Gabriele Cosmo
628 lines
20 KiB
C++
628 lines
20 KiB
C++
//
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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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// G4VDecayChannel
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//
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// Author: H.Kurashige, 27 July 1996
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// --------------------------------------------------------------------
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#include "G4ParticleDefinition.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4ParticleTable.hh"
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#include "G4DecayTable.hh"
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#include "G4DecayProducts.hh"
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#include "G4VDecayChannel.hh"
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#include "G4AutoLock.hh"
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#include "Randomize.hh"
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const G4String G4VDecayChannel::noName = " ";
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// --------------------------------------------------------------------
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G4VDecayChannel::G4VDecayChannel()
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: parent_polarization()
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{
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// set pointer to G4ParticleTable (static and singleton object)
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particletable = G4ParticleTable::GetParticleTable();
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}
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// --------------------------------------------------------------------
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G4VDecayChannel::G4VDecayChannel(const G4String& aName, G4int verbose)
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: kinematics_name(aName), parent_polarization(), verboseLevel(verbose)
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{
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// set pointer to G4ParticleTable (static and singleton object)
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particletable = G4ParticleTable::GetParticleTable();
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}
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// --------------------------------------------------------------------
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G4VDecayChannel::G4VDecayChannel(const G4String& aName,
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const G4String& theParentName,
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G4double theBR,
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G4int theNumberOfDaughters,
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const G4String& theDaughterName1,
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const G4String& theDaughterName2,
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const G4String& theDaughterName3,
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const G4String& theDaughterName4 )
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: kinematics_name(aName), rbranch(theBR), parent_polarization(),
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numberOfDaughters(theNumberOfDaughters)
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{
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// set pointer to G4ParticleTable (static and singleton object)
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particletable = G4ParticleTable::GetParticleTable();
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// parent name
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parent_name = new G4String(theParentName);
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// cleate array
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daughters_name = new G4String*[numberOfDaughters];
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for (G4int index=0; index<numberOfDaughters; ++index)
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{
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daughters_name[index] = nullptr;
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}
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// daughters' name
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if (numberOfDaughters>0) daughters_name[0] = new G4String(theDaughterName1);
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if (numberOfDaughters>1) daughters_name[1] = new G4String(theDaughterName2);
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if (numberOfDaughters>2) daughters_name[2] = new G4String(theDaughterName3);
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if (numberOfDaughters>3) daughters_name[3] = new G4String(theDaughterName4);
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if (rbranch <0. ) rbranch = 0.0;
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else if (rbranch >1.0 ) rbranch = 1.0;
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}
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// --------------------------------------------------------------------
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G4VDecayChannel::G4VDecayChannel(const G4VDecayChannel& right)
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{
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kinematics_name = right.kinematics_name;
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verboseLevel = right.verboseLevel;
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rbranch = right.rbranch;
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rangeMass = right.rangeMass;
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// copy parent name
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parent_name = new G4String(*right.parent_name);
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// create array
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numberOfDaughters = right.numberOfDaughters;
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daughters_name = nullptr;
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if ( numberOfDaughters >0 )
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{
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daughters_name = new G4String*[numberOfDaughters];
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// copy daughters name
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for (G4int index=0; index<numberOfDaughters; ++index)
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{
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daughters_name[index] = new G4String(*right.daughters_name[index]);
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}
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}
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// particle table
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particletable = G4ParticleTable::GetParticleTable();
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parent_polarization = right.parent_polarization;
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G4MUTEXINIT(daughtersMutex);
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G4MUTEXINIT(parentMutex);
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}
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// --------------------------------------------------------------------
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G4VDecayChannel& G4VDecayChannel::operator=(const G4VDecayChannel& right)
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{
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if (this != &right)
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{
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kinematics_name = right.kinematics_name;
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verboseLevel = right.verboseLevel;
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rbranch = right.rbranch;
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rangeMass = right.rangeMass;
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parent_polarization = right.parent_polarization;
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// copy parent name
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delete parent_name;
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parent_name = new G4String(*right.parent_name);
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// clear daughters_name array
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ClearDaughtersName();
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// recreate array
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numberOfDaughters = right.numberOfDaughters;
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if ( numberOfDaughters >0 )
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{
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daughters_name = new G4String*[numberOfDaughters];
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// copy daughters name
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for (G4int index=0; index<numberOfDaughters; ++index)
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{
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daughters_name[index] = new G4String(*right.daughters_name[index]);
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}
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}
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}
