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 | // * * |
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21 | // * Parts of this code which have been developed by QinetiQ Ltd * |
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22 | // * under contract to the European Space Agency (ESA) are the * |
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23 | // * intellectual property of ESA. Rights to use, copy, modify and * |
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24 | // * redistribute this software for general public use are granted * |
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25 | // * in compliance with any licensing, distribution and development * |
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26 | // * policy adopted by the Geant4 Collaboration. This code has been * |
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27 | // * written by QinetiQ Ltd for the European Space Agency, under ESA * |
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28 | // * contract 17191/03/NL/LvH (Aurora Programme). * |
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29 | // * * |
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30 | // * By using, copying, modifying or distributing the software (or * |
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31 | // * any work based on the software) you agree to acknowledge its * |
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32 | // * use in resulting scientific publications, and indicate your * |
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33 | // * acceptance of all terms of the Geant4 Software license. * |
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34 | // ******************************************************************** |
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35 | // |
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36 | // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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37 | // |
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38 | // MODULE: G4EMDissociationSpectrum.cc |
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39 | // |
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40 | // Version: B.1 |
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41 | // Date: 15/04/04 |
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42 | // Author: P R Truscott |
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43 | // Organisation: QinetiQ Ltd, UK |
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44 | // Customer: ESA/ESTEC, NOORDWIJK |
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45 | // Contract: 17191/03/NL/LvH |
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46 | // |
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47 | // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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48 | // |
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49 | // CHANGE HISTORY |
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50 | // -------------- |
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51 | // |
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52 | // 6 October 2003, P R Truscott, QinetiQ Ltd, UK |
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53 | // Created. |
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54 | // |
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55 | // 15 March 2004, P R Truscott, QinetiQ Ltd, UK |
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56 | // Beta release |
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57 | // |
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58 | // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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59 | //////////////////////////////////////////////////////////////////////////////// |
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60 | // |
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61 | #include "G4EMDissociationSpectrum.hh" |
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62 | #include "globals.hh" |
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63 | //////////////////////////////////////////////////////////////////////////////// |
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64 | // |
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65 | G4EMDissociationSpectrum::G4EMDissociationSpectrum () |
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66 | { |
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67 | bessel = new G4Bessel(); |
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68 | } |
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69 | //////////////////////////////////////////////////////////////////////////////// |
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70 | // |
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71 | G4EMDissociationSpectrum::~G4EMDissociationSpectrum () |
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72 | { |
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73 | delete bessel; |
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74 | } |
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75 | //////////////////////////////////////////////////////////////////////////////// |
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76 | // |
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77 | G4double G4EMDissociationSpectrum::GetGeneralE1Spectrum |
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78 | (G4double Eg, G4double b, G4double bmin) |
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79 | { |
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80 | G4double b2 = b*b; |
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81 | G4double g = 1.0/std::sqrt(1.0-b2); |
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82 | G4double xi = Eg * bmin / g / b / hbarc; |
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83 | G4double K0 = bessel->K0(xi); |
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84 | G4double K1 = bessel->K1(xi); |
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85 | G4double n = 2.0 * fine_structure_const / pi / b2 / Eg * |
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86 | (xi*K0*K1 - xi*xi*b2/2.0*(K1*K1-K0*K0)); |
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87 | return n; |
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88 | } |
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89 | //////////////////////////////////////////////////////////////////////////////// |
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90 | // |
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91 | G4double G4EMDissociationSpectrum::GetGeneralE2Spectrum |
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92 | (G4double Eg, G4double b, G4double bmin) |
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93 | { |
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94 | G4double b2 = b * b; |
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95 | G4double b4 = b2 * b2; |
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96 | G4double g = 1.0/std::sqrt(1.0-b2); |
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97 | G4double xi = Eg * bmin / g / b / hbarc; |
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98 | G4double K0 = bessel->K0(xi); |
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99 | G4double K1 = bessel->K1(xi); |
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100 | G4double n = 2.0 * fine_structure_const / pi / b4 / Eg * |
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101 | (2.0*(1.0-b2)*K1*K1 + xi*std::pow((2.0-b2),2.0)*K0*K1 - |
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102 | xi*xi*b4/2.0*(K1*K1-K0*K0)); |
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103 | return n; |
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104 | } |
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105 | //////////////////////////////////////////////////////////////////////////////// |
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106 | // |
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107 | G4double G4EMDissociationSpectrum::GetClosestApproach |
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108 | (const G4double AP, const G4double ZP, G4double AT, G4double ZT, G4double b) |
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109 | { |
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110 | G4double bsq = b * b; |
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111 | G4double g = 1.0/std::sqrt(1-bsq); |
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112 | G4double AProot3 = std::pow(AP,1.0/3.0); |
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113 | G4double ATroot3 = std::pow(AT,1.0/3.0); |
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114 | G4double bc = 1.34 * fermi * (AProot3+ATroot3 - 0.75 *(1.0/AProot3+1.0/ATroot3)); |
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115 | // G4double a0 = ZP * ZT * classic_electr_radius/bsq; |
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116 | G4double a0 = ZP * ZT * elm_coupling / (AT*AP*amu_c2/(AT+AP)) / bsq; |
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117 | G4double bmin = 1.25 * bc + halfpi*a0/g; |
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118 | return bmin; |
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119 | } |
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120 | //////////////////////////////////////////////////////////////////////////////// |
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121 | // |
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