Gabriele Cosmo
172 lines
5.4 KiB
C++
172 lines
5.4 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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// -------------------------------------------------------------------
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// GEANT4 Class file
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//
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// For information related to this code contact:
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//
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// File name: G4CrossSectionPatch
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//
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// Author:
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//
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// Creation date: 15 April 1999
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//
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// Modifications:
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//
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// -------------------------------------------------------------------
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#include "globals.hh"
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#include "G4CrossSectionPatch.hh"
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#include "G4VCrossSectionSource.hh"
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#include "G4KineticTrack.hh"
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#include "G4CrossSectionVector.hh"
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G4CrossSectionPatch::G4CrossSectionPatch()
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{ }
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G4CrossSectionPatch::~G4CrossSectionPatch()
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{ }
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G4bool G4CrossSectionPatch::operator==(const G4CrossSectionPatch &right) const
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{
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return (this == (G4CrossSectionPatch*) &right);
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}
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G4bool G4CrossSectionPatch::operator!=(const G4CrossSectionPatch &right) const
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{
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return (this != (G4CrossSectionPatch*) &right);
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}
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G4double G4CrossSectionPatch::CrossSection(const G4KineticTrack& trk1,
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const G4KineticTrack& trk2) const
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{
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// The cross section is provided by one of the components, according to their energy
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// validity range
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G4double crossSection = 0.;
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G4double ecm = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
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const G4CrossSectionVector* components = GetComponents();
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if (components != 0)
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{
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std::size_t nComponents = this->GetComponents()->size();
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for (std::size_t i=0; i<nComponents; ++i)
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{
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G4CrossSectionSourcePtr componentPtr = (*components)[i];
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G4VCrossSectionSource* component = componentPtr();
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if (component->IsValid(ecm))
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{
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crossSection = component->CrossSection(trk1,trk2);
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}
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else if (i < (nComponents - 1) )
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{
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G4CrossSectionSourcePtr nextPtr = (*components)[i+1];
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G4VCrossSectionSource* next = nextPtr();
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if (ecm > component->HighLimit() && ecm < next->LowLimit())
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{
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// Merge cross-sections in transition region between two validity ranges
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crossSection = Transition(trk1,trk2,component,next);
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}
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}
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}
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}
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return crossSection;
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}
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G4bool G4CrossSectionPatch::IsValid(G4double e) const
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{
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// The Patch is valid if any of its components are valid
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G4bool answer = false;
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const G4CrossSectionVector* components = GetComponents();
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if (components != 0)
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{
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std::size_t n = components->size();
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for (std::size_t i=0; i<n; ++i)
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{
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G4CrossSectionSourcePtr componentPtr = (*components)[i];
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G4VCrossSectionSource* component = componentPtr();
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if (component->IsValid(e))
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{
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answer = true;
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break;
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}
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}
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}
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return answer;
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}
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G4double G4CrossSectionPatch::Transition(const G4KineticTrack& trk1, const G4KineticTrack& trk2,
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const G4VCrossSectionSource* comp1,
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const G4VCrossSectionSource* comp2) const
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{
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//Merge two cross sections in the transition region between their validity ranges
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G4double crossSection = 0.;
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G4double ecm = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
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G4double sigma1 = comp1->CrossSection(trk1,trk2);
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G4double sigma2 = comp2->CrossSection(trk1,trk2);
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G4double denom = comp2->LowLimit() - comp1->HighLimit();
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G4double diff = ecm - comp1->HighLimit();
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if (denom > 0. && diff > 0.)
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{
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G4double ratio = diff / denom;
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crossSection = (1.- ratio) * sigma1 + ratio * sigma2;
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}
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return crossSection;
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}
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G4double G4CrossSectionPatch::Transition(G4double ecm,
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G4double sigma1, G4double sigma2,
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G4double e1, G4double e2) const
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{
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//Merge two cross sections in the transition region between their validity ranges
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G4double crossSection = 0.;
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G4double denom = e2 - e1;
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G4double diff = ecm - e1;
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if (denom > 0. && diff > 0.)
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{
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G4double ratio = diff / denom;
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crossSection = (1.- ratio) * sigma1 + ratio * sigma2;
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}
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return crossSection;
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}
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