1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // by V. Lara |
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27 | |
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28 | #include "G4PreCompoundIon.hh" |
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29 | #include "G4PreCompoundParameters.hh" |
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30 | //#include "G4EvaporationLevelDensityParameter.hh" |
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31 | |
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32 | |
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33 | G4double G4PreCompoundIon:: |
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34 | ProbabilityDistributionFunction(const G4double eKin, |
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35 | const G4Fragment& aFragment) |
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36 | { |
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37 | if ( !IsItPossible(aFragment) ) return 0.0; |
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38 | |
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39 | const G4double r0 = G4PreCompoundParameters::GetAddress()->Getr0(); |
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40 | |
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41 | G4double U = aFragment.GetExcitationEnergy(); |
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42 | G4double P = aFragment.GetNumberOfParticles(); |
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43 | G4double H = aFragment.GetNumberOfHoles(); |
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44 | G4double N = P + H; |
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45 | |
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46 | // g = (6.0/pi2)*a*A |
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47 | // G4EvaporationLevelDensityParameter theLDP; |
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48 | G4double g0 = (6.0/pi2)*aFragment.GetA() * |
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49 | G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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50 | // theLDP.LevelDensityParameter(static_cast<G4int>(aFragment.GetA()),static_cast<G4int>(aFragment.GetZ()),U); |
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51 | G4double g1 = (6.0/pi2)*GetRestA() * |
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52 | G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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53 | // theLDP.LevelDensityParameter(GetRestA(),GetRestZ(),U); |
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54 | //no longer used: G4double gj = (6.0/pi2)*GetA() * |
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55 | // -----"----- G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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56 | // theLDP.LevelDensityParameter(GetA(),GetZ(),U); |
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57 | |
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58 | G4double A0 = ((P*P+H*H+P-H)/4.0 - H/2.0)/g0; |
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59 | G4double A1 = std::max(0.0,(A0*g0 + GetA()*(GetA()-2.0*P-1.0)/4.0)/g1); |
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60 | G4double Aj = GetA()*(GetA()+1.0)/4.0; |
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61 | |
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62 | G4double E0 = std::max(0.0,U - A0); |
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63 | if (E0 == 0.0) return 0.0; |
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64 | // G4double E1 = std::max(0.0,GetMaximalKineticEnergy() + GetCoulombBarrier() - eKin - A1); |
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65 | G4double E1 = (std::max(0.0,GetMaximalKineticEnergy() - eKin - A1))/g1; //JMQ fix |
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66 | // G4double Ej = std::max(0.0,U + GetBindingEnergy() - Aj); |
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67 | G4double Ej = std::max(0.0,eKin + GetBindingEnergy() - Aj); //JMQ fix |
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68 | |
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69 | G4double pA = (3.0/4.0) * std::sqrt(std::max(0.0, 2.0/(GetReducedMass()*(eKin+GetBindingEnergy()))))* |
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70 | GetAlpha()*(eKin+GetBeta())/(r0*std::pow(GetRestA(),1.0/3.0)) * |
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71 | CoalescenceFactor(aFragment.GetA()) * FactorialFactor(N,P); |
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72 | |
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73 | G4double pB = std::pow((g1*E1)/(g0*E0),N-GetA()-1.0)*(g1/g0); |
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74 | |
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75 | // G4double pC = std::pow((gj*Ej)/(g0*E0),GetA()-1.0)*(gj/g0)/E0; |
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76 | G4double pC = std::pow((g1*Ej)/(g0*E0),GetA()-1.0)*(g1/g0)/E0; //JMQ fix |
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77 | |
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78 | G4double Probability = pA * pB * pC * GetRj(aFragment.GetNumberOfParticles(), aFragment.GetNumberOfCharged()); |
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79 | |
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80 | return Probability; |
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81 | } |
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