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This commit is contained in:
Gabriele Cosmo
2016-06-08 15:09:25 +02:00
parent b97f8d0df7
commit aaa409b6ee
2922 changed files with 55107 additions and 81674 deletions
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source/processes/hadronic/models/generator/util/src/G4Fancy3DNucleus.cc
+167 -70
View File
@@ -5,8 +5,8 @@
// based on the Program) you indicate your acceptance of this statement,
// and all its terms.
//
// $Id: G4Fancy3DNucleus.cc,v 1.5 1998/11/19 17:10:15 gunter Exp $
// GEANT4 tag $Name: geant4-00 $
// $Id: G4Fancy3DNucleus.cc,v 1.4 1999/05/20 13:24:38 gunter Exp $
// GEANT4 tag $Name: geant4-00-01 $
//
// ------------------------------------------------------------
// GEANT 4 class implementation file
@@ -24,6 +24,7 @@
#include "G4NucleiPropertiesTable.hh"
#include "Randomize.hh"
#include "G4ios.hh"
#include "rw/tvvector.h"
G4Fancy3DNucleus::G4Fancy3DNucleus()
: nucleondistance(0.8*fermi)
@@ -91,10 +92,18 @@ void G4Fancy3DNucleus::Init(G4double theA, G4double theZ)
ChoosePositions();
// CenterNucleons();
// CenterNucleons(); // This would introduce a bias
ChooseFermiMomenta();
G4double Ebinding= BindingEnergy()/myA;
for (G4int aNucleon=0; aNucleon < myA; aNucleon++)
{
theNucleons[aNucleon].SetBindingEnergy(Ebinding);
}
return;
}
@@ -270,77 +279,165 @@ void G4Fancy3DNucleus::ChoosePositions()
void G4Fancy3DNucleus::ChooseFermiMomenta()
{
G4int i;
G4ThreeVector * momentum=new G4ThreeVector[myA];
G4ThreeVector sum,sum2;
for (G4int hardtry=0; hardtry<50; hardtry++)
{
for (G4int ntry=0; ntry<50 ; ntry ++ )
{
if ( ntry > 49 ) G4cout << "G4Nucleus: Difficulties finding nucleon momenta, number of try " << ntry<< endl;
G4int i;
G4ThreeVector * momentum=new G4ThreeVector[myA];
G4double * fermiM=new G4double[myA];
for (i=0; i < myA-1; i++ ) // momenta for all but the last nucleon
for (G4int ntry=0; ntry<1 ; ntry ++ )
{
for (i=0; i < myA; i++ ) // momenta for all, including last, in case we swa
{
fermiM[i]=theFermi.GetFermiMomentum(theDensity->GetDensity(theNucleons[i].GetPosition()));
momentum[i]= theFermi.GetMomentum(theDensity->GetDensity(theNucleons[i].GetPosition()));
sum+=momentum[i];
}
G4int best;
G4double testsum;
do
{
sum=0;
for (i=0; i < myA-1 ; i++ )
{ sum+=momentum[i]; }
// G4cout << "Momenum Sum " << sum.mag() << endl;
G4ThreeVector test;
testsum=sum.mag() * (1-perCent); // forces improvement!
if ( testsum > theFermi.GetFermiMomentum(theDensity->GetDensity(theNucleons[myA-1].GetPosition())) )
{
best=-1;
for (i=0; i < myA-1 ;i++)
{
test=-1. * sum.unit() * momentum[i].mag();
if ( (sum+test-momentum[i]).mag() < testsum )
{
best=i;
testsum=(sum+test-momentum[i]).mag();
}
if ( testsum < theFermi.GetFermiMomentum(theDensity->GetDensity(theNucleons[myA-1].GetPosition())))
{ break; }
}
if (best != -1 )
{
momentum[best]=-1.*sum.unit() * momentum[best].mag();
} else
{
G4Nucleon swap= theNucleons[ntry%(myA-1)];
theNucleons[ntry%(myA-1)]=theNucleons[myA-1];
theNucleons[myA-1]=swap;
}
}
} while ( best != -1 &&
testsum > theFermi.GetFermiMomentum(theDensity->GetDensity(theNucleons[myA-1].GetPosition())));
if ( best != -1 ) // Success
{
for (sum=0, i=0; i < myA-1 ; i++ ) sum+=momentum[i];
;
momentum[myA-1]= -1 * sum;
break;
}
}
ChoosePositions();
}
if (ReduceSum(momentum,fermiM) )
break;
// G4cout <<" G4FancyNucleus: iterating to find momenta: "<< ntry<< endl;
}
G4double energy;
for ( i=0; i< myA ; i++ )
{
energy=theNucleons[i].GetParticleType()->GetPDGMass()
+ BindingEnergy()/myA;
G4LorentzVector tempV(momentum[i],energy);
theNucleons[i].SetMomentum(tempV);
}
delete [] momentum;
// G4ThreeVector sum;
// for (G4int index=0; index<myA;sum+=momentum[index++])
// ;
// cout << "final sum / mag() " << sum << " / " << sum.mag() << endl;
G4double energy;
for ( i=0; i< myA ; i++ )
{
energy=theNucleons[i].GetParticleType()->GetPDGMass()
+ BindingEnergy()/myA;
G4LorentzVector tempV(momentum[i],energy);
theNucleons[i].SetMomentum(tempV);
