1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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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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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: G4HETCTriton.cc,v 1.4 2010/08/28 15:16:55 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 | // by V. Lara |
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30 | // |
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31 | // Modified: |
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32 | // 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor |
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33 | // the source, use G4Pow |
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34 | |
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35 | #include "G4HETCTriton.hh" |
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36 | #include "G4Triton.hh" |
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37 | |
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38 | G4HETCTriton::G4HETCTriton() |
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39 | : G4HETCChargedFragment(G4Triton::Triton(), &theTritonCoulombBarrier) |
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40 | {} |
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41 | |
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42 | G4HETCTriton::~G4HETCTriton() |
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43 | {} |
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44 | |
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45 | G4double G4HETCTriton::GetAlpha() |
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46 | { |
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47 | G4double C = 0.0; |
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48 | G4int aZ = GetZ() + GetRestZ(); |
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49 | if (aZ >= 70) |
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50 | { |
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51 | C = 0.10; |
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52 | } |
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53 | else |
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54 | { |
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55 | C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375; |
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56 | } |
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57 | |
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58 | return 1.0 + C/3.0; |
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59 | } |
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60 | |
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61 | G4double G4HETCTriton::GetBeta() |
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62 | { |
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63 | return -GetCoulombBarrier(); |
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64 | } |
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65 | |
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66 | G4double G4HETCTriton::GetSpinFactor() |
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67 | { |
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68 | // 2s+1 |
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69 | return 2.0; |
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70 | } |
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71 | |
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72 | G4double G4HETCTriton::K(const G4Fragment & aFragment) |
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73 | { |
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74 | // Number of protons in emitted fragment |
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75 | G4int Pa = GetZ(); |
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76 | // Number of neutrons in emitted fragment |
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77 | G4int Na = GetA() - Pa; |
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78 | |
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79 | G4int TargetZ = GetRestZ(); |
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80 | G4int TargetA = GetRestA(); |
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81 | G4double r = G4double(TargetZ)/G4double(TargetA); |
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82 | |
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83 | G4int P = aFragment.GetNumberOfParticles(); |
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84 | G4int H = aFragment.GetNumberOfHoles(); |
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85 | |
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86 | G4double result = 0.0; |
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87 | if (P > 2) |
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88 | { |
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89 | result = 3.0/(P*(P-1.0)*(P-2.0)) * |
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90 | (H*(H-1.0)*(H-2.0)*r*(r-1.0)*(r-1.0) + |
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91 | H*(H-1.0)*(2.0*Na*r*(1.0-r)+Pa*(1.0-r)*(1.0-r)) + |
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92 | H*(Na*(Na-1.0)*r+2.0*Na*Pa*(1.0-r)) + |
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93 | Pa*Na*(Na-1.0)); |
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94 | |
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95 | result /= 3.0*r*(1.0 - r)*(1.0 - r); |
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96 | } |
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97 | return std::max(0.0,result); |
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98 | } |
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