Gabriele Cosmo
149 lines
5.4 KiB
C++
149 lines
5.4 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
// 18-Sep-2003 First version is written by T. Koi
|
|
// 10-Nov-2003 Bug fix at Cal. ke_per_n and D T. Koi
|
|
// 12-Nov-2003 Add energy check at lower side T. Koi
|
|
// 26-Dec-2006 Add isotope dependence D. Wright
|
|
|
|
#include "G4IonsKoxCrossSection.hh"
|
|
#include "G4ParticleTable.hh"
|
|
#include "G4IonTable.hh"
|
|
#include "G4HadTmpUtil.hh"
|
|
|
|
G4double G4IonsKoxCrossSection::
|
|
GetZandACrossSection(const G4DynamicParticle* aParticle, G4int ZZ,
|
|
G4int AA, G4double /*temperature*/)
|
|
{
|
|
G4double xsection = 0.0;
|
|
|
|
G4int Ap = aParticle->GetDefinition()->GetBaryonNumber();
|
|
G4int Zp = G4int(aParticle->GetDefinition()->GetPDGCharge() / eplus + 0.5);
|
|
G4double ke_per_N = aParticle->GetKineticEnergy() / Ap;
|
|
|
|
// Apply energy check, if less than lower limit then 0 value is returned
|
|
// if ( ke_per_N < lowerLimit ) return xsection;
|
|
|
|
G4int At = AA;
|
|
G4int Zt = ZZ;
|
|
|
|
G4double one_third = 1.0 / 3.0;
|
|
|
|
G4double cubicrAt = std::pow ( G4double(At) , G4double(one_third) );
|
|
G4double cubicrAp = std::pow ( G4double(Ap) , G4double(one_third) );
|
|
|
|
// rc divide fermi
|
|
G4double Bc = Zt * Zp / ( (rc/fermi) * (cubicrAp+cubicrAt) );
|
|
|
|
G4double targ_mass =
|
|
G4ParticleTable::GetParticleTable()->GetIonTable()->GetIonMass(Zt, At);
|
|
G4double proj_mass = aParticle->GetMass();
|
|
G4double proj_momentum = aParticle->GetMomentum().mag();
|
|
|
|
G4double Ecm = calEcm ( proj_mass , targ_mass , proj_momentum );
|
|
if( Ecm <= Bc) return xsection;
|
|
|
|
G4double Rvol = r0 * ( cubicrAp + cubicrAt );
|
|
|
|
// G4double ke_per_N = aParticle->GetKineticEnergy() / Ap;
|
|
G4double c = calCeValue ( ke_per_N / MeV );
|
|
|
|
G4double a = 1.85;
|
|
G4double Rsurf = r0 * (a*cubicrAp * cubicrAt/(cubicrAp + cubicrAt) - c);
|
|
G4double D = 5.0 * ( At - 2 * Zt ) * Zp / ( Ap * At );
|
|
Rsurf = Rsurf + D * fermi; // multiply D by fermi
|
|
|
|
G4double Rint = Rvol + Rsurf;
|
|
xsection = pi * Rint * Rint * ( 1 - Bc / ( Ecm / MeV ) );
|
|
|
|
return xsection;
|
|
}
|
|
|
|
|
|
G4double G4IonsKoxCrossSection::
|
|
GetCrossSection(const G4DynamicParticle* aParticle,
|
|
const G4Element* anElement, G4double temperature)
|
|
{
|
|
G4int nIso = anElement->GetNumberOfIsotopes();
|
|
G4double xsection = 0;
|
|
|
|
if (nIso) {
|
|
G4double sig;
|
|
G4IsotopeVector* isoVector = anElement->GetIsotopeVector();
|
|
G4double* abundVector = anElement->GetRelativeAbundanceVector();
|
|
G4int ZZ;
|
|
G4int AA;
|
|
|
|
for (G4int i = 0; i < nIso; i++) {
|
|
ZZ = (*isoVector)[i]->GetZ();
|
|
AA = (*isoVector)[i]->GetN();
|
|
sig = GetZandACrossSection(aParticle, ZZ, AA, temperature);
|
|
xsection += sig*abundVector[i];
|
|
}
|
|
|
|
} else {
|
|
G4int ZZ = G4lrint(anElement->GetZ());
|
|
G4int AA = G4lrint(anElement->GetN());
|
|
xsection = GetZandACrossSection(aParticle, ZZ, AA, temperature);
|
|
}
|
|
|
|
return xsection;
|
|
}
|
|
|
|
|
|
G4double
|
|
G4IonsKoxCrossSection::calEcm(G4double mp, G4double mt, G4double Plab)
|
|
{
|
|
G4double Elab = std::sqrt ( mp * mp + Plab * Plab );
|
|
G4double Ecm = std::sqrt ( mp * mp + mt * mt + 2 * Elab * mt );
|
|
G4double Pcm = Plab * mt / Ecm;
|
|
G4double KEcm = std::sqrt ( Pcm * Pcm + mp * mp ) - mp;
|
|
return KEcm;
|
|
}
|
|
|
|
|
|
G4double G4IonsKoxCrossSection::calCeValue(const G4double ke)
|
|
{
|
|
// Calculate c value
|
|
// This value is indepenent from projectile and target particle
|
|
// ke is projectile kinetic energy per nucleon in the Lab system with MeV unit
|
|
// fitting function is made by T. Koi
|
|
// There are no data below 30 MeV/n in Kox et al.,
|
|
|
|
G4double Ce;
|
|
G4double log10_ke = std::log10 ( ke );
|
|
if (log10_ke > 1.5)
|
|
{
|
|
Ce = - 10.0 / std::pow ( G4double(log10_ke) , G4double(5) ) + 2.0;
|
|
}
|
|
else
|
|
{
|
|
Ce = (-10.0/std::pow(G4double(1.5), G4double(5) ) + 2.0) /
|
|
std::pow(G4double(1.5), G4double(3)) * std::pow(G4double(log10_ke), G4double(3) );
|
|
|
|
}
|
|
return Ce;
|
|
}
|