}
delete [] momentum;
delete [] fermiM;
}
class G4Fancy3DNucleusHelper // Helper class
{
public:
G4Fancy3DNucleusHelper(const G4ThreeVector &vec,const G4double size,const G4int index)
: Vector(vec), Size(size), anInt(index) {}
int operator ==(const G4Fancy3DNucleusHelper &right) const
{
return this==&right;
}
int operator < (const G4Fancy3DNucleusHelper &right) const
{
return this->Size<right.Size;
}
const G4ThreeVector& vector() const
{
return Vector;
}
const G4double size() const
{
return Size;
}
const G4int index() const
{
return anInt;
}
private:
G4Fancy3DNucleusHelper operator =(const G4Fancy3DNucleusHelper &right) const
{
G4cout <<" G4Fancy3DNucleus::G4Fancy3DNucleusHelper op = called------------------" << endl;
return G4Fancy3DNucleusHelper();
}
G4Fancy3DNucleusHelper(): Vector(0), Size(0), anInt(0) {G4cout << "def ctor for MixMasch" << endl;}
const G4ThreeVector Vector;
const G4double Size;
const G4int anInt;
};
G4bool G4Fancy3DNucleus::ReduceSum(G4ThreeVector * momentum, G4double *pFermiM)
{
G4ThreeVector sum;
G4double PFermi=theFermi.GetFermiMomentum(theDensity->GetDensity(theNucleons[myA-1].GetPosition()));
for (G4int i=0; i < myA-1 ; i++ )
{ sum+=momentum[i]; }
// check if have to do anything at all..
if ( sum.mag() <= PFermi )
{
momentum[myA-1]=-sum;
return true;
}
// find all possible changes in momentum, changing only the component parallel to sum
G4ThreeVector testDir=sum.unit();
RWTPtrSortedVector<G4Fancy3DNucleusHelper> testSums(myA-1); // Sorted on delta.mag()
for ( G4int aNucleon=0; aNucleon < myA-1; aNucleon++){
G4ThreeVector delta=2*((momentum[aNucleon]*testDir)* testDir);
testSums.insert(new G4Fancy3DNucleusHelper(delta,delta.mag(),aNucleon));
}
// reduce Momentum Sum until the next would be allowed.
G4int index=testSums.entries();
while ( (sum-testSums[--index]->vector()).mag()>PFermi && index>0)
{
// Only take one which improve, ie. don't change sign and overshoot...
if ( sum.mag() > (sum-testSums[index]->vector()).mag() ) {
// momentum[testSums[index]->index()]-=testSums[index]->vector();
// sum-=testSums[index]->vector();
}
}
if ( (sum-testSums[index]->vector()).mag() <= PFermi )
{
G4int best=-1;
G4double pBest=2*PFermi; // anything larger than PFermi
for ( G4int aNucleon=0; aNucleon<=index; aNucleon++)
{
// find the momentum closest to choosen momentum for last Nucleon.
G4double pTry=(testSums[aNucleon]->vector()-sum).mag();
if ( pTry < PFermi
&& abs(momentum[myA-1].mag() - pTry ) < pBest )
{
pBest=abs(momentum[myA-1].mag() - pTry );
best=aNucleon;
}
}
if ( best < 0 ) G4Exception( " Logic error in Fancy3DNucleus");
// momentum[testSums[best]->index()]-=testSums[best]->vector();
// momentum[myA-1]=testSums[best]->vector()-sum;
testSums.clearAndDestroy();
return true;
}
testSums.clearAndDestroy();
// try to compensate momentum using another Nucleon....
G4int swapit=-1;
while (swapit< myA-1
&& theFermi.GetFermiMomentum(theDensity->GetDensity(theNucleons[++swapit].GetPosition())) < PFermi )
;
if (swapit == myA-1 ) return false;
// Now we have a nucleon with a bigger Fermi Momentum.
// Exchange with last nucleon.. and iterate.
// G4cout << " Nucleon to swap with : " << swapit << endl;
// G4cout << " Fermi momentum test, and better.. " << PFermi << " / "
// << theFermi.GetFermiMomentum(theDensity->GetDensity(theNucleons[swapit].GetPosition())) << endl;
// cout << theNucleons[swapit]<< endl << theNucleons[myA-1] << endl;
// cout << momentum[swapit] << endl << momentum[myA-1] << endl;
G4Nucleon swap= theNucleons[swapit];
G4ThreeVector mom_swap=momentum[swapit];
G4double pf=pFermiM[swapit];
theNucleons[swapit]=theNucleons[myA-1];
momentum[swapit]=momentum[myA-1];
pFermiM[swapit]=pFermiM[myA-1];
theNucleons[myA-1]=swap;
momentum[myA-1]=mom_swap;
pFermiM[myA-1]=pf;
// cout << "after swap" <<endl<< theNucleons[swapit] << endl << theNucleons[myA-1] << endl;
// cout << momentum[swapit] << endl << momentum[myA-1] << endl;
return ReduceSum(momentum,pFermiM);
}