Gabriele Cosmo
369 lines
14 KiB
C++
369 lines
14 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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// The lust update: M.V. Kossov, CERN/ITEP(Moscow) 17-June-02
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//
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// ****************************************************************************************
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// Short description: Cross-sections extracted (by W.Pokorski) from the CHIPS package for
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// Hyperon-nuclear interactions. Original author: M. Kossov
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// -------------------------------------------------------------------------------------
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//
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#include "G4ChipsHyperonInelasticXS.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4DynamicParticle.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4Lambda.hh"
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#include "G4SigmaPlus.hh"
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#include "G4SigmaMinus.hh"
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#include "G4SigmaZero.hh"
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#include "G4XiMinus.hh"
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#include "G4XiZero.hh"
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#include "G4OmegaMinus.hh"
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// factory
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#include "G4CrossSectionFactory.hh"
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//
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G4_DECLARE_XS_FACTORY(G4ChipsHyperonInelasticXS);
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G4ChipsHyperonInelasticXS::G4ChipsHyperonInelasticXS():G4VCrossSectionDataSet(Default_Name())
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{
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// Initialization of the
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lastLEN=0; // Pointer to the lastArray of LowEn CS
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lastHEN=0; // Pointer to the lastArray of HighEn CS
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lastN=0; // The last N of calculated nucleus
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lastZ=0; // The last Z of calculated nucleus
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lastP=0.; // Last used in cross section Momentum
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lastTH=0.; // Last threshold momentum
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lastCS=0.; // Last value of the Cross Section
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lastI=0; // The last position in the DAMDB
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LEN = new std::vector<G4double*>;
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HEN = new std::vector<G4double*>;
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}
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G4ChipsHyperonInelasticXS::~G4ChipsHyperonInelasticXS()
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{
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G4int lens=LEN->size();
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for(G4int i=0; i<lens; ++i) delete[] (*LEN)[i];
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delete LEN;
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G4int hens=HEN->size();
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for(G4int i=0; i<hens; ++i) delete[] (*HEN)[i];
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delete HEN;
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}
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G4bool G4ChipsHyperonInelasticXS::IsIsoApplicable(const G4DynamicParticle* Pt, G4int, G4int,
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const G4Element*,
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const G4Material*)
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{
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const G4ParticleDefinition* particle = Pt->GetDefinition();
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if (particle == G4Lambda::Lambda())
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{
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return true;
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}
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else if(particle == G4SigmaPlus::SigmaPlus())
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{
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return true;
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}
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else if(particle == G4SigmaMinus::SigmaMinus())
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{
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return true;
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}
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else if(particle == G4SigmaZero::SigmaZero())
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{
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return true;
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}
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else if(particle == G4XiMinus::XiMinus())
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{
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return true;
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}
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else if(particle == G4XiZero::XiZero())
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{
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return true;
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}
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else if(particle == G4OmegaMinus::OmegaMinus())
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{
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return true;
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}
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return false;
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}
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// The main member function giving the collision cross section (P is in IU, CS is in mb)
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// Make pMom in independent units ! (Now it is MeV)
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G4double G4ChipsHyperonInelasticXS::GetIsoCrossSection(const G4DynamicParticle* Pt, G4int tgZ, G4int A,
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const G4Isotope*,
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const G4Element*,
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const G4Material*)
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{
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G4double pMom=Pt->GetTotalMomentum();
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G4int tgN = A - tgZ;
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G4int pdg = Pt->GetDefinition()->GetPDGEncoding();
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return GetChipsCrossSection(pMom, tgZ, tgN, pdg);
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}
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G4double G4ChipsHyperonInelasticXS::GetChipsCrossSection(G4double pMom, G4int tgZ, G4int tgN, G4int PDG)
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{
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G4bool in=false; // By default the isotope must be found in the AMDB
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if(tgN!=lastN || tgZ!=lastZ) // The nucleus was not the last used isotope
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{
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in = false; // By default the isotope haven't be found in AMDB
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lastP = 0.; // New momentum history (nothing to compare with)
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lastN = tgN; // The last N of the calculated nucleus
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lastZ = tgZ; // The last Z of the calculated nucleus
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lastI = colN.size(); // Size of the Associative Memory DB in the heap
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j = 0; // A#0f records found in DB for this projectile
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if(lastI) for(G4int i=0; i<lastI; i++) // AMDB exists, try to find the (Z,N) isotope
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{
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if(colN[i]==tgN && colZ[i]==tgZ) // Try the record "i" in the AMDB
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{
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lastI=i; // Remember the index for future fast/last use
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lastTH =colTH[i]; // The last THreshold (A-dependent)
