Gabriele Cosmo
148 lines
5.8 KiB
C++
148 lines
5.8 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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// 18-Sep-2003 First version is written by T. Koi
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// 10-Nov-2003 Bug fix at Cal. ke_per_n and D T. Koi
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// 12-Nov-2003 Add energy check at lower side T. Koi
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// 26-Dec-2006 Add isotope dependence D. Wright
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// 14-Mar-2011 Moved constructor, destructor and virtual methods to source by V.Ivanchenko
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// 19-Aug-2011 V.Ivanchenko move to new design and make x-section per element
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#include "G4IonsKoxCrossSection.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4DynamicParticle.hh"
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#include "G4NucleiProperties.hh"
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#include "G4HadTmpUtil.hh"
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#include "G4NistManager.hh"
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G4IonsKoxCrossSection::G4IonsKoxCrossSection()
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: G4VCrossSectionDataSet("IonsKox"),
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// lowerLimit ( 10*MeV ),
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r0 ( 1.1*fermi ), rc ( 1.3*fermi )
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{}
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G4IonsKoxCrossSection::~G4IonsKoxCrossSection()
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{}
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void
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G4IonsKoxCrossSection::CrossSectionDescription(std::ostream& outFile) const
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{
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outFile << "G4IonsKoxCrossSection calculates the total reaction cross\n"
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<< "section for nucleus-nucleus scattering using the Kox\n"
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<< "parameterization. It is valid for projectiles and targets\n"
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<< "of all Z, at projectile energies up to 10 GeV/n. If the\n"
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<< "projectile energy is less than 10 MeV/n, a zero cross section\n"
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<< "is returned.\n";
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}
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G4bool G4IonsKoxCrossSection::IsElementApplicable(const G4DynamicParticle* aDP,
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G4int, const G4Material*)
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{
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return (1 <= aDP->GetDefinition()->GetBaryonNumber());
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}
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G4double
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G4IonsKoxCrossSection::GetElementCrossSection(
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const G4DynamicParticle* aParticle, G4int ZZ, const G4Material*)
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{
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G4double xsection = 0.0;
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G4int Ap = aParticle->GetDefinition()->GetBaryonNumber();
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G4int Zp = G4int(aParticle->GetDefinition()->GetPDGCharge() / eplus + 0.5);
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G4double ke_per_N = aParticle->GetKineticEnergy() / Ap;
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// Apply energy check, if less than lower limit then 0 value is returned
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// if ( ke_per_N < lowerLimit ) return xsection;
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G4int At = G4lrint(G4NistManager::Instance()->GetAtomicMassAmu(ZZ));
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G4int Zt = ZZ;
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G4double one_third = 1.0 / 3.0;
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G4double cubicrAt = G4Pow::GetInstance()->powA ( G4double(At) , G4double(one_third) );
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G4double cubicrAp = G4Pow::GetInstance()->powA ( G4double(Ap) , G4double(one_third) );
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// rc divide fermi
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G4double Bc = Zt * Zp / ( (rc/fermi) * (cubicrAp+cubicrAt) );
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G4double targ_mass = G4NucleiProperties::GetNuclearMass(At, Zt);
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G4double proj_mass = aParticle->GetMass();
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G4double proj_momentum = aParticle->GetMomentum().mag();
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G4double Ecm = calEcm ( proj_mass , targ_mass , proj_momentum );
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if( Ecm <= Bc) return xsection;
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G4double Rvol = r0 * ( cubicrAp + cubicrAt );
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// G4double ke_per_N = aParticle->GetKineticEnergy() / Ap;
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G4double c = calCeValue ( ke_per_N / MeV );
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G4double a = 1.85;
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G4double Rsurf = r0 * (a*cubicrAp * cubicrAt/(cubicrAp + cubicrAt) - c);
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G4double D = 5.0 * ( At - 2 * Zt ) * Zp / ( Ap * At );
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Rsurf = Rsurf + D * fermi; // multiply D by fermi
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G4double Rint = Rvol + Rsurf;
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xsection = pi * Rint * Rint * ( 1 - Bc / ( Ecm / MeV ) );
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return xsection;
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}
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G4double
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G4IonsKoxCrossSection::calEcm(G4double mp, G4double mt, G4double Plab)
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{
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G4double Elab = std::sqrt ( mp * mp + Plab * Plab );
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G4double Ecm = std::sqrt ( mp * mp + mt * mt + 2 * Elab * mt );
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G4double Pcm = Plab * mt / Ecm;
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G4double KEcm = std::sqrt ( Pcm * Pcm + mp * mp ) - mp;
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return KEcm;
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}
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G4double G4IonsKoxCrossSection::calCeValue(const G4double ke)
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{
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// Calculate c value
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// This value is indepenent from projectile and target particle
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// ke is projectile kinetic energy per nucleon in the Lab system with MeV unit
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// fitting function is made by T. Koi
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// There are no data below 30 MeV/n in Kox et al.,
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G4double Ce;
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G4double log10_ke = std::log10 ( ke );
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if (log10_ke > 1.5)
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{
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Ce = - 10.0 / G4Pow::GetInstance()->powA ( G4double(log10_ke) , G4double(5) ) + 2.0;
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}
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else
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{
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Ce = (-10.0/G4Pow::GetInstance()->powA(G4double(1.5), G4double(5) ) + 2.0) /
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G4Pow::GetInstance()->powA(G4double(1.5), G4double(3)) * G4Pow::GetInstance()->powA(G4double(log10_ke), G4double(3) );
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}
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return Ce;
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}
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