Gabriele Cosmo
81 lines
1.8 KiB
C++
81 lines
1.8 KiB
C++
// This code implementation is the intellectual property of
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// neutron_hp -- header 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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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4NeutronHPSimpleEvapSpectrum.hh,v 1.4 1999/12/15 14:53:14 gunter Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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//
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#ifndef G4NeutronHPSimpleEvapSpectrum_h
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#define G4NeutronHPSimpleEvapSpectrum_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 G4NeutronHPSimpleEvapSpectrum : public G4VNeutronHPEDis
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{
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public:
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G4NeutronHPSimpleEvapSpectrum()
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{
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expm1 = exp(-1.);
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}
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~G4NeutronHPSimpleEvapSpectrum()
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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)*eV;
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G4double random, cut, max, result;
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max = 10.*theta;
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do
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{
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random = G4UniformRand();
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result = -theta*log(random);
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cut = G4UniformRand();
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}
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while(cut>result/max);
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return result;
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}
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private:
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inline G4double Evapo(G4double anEnergy, G4double theta)
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{
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G4double result = (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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