Import Geant4 0.0.0 source tree
This commit is contained in:
Gabriele Cosmo
@@ -0,0 +1,894 @@
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// This code implementation is the intellectual property of
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// the RD44 GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4IeplusAnnihilation.cc,v 2.8 1998/12/09 09:15:20 urban Exp $
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// GEANT4 tag $Name: geant4-00 $
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//
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// $Id:
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// --------------------------------------------------------------
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// GEANT 4 class implementation file
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// CERN Geneva Switzerland
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//
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// For information related to this code contact:
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// CERN, IT Division, ASD group
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// History: first implementation, based on object model of
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// 2nd December 1995, G.Cosmo
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// ------------ G4IeplusAnnihilation process --------
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// by Michel Maire, 7 July 1996
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// **************************************************************
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// --------------------------------------------------------------
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// ************************************************************
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// It is the first implementation of the
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// eplusANNIHILATION PROCESS
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// using an INTEGRAL APPROACH instead of the differential
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// one used in the standard implementation .
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// ************************************************************
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// by Laszlo Urban, 23 June 1998
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// -----------------------------------------------------------
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// 28/10/28: some cleanup , L.Urban
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#include "G4IeplusAnnihilation.hh"
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#include "G4UnitsTable.hh"
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// constructor
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G4IeplusAnnihilation::G4IeplusAnnihilation(const G4String& processName)
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: G4IVRestDiscreteProcess (processName),
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LowestEnergyLimit ( 10*keV), // initialization
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HighestEnergyLimit( 10*TeV),
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NumberOfBuildPhysicsTableCalls(0),
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NumbBinTable(100)
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{
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if (verboseLevel>0) {
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G4cout << GetProcessName() << " is created "<< endl;
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G4cout << "LowestEnergy: " << LowestEnergyLimit/keV << "keV ";
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G4cout << "HighestEnergy: " << HighestEnergyLimit/TeV << "TeV " << endl;
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}
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theCrossSectionTable = NULL;
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theMeanFreePathTable = NULL;
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theMeanFreePathTable = NULL ;
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theNlambdaTable = NULL;
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theInverseNlambdaTable = NULL;
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theCoeffATable = NULL ;
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theCoeffBTable = NULL ;
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theCoeffCTable = NULL ;
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LowestKineticEnergy = LowestEnergyLimit ;
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HighestKineticEnergy= HighestEnergyLimit;
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TotBin = NumbBinTable ;
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RTable = exp(log(HighestKineticEnergy/LowestKineticEnergy)/TotBin) ;
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}
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// destructor
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G4IeplusAnnihilation::~G4IeplusAnnihilation()
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{
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if (theCrossSectionTable) {
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theCrossSectionTable->clearAndDestroy();
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delete theCrossSectionTable;
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}
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if (theMeanFreePathTable) {
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theMeanFreePathTable->clearAndDestroy();
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delete theMeanFreePathTable;
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}
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if (theMeanFreePathTable) {
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theMeanFreePathTable->clearAndDestroy();
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delete theMeanFreePathTable;
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}
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if (theNlambdaTable) {
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theNlambdaTable->clearAndDestroy();
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delete theNlambdaTable;
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}
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if (theInverseNlambdaTable) {
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theInverseNlambdaTable->clearAndDestroy();
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delete theInverseNlambdaTable;
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}
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if (theCoeffATable) {
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theCoeffATable->clearAndDestroy();
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delete theCoeffATable;
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}
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if (theCoeffBTable) {
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theCoeffBTable->clearAndDestroy();
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delete theCoeffBTable;
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}
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if (theCoeffCTable) {
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theCoeffCTable->clearAndDestroy();
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delete theCoeffCTable;
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}
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}
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void G4IeplusAnnihilation::SetPhysicsTableBining(G4double lowE,
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G4double highE, G4int nBins)
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{
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LowestEnergyLimit = lowE; HighestEnergyLimit = highE; NumbBinTable = nBins;
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}
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void G4IeplusAnnihilation::BuildPhysicsTable(const G4ParticleDefinition& PositronType)
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// Build microscopic total cross section tables and mean free path table
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{
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NumberOfBuildPhysicsTableCalls += 1 ;
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if(NumberOfBuildPhysicsTableCalls == 1)
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{ ; }
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else
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{
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G4double LowEdgeEnergy, Value;
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G4PhysicsLogVector* ptrVector;
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// Build microscopic cross section tables for the e+e- annihilation
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if (theCrossSectionTable) {
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theCrossSectionTable->clearAndDestroy(); delete theCrossSectionTable; }
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theCrossSectionTable = new G4PhysicsTable( G4Element::GetNumberOfElements()) ;
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const G4ElementTable* theElementTable = G4Element::GetElementTable() ;
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G4double AtomicNumber;
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G4int J;
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for ( J=0 ; J < G4Element::GetNumberOfElements(); J++ )
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{
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//create physics vector then fill it ....
