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 "G4HETCAlpha.hh" 00035 #include "G4Alpha.hh" 00036 00037 G4HETCAlpha::G4HETCAlpha() 00038 : G4HETCChargedFragment(G4Alpha::Alpha(), &theAlphaCoulombBarrier) 00039 {} 00040 00041 G4HETCAlpha::~G4HETCAlpha() 00042 {} 00043 00044 G4double G4HETCAlpha::GetAlpha() 00045 { 00046 G4double C = 0.0; 00047 G4int aZ = GetZ() + GetRestZ(); 00048 if (aZ <= 30) 00049 { 00050 C = 0.10; 00051 } 00052 else if (aZ <= 50) 00053 { 00054 C = 0.1 + -((aZ-50.)/20.)*0.02; 00055 } 00056 else if (aZ < 70) 00057 { 00058 C = 0.08 + -((aZ-70.)/20.)*0.02; 00059 } 00060 else 00061 { 00062 C = 0.06; 00063 } 00064 return 1.0+C; 00065 } 00066 00067 G4double G4HETCAlpha::GetBeta() 00068 { 00069 return -GetCoulombBarrier(); 00070 } 00071 00072 G4double G4HETCAlpha::GetSpinFactor() 00073 { 00074 return 1.0; 00075 } 00076 00077 G4double G4HETCAlpha::K(const G4Fragment & aFragment) 00078 { 00079 // Number of protons in emitted fragment 00080 G4int Pa = GetZ(); 00081 // Number of neutrons in emitted fragment 00082 G4int Na = GetA() - Pa; 00083 00084 G4int TargetZ = GetRestZ(); 00085 G4int TargetA = GetRestA(); 00086 G4double r = G4double(TargetZ)/G4double(TargetA); 00087 00088 G4int P = aFragment.GetNumberOfParticles(); 00089 G4int H = aFragment.GetNumberOfHoles(); 00090 00091 G4double result = 0.0; 00092 if (P > 3) 00093 { 00094 result = 3.0/(P*(P-1.0)*(P-2.0)*(P-3.0)) * 00095 (H*(H-1.0)*(H-2.0)*(H-3.0)*r*r*(r-1.0)*(r-1.0) + 00096 2.0*H*(H-1.0)*(H-2.0)*(Pa*r*(1.0-r)*(1.0-r)+Na*r*r*(1.0-r)) + 00097 H*(H-1.0)*(Pa*(Pa-1.0)*(1.0-r)*(1.0-r)+4.0*Na*Pa*r*(1.0-r)+Na*(Na-1.0)*r*r) + 00098 2*H*(Pa*Na*(Na-1.0)*r+Pa*(Pa-1.0)*Na*(1.0-r)) + 00099 Pa*(Pa-1.0)*Na*(Na-1.0)); 00100 00101 result /= 6.0*r*r*(1. - r) *(1. - r); 00102 } 00103 return std::max(0.0,result); 00104 }