Gabriele Cosmo
145 lines
5.9 KiB
Plaintext
145 lines
5.9 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: G4DNADingfelderChargeChangeTotalCrossSectionPolicy.icc,v 1.3 2006/06/29 19:33:52 gunter Exp $
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// GEANT4 tag $Name: geant4-08-01 $
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//
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#ifdef G4DNADINGFELDERCHARGECHANGETOTALCROSSSECTIONPOLICY_HH
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#include "Randomize.hh"
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template <typename IncomingParticlePolicy, typename EnergyLimitsPolicy>
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G4double G4DNADingfelderChargeChangeTotalCrossSectionPolicy<IncomingParticlePolicy, EnergyLimitsPolicy> :: TotalCrossSection(G4double k, G4int z)
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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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G4int i(IncomingParticlePolicy::NumberOfPartialCrossSections());
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G4double totalCrossSection(0.);
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while (i>0)
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{
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i--;
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totalCrossSection+=PartialCrossSection(k, z, i);
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}
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return totalCrossSection;
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}
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template <typename IncomingParticlePolicy, typename EnergyLimitsPolicy>
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G4int G4DNADingfelderChargeChangeTotalCrossSectionPolicy<IncomingParticlePolicy, EnergyLimitsPolicy> :: RandomizePartialCrossSection(G4double k, G4int z)
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{
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const G4int n(IncomingParticlePolicy::NumberOfPartialCrossSections());
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G4double * values(new G4double[n]);
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G4double value(0);
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G4int i(n);
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while (i>0)
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{
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i--;
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values[i]=PartialCrossSection(k, z, i);
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value+=values[i];
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}
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value*=G4UniformRand();
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i=n;
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while (i>0)
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{
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i--;
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if (values[i]>value)
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break;
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value-=values[i];
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}
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delete[] values;
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return i;
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}
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template <typename IncomingParticlePolicy, typename EnergyLimitsPolicy>
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G4double G4DNADingfelderChargeChangeTotalCrossSectionPolicy<IncomingParticlePolicy, EnergyLimitsPolicy> :: PartialCrossSection(G4double k, G4int /* z */, G4int index)
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{
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//
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// sigma(T) = f0 10 ^ y(std::log10(T/eV))
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//
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// / a0 x + b0 x < x0
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// |
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// y(x) = < a0 x + b0 - c0 (x - x0)^d0 x0 <= x < x1
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// |
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// \ a1 x + b1 x >= x1
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//
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//
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// f0, a0, a1, b0, b1, c0, d0, x0, x1 are parameters that change for protons and helium (0, +, ++)
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//
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// f0 has been added to the code in order to manage partial (shell-dependent) cross sections (if no shell dependence is present. f0=1. Sum of f0 over the considered shells should give 1)
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//
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// From Rad. Phys. and Chem. 59 (2000) 255-275, M. Dingfelder et al.
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// Inelastic-collision cross sections of liquid water for interactions of energetic proton
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//
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if (IncomingParticlePolicy::x1[index]<IncomingParticlePolicy::x0[index])
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{
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//
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// if x1 < x0 means that x1 and b1 will be calculated with the following formula (this piece of code is run on all alphas and not on protons)
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//
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// x1 = x0 + ((a0 - a1)/(c0 * d0)) ^ (1 / (d0 - 1))
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//
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// b1 = (a0 - a1) * x1 + b0 - c0 * (x1 - x0) ^ d0
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//
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IncomingParticlePolicy::x1[index]=IncomingParticlePolicy::x0[index] + std::pow((IncomingParticlePolicy::a0[index] - IncomingParticlePolicy::a1[index]) / (IncomingParticlePolicy::c0[index] * IncomingParticlePolicy::d0[index]), 1. / (IncomingParticlePolicy::d0[index] - 1.));
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IncomingParticlePolicy::b1[index]=(IncomingParticlePolicy::a0[index] - IncomingParticlePolicy::a1[index]) * IncomingParticlePolicy::x1[index] + IncomingParticlePolicy::b0[index] - IncomingParticlePolicy::c0[index] * std::pow(IncomingParticlePolicy::x1[index] - IncomingParticlePolicy::x0[index], IncomingParticlePolicy::d0[index]);
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}
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G4double x(std::log10(k/eV));
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G4double y;
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if (x<IncomingParticlePolicy::x0[index])
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y=IncomingParticlePolicy::a0[index] * x + IncomingParticlePolicy::b0[index];
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else if (x<IncomingParticlePolicy::x1[index])
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y=IncomingParticlePolicy::a0[index] * x + IncomingParticlePolicy::b0[index] - IncomingParticlePolicy::c0[index] * std::pow(x - IncomingParticlePolicy::x0[index], IncomingParticlePolicy::d0[index]);
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else
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y=IncomingParticlePolicy::a1[index] * x + IncomingParticlePolicy::b1[index];
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return IncomingParticlePolicy::f0[index] * std::pow(10., y)*m*m;
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}
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#endif /* G4DNADINGFELDERCHARGECHANGETOTALCROSSSECTIONPOLICY_HH */
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