Gabriele Cosmo
142 lines
5.6 KiB
C++
142 lines
5.6 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4PhotoNuclearCrossSection.hh,v 1.7 2002/12/12 19:16:49 gunter Exp $
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// GEANT4 tag $Name: geant4-05-00 $
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//
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//
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// GEANT4 physics class: G4PhotoNuclearCrossSection -- header file
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// Created: M.V. Kossov, CERN/ITEP(Moscow), 10-OCT-01
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// The last update: M.V. Kossov, CERN/ITEP (Moscow) 17-May-02
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//
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#ifndef G4PhotoNuclearCrossSection_h
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#define G4PhotoNuclearCrossSection_h 1
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#include "G4VCrossSectionDataSet.hh"
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/////////#include "G4HadronCrossSections.hh"
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#include "G4DynamicParticle.hh"
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#include "G4Element.hh"
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//#include "G4QPDGCode.hh"
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#include "G4ParticleTable.hh"
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#include "G4NucleiProperties.hh"
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#include "G4NucleiPropertiesTable.hh"
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#include "g4std/vector"
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class G4PhotoNuclearCrossSection : public G4VCrossSectionDataSet
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{
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public:
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G4PhotoNuclearCrossSection() // Constructor @@??
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{
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//theHadronCrossSections = G4HadronCrossSections::Instance();
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}
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~G4PhotoNuclearCrossSection() {}
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G4bool IsApplicable(const G4DynamicParticle* aParticle, const G4Element* anElement)
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{
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//return theHadronCrossSections->IsApplicable(aParticle, anElement);
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// Possible prototype
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G4bool result = false;
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if( aParticle->GetDefinition()->GetPDGEncoding()==22) result = true;
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return result;
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}
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G4double GetCrossSection(const G4DynamicParticle* aParticle, const G4Element* anElement,
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G4double T=0.);
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//{
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// return theHadronCrossSections->GetInelasticCrossSection(aParticle,
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// anElement);
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//}
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void BuildPhysicsTable(const G4ParticleDefinition&) {}
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void DumpPhysicsTable(const G4ParticleDefinition&) {}
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private:
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G4int GetFunctions(G4double a, G4double* y, G4double* z);
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//G4double LinearFit(G4double X, G4int N, const G4double* XN, const G4double* YN);
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G4double EquLinearFit(G4double X, G4int N,const G4double X0,const G4double XD, const G4double* Y);
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G4double ThresholdEnergy(G4int Z, G4int N);
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// Body
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private:
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static G4int lastN; // The last N of calculated nucleus
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static G4int lastZ; // The last Z of calculated nucleus
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static G4double lastSig; // Last value of the Cross Section
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static G4double* lastGDR; // Pointer to the last array of GDR cross sections
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static G4double* lastHEN; // Pointer to the last array of HEn cross sections
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static G4double lastE; // Last used in the cross section Energy
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static G4double lastTH; // Last value of the Energy Threshold (A-dependent)
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static G4double lastSP; // Last value of the ShadowingPomeron (A-dependent)
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//G4HadronCrossSections* theHadronCrossSections;
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};
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// Gives the threshold energy for different nuclei (min of p- and n-threshold)
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inline G4double G4PhotoNuclearCrossSection::ThresholdEnergy(G4int Z, G4int N)
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{
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// CHIPS - Direct GEANT
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//static const G4double mNeut = G4QPDGCode(2112).GetMass();
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//static const G4double mProt = G4QPDGCode(2212).GetMass();
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static const G4double mNeut = G4NucleiProperties::GetNuclearMass(1,0);
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static const G4double mProt = G4NucleiProperties::GetNuclearMass(1,1);
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// ---------
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static const G4double infEn = 9.e27;
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G4int A=Z+N;
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if(A<1) return infEn;
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else if(A==1) return 134.9766; // Pi0 threshold for the nucleon
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// CHIPS - Direct GEANT
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//G4double mT= G4QPDGCode(111).GetNuclMass(Z,N,0);
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G4double mT= 0.;
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if(G4NucleiPropertiesTable::IsInTable(Z,A)) mT=G4NucleiProperties::GetNuclearMass(A,Z);
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else
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{
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G4cerr<<"G4PhotoNucCrossSect.hh::ThreshEn:Z="<<Z<<",A="<<A<<" element isn't in G4NucPr"<<G4endl;
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return 0.; // If it is not in the Table of Stable Nuclei, then the Threshold=inf
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}
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// ---------
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G4double mP= infEn;
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//if(Z) mP= G4QPDGCode(111).GetNuclMass(Z-1,N,0);
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if(Z&&G4NucleiPropertiesTable::IsInTable(Z-1,A-1)) mP=G4NucleiProperties::GetNuclearMass(A-1,Z-1);
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else
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{
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G4cerr<<"G4PhotoNucCrossSect.hh::ThrEn:Z="<<Z-1<<",A="<<A-1<<" element isn't in G4NucP"<<G4endl;
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}
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G4double mN= infEn;
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//if(N) mN= G4QPDGCode(111).GetNuclMass(Z,N-1,0);
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if(N&&G4NucleiPropertiesTable::IsInTable(Z,A-1)) mN=G4NucleiProperties::GetNuclearMass(A-1,Z);
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else
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{
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G4cerr<<"G4PhotoNucCrossSect.hh::ThreshEn:Z="<<Z<<",A="<<A-1<<" element isn't in G4NuP"<<G4endl;
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}
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G4double dP= mP+mProt-mT;
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G4double dN= mN+mNeut-mT;
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if(dP<dN)dN=dP;
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return dN;
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}
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#endif
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