Gabriele Cosmo
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4NeutronHPFissionSpectrum.hh,v 1.7 2002/12/12 19:18:13 gunter Exp $
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// GEANT4 tag $Name: geant4-05-00 $
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//
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#ifndef G4NeutronHPFissionSpectrum_h
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#define G4NeutronHPFissionSpectrum_h 1
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#include "globals.hh"
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#include "G4NeutronHPVector.hh"
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#include "Randomize.hh"
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#include "G4ios.hh"
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#include "g4std/fstream"
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#include "G4VNeutronHPEDis.hh"
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// we will need a List of these .... one per term.
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class G4NeutronHPFissionSpectrum : public G4VNeutronHPEDis
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{
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public:
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G4NeutronHPFissionSpectrum()
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{
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expm1 = exp(-1.);
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}
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~G4NeutronHPFissionSpectrum()
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{
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}
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inline void Init(G4std::ifstream & aDataFile)
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{
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theFractionalProb.Init(aDataFile, eV);
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theThetaDist.Init(aDataFile, eV);
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}
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inline G4double GetFractionalProbability(G4double anEnergy)
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{
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return theFractionalProb.GetY(anEnergy);
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}
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inline G4double Sample(G4double anEnergy)
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{
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G4double theta = theThetaDist.GetY(anEnergy);
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// here we need to sample Maxwells distribution, if
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// need be.
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G4double result, cut;
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G4double range =50*MeV;
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G4double max = Maxwell((theta*eV)/2., theta);
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G4double value;
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do
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{
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result = range*G4UniformRand();
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value = Maxwell(result, theta);
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cut = G4UniformRand();
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}
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while(cut > value/max);
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return result;
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}
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private:
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// this is the function to sample from.
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inline G4double Maxwell(G4double anEnergy, G4double theta)
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{
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G4double result = sqrt(anEnergy/eV)*exp(-anEnergy/eV/theta);
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return result;
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}
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private:
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G4double expm1;
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G4NeutronHPVector theFractionalProb;
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G4NeutronHPVector theThetaDist;
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};
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#endif
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