinusInelastic.cc,v 2.4 1998/12/14 15:33:15 hpw Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+ // Hadronic Process: PionMinus Inelastic Process
+ // J.L. Chuma, TRIUMF, 19-Nov-1996
+ // Last modified: 27-Mar-1997
+ // Modified by J.L.Chuma 30-Apr-97: added originalTarget for CalculateMomenta
+ 
+#include "G4LEPionMinusInelastic.hh"
+#include "Randomize.hh"
+ 
+ G4VParticleChange *
+  G4LEPionMinusInelastic::ApplyYourself( const G4Track &aTrack,
+                                         G4Nucleus &targetNucleus )
+  {
+    theParticleChange.Initialize( aTrack );
+    
+    const G4DynamicParticle *originalIncident = aTrack.GetDynamicParticle();
+    if (originalIncident->GetKineticEnergy()<= 0.1*MeV) return &theParticleChange;
+
+    // create the target particle
+    
+    G4DynamicParticle *originalTarget = targetNucleus.ReturnTargetParticle();
+    G4double targetMass = originalTarget->GetDefinition()->GetPDGMass();
+    G4ReactionProduct targetParticle( originalTarget->GetDefinition() );
+    
+    if( verboseLevel > 1 )
+    {
+      G4Material *targetMaterial = aTrack.GetMaterial();
+      G4cout << "G4PionMinusInelastic::ApplyYourself called" << endl;
+      G4cout << "kinetic energy = " << originalIncident->GetKineticEnergy() << "MeV, ";
+      G4cout << "target material = " << targetMaterial->GetName() << ", ";
+      G4cout << "target particle = " << originalTarget->GetDefinition()->GetParticleName()
+           << endl;
+    }
+    G4ReactionProduct currentParticle( originalIncident->GetDefinition() );
+    currentParticle.SetMomentum( originalIncident->GetMomentum() );
+    currentParticle.SetKineticEnergy( originalIncident->GetKineticEnergy() );
+    
+    // Fermi motion and evaporation
+    // As of Geant3, the Fermi energy calculation had not been Done
+    
+    G4double ek = originalIncident->GetKineticEnergy();
+    G4double amas = originalIncident->GetDefinition()->GetPDGMass();
+    
+    G4double tkin = targetNucleus.Cinema( ek );
+    ek += tkin;
+    currentParticle.SetKineticEnergy( ek );
+    G4double et = ek + amas;
+    G4double p = sqrt( abs((et-amas)*(et+amas)) );
+    G4double pp = currentParticle.GetMomentum().mag();
+    if( pp > 0.0 )
+    {
+      G4ThreeVector momentum = currentParticle.GetMomentum();
+      currentParticle.SetMomentum( momentum * (p/pp) );
+    }
+    
+    // calculate black track energies
+    
+    tkin = targetNucleus.EvaporationEffects( ek );
+    ek -= tkin;
+    currentParticle.SetKineticEnergy( ek );
+    et = ek + amas;
+    p = sqrt( abs((et-amas)*(et+amas)) );
+    pp = currentParticle.GetMomentum().mag();
+    if( pp > 0.0 )
+    {
+      G4ThreeVector momentum = currentParticle.GetMomentum();
+      currentParticle.SetMomentum( momentum * (p/pp) );
+    }
+
+    G4ReactionProduct modifiedOriginal = currentParticle;
+
+    currentParticle.SetSide( 1 ); // incident always goes in forward hemisphere
+    targetParticle.SetSide( -1 );  // target always goes in backward hemisphere
+    G4bool incidentHasChanged = false;
+    G4bool targetHasChanged = false;
+    G4bool quasiElastic = false;
+    G4FastVector<G4ReactionProduct,128> vec;  // vec will contain the secondary particles
+    G4int vecLen = 0;
+    vec.Initialize( 0 );
+    
+    const G4double cutOff = 0.1*MeV;
+    if( currentParticle.GetKineticEnergy() > cutOff )
+      Cascade( vec, vecLen,
+               originalIncident, currentParticle, targetParticle,
+               incidentHasChanged, targetHasChanged, quasiElastic );
+    
+    CalculateMomenta( vec, vecLen,
+                      originalIncident, originalTarget, modifiedOriginal,
+                      targetNucleus, currentParticle, targetParticle,
+                      incidentHasChanged, targetHasChanged, quasiElastic );
+    
+    SetUpChange( vec, vecLen,
+                 currentParticle, targetParticle,
+                 incidentHasChanged );
+    
+    delete originalTarget;
+    return &theParticleChange;
+  }
+ 
+ void
+  G4LEPionMinusInelastic::Cascade(
+   G4FastVector<G4ReactionProduct,128> &vec,
+   G4int& vecLen,
+   const G4DynamicParticle *originalIncident,
+   G4ReactionProduct &currentParticle,
+   G4ReactionProduct &targetParticle,
+   G4bool &incidentHasChanged,
+   G4bool &targetHasChanged,
+   G4bool &quasiElastic )
+  {
+    // derived from original FORTRAN code CASPIM by H. Fesefeldt (13-Sep-1987)
+    //
+    // pi-  undergoes interaction with nucleon within nucleus.