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ptrVector = new G4PhysicsLogVector(LowestEnergyLimit, HighestEnergyLimit,
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NumbBinTable ) ;
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AtomicNumber = (*theElementTable)(J)->GetZ();
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for ( G4int i = 0 ; i < NumbBinTable ; i++ )
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{
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LowEdgeEnergy = ptrVector->GetLowEdgeEnergy( i ) ;
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Value = ComputeMicroscopicCrossSection( LowEdgeEnergy, AtomicNumber);
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ptrVector->PutValue( i , Value ) ;
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}
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theCrossSectionTable->insertAt( J , ptrVector ) ;
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}
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// Build mean free path table for the e+e- annihilation
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if (theMeanFreePathTable) {
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theMeanFreePathTable->clearAndDestroy(); delete theMeanFreePathTable; }
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theMeanFreePathTable = new G4PhysicsTable( G4Material::GetNumberOfMaterials() );
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//*******************!!!!!!!!!!!!!!!!!!!!!!********************
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theMeanFreePathTable = theMeanFreePathTable ;
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//*******************!!!!!!!!!!!!!!!!!!!!!!********************
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const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable() ;
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G4Material* material;
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for ( J=0 ; J < G4Material::GetNumberOfMaterials(); J++ )
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{
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//create physics vector then fill it ....
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ptrVector = new G4PhysicsLogVector(LowestEnergyLimit, HighestEnergyLimit,
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NumbBinTable ) ;
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material = (*theMaterialTable)(J);
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for ( G4int i = 0 ; i < NumbBinTable ; i++ )
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{
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LowEdgeEnergy = ptrVector->GetLowEdgeEnergy( i ) ;
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Value = ComputeMeanFreePath( LowEdgeEnergy, material);
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ptrVector->PutValue( i , Value ) ;
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}
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theMeanFreePathTable->insertAt( J , ptrVector ) ;
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}
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const G4ParticleDefinition& aParticleType = PositronType ;
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BuildNlambdaTable(aParticleType) ;
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BuildCoeffATable(aParticleType) ;
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BuildCoeffBTable(aParticleType) ;
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BuildCoeffCTable(aParticleType) ;
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BuildInverseNlambdaTable(aParticleType) ;
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G4int printflag = 0 ;
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if(printflag>0)
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TestOfInversion(aParticleType,printflag) ;
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NumberOfBuildPhysicsTableCalls = 0 ;
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PrintInfoDefinition() ;
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}
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}
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void G4IeplusAnnihilation::TestOfInversion(
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const G4ParticleDefinition& aParticleType,
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G4int printflag)
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{
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G4double T,Nlambda,Tprime,delta,del,sum,delmean,Tdelta ;
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G4bool isOut ;
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const G4MaterialTable* theMaterialTable=
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G4Material::GetMaterialTable();
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G4int numOfMaterials = theMaterialTable->length() ;
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G4cout.setf(ios::scientific, ios::floatfield) ;
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if(printflag>1)
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{
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G4cout << endl;
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G4cout << " particle=" << aParticleType.GetParticleName() << endl;
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G4cout << "----------------------" << endl;
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}
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for (G4int J=0; J<numOfMaterials; J++)
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{
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if(printflag>1)
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{
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G4cout << endl;
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G4cout << " material = " << (*theMaterialTable)[J]->GetName() << endl;
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G4cout << " mat.ind.=" << J << " T Nlambda Tprime"
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<< " (Tprime-T)/T(%)" << endl ;
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}
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G4PhysicsLogVector* aVector ;
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aVector = new G4PhysicsLogVector(LowestKineticEnergy,
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HighestKineticEnergy,TotBin) ;
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delta = 0. ;
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delmean = 0.;
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sum = 0.;
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Tdelta = 0. ;
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for (G4int i=0; i<TotBin-1; i++)
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{
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T = aVector->GetLowEdgeEnergy(i) ;
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Nlambda = (*theNlambdaTable)[J]->GetValue(T,isOut) ;
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if(Nlambda>0.)
