Geant4  10.01
G4EMDissociationSpectrum.cc
Go to the documentation of this file.
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 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
60 //
62 #include "globals.hh"
63 #include "G4PhysicalConstants.hh"
64 #include "G4SystemOfUnits.hh"
66 //
68 {
69  bessel = new G4Bessel();
70 }
72 //
74 {
75  delete bessel;
76 }
78 //
80  (G4double Eg, G4double b, G4double bmin)
81 {
82  G4double b2 = b*b;
83  G4double gg = 1.0/std::sqrt(1.0-b2);
84  G4double xi = Eg * bmin / gg / b / hbarc;
85  G4double K0 = bessel->K0(xi);
86  G4double K1 = bessel->K1(xi);
87  G4double n = 2.0 * fine_structure_const / pi / b2 / Eg *
88  (xi*K0*K1 - xi*xi*b2/2.0*(K1*K1-K0*K0));
89  return n;
90 }
92 //
94  (G4double Eg, G4double b, G4double bmin)
95 {
96  G4double b2 = b * b;
97  G4double b4 = b2 * b2;
98  G4double gg = 1.0/std::sqrt(1.0-b2);
99  G4double xi = Eg * bmin / gg / b / hbarc;
100  G4double K0 = bessel->K0(xi);
101  G4double K1 = bessel->K1(xi);
102  G4double n = 2.0 * fine_structure_const / pi / b4 / Eg *
103  (2.0*(1.0-b2)*K1*K1 + xi*std::pow((2.0-b2),2.0)*K0*K1 -
104  xi*xi*b4/2.0*(K1*K1-K0*K0));
105  return n;
106 }
108 //
110  (const G4double AP, const G4double ZP, G4double AT, G4double ZT, G4double b)
111 {
112  G4double bsq = b * b;
113  G4double gg = 1.0/std::sqrt(1-bsq);
114  G4double AProot3 = std::pow(AP,1.0/3.0);
115  G4double ATroot3 = std::pow(AT,1.0/3.0);
116  G4double bc = 1.34 * fermi * (AProot3+ATroot3 - 0.75 *(1.0/AProot3+1.0/ATroot3));
117 // G4double a0 = ZP * ZT * classic_electr_radius/bsq;
118  G4double a0 = ZP * ZT * elm_coupling / (AT*AP*amu_c2/(AT+AP)) / bsq;
119  G4double bmin = 1.25 * bc + halfpi*a0/gg;
120  return bmin;
121 }
123 //
const G4double a0
const G4double pi
G4double GetGeneralE2Spectrum(G4double, G4double, G4double)
G4double GetGeneralE1Spectrum(G4double, G4double, G4double)
static const G4double b2
const G4int n
G4double GetClosestApproach(const G4double, const G4double, G4double, G4double, G4double)
double G4double
Definition: G4Types.hh:76
static const G4double b4
static const double fermi
Definition: G4SIunits.hh:93