+    // Check if energetically possible to produce pions/kaons.
+    // If not assume nuclear excitation occurs and input particle
+    // is degraded in energy.  No other particles produced.
+    // If reaction is possible find correct number of pions/protons/neutrons
+    // produced using an interpolation to multiplicity data.
+    // Replace some pions or protons/neutrons by kaons or strange baryons
+    // according to average multiplicity per inelastic reactions.
+    //
+    const G4double mOriginal = originalIncident->GetDefinition()->GetPDGMass();
+    const G4double etOriginal = originalIncident->GetTotalEnergy();
+    const G4double pOriginal = originalIncident->GetTotalMomentum();
+    const G4double targetMass = targetParticle.GetMass();
+    G4double centerofmassEnergy = sqrt( mOriginal*mOriginal +
+                                        targetMass*targetMass +
+                                        2.0*targetMass*etOriginal );
+    G4double availableEnergy = centerofmassEnergy-(targetMass+mOriginal);
+    if( availableEnergy <= G4PionMinus::PionMinus()->GetPDGMass() )
+    {
+      quasiElastic = true;
+      return;
+    }
+    static G4bool first = true;
+    const G4int numMul = 1200;
+    const G4int numSec = 60;
+    static G4double protmul[numMul], protnorm[numSec]; // proton constants
+    static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants
+    // np = number of pi+, nm = number of pi-, nz = number of pi0
+    G4int counter, nt=0, np=0, nm=0, nz=0;
+    const G4double c = 1.25;
+    const G4double b[] = { 0.70, 0.70 };
+    if( first )       // compute normalization constants, this will only be Done once
+    {
+      first = false;
+      G4int i;
+      for( i=0; i<numMul; ++i )protmul[i] = 0.0;
+      for( i=0; i<numSec; ++i )protnorm[i] = 0.0;
+      counter = -1;
+      for( np=0; np<(numSec/3); ++np )
+      {
+        for( nm=max(0,np-1); nm<=(np+1); ++nm )
+        {
+          for( nz=0; nz<numSec/3; ++nz )
+          {
+            if( ++counter < numMul )
+            {
+              nt = np+nm+nz;
+              if( nt > 0 )
+              {
+                protmul[counter] = Pmltpc(np,nm,nz,nt,b[0],c);
+                protnorm[nt-1] += protmul[counter];
+              }
+            }
+          }
+        }
+      }
+      for( i=0; i<numMul; ++i )neutmul[i] = 0.0;
+      for( i=0; i<numSec; ++i )neutnorm[i] = 0.0;
+      counter = -1;
+      for( np=0; np<numSec/3; ++np )
+      {
+        for( nm=np; nm<=(np+2); ++nm )
+        {
+          for( nz=0; nz<numSec/3; ++nz )
+          {
+            if( ++counter < numMul )
+            {
+              nt = np+nm+nz;
+              if( (nt>0) && (nt<=numSec) )
+              {
+                neutmul[counter] = Pmltpc(np,nm,nz,nt,b[1],c);
+                neutnorm[nt-1] += neutmul[counter];
+              }
+            }
+          }
+        }
+      }
+      for( i=0; i<numSec; ++i )
+      {
+        if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i];
+        if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i];
+      }
+    }   // end of initialization
+    
+    const G4double expxu = 82.;           // upper bound for arg. of exp
+    const G4double expxl = -expxu;        // lower bound for arg. of exp
+    G4ParticleDefinition *aNeutron = G4Neutron::Neutron();
+    G4ParticleDefinition *aProton = G4Proton::Proton();
+    G4ParticleDefinition *aPiZero = G4PionZero::PionZero();
+    G4int ieab = availableEnergy*5.0/GeV;
+    const G4double supp[] = {0.,0.4,0.55,0.65,0.75,0.82,0.86,0.90,0.94,0.98};
+    G4double test, w0, wp, wt, wm;
+    if( (availableEnergy<2.0*GeV) && (G4UniformRand()>=supp[ieab]) )
+    {
+      // suppress high multiplicity events at low momentum
+      // only one pion will be produced
+      
+      // charge exchange reaction is included in inelastic cross section
+        
+      const G4double cech[] = {1.,0.95,0.79,0.32,0.19,0.16,0.14,0.12,0.10,0.08};
+      G4int iplab = min( 9.0, pOriginal/GeV*5.0 );
+      if( G4UniformRand() <= cech[iplab] )
+      {
+        if( targetParticle.GetDefinition() == aProton )
+        {
+          currentParticle.SetDefinitionAndUpdateE( aPiZero );  // charge exchange
+          targetParticle.SetDefinitionAndUpdateE( aNeutron );
+          incidentHasChanged = true;
+          targetHasChanged = true;
+        }
+        else quasiElastic = true;
+        return;
+      }
+      nm = np = nz = 0;
+      if( targetParticle.GetDefinition() == aProton )