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{
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Tprime = (*theInverseNlambdaTable)[J]->GetValue(Nlambda,isOut) ;
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if((Nlambda>0.)&&(i<(TotBin-1)))
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{
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del = 100.*(Tprime-T)/T ;
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sum += 1.;
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delmean += abs(del);
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if(abs(del)>abs(delta))
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{
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delta = del ;
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Tdelta = T ;
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}
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}
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if(printflag>1)
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{
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G4cout << setw(18) << setprecision(6) << T << " " <<
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setw(14)<< setprecision(6) << Nlambda << " " <<
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setw(14) << setprecision(6) << Tprime << " " <<
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setw(12) << setprecision(3) << del << endl;
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// setw(12) << setprecision(3) << del ;
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}
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}
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}
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if(printflag>0)
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{
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G4cout << endl;
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G4cout << "G4IeplusAnnihilation::TestOfInversion (T->Nlambda->Tprime) " << endl
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;
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G4cout << "particle= " << aParticleType.GetParticleName() <<
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" material= " << (*theMaterialTable)[J]->GetName() << endl ;
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G4cout << "max (Tprime-T)/T in % =" << setw(10) << setprecision(3) << delta ;
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G4cout << " at a kinetic energy " << setw(10) << setprecision(3) <<
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Tdelta/MeV << " MeV" << endl;
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delmean /= sum ;
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G4cout << "mean rel.diff. (Tprime-T)/T=" << setw(10) <<
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setprecision(3) << delmean <<
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" % (mean is calculated in abs. value)" << endl;
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G4cout << endl;
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}
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}
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}
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void G4IeplusAnnihilation::BuildNlambdaTable(
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const G4ParticleDefinition& aParticleType)
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{
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const G4MaterialTable* theMaterialTable=
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G4Material::GetMaterialTable();
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G4int numOfMaterials = theMaterialTable->length() ;
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if(theNlambdaTable)
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{ theNlambdaTable->clearAndDestroy();
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delete theNlambdaTable ; }
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theNlambdaTable = new G4PhysicsTable(numOfMaterials) ;
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// loop for materials
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for (G4int J=0; J<numOfMaterials; J++)
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{
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G4PhysicsLogVector* aVector ;
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aVector = new G4PhysicsLogVector(LowestKineticEnergy,
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HighestKineticEnergy,TotBin) ;
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BuildNlambdaVector(aParticleType,J,aVector) ;
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theNlambdaTable->insert(aVector) ;
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}
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}
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void G4IeplusAnnihilation::BuildNlambdaVector(
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const G4ParticleDefinition& aParticleType,
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G4int materialIndex,
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G4PhysicsLogVector* nlambdaVector)
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{
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G4double LowEdgeEnergy,T,Tlast,dEdx,Value,Vlast,u,du,coeff ;
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const G4int nbin = 100 ;
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G4bool isOut ;
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const G4double small = 1.e-100;
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const G4double plowloss = 0.5 ; //this should be a data member of en.loss!
