[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 | // * By using, copying, modifying or distributing the software (or * |
---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
---|
| 22 | // * use in resulting scientific publications, and indicate your * |
---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 24 | // ******************************************************************** |
---|
| 25 | // |
---|
[1340] | 26 | // $Id: G4HETCNeutron.cc,v 1.3 2010/08/28 15:16:55 vnivanch Exp $ |
---|
| 27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
---|
| 28 | // |
---|
| 29 | // by V. Lara |
---|
| 30 | // |
---|
| 31 | // Modified: |
---|
| 32 | // 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor |
---|
| 33 | // the source, use G4Pow |
---|
| 34 | |
---|
[819] | 35 | #include "G4HETCNeutron.hh" |
---|
[1340] | 36 | #include "G4Neutron.hh" |
---|
[819] | 37 | |
---|
[1340] | 38 | G4HETCNeutron::G4HETCNeutron() |
---|
| 39 | : G4HETCFragment(G4Neutron::Neutron(), &theNeutronCoulombBarrier) |
---|
| 40 | {} |
---|
| 41 | |
---|
| 42 | G4HETCNeutron::~G4HETCNeutron() |
---|
| 43 | {} |
---|
| 44 | |
---|
| 45 | G4double G4HETCNeutron::GetAlpha() |
---|
| 46 | { |
---|
| 47 | return 0.76+2.2/g4pow->Z13(GetRestA()); |
---|
| 48 | } |
---|
| 49 | |
---|
| 50 | G4double G4HETCNeutron::GetBeta() |
---|
| 51 | { |
---|
| 52 | return (2.12/g4pow->Z23(GetRestA())-0.05)*MeV/GetAlpha(); |
---|
| 53 | } |
---|
| 54 | |
---|
| 55 | G4double G4HETCNeutron::GetSpinFactor() |
---|
| 56 | { |
---|
| 57 | // (2s+1) |
---|
| 58 | return 2.0; |
---|
| 59 | } |
---|
| 60 | |
---|
[819] | 61 | G4double G4HETCNeutron::K(const G4Fragment & aFragment) |
---|
| 62 | { |
---|
[1340] | 63 | // Number of protons in emitted fragment |
---|
| 64 | G4int Pa = GetZ(); |
---|
| 65 | // Number of neutrons in emitted fragment |
---|
| 66 | G4int Na = GetA() - Pa; |
---|
| 67 | |
---|
| 68 | G4int TargetZ = GetRestZ(); |
---|
| 69 | G4int TargetA = GetRestA(); |
---|
| 70 | G4double r = G4double(TargetZ)/G4double(TargetA); |
---|
[819] | 71 | |
---|
[1340] | 72 | G4int P = aFragment.GetNumberOfParticles(); |
---|
| 73 | G4int H = aFragment.GetNumberOfHoles(); |
---|
[819] | 74 | |
---|
| 75 | G4double result = 0.0; |
---|
| 76 | if (P > 0) |
---|
| 77 | { |
---|
[1340] | 78 | result = (H + Na/(1.0-r))/P; |
---|
[819] | 79 | } |
---|
| 80 | |
---|
| 81 | return std::max(0.0,result); |
---|
| 82 | } |
---|
| 83 | |
---|
| 84 | G4double G4HETCNeutron::GetKineticEnergy(const G4Fragment & aFragment) |
---|
| 85 | { |
---|
[1340] | 86 | G4int H = aFragment.GetNumberOfHoles(); |
---|
| 87 | G4int Pb = aFragment.GetNumberOfParticles(); |
---|
| 88 | G4int Nb = Pb + H; |
---|
| 89 | G4double g0 = (6.0/pi2)*aFragment.GetA_asInt()*theParameters->GetLevelDensity(); |
---|
[819] | 90 | |
---|
[1340] | 91 | G4double Ab = std::max(0.0,G4double(Pb*Pb+H*H+Pb-3*H)/(4.0*g0)); |
---|
[819] | 92 | G4double Emax = GetMaximalKineticEnergy() - Ab; |
---|
| 93 | |
---|
[1340] | 94 | G4double cut = GetBeta() / (GetBeta()+Emax/G4double(Nb+1)); |
---|
[819] | 95 | G4double x(0.0); |
---|
| 96 | if (G4UniformRand() <= cut) |
---|
| 97 | { |
---|
[1340] | 98 | x = BetaRand(Nb,1); |
---|
[819] | 99 | } |
---|
| 100 | else |
---|
| 101 | { |
---|
[1340] | 102 | x = BetaRand(Nb,2); |
---|
[819] | 103 | } |
---|
| 104 | |
---|
| 105 | return Emax * (1.0 - x); |
---|
| 106 | } |
---|