+      {
+        test = exp( min( expxu, max( expxl, -(1.0+b[0])*(1.0+b[0])/(2.0*c*c) ) ) );
+        w0 = test;
+        wp = 10.0*test;        
+        test = exp( min( expxu, max( expxl, -(-1.0+b[0])*(-1.0+b[0])/(2.0*c*c) ) ) );
+        wm = test;
+        wt = w0+wp+wm;
+        wp += w0;
+        G4double ran = G4UniformRand();
+        if( ran < w0/wt )
+          nz = 1;
+        else if( ran < wp/wt )
+          np = 1;
+        else
+          nm = 1;
+      }
+      else  // target is a neutron
+      {
+        test = exp( min( expxu, max( expxl, -(1.0+b[1])*(1.0+b[1])/(2.0*c*c) ) ) );
+        w0 = test;
+        test = exp( min( expxu, max( expxl, -(-1.0+b[1])*(-1.0+b[1])/(2.0*c*c) ) ) );
+        wm = test;
+        G4double ran = G4UniformRand();
+        if( ran < w0/(w0+wm) )
+          nz = 1;
+        else
+          nm = 1;
+      }
+    }
+    else
+    {
+      G4double n, anpn;
+      GetNormalizationConstant( availableEnergy, n, anpn );
+      G4double ran = G4UniformRand();
+      G4double dum, excs = 0.0;
+      if( targetParticle.GetDefinition() == aProton )
+      {
+        counter = -1;
+        for( np=0; (np<numSec/3) && (ran>=excs); ++np )
+        {
+          for( nm=max(0,np-1); (nm<=(np+1)) && (ran>=excs); ++nm )
+          {
+            for( nz=0; (nz<numSec/3) && (ran>=excs); ++nz )
+            {
+              if( ++counter < numMul )
+              {
+                nt = np+nm+nz;
+                if( nt > 0 )
+                {
+                  test = exp( min( expxu, max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
+                  dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n);
+                  if( fabs(dum) < 1.0 )
+                  {
+                    if( test >= 1.0e-10 )excs += dum*test;
+                  }
+                  else
+                    excs += dum*test;
+                }
+              }
+            }
+          }
+        }
+        if( ran >= excs )  // 3 previous loops continued to the end
+        {
+          quasiElastic = true;
+          return;
+        }
+        np--; nm--; nz--;
+      }
+      else  // target must be a neutron
+      {
+        counter = -1;
+        for( np=0; (np<numSec/3) && (ran>=excs); ++np )
+        {
+          for( nm=np; (nm<=(np+2)) && (ran>=excs); ++nm )
+          {
+            for( nz=0; (nz<numSec/3) && (ran>=excs); ++nz )
+            {
+              if( ++counter < numMul )
+              {
+                nt = np+nm+nz;
+                if( (nt>=1) && (nt<=numSec) )
+                {
+                  test = exp( min( expxu, max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
+                  dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n);
+                  if( fabs(dum) < 1.0 )
+                  {
+                    if( test >= 1.0e-10 )excs += dum*test;
+                  }
+                  else
+                    excs += dum*test;
+                }
+              }
+            }
+          }
+        }
+        if( ran >= excs )  // 3 previous loops continued to the end
+        {
+          quasiElastic = true;
+          return;
+        }
+        np--; nm--; nz--;
+      }
+    }
+    if( targetParticle.GetDefinition() == aProton )
+    {
+      switch( np-nm )
+      {
+       case 0:
+         if( G4UniformRand() >= 0.75 )
+         {
+           currentParticle.SetDefinitionAndUpdateE( aPiZero );
+           targetParticle.SetDefinitionAndUpdateE( aNeutron );
+           incidentHasChanged = true;
+           targetHasChanged = true;
+         }
+         break;
+       case 1:
+         targetParticle.SetDefinitionAndUpdateE( aNeutron );
+         targetHasChanged = true;
+         break;
+       default:
+         currentParticle.SetDefinitionAndUpdateE( aPiZero );
+         incidentHasChanged = true;
+         break;
+      }
+    }
+    else
+    {
+      switch( np-nm )
+      {
+       case -1:
+         if( G4UniformRand() < 0.5 )
+         {
+           targetParticle.SetDefinitionAndUpdateE( aProton );
+           targetHasChanged = true;
+         } else {
+           currentParticle.SetDefinitionAndUpdateE( aPiZero );
+           incidentHasChanged = true;
+         }
+         break;
+       case 0:
+         break;
+       default:
+         currentParticle.SetDefinitionAndUpdateE( aPiZero );
+         incidentHasChanged = true;
+         break;
+      }
+    }
+    SetUpPions( np, nm, nz, vec, vecLen );
+    return;
+  }
+
+ /* end of file */
+