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const G4MaterialTable* theMaterialTable=
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G4Material::GetMaterialTable();
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//first integral from 0. to LowestKineticEnergy
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// here assumed that the threshold energy for the process >=
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// LowestKineticEnergy
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dEdx = G4EnergyLossTables::GetPreciseDEDX(&aParticleType,
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LowestKineticEnergy,
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(*theMaterialTable)[materialIndex]);
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Value = LowestKineticEnergy/(dEdx*BIGSTEP*(1.-plowloss)) ;
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if(Value<small)
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Value = 0. ;
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nlambdaVector->PutValue(0,Value) ;
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Tlast = LowestKineticEnergy ;
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Vlast = Value ;
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// loop for kinetic energy
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for (G4int i=1; i<TotBin; i++)
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{
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LowEdgeEnergy = nlambdaVector->GetLowEdgeEnergy(i) ;
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u = log(LowEdgeEnergy/Tlast) ;
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du = u/nbin ;
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u = -du ;
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Value = 0. ;
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for(G4int n=0; n<=nbin; n++)
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{
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u += du ;
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T = Tlast*exp(u) ;
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if((n==0)||(n==nbin))
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coeff=0.5 ;
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else
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coeff=1.0 ;
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Value += coeff*T/(G4EnergyLossTables::GetPreciseDEDX(&aParticleType,
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T,(*theMaterialTable)[materialIndex])*
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(*theMeanFreePathTable)[materialIndex]->GetValue(T,isOut));
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}
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Value *= du ;
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Value += Vlast ;
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if(Value<small)
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Value = 0. ;
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nlambdaVector->PutValue(i,Value) ;
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Tlast = LowEdgeEnergy ;
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Vlast = Value ;
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}
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}
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void G4IeplusAnnihilation::BuildCoeffATable(
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const G4ParticleDefinition& aParticleType)
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{
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const G4MaterialTable* theMaterialTable=
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G4Material::GetMaterialTable();
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// create table for coefficients "A"
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G4int numOfMaterials = theMaterialTable->length();
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if(theCoeffATable)
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{ theCoeffATable->clearAndDestroy();
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delete theCoeffATable; }
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theCoeffATable = new G4PhysicsTable(numOfMaterials);
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G4double R2 = RTable*RTable ;
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G4double R1 = RTable+1.;
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G4double w = R1*(RTable-1.)*(RTable-1.);
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G4double w1 = RTable/w , w2 = -RTable*R1/w , w3 = R2/w ;
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G4double Ti , Tim , Tip , Ri , Rim , Rip , Value ;
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G4bool isOut;
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// loop for materials
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for (G4int J=0; J<numOfMaterials; J++)
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{
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// create vector
