00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // $Id$ 00027 // 00028 // by V. Lara 00029 // 00030 // Modified: 00031 // 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor 00032 // the source, use G4Pow 00033 00034 #include "G4HETCNeutron.hh" 00035 #include "G4PhysicalConstants.hh" 00036 #include "G4SystemOfUnits.hh" 00037 #include "G4Neutron.hh" 00038 00039 G4HETCNeutron::G4HETCNeutron() 00040 : G4HETCFragment(G4Neutron::Neutron(), &theNeutronCoulombBarrier) 00041 {} 00042 00043 G4HETCNeutron::~G4HETCNeutron() 00044 {} 00045 00046 G4double G4HETCNeutron::GetAlpha() 00047 { 00048 return 0.76+2.2/g4pow->Z13(GetRestA()); 00049 } 00050 00051 G4double G4HETCNeutron::GetBeta() 00052 { 00053 return (2.12/g4pow->Z23(GetRestA())-0.05)*MeV/GetAlpha(); 00054 } 00055 00056 G4double G4HETCNeutron::GetSpinFactor() 00057 { 00058 // (2s+1) 00059 return 2.0; 00060 } 00061 00062 G4double G4HETCNeutron::K(const G4Fragment & aFragment) 00063 { 00064 // Number of protons in emitted fragment 00065 G4int Pa = GetZ(); 00066 // Number of neutrons in emitted fragment 00067 G4int Na = GetA() - Pa; 00068 00069 G4int TargetZ = GetRestZ(); 00070 G4int TargetA = GetRestA(); 00071 G4double r = G4double(TargetZ)/G4double(TargetA); 00072 00073 G4int P = aFragment.GetNumberOfParticles(); 00074 G4int H = aFragment.GetNumberOfHoles(); 00075 00076 G4double result = 0.0; 00077 if (P > 0) 00078 { 00079 result = (H + Na/(1.0-r))/P; 00080 } 00081 00082 return std::max(0.0,result); 00083 } 00084 00085 G4double G4HETCNeutron::GetKineticEnergy(const G4Fragment & aFragment) 00086 { 00087 G4int H = aFragment.GetNumberOfHoles(); 00088 G4int Pb = aFragment.GetNumberOfParticles(); 00089 G4int Nb = Pb + H; 00090 G4double g0 = (6.0/pi2)*aFragment.GetA_asInt()*theParameters->GetLevelDensity(); 00091 00092 G4double Ab = std::max(0.0,G4double(Pb*Pb+H*H+Pb-3*H)/(4.0*g0)); 00093 G4double Emax = GetMaximalKineticEnergy() - Ab; 00094 00095 G4double cut = GetBeta() / (GetBeta()+Emax/G4double(Nb+1)); 00096 G4double x(0.0); 00097 if (G4UniformRand() <= cut) 00098 { 00099 x = BetaRand(Nb,1); 00100 } 00101 else 00102 { 00103 x = BetaRand(Nb,2); 00104 } 00105 00106 return Emax * (1.0 - x); 00107 }