Gabriele Cosmo
154 lines
5.3 KiB
C++
154 lines
5.3 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: G4StatMFFragment.cc,v 1.6 2006/06/29 20:24:47 gunter Exp $
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// GEANT4 tag $Name: geant4-08-02 $
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//
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// Hadronic Process: Nuclear De-excitations
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// by V. Lara
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#include "G4StatMFFragment.hh"
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#include "G4HadronicException.hh"
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// Copy constructor
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G4StatMFFragment::G4StatMFFragment(const G4StatMFFragment & )
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4StatMFFragment::copy_constructor meant to not be accessable");
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}
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// Operators
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G4StatMFFragment & G4StatMFFragment::
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operator=(const G4StatMFFragment & )
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4StatMFFragment::operator= meant to not be accessable");
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return *this;
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}
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G4bool G4StatMFFragment::operator==(const G4StatMFFragment & ) const
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{
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// throw G4HadronicException(__FILE__, __LINE__, "G4StatMFFragment::operator== meant to not be accessable");
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return false;
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}
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G4bool G4StatMFFragment::operator!=(const G4StatMFFragment & ) const
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{
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// throw G4HadronicException(__FILE__, __LINE__, "G4StatMFFragment::operator!= meant to not be accessable");
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return true;
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}
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G4double G4StatMFFragment::GetCoulombEnergy(void) const
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{
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if (theZ <= 0.1) return 0.0;
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G4double Coulomb = (3./5.)*(elm_coupling*theZ*theZ)*
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std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1./3.)/
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(G4StatMFParameters::Getr0()*std::pow(theA,1./3.));
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return Coulomb;
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}
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G4double G4StatMFFragment::GetEnergy(const G4double T) const
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{
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if (theA < 1 || theZ < 0 || theZ > theA) {
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G4cerr << "G4StatMFFragment::GetEnergy: A = " << theA
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<< ", Z = " << theZ << G4endl;
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throw G4HadronicException(__FILE__, __LINE__,
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"G4StatMFFragment::GetEnergy: Wrong values for A and Z!");
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}
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G4double BulkEnergy = G4NucleiProperties::GetMassExcess(static_cast<G4int>(theA),
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static_cast<G4int>(theZ));
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if (theA < 4) return BulkEnergy - GetCoulombEnergy();
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G4double SurfaceEnergy;
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if (G4StatMFParameters::DBetaDT(T) == 0.0) SurfaceEnergy = 0.0;
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else SurfaceEnergy = (5./2.)*std::pow(theA,2.0/3.0)*T*T*
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G4StatMFParameters::GetBeta0()/
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(G4StatMFParameters::GetCriticalTemp()*
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G4StatMFParameters::GetCriticalTemp());
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G4double ExchangeEnergy = theA*T*T/GetInvLevelDensity();
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if (theA != 4) ExchangeEnergy += SurfaceEnergy;
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return BulkEnergy + ExchangeEnergy - GetCoulombEnergy();
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}
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G4double G4StatMFFragment::GetInvLevelDensity(void) const
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{
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// Calculate Inverse Density Level
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// Epsilon0*(1 + 3 /(Af - 1))
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if (theA == 1) return 0.0;
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else return
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G4StatMFParameters::GetEpsilon0()*(1.0+3.0/(theA - 1.0));
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}
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G4Fragment * G4StatMFFragment::GetFragment(const G4double T)
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{
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G4double U = CalcExcitationEnergy(T);
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G4double M = GetNuclearMass();
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G4LorentzVector FourMomentum(_momentum,std::sqrt(_momentum.mag2()+(M+U)*(M+U)));
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G4Fragment * theFragment = new G4Fragment(static_cast<G4int>(theA),static_cast<G4int>(theZ),FourMomentum);
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return theFragment;
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}
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G4double G4StatMFFragment::CalcExcitationEnergy(const G4double T)
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{
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if (theA <= 3) return 0.0;
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G4double BulkEnergy = theA*T*T/GetInvLevelDensity();
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// if it is an alpha particle: done
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if (theA == 4) return BulkEnergy;
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// Term connected with surface energy
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G4double SurfaceEnergy = 0.0;
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if (std::abs(G4StatMFParameters::DBetaDT(T)) > 1.0e-20)
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// SurfaceEnergy = (5./2.)*std::pow(theA,2.0/3.0)*T*T*G4StatMFParameters::GetBeta0()/
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// (G4StatMFParameters::GetCriticalTemp()*G4StatMFParameters::GetCriticalTemp());
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SurfaceEnergy = (5./2.)*std::pow(theA,2.0/3.0)*(G4StatMFParameters::Beta(T) -
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T*G4StatMFParameters::DBetaDT(T) - G4StatMFParameters::GetBeta0());
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return BulkEnergy + SurfaceEnergy;
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}
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