Import Geant4 9.1.0 source tree
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Gabriele Cosmo
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//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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#include "G4QMDNucleus.hh"
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#include "G4Proton.hh"
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#include "G4Neutron.hh"
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#include "G4NucleiProperties.hh"
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#include <numeric>
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G4QMDNucleus::G4QMDNucleus()
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{
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G4QMDParameters* parameters = G4QMDParameters::GetInstance();
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hbc = parameters->Get_hbc();
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}
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G4QMDNucleus::~G4QMDNucleus()
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{
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;
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}
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G4LorentzVector G4QMDNucleus::Get4Momentum()
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{
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G4LorentzVector p( 0 );
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std::vector< G4QMDParticipant* >::iterator it;
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for ( it = participants.begin() ; it != participants.end() ; it++ )
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p += (*it)->Get4Momentum();
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return p;
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}
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G4int G4QMDNucleus::GetMassNumber()
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{
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G4int A = 0;
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std::vector< G4QMDParticipant* >::iterator it;
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for ( it = participants.begin() ; it != participants.end() ; it++ )
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{
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if ( (*it)->GetDefinition() == G4Proton::Proton()
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|| (*it)->GetDefinition() == G4Neutron::Neutron() )
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A++;
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}
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return A;
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}
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G4int G4QMDNucleus::GetAtomicNumber()
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{
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G4int Z = 0;
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std::vector< G4QMDParticipant* >::iterator it;
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for ( it = participants.begin() ; it != participants.end() ; it++ )
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{
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if ( (*it)->GetDefinition() == G4Proton::Proton() )
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Z++;
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}
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return Z;
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}
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G4double G4QMDNucleus::GetNuclearMass()
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{
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G4double mass = G4NucleiPropertiesTable::GetNuclearMass( GetAtomicNumber() , GetMassNumber() );
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if ( mass == 0.0 )
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{
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G4int Z = GetAtomicNumber();
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G4int A = GetMassNumber();
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G4int N = A - Z;
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// Weizsacker-Bethe
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G4double Av = 16*MeV;
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G4double As = 17*MeV;
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G4double Ac = 0.7*MeV;
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G4double Asym = 23*MeV;
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G4double BE = Av * A
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- As * std::pow ( G4double ( A ) , 2.0/3.0 )
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- Ac * Z*Z/std::pow ( G4double ( A ) , 1.0/3.0 )
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- Asym * ( N - Z )* ( N - Z ) / A;
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mass = Z * G4Proton::Proton()->GetPDGMass()
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+ N * G4Neutron::Neutron()->GetPDGMass()
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- BE;
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}
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return mass;
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}
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void G4QMDNucleus::CalEnergyAndAngularMomentumInCM()
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{
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//G4cout << "CalEnergyAndAngularMomentumInCM " << this->GetAtomicNumber() << " " << GetMassNumber() << G4endl;
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G4double gamma = Get4Momentum().gamma();
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G4ThreeVector beta = Get4Momentum().v()/ Get4Momentum().e();
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G4ThreeVector pcm0( 0.0 ) ;
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G4int n = GetTotalNumberOfParticipant();
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pcm.resize( n );
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for ( G4int i= 0; i < n ; i++ )
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{
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G4ThreeVector p_i = GetParticipant( i )->GetMomentum();
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G4double trans = gamma / ( gamma + 1.0 ) * p_i * beta;
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pcm[i] = p_i - trans*beta;
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pcm0 += pcm[i];
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}
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pcm0 = pcm0 / double ( n );
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//G4cout << "pcm0 " << pcm0 << G4endl;
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for ( G4int i= 0; i < n ; i++ )
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{
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pcm[i] += -pcm0;
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//G4cout << "pcm " << i << " " << pcm[i] << G4endl;
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}
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G4double tmass = 0;
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G4ThreeVector rcm0( 0.0 ) ;
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rcm.resize( n );
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es.resize( n );
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for ( G4int i= 0; i < n ; i++ )
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{
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G4ThreeVector ri = GetParticipant( i )->GetPosition();
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G4double trans = gamma / ( gamma + 1.0 ) * ri * beta;
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es[i] = std::sqrt ( std::pow ( GetParticipant( i )->GetMass() , 2 ) + pcm[i]*pcm[i] );
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rcm[i] = ri + trans*beta;
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rcm0 += rcm[i]*es[i];
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tmass += es[i];
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}
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rcm0 = rcm0/tmass;
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for ( G4int i= 0; i < n ; i++ )
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{
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rcm[i] += -rcm0;
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//G4cout << "rcm " << i << " " << rcm[i] << G4endl;
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}
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// Angluar momentum
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G4ThreeVector rl ( 0.0 );
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for ( G4int i= 0; i < n ; i++ )
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{
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rl += rcm[i].cross ( pcm[i] );
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}
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jj = int ( std::sqrt ( rl*rl / hbc ) + 0.5 );
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// kinetic energy per nucleon in CM
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G4double totalMass = 0.0;
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for ( G4int i= 0; i < n ; i++ )
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{
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// following two lines are equivalent
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//totalMass += GetParticipant( i )->GetDefinition()->GetPDGMass()/GeV;
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totalMass += GetParticipant( i )->GetMass();
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}
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kineticEnergyPerNucleon = ( std::accumulate ( es.begin() , es.end() , 0.0 ) - totalMass )/n;
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// Total (not per nucleion ) Binding Energy
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bindingEnergy = ( std::accumulate ( es.begin() , es.end() , 0.0 ) -totalMass ) + potentialEnergy;
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//G4cout << "KineticEnergyPerNucleon in GeV " << kineticEnergyPerNucleon << G4endl;
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//G4cout << "KineticEnergySum in GeV " << std::accumulate ( es.begin() , es.end() , 0.0 ) - totalMass << G4endl;
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//G4cout << "PotentialEnergy in GeV " << potentialEnergy << G4endl;
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//G4cout << "BindingEnergy in GeV " << bindingEnergy << G4endl;
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//G4cout << "G4BindingEnergy in GeV " << G4NucleiPropertiesTable::GetBindingEnergy( GetAtomicNumber() , GetMassNumber() )/GeV << G4endl;
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excitationEnergy = bindingEnergy + G4NucleiPropertiesTable::GetBindingEnergy( GetAtomicNumber() , GetMassNumber() )/GeV;
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//G4cout << "excitationEnergy in GeV " << excitationEnergy << G4endl;
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if ( excitationEnergy < 0 ) excitationEnergy = 0.0;
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}
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