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 // neutron_hp -- source file 00027 // J.P. Wellisch, Nov-1996 00028 // A prototype of the low energy neutron transport model. 00029 // 00030 // 080718 As for secondary photons, if its mean value has a value of integer, 00031 // then a sampling of multiplicity that based on Poisson Distribution 00032 // is not carried out and the mean is used as a multiplicity. 00033 // modified by T. Koi. 00034 // 080721 Using ClearHistories() methodl for limiting the sum of secondary energies 00035 // modified by T. Koi. 00036 // 080901 bug fix of too many secnodaries production in nd reactinos by T. Koi 00037 // 00038 #include "G4NeutronHPProduct.hh" 00039 #include "G4Poisson.hh" 00040 #include "G4Proton.hh" 00041 00042 G4ReactionProductVector * G4NeutronHPProduct::Sample(G4double anEnergy) 00043 { 00044 if(theDist == 0) { return 0; } 00045 G4ReactionProductVector * result = new G4ReactionProductVector; 00046 G4double mean = theYield.GetY(anEnergy); 00047 G4int multi; 00048 multi = G4int(mean+0.0001); 00049 //if(theMassCode==0) multi = G4Poisson(mean); // @@@@gammas. please X-check this 00050 //080718 00051 if ( theMassCode == 0 ) 00052 { 00053 if ( G4int ( mean ) == mean ) 00054 { 00055 multi = (G4int) mean; 00056 } 00057 else 00058 { 00059 multi = G4Poisson ( mean ); 00060 } 00061 } 00062 theDist->SetTarget(theTarget); 00063 theDist->SetNeutron(theNeutron); 00064 G4int i; 00065 // G4double eMax = GetTarget()->GetMass()+GetNeutron()->GetMass() 00066 // - theActualStateQValue; 00067 theCurrentMultiplicity = static_cast<G4int>(mean); 00068 G4ReactionProduct * tmp; 00069 theDist->ClearHistories(); 00070 for(i=0;i<multi;i++) 00071 { 00072 tmp = theDist->Sample(anEnergy, theMassCode, theMass); 00073 if(tmp != 0) { result->push_back(tmp); } 00074 } 00075 if(multi == 0) 00076 { 00077 tmp = theDist->Sample(anEnergy, theMassCode, theMass); 00078 delete tmp; 00079 } 00080 /* 00081 //080901 TK Comment out, too many secondaries are produced in deuteron reactions 00082 if(theTarget->GetMass()<2*GeV) // @@@ take care of residuals in all cases 00083 { 00084 tmp = theDist->Sample(anEnergy, theMassCode, theMass); 00085 tmp->SetDefinition(G4Proton::Proton()); 00086 if(tmp != 0) { result->push_back(tmp); } 00087 } 00088 */ 00089 return result; 00090 }