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if(pMom<=lastTH)
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{
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return 0.; // Energy is below the Threshold value
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}
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lastP =colP [i]; // Last Momentum (A-dependent)
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lastCS =colCS[i]; // Last CrossSect (A-dependent)
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in = true; // This is the case when the isotop is found in DB
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// Momentum pMom is in IU ! @@ Units
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lastCS=CalculateCrossSection(-1,j,PDG,lastZ,lastN,pMom); // read & update
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if(lastCS<=0. && pMom>lastTH) // Correct the threshold (@@ No intermediate Zeros)
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{
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lastCS=0.;
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lastTH=pMom;
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}
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break; // Go out of the LOOP
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}
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j++; // Increment a#0f records found in DB
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}
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if(!in) // This isotope has not been calculated previously
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{
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//!!The slave functions must provide cross-sections in millibarns (mb) !! (not in IU)
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lastCS=CalculateCrossSection(0,j,PDG,lastZ,lastN,pMom); //calculate & create
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//if(lastCS>0.) // It means that the AMBD was initialized
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//{
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lastTH = 0; //ThresholdEnergy(tgZ, tgN); // The Threshold Energy which is now the last
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colN.push_back(tgN);
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colZ.push_back(tgZ);
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colP.push_back(pMom);
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colTH.push_back(lastTH);
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colCS.push_back(lastCS);
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//} // M.K. Presence of H1 with high threshold breaks the syncronization
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return lastCS*millibarn;
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} // End of creation of the new set of parameters
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else
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{
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colP[lastI]=pMom;
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colCS[lastI]=lastCS;
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}
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} // End of parameters udate
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else if(pMom<=lastTH)
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{
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return 0.; // Momentum is below the Threshold Value -> CS=0
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}
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else // It is the last used -> use the current tables
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{
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lastCS=CalculateCrossSection(1,j,PDG,lastZ,lastN,pMom); // Only read and UpdateDB
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lastP=pMom;
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}
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return lastCS*millibarn;
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}
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// The main member function giving the gamma-A cross section (E in GeV, CS in mb)
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G4double G4ChipsHyperonInelasticXS::CalculateCrossSection(G4int F, G4int I,
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G4int, G4int targZ, G4int targN, G4double Momentum)
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{
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static const G4double THmin=27.; // default minimum Momentum (MeV/c) Threshold
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static const G4double THmiG=THmin*.001; // minimum Momentum (GeV/c) Threshold
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static const G4double dP=10.; // step for the LEN (Low ENergy) table MeV/c
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static const G4double dPG=dP*.001; // step for the LEN (Low ENergy) table GeV/c
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static const G4int nL=105; // A#of LEN points in E (step 10 MeV/c)
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static const G4double Pmin=THmin+(nL-1)*dP; // minP for the HighE part with safety
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static const G4double Pmax=227000.; // maxP for the HEN (High ENergy) part 227 GeV
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static const G4int nH=224; // A#of HEN points in lnE
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static const G4double milP=std::log(Pmin);// Low logarithm energy for the HEN part
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static const G4double malP=std::log(Pmax);// High logarithm energy (each 2.75 percent)
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static const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HEN part
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static const G4double milPG=std::log(.001*Pmin);// Low logarithmEnergy for HEN part GeV/c
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G4double sigma=0.;
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if(F&&I) sigma=0.; // @@ *!* Fake line *!* to use F & I !!!Temporary!!!
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//G4double A=targN+targZ; // A of the target
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if(F<=0) // This isotope was not the last used isotop
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{
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if(F<0) // This isotope was found in DAMDB =-----=> RETRIEVE
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{
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G4int sync=LEN->size();
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if(sync<=I) G4cerr<<"*!*G4QPiMinusNuclCS::CalcCrosSect:Sync="<<sync<<"<="<<I<<G4endl;
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lastLEN=(*LEN)[I]; // Pointer to prepared LowEnergy cross sections
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lastHEN=(*HEN)[I]; // Pointer to prepared High Energy cross sections
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}
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else // This isotope wasn't calculated before => CREATE
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{
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lastLEN = new G4double[nL]; // Allocate memory for the new LEN cross sections
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lastHEN = new G4double[nH]; // Allocate memory for the new HEN cross sections
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// --- Instead of making a separate function ---
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G4double P=THmiG; // Table threshold in GeV/c
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for(G4int k=0; k<nL; k++)
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{
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lastLEN[k] = CrossSectionLin(targZ, targN, P);
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P+=dPG;
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}
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G4double lP=milPG;
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for(G4int n=0; n<nH; n++)
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{
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lastHEN[n] = CrossSectionLog(targZ, targN, lP);
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lP+=dlP;
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}
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// --- End of possible separate function
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// *** The synchronization check ***
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G4int sync=LEN->size();
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if(sync!=I)
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{
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G4cerr<<"***G4QHyperNuclCS::CalcCrossSect: Sinc="<<sync<<"#"<<I<<", Z=" <<targZ
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<<", N="<<targN<<", F="<<F<<G4endl;