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// particle table
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particletable = G4ParticleTable::GetParticleTable();
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G4MUTEXINIT(daughtersMutex);
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G4MUTEXINIT(parentMutex);
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return *this;
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}
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// --------------------------------------------------------------------
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G4VDecayChannel::~G4VDecayChannel()
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{
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ClearDaughtersName();
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delete parent_name;
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parent_name = nullptr;
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delete [] G4MT_daughters_mass;
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G4MT_daughters_mass = nullptr;
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delete [] G4MT_daughters_width;
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G4MT_daughters_width = nullptr;
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G4MUTEXDESTROY(daughtersMutex);
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G4MUTEXDESTROY(parentMutex);
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}
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// --------------------------------------------------------------------
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void G4VDecayChannel::ClearDaughtersName()
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{
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G4AutoLock l(&daughtersMutex);
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if ( daughters_name != nullptr)
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{
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if (numberOfDaughters>0)
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{
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#ifdef G4VERBOSE
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if (verboseLevel>1)
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{
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G4cout << "G4VDecayChannel::ClearDaughtersName() "
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<< " for " << *parent_name << G4endl;
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}
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#endif
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for (G4int index=0; index<numberOfDaughters; ++index)
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{
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delete daughters_name[index];
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}
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}
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delete [] daughters_name;
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daughters_name = nullptr;
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}
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delete [] G4MT_daughters;
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delete [] G4MT_daughters_mass;
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delete [] G4MT_daughters_width;
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G4MT_daughters_width = nullptr;
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G4MT_daughters = nullptr;
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G4MT_daughters_mass = nullptr;
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numberOfDaughters = 0;
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}
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// --------------------------------------------------------------------
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void G4VDecayChannel::SetNumberOfDaughters(G4int size)
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{
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if (size >0)
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{
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// remove old contents
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ClearDaughtersName();
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// cleate array
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daughters_name = new G4String*[size];
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for (G4int index=0; index<size; ++index)
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{
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daughters_name[index] = nullptr;
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}
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numberOfDaughters = size;
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}
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}
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// --------------------------------------------------------------------
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void G4VDecayChannel::SetDaughter(G4int anIndex, const G4String& particle_name)
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{
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// check numberOfDaughters is positive
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if (numberOfDaughters<=0)
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{
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#ifdef G4VERBOSE
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if (verboseLevel>0)
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{
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G4cout << "G4VDecayChannel::SetDaughter() - "
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<< "Number of daughters is not defined" << G4endl;
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}
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#endif
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return;
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}
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// An analysis of this code, shows that this method is called
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// only in the constructor of derived classes.
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// The general idea of this method is probably to support
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// the possibility to re-define daughters on the fly, however
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// this design is extremely problematic for MT mode, we thus
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// require (as practically happens) that the method is called only
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// at construction, i.e. when G4MT_daughters == 0
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// moreover this method can be called only after SetNumberOfDaugthers()
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// has been called (see previous if), in such a case daughters_name != nullptr
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//
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if ( daughters_name == nullptr )
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{
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G4Exception("G4VDecayChannel::SetDaughter()", "PART112", FatalException,
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"Trying to add a daughter without specifying number of secondaries!");
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return;
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}
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if ( G4MT_daughters != nullptr )
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{
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G4Exception("G4VDecayChannel::SetDaughter()", "PART111", FatalException,
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"Trying to modify a daughter of a decay channel, \
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but decay channel already has daughters.");
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return;
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}
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// check an index
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if ( (anIndex<0) || (anIndex>=numberOfDaughters) )
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{
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#ifdef G4VERBOSE
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if (verboseLevel>0)
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{
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G4cout << "G4VDecayChannel::SetDaughter() - "
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<< "index out of range " << anIndex << G4endl;
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}
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#endif
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}
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else
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{
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// fill the name
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daughters_name[anIndex] = new G4String(particle_name);
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#ifdef G4VERBOSE
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if (verboseLevel>1)
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{
