Gabriele Cosmo
94 lines
3.8 KiB
C++
94 lines
3.8 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// neutron_hp -- source file
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// J.P. Wellisch, Nov-1996
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// A prototype of the low energy neutron transport model.
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//
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// P. Arce, June-2014 Conversion neutron_hp to particle_hp
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//
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#include "G4ParticleHPArbitaryTab.hh"
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#include "G4ios.hh"
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G4double G4ParticleHPArbitaryTab::Sample(G4double anEnergy)
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{
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G4int i;
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for(i=0;i<nDistFunc;i++)
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{
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if(anEnergy<theDistFunc[i].GetLabel()) break; // that is the energy we need
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}
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G4int low(0), high(0);
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if(i==nDistFunc)
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{
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low = i-2;
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high = i-1;
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}
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else if(i==0)
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{
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if(nDistFunc==0)
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{
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G4cerr << "No distribution functions to sample "
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<< "from in G4ParticleHPArbitaryTab::Sample"<<G4endl;
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throw G4HadronicException(__FILE__, __LINE__, "nDistFunc==0");
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}
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else
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{
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return theDistFunc[0].Sample();
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}
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}
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else
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{
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low = i-1;
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high = i;
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}
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//************************************************************************
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//EMendoza
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/*
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theBuffer.Merge(theManager.GetScheme(low), anEnergy,
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theDistFunc+low, theDistFunc+high);
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return theBuffer.Sample();
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*/
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//************************************************************************
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//New way to perform the 2D sampling:
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G4double elow=theDistFunc[low].GetLabel();
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G4double ehigh=theDistFunc[high].GetLabel();
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G4double rval=(anEnergy-elow)/(ehigh-elow);//rval is 0 for elow and 1 for ehigh
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G4double eoutlow=theLowThreshold[low]+rval*(theLowThreshold[high]-theLowThreshold[low]);
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G4double eouthigh=theHighThreshold[low]+rval*(theHighThreshold[high]-theHighThreshold[low]);
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G4double rand=G4UniformRand();
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G4double Eout_1=0,Eout_2=0;
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if(rval<rand){
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Eout_1=theDistFunc[low].Sample();
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Eout_2=eoutlow+(Eout_1-theLowThreshold[low])*(eouthigh-eoutlow)/(theHighThreshold[low]-theLowThreshold[low]);
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}
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else{
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Eout_1=theDistFunc[high].Sample();
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Eout_2=eoutlow+(Eout_1-theLowThreshold[high])*(eouthigh-eoutlow)/(theHighThreshold[high]-theLowThreshold[high]);
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}
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return Eout_2;
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//************************************************************************
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}
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