Gabriele Cosmo
314 lines
9.1 KiB
C++
314 lines
9.1 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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//
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// $Id: G4StatMFMacroCanonical.cc,v 1.8 2008/11/19 14:33:31 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-02 $
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//
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// by V. Lara
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// --------------------------------------------------------------------
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//
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// Modified:
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// 25.07.08 I.Pshenichnov (in collaboration with Alexander Botvina and Igor
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// Mishustin (FIAS, Frankfurt, INR, Moscow and Kurchatov Institute,
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// Moscow, pshenich@fias.uni-frankfurt.de) fixed infinite loop for
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// a fagment with Z=A; fixed memory leak
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#include "G4StatMFMacroCanonical.hh"
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// constructor
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G4StatMFMacroCanonical::G4StatMFMacroCanonical(const G4Fragment & theFragment)
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{
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// Get memory for clusters
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_theClusters.push_back(new G4StatMFMacroNucleon); // Size 1
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_theClusters.push_back(new G4StatMFMacroBiNucleon); // Size 2
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_theClusters.push_back(new G4StatMFMacroTriNucleon); // Size 3
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_theClusters.push_back(new G4StatMFMacroTetraNucleon); // Size 4
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for (G4int i = 4; i < theFragment.GetA(); i++)
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_theClusters.push_back(new G4StatMFMacroMultiNucleon(i+1)); // Size 5 ... A
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// Perform class initialization
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Initialize(theFragment);
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}
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// destructor
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G4StatMFMacroCanonical::~G4StatMFMacroCanonical()
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{
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// garbage collection
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if (!_theClusters.empty())
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{
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std::for_each(_theClusters.begin(),_theClusters.end(),DeleteFragment());
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}
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}
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// operators definitions
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G4StatMFMacroCanonical &
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G4StatMFMacroCanonical::operator=(const G4StatMFMacroCanonical & )
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroCanonical::operator= meant to not be accessable");
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return *this;
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}
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G4bool G4StatMFMacroCanonical::operator==(const G4StatMFMacroCanonical & ) const
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{
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return false;
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}
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G4bool G4StatMFMacroCanonical::operator!=(const G4StatMFMacroCanonical & ) const
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{
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return true;
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}
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// Initialization method
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void G4StatMFMacroCanonical::Initialize(const G4Fragment & theFragment)
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{
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G4double A = theFragment.GetA();
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G4double Z = theFragment.GetZ();
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// Free Internal energy at T = 0
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__FreeInternalE0 = A*( -G4StatMFParameters::GetE0() + // Volume term (for T = 0)
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G4StatMFParameters::GetGamma0()* // Symmetry term
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(1.0-2.0*Z/A)*(1.0-2.0*Z/A) ) +
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G4StatMFParameters::GetBeta0()*std::pow(A,2.0/3.0) + // Surface term (for T = 0)
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(3.0/5.0)*elm_coupling*Z*Z/(G4StatMFParameters::Getr0()* // Coulomb term
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std::pow(A,1.0/3.0));
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CalculateTemperature(theFragment);
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return;
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}
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void G4StatMFMacroCanonical::CalculateTemperature(const G4Fragment & theFragment)
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{
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// Excitation Energy
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G4double U = theFragment.GetExcitationEnergy();
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G4double A = theFragment.GetA();
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G4double Z = theFragment.GetZ();
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// Fragment Multiplicity
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G4double FragMult = std::max((1.0+(2.31/MeV)*(U/A - 3.5*MeV))*A/100.0, 2.0);
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// Parameter Kappa
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_Kappa = (1.0+elm_coupling*(std::pow(FragMult,1./3.)-1)/
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(G4StatMFParameters::Getr0()*std::pow(A,1./3.)));
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_Kappa = _Kappa*_Kappa*_Kappa - 1.0;
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G4StatMFMacroTemperature * theTemp = new
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G4StatMFMacroTemperature(A,Z,U,__FreeInternalE0,_Kappa,&_theClusters);
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__MeanTemperature = theTemp->CalcTemperature();
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_ChemPotentialNu = theTemp->GetChemicalPotentialNu();
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_ChemPotentialMu = theTemp->GetChemicalPotentialMu();
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__MeanMultiplicity = theTemp->GetMeanMultiplicity();
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__MeanEntropy = theTemp->GetEntropy();
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delete theTemp;
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return;
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}
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// --------------------------------------------------------------------------
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G4StatMFChannel * G4StatMFMacroCanonical::ChooseAandZ(const G4Fragment &theFragment)
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// Calculate total fragments multiplicity, fragment atomic numbers and charges
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{
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G4double A = theFragment.GetA();
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G4double Z = theFragment.GetZ();
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std::vector<G4double> ANumbers(static_cast<G4int>(A));
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G4double Multiplicity = ChooseA(A,ANumbers);
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std::vector<G4double> FragmentsA;
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G4int i = 0;
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for (i = 0; i < A; i++)
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{
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for (G4int j = 0; j < ANumbers[i]; j++) FragmentsA.push_back(i+1);
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}
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// Sort fragments in decreasing order
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G4int im = 0;
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for (G4int j = 0; j < Multiplicity; j++)