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G4int binmax=TotBin ;
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G4PhysicsLinearVector* aVector =
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new G4PhysicsLinearVector(0.,binmax, TotBin);
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// loop for kinetic energy
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Ti = LowestKineticEnergy ;
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G4PhysicsVector* lVector= (*theNlambdaTable)[J];
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for ( G4int i=0; i<TotBin; i++)
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{
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Ri = lVector->GetValue(Ti,isOut) ;
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if ( i==0 )
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Rim = Ri/sqrt(RTable) ;
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else
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{
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Tim = Ti/RTable ;
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Rim = lVector->GetValue(Tim,isOut);
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}
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Tip = Ti*RTable ;
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Rip = lVector->GetValue(Tip,isOut);
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if( i < (TotBin-1))
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Value = (w1*Rip + w2*Ri + w3*Rim)/(Ti*Ti) ;
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else
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{
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Rip = Rip*Rip/Rim ;
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Value = (w1*Rip + w2*Ri + w3*Rim)/(Ti*Ti) ;
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}
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aVector->PutValue(i,Value);
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Ti = RTable*Ti ;
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}
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theCoeffATable->insert(aVector);
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}
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}
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void G4IeplusAnnihilation::BuildCoeffBTable(
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const G4ParticleDefinition& aParticleType)
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{
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const G4MaterialTable* theMaterialTable=
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G4Material::GetMaterialTable();
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// create table for coefficients "B"
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G4int numOfMaterials = theMaterialTable->length();
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if(theCoeffBTable)
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{ theCoeffBTable->clearAndDestroy();
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delete theCoeffBTable; }
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theCoeffBTable = new G4PhysicsTable(numOfMaterials);
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G4double R2 = RTable*RTable ;
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G4double R1 = RTable+1.;
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G4double w = R1*(RTable-1.)*(RTable-1.);
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G4double w1 = -R1/w , w2 = R1*(R2+1.)/w , w3 = -R2*R1/w ;
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G4double Ti , Tim , Tip , Ri , Rim , Rip , Value ;
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G4bool isOut;
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// loop for materials
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for (G4int J=0; J<numOfMaterials; J++)
|
||||
{
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||||
|
||||
// create vector
|
||||
G4int binmax=TotBin ;
|
||||
G4PhysicsLinearVector* aVector =
|
||||
new G4PhysicsLinearVector(0.,binmax, TotBin);
|
||||
|
||||
// loop for kinetic energy
|
||||
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Ti = LowestKineticEnergy ;
|
||||
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||||
G4PhysicsVector* lVector= (*theNlambdaTable)[J];
|
||||
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||||
for ( G4int i=0; i<TotBin; i++)
|
||||
{
|
||||
Ri = lVector->GetValue(Ti,isOut) ;
|
||||
|
||||
if ( i==0 )
|
||||
Rim = Ri/sqrt(RTable) ;
|
||||
else
|
||||
{
|
||||
Tim = Ti/RTable ;
|
||||
Rim = lVector->GetValue(Tim,isOut);
|
||||
}
|
||||
|
||||
Tip = Ti*RTable ;
|
||||
Rip = lVector->GetValue(Tip,isOut);
|
||||
|
||||
if(i < (TotBin-1))
|
||||
Value = (w1*Rip + w2*Ri + w3*Rim)/Ti;
|
||||
else
|
||||
{
|
||||
Rip = Rip*Rip/Rim ;
|
||||
Value = (w1*Rip + w2*Ri + w3*Rim)/Ti ;
|
||||
}
|
||||
|
||||
aVector->PutValue(i,Value);
|
||||
|
||||
Ti = RTable*Ti ;
|
||||
|
||||
}
|
||||
|
||||
theCoeffBTable->insert(aVector);