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G4cout << "G4VDecayChannel::SetDaughter[" << anIndex <<"] :";
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G4cout << daughters_name[anIndex] << ":"
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<< *daughters_name[anIndex]<<G4endl;
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}
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#endif
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}
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}
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// --------------------------------------------------------------------
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void G4VDecayChannel::
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SetDaughter(G4int anIndex, const G4ParticleDefinition* parent_type)
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{
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if (parent_type != nullptr)
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SetDaughter(anIndex, parent_type->GetParticleName());
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}
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// --------------------------------------------------------------------
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void G4VDecayChannel::FillDaughters()
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{
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G4AutoLock lock(&daughtersMutex);
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// Double check, check again if another thread has already filled this, in
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// case do not need to do anything
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if ( G4MT_daughters != nullptr ) return;
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G4int index;
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#ifdef G4VERBOSE
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if (verboseLevel>1) G4cout << "G4VDecayChannel::FillDaughters()" << G4endl;
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#endif
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if (G4MT_daughters != nullptr)
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{
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delete [] G4MT_daughters;
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G4MT_daughters = nullptr;
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}
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// parent mass
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CheckAndFillParent();
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G4double parentmass = G4MT_parent->GetPDGMass();
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//
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G4double sumofdaughtermass = 0.0;
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G4double sumofdaughterwidthsq = 0.0;
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if ((numberOfDaughters <=0) || (daughters_name == nullptr) )
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{
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#ifdef G4VERBOSE
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if (verboseLevel>0)
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{
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G4cout << "G4VDecayChannel::FillDaughters() - "
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<< "[ " << G4MT_parent->GetParticleName() << " ]"
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<< "numberOfDaughters is not defined yet";
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}
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#endif
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G4MT_daughters = nullptr;
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G4Exception("G4VDecayChannel::FillDaughters()",
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"PART011", FatalException,
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"Cannot fill daughters: numberOfDaughters is not defined yet");
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}
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// create and set the array of pointers to daughter particles
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G4MT_daughters = new G4ParticleDefinition*[numberOfDaughters];
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if (G4MT_daughters_mass != nullptr) delete [] G4MT_daughters_mass;
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if (G4MT_daughters_width != nullptr) delete [] G4MT_daughters_width;
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G4MT_daughters_mass = new G4double[numberOfDaughters];
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G4MT_daughters_width = new G4double[numberOfDaughters];
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// loop over all daughters
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for (index=0; index<numberOfDaughters; ++index)
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{
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if (daughters_name[index] == nullptr)
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{
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// daughter name is not defined
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#ifdef G4VERBOSE
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if (verboseLevel>0)
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{
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G4cout << "G4VDecayChannel::FillDaughters() - "
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<< "[ " << G4MT_parent->GetParticleName() << " ]"
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<< index << "-th daughter is not defined yet" << G4endl;
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}
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#endif
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G4MT_daughters[index] = nullptr;
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G4Exception("G4VDecayChannel::FillDaughters()",
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"PART011", FatalException,
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"Cannot fill daughters: name of daughter is not defined yet");
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}
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// search daughter particles in the particle table
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G4MT_daughters[index] = particletable->FindParticle(*daughters_name[index]);
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if (G4MT_daughters[index] == nullptr )
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{
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// cannot find the daughter particle
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#ifdef G4VERBOSE
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if (verboseLevel>0)
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{
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G4cout << "G4VDecayChannel::FillDaughters() - "
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<< "[ " << G4MT_parent->GetParticleName() << " ]"
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<< index << ":" << *daughters_name[index]
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<< " is not defined !!" << G4endl;
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G4cout << " The BR of this decay mode is set to zero." << G4endl;
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}
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#endif
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SetBR(0.0);
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return;
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}
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#ifdef G4VERBOSE
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if (verboseLevel>1)
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{
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G4cout << index << ":" << *daughters_name[index];
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G4cout << ":" << G4MT_daughters[index] << G4endl;
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}
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#endif
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G4MT_daughters_mass[index] = G4MT_daughters[index]->GetPDGMass();
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G4double d_width = G4MT_daughters[index]->GetPDGWidth();
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G4MT_daughters_width[index] = d_width;
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sumofdaughtermass += G4MT_daughters[index]->GetPDGMass();
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sumofdaughterwidthsq += d_width*d_width;
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} // end loop over all daughters
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// check sum of daghter mass
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G4double widthMass = std::sqrt(G4MT_parent->GetPDGWidth()
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*G4MT_parent->GetPDGWidth()
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+sumofdaughterwidthsq);
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if ( (G4MT_parent->GetParticleType() != "nucleus")
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&& (numberOfDaughters !=1)
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&& (sumofdaughtermass > parentmass + rangeMass*widthMass) )
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{
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// !!! illegal mass !!!
