[819] | 1 | // |
---|
| 2 | // ******************************************************************** |
---|
| 3 | // * License and Disclaimer * |
---|
| 4 | // * * |
---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
| 9 | // * include a list of copyright holders. * |
---|
| 10 | // * * |
---|
| 11 | // * Neither the authors of this software system, nor their employing * |
---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
---|
| 13 | // * work make any representation or warranty, express or implied, * |
---|
| 14 | // * regarding this software system or assume any liability for its * |
---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
---|
| 17 | // * * |
---|
| 18 | // * This code implementation is the result of the scientific and * |
---|
| 19 | // * technical work of the GEANT4 collaboration. * |
---|
| 20 | // * * |
---|
| 21 | // * Parts of this code which have been developed by QinetiQ Ltd * |
---|
| 22 | // * under contract to the European Space Agency (ESA) are the * |
---|
| 23 | // * intellectual property of ESA. Rights to use, copy, modify and * |
---|
| 24 | // * redistribute this software for general public use are granted * |
---|
| 25 | // * in compliance with any licensing, distribution and development * |
---|
| 26 | // * policy adopted by the Geant4 Collaboration. This code has been * |
---|
| 27 | // * written by QinetiQ Ltd for the European Space Agency, under ESA * |
---|
| 28 | // * contract 17191/03/NL/LvH (Aurora Programme). * |
---|
| 29 | // * * |
---|
| 30 | // * By using, copying, modifying or distributing the software (or * |
---|
| 31 | // * any work based on the software) you agree to acknowledge its * |
---|
| 32 | // * use in resulting scientific publications, and indicate your * |
---|
| 33 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 34 | // ******************************************************************** |
---|
| 35 | // |
---|
| 36 | // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
---|
| 37 | // |
---|
| 38 | // MODULE: G4EMDissociationSpectrum.cc |
---|
| 39 | // |
---|
| 40 | // Version: B.1 |
---|
| 41 | // Date: 15/04/04 |
---|
| 42 | // Author: P R Truscott |
---|
| 43 | // Organisation: QinetiQ Ltd, UK |
---|
| 44 | // Customer: ESA/ESTEC, NOORDWIJK |
---|
| 45 | // Contract: 17191/03/NL/LvH |
---|
| 46 | // |
---|
| 47 | // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
---|
| 48 | // |
---|
| 49 | // CHANGE HISTORY |
---|
| 50 | // -------------- |
---|
| 51 | // |
---|
| 52 | // 6 October 2003, P R Truscott, QinetiQ Ltd, UK |
---|
| 53 | // Created. |
---|
| 54 | // |
---|
| 55 | // 15 March 2004, P R Truscott, QinetiQ Ltd, UK |
---|
| 56 | // Beta release |
---|
| 57 | // |
---|
| 58 | // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
---|
| 59 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 60 | // |
---|
| 61 | #include "G4EMDissociationSpectrum.hh" |
---|
| 62 | #include "globals.hh" |
---|
| 63 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 64 | // |
---|
| 65 | G4EMDissociationSpectrum::G4EMDissociationSpectrum () |
---|
| 66 | { |
---|
| 67 | bessel = new G4Bessel(); |
---|
| 68 | } |
---|
| 69 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 70 | // |
---|
| 71 | G4EMDissociationSpectrum::~G4EMDissociationSpectrum () |
---|
| 72 | { |
---|
| 73 | delete bessel; |
---|
| 74 | } |
---|
| 75 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 76 | // |
---|
| 77 | G4double G4EMDissociationSpectrum::GetGeneralE1Spectrum |
---|
| 78 | (G4double Eg, G4double b, G4double bmin) |
---|
| 79 | { |
---|
| 80 | G4double b2 = b*b; |
---|
| 81 | G4double g = 1.0/std::sqrt(1.0-b2); |
---|
| 82 | G4double xi = Eg * bmin / g / b / hbarc; |
---|
| 83 | G4double K0 = bessel->K0(xi); |
---|
| 84 | G4double K1 = bessel->K1(xi); |
---|
| 85 | G4double n = 2.0 * fine_structure_const / pi / b2 / Eg * |
---|
| 86 | (xi*K0*K1 - xi*xi*b2/2.0*(K1*K1-K0*K0)); |
---|
| 87 | return n; |
---|
| 88 | } |
---|
| 89 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 90 | // |
---|
| 91 | G4double G4EMDissociationSpectrum::GetGeneralE2Spectrum |
---|
| 92 | (G4double Eg, G4double b, G4double bmin) |
---|
| 93 | { |
---|
| 94 | G4double b2 = b * b; |
---|
| 95 | G4double b4 = b2 * b2; |
---|
| 96 | G4double g = 1.0/std::sqrt(1.0-b2); |
---|
| 97 | G4double xi = Eg * bmin / g / b / hbarc; |
---|
| 98 | G4double K0 = bessel->K0(xi); |
---|
| 99 | G4double K1 = bessel->K1(xi); |
---|
| 100 | G4double n = 2.0 * fine_structure_const / pi / b4 / Eg * |
---|
| 101 | (2.0*(1.0-b2)*K1*K1 + xi*std::pow((2.0-b2),2.0)*K0*K1 - |
---|
| 102 | xi*xi*b4/2.0*(K1*K1-K0*K0)); |
---|
| 103 | return n; |
---|
| 104 | } |
---|
| 105 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 106 | // |
---|
| 107 | G4double G4EMDissociationSpectrum::GetClosestApproach |
---|
| 108 | (const G4double AP, const G4double ZP, G4double AT, G4double ZT, G4double b) |
---|
| 109 | { |
---|
| 110 | G4double bsq = b * b; |
---|
| 111 | G4double g = 1.0/std::sqrt(1-bsq); |
---|
| 112 | G4double AProot3 = std::pow(AP,1.0/3.0); |
---|
| 113 | G4double ATroot3 = std::pow(AT,1.0/3.0); |
---|
| 114 | G4double bc = 1.34 * fermi * (AProot3+ATroot3 - 0.75 *(1.0/AProot3+1.0/ATroot3)); |
---|
| 115 | // G4double a0 = ZP * ZT * classic_electr_radius/bsq; |
---|
| 116 | G4double a0 = ZP * ZT * elm_coupling / (AT*AP*amu_c2/(AT+AP)) / bsq; |
---|
| 117 | G4double bmin = 1.25 * bc + halfpi*a0/g; |
---|
| 118 | return bmin; |
---|
| 119 | } |
---|
| 120 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 121 | // |
---|