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
void G4IeplusAnnihilation::BuildCoeffCTable(
|
||||
const G4ParticleDefinition& aParticleType)
|
||||
{
|
||||
const G4MaterialTable* theMaterialTable=
|
||||
G4Material::GetMaterialTable();
|
||||
|
||||
// create table for coefficients "C"
|
||||
|
||||
G4int numOfMaterials = theMaterialTable->length();
|
||||
|
||||
if(theCoeffCTable)
|
||||
{ theCoeffCTable->clearAndDestroy();
|
||||
delete theCoeffCTable; }
|
||||
theCoeffCTable = new G4PhysicsTable(numOfMaterials);
|
||||
|
||||
G4double R2 = RTable*RTable ;
|
||||
G4double R1 = RTable+1.;
|
||||
G4double w = R1*(RTable-1.)*(RTable-1.);
|
||||
G4double w1 = 1./w , w2 = -RTable*R1/w , w3 = RTable*R2/w ;
|
||||
G4double Ti , Tim , Tip , Ri , Rim , Rip , Value ;
|
||||
G4bool isOut;
|
||||
|
||||
// loop for materials
|
||||
for (G4int J=0; J<numOfMaterials; J++)
|
||||
{
|
||||
|
||||
// create vector
|
||||
G4int binmax=TotBin ;
|
||||
G4PhysicsLinearVector* aVector =
|
||||
new G4PhysicsLinearVector(0.,binmax, TotBin);
|
||||
|
||||
// loop for kinetic energy
|
||||
|
||||
Ti = LowestKineticEnergy ;
|
||||
|
||||
G4PhysicsVector* lVector= (*theNlambdaTable)[J];
|
||||
|
||||
for ( G4int i=0; i<TotBin; i++)
|
||||
{
|
||||
Ri = lVector->GetValue(Ti,isOut) ;
|
||||
|
||||
if ( i==0 )
|
||||
Rim = Ri/sqrt(RTable) ;
|
||||
else
|
||||
{
|
||||
Tim = Ti/RTable ;
|
||||
Rim = lVector->GetValue(Tim,isOut);
|
||||
}
|
||||
|
||||
Tip = Ti*RTable ;
|
||||
Rip = lVector->GetValue(Tip,isOut);
|
||||
|
||||
if(i < (TotBin-1))
|
||||
Value = w1*Rip + w2*Ri + w3*Rim ;
|
||||
else
|
||||
{
|
||||
Rip = Rip*Rip/Rim ;
|
||||
Value = w1*Rip + w2*Ri + w3*Rim ;
|
||||
}
|
||||
|
||||
|
||||
aVector->PutValue(i,Value);
|
||||
|
||||
Ti = RTable*Ti ;
|
||||
|
||||
}
|
||||
|
||||
theCoeffCTable->insert(aVector);
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
void G4IeplusAnnihilation::BuildInverseNlambdaTable(
|
||||
const G4ParticleDefinition& aParticleType)
|
||||
{
|
||||
G4double T,Smallest,Biggest,TT ;
|
||||
const G4double small = 1.e-10;
|
||||
G4bool isOut ;
|
||||
|
||||
// create table
|
||||
|
||||
const G4MaterialTable* theMaterialTable=
|
||||
G4Material::GetMaterialTable();
|
||||
|
||||
G4int numOfMaterials = theMaterialTable->length();
|
||||
|
||||
if(theInverseNlambdaTable)
|
||||
{ theInverseNlambdaTable->clearAndDestroy();
|
||||
delete theInverseNlambdaTable; }
|
||||
theInverseNlambdaTable = new G4PhysicsTable(numOfMaterials);
|
||||
|
||||
// loop for materials
|
||||
|
||||
for (G4int J=0; J<numOfMaterials; J++)
|
||||
{
|
||||
T = LowestKineticEnergy ;
|
||||
do
|
||||
{
|
||||
Smallest = (*theNlambdaTable)[J]->
|
||||
GetValue(T,isOut) ;
|
||||
T *= RTable ;
|
||||
} while (Smallest <= small) ;
|
||||
|
||||
Biggest = (*theNlambdaTable)[J]->
|
||||
GetValue(HighestKineticEnergy,isOut) ;
|
||||
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
|
||||
Biggest *= 1.25 ;
|
||||
|
||||
// create vector
|
||||
G4PhysicsLogVector* aVector;
|
||||
|
||||
aVector = new G4PhysicsLogVector(Smallest,
|
||||
Biggest,TotBin);
|
||||
|
||||
// fill the vector
|
||||
|
||||
InvertNlambdaVector(aParticleType,J, aVector);
|
||||
|
||||
// insert vector to the table
|
||||
|
||||
theInverseNlambdaTable->insert(aVector);
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
void G4IeplusAnnihilation::InvertNlambdaVector(
|
||||
const G4ParticleDefinition& aParticleType,
|
||||
G4int materialIndex,
|
||||
G4PhysicsLogVector* nlambdaVector)
|
||||
{
|
||||
G4double LowEdge,A,B,C,discr,KineticEnergy ;
|
||||
G4double Tbin = LowestKineticEnergy/RTable ;
|
||||
G4double bin = 0.0 ;
|
||||
G4int binnumber = -1 ;
|
||||
G4bool isOut ;
|
||||
|
||||
//loop for Nlambda values
|
||||
for( G4int i=0; i<TotBin; i++)
|
||||
{
|
||||
LowEdge = nlambdaVector->GetLowEdgeEnergy(i) ; //i.e. GetLowEdgeValue(i)
|
||||
|
||||
if( bin < LowEdge )
|
||||
{
|
||||
do
|
||||
{
|
||||
binnumber += 1 ;
|
||||
Tbin *= RTable ;
|
||||
bin = (*theNlambdaTable)[materialIndex]->GetValue(Tbin,isOut) ;
|
||||
}
|
||||
while ((bin < LowEdge) && (binnumber < TotBin-2 )) ;
|
||||
}
|
||||
|
||||
if(binnumber == 0)
|
||||
KineticEnergy = LowestKineticEnergy ;
|
||||
else if(binnumber == TotBin-1)
|
||||
KineticEnergy = HighestKineticEnergy ;
|
||||
else
|
||||
{
|
||||
A = (*(*theCoeffATable)(materialIndex))(binnumber-1) ;
|
||||
B = (*(*theCoeffBTable)(materialIndex))(binnumber-1) ;
|
||||
C = (*(*theCoeffCTable)(materialIndex))(binnumber-1) ;
|
||||
if(A==0.)
|
||||
KineticEnergy = (LowEdge -C )/B ;
|
||||
else
|
||||
{
|
||||
discr = B*B - 4.*A*(C-LowEdge);
|
||||
discr = discr>0. ? sqrt(discr) : 0.;
|
||||
KineticEnergy = 0.5*(discr-B)/A ;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
nlambdaVector->PutValue(i,KineticEnergy) ;
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
G4double G4IeplusAnnihilation::ComputeMicroscopicCrossSection
|
||||
(G4double PositKinEnergy, G4double AtomicNumber)
|
||||
|
||||
// Calculates the microscopic cross section of annihilation into two photons
|
||||
// from the Heilter formula.
|
||||
// GEANT4 internal units.
