1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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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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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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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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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 | // $Id: G4GNASHTransitions.cc,v 1.6 2010/08/20 07:42:19 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
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28 | // |
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29 | // 20.08.2010 V.Ivanchenko move constructor and destructor to the source |
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30 | |
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31 | #include "G4GNASHTransitions.hh" |
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32 | #include "G4PreCompoundParameters.hh" |
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33 | #include "G4HadronicException.hh" |
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34 | |
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35 | G4GNASHTransitions::G4GNASHTransitions() |
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36 | {} |
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37 | |
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38 | G4GNASHTransitions::~G4GNASHTransitions() |
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39 | {} |
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40 | |
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41 | G4double G4GNASHTransitions:: |
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42 | CalculateProbability(const G4Fragment & aFragment) |
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43 | { |
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44 | const G4double k = 135.0 * MeV*MeV*MeV; |
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45 | G4double E = aFragment.GetExcitationEnergy(); |
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46 | G4double P = aFragment.GetNumberOfParticles(); |
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47 | G4double H = aFragment.GetNumberOfHoles(); |
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48 | G4double N = P + H; |
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49 | G4double A = aFragment.GetA(); |
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50 | |
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51 | G4double theMatrixElement(k*N/(A*A*A*E)); |
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52 | G4double x = E/N; |
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53 | if ( x < 2.0*MeV ) theMatrixElement *= x/std::sqrt(14.0*MeV*MeV); |
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54 | else if ( x < 7.0*MeV ) x *= std::sqrt(x/7.0*MeV); |
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55 | else if ( x < 15.0*MeV ) ; |
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56 | else x *= std::sqrt(15.0*MeV/x); |
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57 | |
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58 | // g = (6.0/pi2)*a*A |
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59 | G4double g = (6.0/pi2)*G4PreCompoundParameters::GetAddress()->GetLevelDensity()*A; |
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60 | |
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61 | G4double Epauli = ((P+1.0)*(P+1.0) + (H+1.0)*(H+1.0) + (P+1.0) - 3.0*(H-1.0))/4.0; |
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62 | |
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63 | G4double Probability = g*g*g *(E-Epauli)*(E-Epauli); |
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64 | Probability /= 2.0*(N+1.0)*h_Planck; |
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65 | Probability *= theMatrixElement; |
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66 | |
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67 | return Probability; |
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68 | } |
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69 | |
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70 | void G4GNASHTransitions::PerformTransition(G4Fragment & result) |
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71 | { |
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72 | result.SetNumberOfParticles(result.GetNumberOfParticles()+1); |
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73 | result.SetNumberOfHoles(result.GetNumberOfHoles()+1); |
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74 | if (G4UniformRand() <= result.GetZ()/result.GetA()) |
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75 | { |
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76 | result.SetNumberOfCharged(result.GetNumberOfCharged()+1); |
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77 | } |
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78 | |
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79 | if (result.GetNumberOfParticles() < result.GetNumberOfCharged()) |
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80 | { |
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81 | result.SetNumberOfCharged(result.GetNumberOfParticles()); |
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82 | } |
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83 | } |
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