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#ifdef G4VERBOSE
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if (GetVerboseLevel()>0)
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{
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G4cout << "G4VDecayChannel::FillDaughters() - "
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<< "[ " << G4MT_parent->GetParticleName() << " ]"
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<< " Energy/Momentum conserevation breaks " << G4endl;
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if (GetVerboseLevel()>1)
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{
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G4cout << " parent:" << *parent_name
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<< " mass:" << parentmass/GeV << "[GeV/c/c]" << G4endl;
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for (index=0; index<numberOfDaughters; ++index)
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{
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G4cout << " daughter " << index << ":" << *daughters_name[index]
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<< " mass:" << G4MT_daughters[index]->GetPDGMass()/GeV
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<< "[GeV/c/c]" << G4endl;
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}
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}
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}
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#endif
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}
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}
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// --------------------------------------------------------------------
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void G4VDecayChannel::FillParent()
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{
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G4AutoLock lock(&parentMutex);
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// Double check, check again if another thread has already filled this, in
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// case do not need to do anything
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if ( G4MT_parent != nullptr ) return;
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if (parent_name == nullptr)
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{
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// parent name is not defined
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#ifdef G4VERBOSE
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if (verboseLevel>0)
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{
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G4cout << "G4VDecayChannel::FillParent() - "
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<< "parent name is not defined !!" << G4endl;
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}
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#endif
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G4MT_parent = nullptr;
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G4Exception("G4VDecayChannel::FillParent()",
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"PART012", FatalException,
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"Cannot fill parent: parent name is not defined yet");
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return;
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}
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// search parent particle in the particle table
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G4MT_parent = particletable->FindParticle(*parent_name);
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if (G4MT_parent == nullptr)
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{
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// parent particle does not exist
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#ifdef G4VERBOSE
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if (verboseLevel>0)
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{
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G4cout << "G4VDecayChannel::FillParent() - "
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<< *parent_name << " does not exist !!" << G4endl;
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}
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#endif
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G4Exception("G4VDecayChannel::FillParent()",
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"PART012", FatalException,
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"Cannot fill parent: parent does not exist");
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return;
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}
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G4MT_parent_mass = G4MT_parent->GetPDGMass();
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}
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// --------------------------------------------------------------------
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void G4VDecayChannel::SetParent(const G4ParticleDefinition* parent_type)