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//G4Exception("G4PiMinusNuclearCS::CalculateCS:","39",FatalException,"DBoverflow");
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}
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LEN->push_back(lastLEN); // remember the Low Energy Table
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HEN->push_back(lastHEN); // remember the High Energy Table
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} // End of creation of the new set of parameters
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} // End of parameters udate
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// =--------------------------= NOW the Magic Formula =------------------------------=
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if (Momentum<lastTH) return 0.; // It must be already checked in the interface class
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else if (Momentum<Pmin) // High Energy region
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{
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sigma=EquLinearFit(Momentum,nL,THmin,dP,lastLEN);
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}
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else if (Momentum<Pmax) // High Energy region
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{
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G4double lP=std::log(Momentum);
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sigma=EquLinearFit(lP,nH,milP,dlP,lastHEN);
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}
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else // UHE region (calculation, not frequent)
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{
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G4double P=0.001*Momentum; // Approximation formula is for P in GeV/c
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sigma=CrossSectionFormula(targZ, targN, P, std::log(P));
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}
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if(sigma<0.) return 0.;
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return sigma;
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}
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// Calculation formula for piMinus-nuclear inelastic cross-section (mb) (P in GeV/c)
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G4double G4ChipsHyperonInelasticXS::CrossSectionLin(G4int tZ, G4int tN, G4double P)
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{
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G4double lP=std::log(P);
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return CrossSectionFormula(tZ, tN, P, lP);
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}
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// Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
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G4double G4ChipsHyperonInelasticXS::CrossSectionLog(G4int tZ, G4int tN, G4double lP)
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{
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G4double P=std::exp(lP);
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return CrossSectionFormula(tZ, tN, P, lP);
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}
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// Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
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G4double G4ChipsHyperonInelasticXS::CrossSectionFormula(G4int tZ, G4int tN,
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G4double P, G4double lP)
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{
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G4double sigma=0.;
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if(tZ==1 && !tN) // Hyperon-P interaction from G4QuasiElastRatios
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{
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G4double ld=lP-3.5;
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G4double ld2=ld*ld;
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G4double p2=P*P;
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G4double p4=p2*p2;
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G4double sp=std::sqrt(P);
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G4double El=(.0557*ld2+6.72+99./p2)/(1.+2./sp+2./p4);
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G4double To=(.3*ld2+38.2+900./sp)/(1.+27./sp+3./p4);
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sigma=To-El;
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}
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else if(tZ<97 && tN<152) // General solution
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{
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G4double d=lP-4.2;
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G4double p2=P*P;
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G4double p4=p2*p2;
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G4double sp=std::sqrt(P);
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G4double ssp=std::sqrt(sp);
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G4double a=tN+tZ; // A of the target
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G4double al=std::log(a);
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G4double sa=std::sqrt(a);
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G4double a2=a*a;
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G4double a2s=a2*sa;
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G4double a4=a2*a2;
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G4double a8=a4*a4;
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G4double c=(170.+3600./a2s)/(1.+65./a2s);
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G4double gg=42.*(std::exp(al*0.8)+4.E-8*a4)/(1.+28./a)/(1.+5.E-5*a2);
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G4double e=390.; // Defolt values for deutrons
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G4double r=0.27;
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G4double h=2.E-7;
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G4double t=0.3;
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if(tZ>1 || tN>1)
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{
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e=380.+18.*a2/(1.+a2/60.)/(1.+2.E-19*a8);
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r=0.15;
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h=1.E-8*a2/(1.+a2/17.)/(1.+3.E-20*a8);
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t=(.2+.00056*a2)/(1.+a2*.0006);
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}
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sigma=(c+d*d)/(1.+t/ssp+r/p4)+(gg+e*std::exp(-6.*P))/(1.+h/p4/p4);
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#ifdef pdebug
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G4cout<<"G4QHyperonNucCS::CSForm: A="<<a<<",P="<<P<<",CS="<<sigma<<",c="<<c<<",g="<<gg
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<<",d="<<d<<",r="<<r<<",e="<<e<<",h="<<h<<G4endl;
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#endif
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}
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else
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{
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G4cerr<<"-Warning-G4QHyperonNuclearCroSect::CSForm:*Bad A* Z="<<tZ<<", N="<<tN<<G4endl;
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sigma=0.;
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}
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if(sigma<0.) return 0.;
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return sigma;
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}
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G4double G4ChipsHyperonInelasticXS::EquLinearFit(G4double X, G4int N, G4double X0, G4double DX, G4double* Y)
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{
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if(DX<=0. || N<2)
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{
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G4cerr<<"***G4ChipsHyperonInelasticXS::EquLinearFit: DX="<<DX<<", N="<<N<<G4endl;
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return Y[0];
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}
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G4int N2=N-2;
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G4double d=(X-X0)/DX;
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G4int jj=static_cast<int>(d);
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if (jj<0) jj=0;
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else if(jj>N2) jj=N2;
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d-=jj; // excess
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G4double yi=Y[jj];
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G4double sigma=yi+(Y[jj+1]-yi)*d;
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return sigma;
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}
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