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{
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G4double FragmentsAMax = 0.0;
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im = j;
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for (i = j; i < Multiplicity; i++)
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{
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if (FragmentsA[i] <= FragmentsAMax) continue;
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else
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{
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im = i;
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FragmentsAMax = FragmentsA[im];
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}
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}
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if (im != j)
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{
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FragmentsA[im] = FragmentsA[j];
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FragmentsA[j] = FragmentsAMax;
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}
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}
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return ChooseZ(static_cast<G4int>(Z),FragmentsA);
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}
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G4double G4StatMFMacroCanonical::ChooseA(const G4double A, std::vector<G4double> & ANumbers)
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// Determines fragments multiplicities and compute total fragment multiplicity
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{
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G4double multiplicity = 0.0;
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G4int i;
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std::vector<G4double> AcumMultiplicity;
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AcumMultiplicity.reserve(static_cast<G4int>(A));
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AcumMultiplicity.push_back((*(_theClusters.begin()))->GetMeanMultiplicity());
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for (std::vector<G4VStatMFMacroCluster*>::iterator it = _theClusters.begin()+1;
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it != _theClusters.end(); ++it)
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{
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AcumMultiplicity.push_back((*it)->GetMeanMultiplicity()+AcumMultiplicity.back());
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}
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G4int CheckA;
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do {
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CheckA = -1;
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G4int SumA = 0;
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G4int ThisOne = 0;
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multiplicity = 0.0;
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for (i = 0; i < A; i++) ANumbers[i] = 0.0;
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do {
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G4double RandNumber = G4UniformRand()*__MeanMultiplicity;
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for (i = 0; i < A; i++) {
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if (RandNumber < AcumMultiplicity[i]) {
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ThisOne = i;
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break;
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}
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}
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multiplicity++;
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ANumbers[ThisOne] = ANumbers[ThisOne]+1;
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SumA += ThisOne+1;
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CheckA = static_cast<G4int>(A) - SumA;
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} while (CheckA > 0);
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} while (CheckA < 0 || std::abs(__MeanMultiplicity - multiplicity) > std::sqrt(__MeanMultiplicity) + 1./2.);
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return multiplicity;
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}
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G4StatMFChannel * G4StatMFMacroCanonical::ChooseZ(const G4int & Z,
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std::vector<G4double> & FragmentsA)
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//
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{
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std::vector<G4double> FragmentsZ;
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G4double DeltaZ = 0.0;
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G4double CP = (3./5.)*(elm_coupling/G4StatMFParameters::Getr0())*
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(1.0 - 1.0/std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1./3.));
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G4int multiplicity = FragmentsA.size();
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do
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{
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FragmentsZ.clear();
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G4int SumZ = 0;
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for (G4int i = 0; i < multiplicity; i++)
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{
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G4double A = FragmentsA[i];
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if (A <= 1.0)
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{
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G4double RandNumber = G4UniformRand();
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if (RandNumber < (*_theClusters.begin())->GetZARatio())
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{
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FragmentsZ.push_back(1.0);
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SumZ += static_cast<G4int>(FragmentsZ[i]);
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}
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else FragmentsZ.push_back(0.0);
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}
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else
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{
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G4double RandZ;
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G4double CC = 8.0*G4StatMFParameters::GetGamma0()+2.0*CP*std::pow(FragmentsA[i],2./3.);
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G4double ZMean;
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if (FragmentsA[i] > 1.5 && FragmentsA[i] < 4.5) ZMean = 0.5*FragmentsA[i];
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else ZMean = FragmentsA[i]*(4.0*G4StatMFParameters::GetGamma0()+_ChemPotentialNu)/CC;
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G4double ZDispersion = std::sqrt(FragmentsA[i]*__MeanTemperature/CC);
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G4int z;
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do
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{
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RandZ = G4RandGauss::shoot(ZMean,ZDispersion);
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z = static_cast<G4int>(RandZ+0.5);
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} while (z < 0 || z > A);
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FragmentsZ.push_back(z);
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SumZ += z;
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}
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}
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DeltaZ = Z - SumZ;
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}
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while (std::abs(DeltaZ) > 1.1);
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// DeltaZ can be 0, 1 or -1
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G4int idx = 0;
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if (DeltaZ < 0.0)
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{
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while (FragmentsZ[idx] < 0.5) ++idx;
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}
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FragmentsZ[idx] += DeltaZ;
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G4StatMFChannel * theChannel = new G4StatMFChannel;
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for (G4int i = multiplicity-1; i >= 0; i--)
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{
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theChannel->CreateFragment(FragmentsA[i],FragmentsZ[i]);
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}
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return theChannel;
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}
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