Gabriele Cosmo
84 lines
3.5 KiB
Plaintext
84 lines
3.5 KiB
Plaintext
//
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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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// $Id: G4DNAProtonChargeIncreaseTotalCrossSectionPolicy.icc,v 1.4 2006/06/29 19:35:07 gunter Exp $
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// GEANT4 tag $Name: geant4-08-01 $
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//
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#ifdef G4DNAPROTONCHARGEINCREASETOTALCROSSSECTIONPOLICY_HH
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#include "Randomize.hh"
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template <typename IncomingParticlePolicy, typename EnergyLimitsPolicy>
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G4double G4DNAProtonChargeIncreaseTotalCrossSectionPolicy<IncomingParticlePolicy, EnergyLimitsPolicy> :: TotalCrossSection(G4double k, G4int z) const
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{
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if (k < EnergyLimitsPolicy::lowEnergyLimit)
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{
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if (EnergyLimitsPolicy::zeroBelowLowEnergyLimit)
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return 0;
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k=EnergyLimitsPolicy::lowEnergyLimit;
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}
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else if (k > EnergyLimitsPolicy::highEnergyLimit)
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{
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if (EnergyLimitsPolicy::zeroAboveHighEnergyLimit)
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return 0;
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k=EnergyLimitsPolicy::highEnergyLimit;
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}
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G4double dummy;//Only a dummy
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dummy = z;
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G4double totalCrossSection(0.);
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//--------Following model is proposed by Miller and Green---------
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/*
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const G4double s0 = 1e-20;
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const G4double a = 79.3*keV;
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const G4double omega = 0.652;
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const G4double i = 12.61*eV;
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const G4double nu = 0.943;
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const G4double j = 27.7*keV;
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totalCrossSection = (s0*std::pow(10*a/keV,omega)*std::pow(k/keV-i/keV, nu)) / (std::pow(j/keV,omega+nu) + std::pow(k/keV,omega+nu));*/
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//----------Following model is proposed by Dingfelder--------------
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const G4double aa=2.835;
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const G4double bb=0.310;
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const G4double cc=2.100;
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const G4double dd=0.760;
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const G4double fac=1.0e-18;
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const G4double rr=13.606*eV;
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G4double t = k / (proton_mass_c2/electron_mass_c2);
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G4double x = t / rr;
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G4double sigmal = 4.0*pi*Bohr_radius/nm*Bohr_radius/nm*fac*cc*(std::pow(x,dd));
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G4double sigmah = 4.0*pi*Bohr_radius/nm*Bohr_radius/nm*fac*(aa*std::log(1.0+x)+bb)/x;
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totalCrossSection = 1.0/(1.0/sigmal + 1.0/sigmah);
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return totalCrossSection*m*m;
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}
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#endif /* G4DNAPROTONCHARGEINCREASETOTALCROSSSECTIONPOLICY_HH */
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