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 | // |
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27 | // $Id: G4PreCompoundNucleon.cc,v 1.13 2009/02/11 18:06:00 vnivanch Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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29 | // |
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30 | // ------------------------------------------------------------------- |
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31 | // |
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32 | // GEANT4 Class file |
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33 | // |
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34 | // |
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35 | // File name: G4PreCompoundNucleon |
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36 | // |
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37 | // Author: V.Lara |
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38 | // |
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39 | // Modified: |
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40 | // 10.02.2009 J. M. Quesada cleanup |
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41 | // |
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42 | |
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43 | #include "G4PreCompoundNucleon.hh" |
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44 | #include "G4PreCompoundParameters.hh" |
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45 | |
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46 | G4bool G4PreCompoundNucleon::IsItPossible(const G4Fragment& aFragment) |
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47 | { |
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48 | G4int pplus = aFragment.GetNumberOfCharged(); |
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49 | G4int pneut = aFragment.GetNumberOfParticles()-pplus; |
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50 | return (pneut >= (GetA()-GetZ()) && pplus >= GetZ()); |
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51 | } |
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52 | |
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53 | G4double G4PreCompoundNucleon:: |
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54 | ProbabilityDistributionFunction(const G4double eKin, |
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55 | const G4Fragment& aFragment) |
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56 | { |
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57 | if ( !IsItPossible(aFragment) ) return 0.0; |
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58 | |
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59 | G4double U = aFragment.GetExcitationEnergy(); |
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60 | G4double P = aFragment.GetNumberOfParticles(); |
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61 | G4double H = aFragment.GetNumberOfHoles(); |
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62 | G4double N = P + H; |
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63 | |
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64 | G4double g0 = (6.0/pi2)*aFragment.GetA() * |
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65 | G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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66 | |
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67 | G4double g1 = (6.0/pi2)*GetRestA() * |
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68 | G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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69 | |
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70 | G4double A0 = ((P*P+H*H+P-H)/4.0 - H/2.0)/g0; |
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71 | |
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72 | G4double A1 = (A0 - P/2.0)/g1; |
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73 | |
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74 | G4double E0 = std::max(0.0,U - A0); |
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75 | if (E0 == 0.0) return 0.0; |
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76 | G4double E1 = std::max(0.0,U - eKin - GetBindingEnergy() - A1); |
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77 | if (E1 == 0.0) return 0.0; |
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78 | |
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79 | |
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80 | G4double Probability = 1.0/pi2*2.0/(hbarc*hbarc*hbarc) * GetReducedMass() |
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81 | * GetRj(aFragment.GetNumberOfParticles(), aFragment.GetNumberOfCharged()) |
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82 | * eKin*CrossSection(eKin)*millibarn * P*(N-1.0) * std::pow(g1*E1/(g0*E0),N-2.0)/E0 * g1/(g0*g0); |
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83 | |
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84 | if (GetRj(aFragment.GetNumberOfParticles(), aFragment.GetNumberOfCharged())<0.0 |
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85 | || CrossSection(eKin) <0) { |
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86 | std::ostringstream errOs; |
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87 | G4cout<<"WARNING: NEGATIVE VALUES "<<G4endl; |
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88 | errOs << "Rj=" << GetRj(aFragment.GetNumberOfParticles(), aFragment.GetNumberOfCharged()) |
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89 | <<G4endl; |
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90 | errOs <<" xsec("<<eKin<<" MeV) ="<<CrossSection(eKin)<<G4endl; |
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91 | errOs <<" A="<<GetA()<<" Z="<<GetZ()<<G4endl; |
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92 | throw G4HadronicException(__FILE__, __LINE__, errOs.str()); |
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93 | } |
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94 | |
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95 | return Probability; |
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96 | } |
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