|
||||
|
||||
{
|
||||
static const G4double pi_rcl2 = pi*classic_electr_radius*classic_electr_radius;
|
||||
|
||||
G4double gama = 1. + PositKinEnergy/electron_mass_c2;
|
||||
G4double gama2 = gama*gama, sqgama2 = sqrt(gama2-1.);
|
||||
|
||||
return pi_rcl2*AtomicNumber*((gama2+4*gama+1.)*log(gama+sqgama2) - (gama+3.)*sqgama2)
|
||||
/((gama2-1.)*(gama+1.));
|
||||
}
|
||||
|
||||
|
||||
G4VParticleChange* G4IeplusAnnihilation::PostStepDoIt(const G4Track& aTrack,
|
||||
const G4Step& aStep)
|
||||
//
|
||||
// The secondaries Gamma energies are sampled using the Heitler cross section.
|
||||
//
|
||||
// A modified version of the random number techniques of Butcher & Messel is used
|
||||
// (Nuc Phys 20(1960),15).
|
||||
//
|
||||
// GEANT4 internal units.
|
||||
//
|
||||
// Note 1 : The initial electron is assumed free and at rest.
|
||||
//
|
||||
// Note 2 : The annihilation processes producing one or more than two photons are
|
||||
// ignored, as negligible compared to the two photons process.
|
||||
|
||||
{
|
||||
aParticleChange.Initialize(aTrack);
|
||||
G4Material* aMaterial = aTrack.GetMaterial();
|
||||
|
||||
|
||||
const G4DynamicParticle* aDynamicPositron = aTrack.GetDynamicParticle();
|
||||
G4double PositKinEnergy = aDynamicPositron->GetKineticEnergy();
|
||||
G4ParticleMomentum PositDirection = aDynamicPositron->GetMomentumDirection();
|
||||
|
||||
aParticleChange.Initialize(aTrack);
|
||||
|
||||
// Do not make anything if PositKinEnergy=0. , the annihilation then
|
||||
// should be performed by the AtRestDoIt!
|
||||
if(PositKinEnergy == 0.)
|
||||
return &aParticleChange ;
|
||||
|
||||
G4double gama = 1. + PositKinEnergy/electron_mass_c2;
|
||||
G4double gamap1 = gama+1. , gamam1 = gama-1. , sqgrate = sqrt(gamam1/gamap1)/2. ,
|
||||
sqg2m1 = sqrt(gamam1*gamap1);
|
||||
|
||||
// limits of the energy sampling
|
||||
G4double epsil1 = 0.5 - sqgrate , epsil2 = 0.5 + sqgrate;
|
||||
G4double epsilqot = epsil2/epsil1;
|
||||
|
||||
//
|
||||
// sample the energy rate of the created gammas
|
||||
//
|
||||
G4double epsil, greject ;
|
||||
|
||||
do {
|
||||
epsil = epsil1*pow(epsilqot,G4UniformRand());
|
||||
greject = 1. - epsil + (2*gama*epsil-1.)/(epsil*gamap1*gamap1);
|
||||
} while( greject < G4UniformRand() );
|
||||
|
||||
//
|
||||
// scattered Gamma angles. ( Z - axis along the parent positron)
|
||||
//
|
||||
|
||||
G4double cost = (epsil*gamap1-1.)/(epsil*sqg2m1) , sint = sqrt((1.+cost)*(1.-cost));
|
||||
|
||||
|
||||
G4double phi = twopi * G4UniformRand() ;
|
||||
G4double dirx = sint*cos(phi) , diry = sint*sin(phi) , dirz = cost;
|
||||
|
||||
//
|
||||
// kinematic of the created pair
|
||||
//
|
||||
|
||||
G4double LocalEnerDeposit = 0. ;
|
||||
aParticleChange.SetNumberOfSecondaries(2) ;
|
||||
|
||||
G4double TotalAvailableEnergy = PositKinEnergy + 2*electron_mass_c2;
|
||||
G4double Phot1Energy = epsil*TotalAvailableEnergy;
|
||||
|
||||
G4double GammaCut= (G4Gamma::GetCutsInEnergy())[aMaterial->GetIndex()];
|
||||
|
||||
if (Phot1Energy > GammaCut)
|
||||
{
|
||||
G4ThreeVector Phot1Direction ( dirx, diry, dirz );
|
||||
Phot1Direction.rotateUz(PositDirection);
|
||||
|
||||
// create G4DynamicParticle object for the particle1
|
||||
G4DynamicParticle* aParticle1= new G4DynamicParticle (G4Gamma::Gamma(),