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{
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if (parent_type != nullptr) SetParent(parent_type->GetParticleName());
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}
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// --------------------------------------------------------------------
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G4int G4VDecayChannel::GetAngularMomentum()
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{
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// determine angular momentum
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// fill pointers to daughter particles if not yet set
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CheckAndFillDaughters();
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const G4int PiSpin = G4MT_parent->GetPDGiSpin();
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const G4int PParity = G4MT_parent->GetPDGiParity();
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if (2==numberOfDaughters) // up to now we can only handle two particle decays
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{
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const G4int D1iSpin = G4MT_daughters[0]->GetPDGiSpin();
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const G4int D1Parity = G4MT_daughters[0]->GetPDGiParity();
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const G4int D2iSpin = G4MT_daughters[1]->GetPDGiSpin();
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const G4int D2Parity = G4MT_daughters[1]->GetPDGiParity();
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const G4int MiniSpin = std::abs (D1iSpin - D2iSpin);
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const G4int MaxiSpin = D1iSpin + D2iSpin;
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const G4int lMax = (PiSpin+D1iSpin+D2iSpin)/2; // l is always int
|
|
G4int lMin;
|
|
#ifdef G4VERBOSE
|
|
if (verboseLevel>1)
|
|
{
|
|
G4cout << "iSpin: " << PiSpin << " -> " << D1iSpin
|
|
<< " + " << D2iSpin << G4endl;
|
|
G4cout << "2*jmin, 2*jmax, lmax " << MiniSpin << " " << MaxiSpin
|
|
<< " " << lMax << G4endl;
|
|
}
|
|
#endif
|
|
for (G4int j=MiniSpin; j<=MaxiSpin; j+=2) // loop over all possible
|
|
{ // spin couplings
|
|
lMin = std::abs(PiSpin-j)/2;
|
|
#ifdef G4VERBOSE
|
|
if (verboseLevel>1)
|
|
G4cout << "-> checking 2*j=" << j << G4endl;
|
|
#endif
|
|
for (G4int l=lMin; l<=lMax; ++l)
|
|
{
|
|
#ifdef G4VERBOSE
|
|
if (verboseLevel>1)
|
|
G4cout << " checking l=" << l << G4endl;
|
|
#endif
|
|
if (l%2==0)
|
|
{
|
|
if (PParity == D1Parity*D2Parity) // check parity for this l
|
|
return l;
|
|
}
|
|
else
|
|
{
|
|
if (PParity == -1*D1Parity*D2Parity) // check parity for this l
|
|
return l;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
G4Exception("G4VDecayChannel::GetAngularMomentum()",
|
|
"PART111", JustWarning,
|
|
"Sorry, can't handle 3 particle decays (up to now)");
|
|
return 0;
|
|
}
|
|
G4Exception ("G4VDecayChannel::GetAngularMomentum()",
|
|
"PART111", JustWarning,
|
|
"Can't find angular momentum for this decay");
|
|
return 0;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
void G4VDecayChannel::DumpInfo()
|
|
{
|
|
G4cout << " BR: " << rbranch << " [" << kinematics_name << "]";
|
|
G4cout << " : " ;
|
|
for (G4int index=0; index<numberOfDaughters; ++index)
|
|
{
|
|
if(daughters_name[index] != nullptr)
|
|
{
|
|
G4cout << " " << *(daughters_name[index]);
|
|
}
|
|
else
|
|
{
|
|
G4cout << " not defined ";
|
|
}
|
|
}
|
|
G4cout << G4endl;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
const G4String& G4VDecayChannel::GetNoName() const
|
|
{
|
|
return noName;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
G4double G4VDecayChannel::
|
|
DynamicalMass(G4double massPDG, G4double width, G4double maxDev ) const
|
|
{
|
|
if (width<=0.0) return massPDG;
|
|
if (maxDev >rangeMass) maxDev = rangeMass;
|
|
if (maxDev <=-1.*rangeMass) return massPDG; // cannot calculate
|
|
|
|
G4double x = G4UniformRand()*(maxDev+rangeMass) - rangeMass;
|
|
G4double y = G4UniformRand();
|
|
const std::size_t MAX_LOOP=10000;
|
|
for (std::size_t loop_counter=0; loop_counter <MAX_LOOP; ++loop_counter)
|
|
{
|
|
if ( y * (width*width*x*x + massPDG*massPDG*width*width)
|
|
<= massPDG*massPDG*width*width ) break;
|
|
x = G4UniformRand()*(maxDev+rangeMass) - rangeMass;
|
|
y = G4UniformRand();
|
|
}
|
|
G4double mass = massPDG + x*width;
|
|
return mass;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
G4bool G4VDecayChannel::IsOKWithParentMass(G4double parentMass)
|
|
{
|
|
G4double sumOfDaughterMassMin = 0.0;
|
|
CheckAndFillParent();
|
|
CheckAndFillDaughters();
|
|
// skip one body decay
|
|
if (numberOfDaughters==1) return true;
|
|
|
|
for (G4int index=0; index<numberOfDaughters; ++index)
|
|
{
|
|
sumOfDaughterMassMin +=
|
|
G4MT_daughters_mass[index] - rangeMass*G4MT_daughters_width[index];
|
|
}
|
|
return (parentMass >= sumOfDaughterMassMin);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
void G4VDecayChannel::SetBR(G4double value)
|
|
{
|
|
rbranch = value;
|
|
if (rbranch <0. ) rbranch = 0.0;
|
|
else if (rbranch >1.0 ) rbranch = 1.0;
|
|
}
|