|
||||
Phot1Direction, Phot1Energy);
|
||||
aParticleChange.AddSecondary( aParticle1 ) ;
|
||||
}
|
||||
else
|
||||
{ LocalEnerDeposit += Phot1Energy; }
|
||||
|
||||
G4double Phot2Energy =(1.-epsil)*TotalAvailableEnergy;
|
||||
|
||||
if (Phot2Energy > GammaCut)
|
||||
{
|
||||
G4double Eratio = Phot1Energy/Phot2Energy;
|
||||
G4double PositP = sqrt(PositKinEnergy*(PositKinEnergy+2.*electron_mass_c2));
|
||||
G4ThreeVector Phot2Direction (-dirx*Eratio, -diry*Eratio,
|
||||
(PositP-dirz*Phot1Energy)/Phot2Energy);
|
||||
Phot2Direction.rotateUz(PositDirection);
|
||||
|
||||
// create G4DynamicParticle object for the particle2
|
||||
G4DynamicParticle* aParticle2= new G4DynamicParticle (G4Gamma::Gamma(),
|
||||
Phot2Direction, Phot2Energy);
|
||||
aParticleChange.AddSecondary( aParticle2 ) ;
|
||||
}
|
||||
else
|
||||
{ LocalEnerDeposit += Phot2Energy; }
|
||||
|
||||
aParticleChange.SetLocalEnergyDeposit( LocalEnerDeposit ) ;
|
||||
|
||||
//
|
||||
// Kill the incident positron
|
||||
//
|
||||
|
||||
aParticleChange.SetMomentumChange( 0., 0., 0. ) ;
|
||||
aParticleChange.SetEnergyChange( 0. ) ;
|
||||
aParticleChange.SetStatusChange( fStopAndKill ) ;
|
||||
|
||||
return &aParticleChange;
|
||||
}
|
||||
|
||||
|
||||
G4VParticleChange* G4IeplusAnnihilation::AtRestDoIt(const G4Track& aTrack,
|
||||
const G4Step& aStep)
|
||||
//
|
||||
// Performs the e+ e- annihilation when both particles are assumed at rest.
|
||||
// It generates two back to back photons with energy = electron_mass.
|
||||
// The angular distribution is isotropic.
|
||||
// GEANT4 internal units
|
||||
//
|
||||
// Note : Effects due to binding of atomic electrons are negliged.
|
||||
|
||||
{
|
||||
aParticleChange.Initialize(aTrack);
|
||||
G4Material* aMaterial = aTrack.GetMaterial();
|
||||
|
||||
aParticleChange.SetNumberOfSecondaries(2) ;
|
||||
|
||||
if (electron_mass_c2 > (G4Gamma::GetCutsInEnergy())[aMaterial->GetIndex()])
|
||||
{
|
||||
G4double cosTeta = 2*G4UniformRand()-1. , sinTeta = sqrt(1.-cosTeta*cosTeta);
|
||||
G4double Phi = twopi * G4UniformRand() ;
|
||||
G4ThreeVector Direction (sinTeta*cos(Phi), sinTeta*sin(Phi), cosTeta);
|
||||
|
||||
aParticleChange.AddSecondary( new G4DynamicParticle (G4Gamma::Gamma(),
|
||||
Direction, electron_mass_c2) );
|
||||
aParticleChange.AddSecondary( new G4DynamicParticle (G4Gamma::Gamma(),
|
||||
-Direction, electron_mass_c2) );
|
||||
|
||||
aParticleChange.SetLocalEnergyDeposit(0.);
|
||||
}
|
||||
else
|
||||
{ aParticleChange.SetLocalEnergyDeposit( 2*electron_mass_c2 ); }
|
||||
|
||||
// Kill the incident positron
|
||||
//
|
||||
aParticleChange.SetStatusChange( fStopAndKill );
|
||||
|
||||
return &aParticleChange;
|
||||
}
|
||||
|
||||
void G4IeplusAnnihilation::PrintInfoDefinition()
|
||||
{
|
||||
G4String comments="Total cross section from Heitler formula (2 photon annihilation).\n";
|
||||
comments += " gamma energies sampled according Heitler";
|
||||
|
||||
G4cout << endl << GetProcessName() << ": " << comments
|
||||
<< "\n PhysicsTables from " << G4BestUnit(LowestEnergyLimit,"Energy")
|
||||
<< " to " << G4BestUnit(HighestEnergyLimit,"Energy")
|
||||
<< " in " << NumbBinTable << " bins. \n";
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user