Gabriele Cosmo
83 lines
2.2 KiB
C++
83 lines
2.2 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: G4NeutronHPNBodyPhaseSpace.hh,v 1.4 1999/12/15 14:53:12 gunter Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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//
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#ifndef G4NeutronHPNBodyPhaseSpace_h
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#define G4NeutronHPNBodyPhaseSpace_h 1
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#include "G4ios.hh"
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#include "g4std/fstream"
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#include "globals.hh"
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#include "G4Neutron.hh"
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#include "G4VNeutronHPEnergyAngular.hh"
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#include "G4ReactionProduct.hh"
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class G4NeutronHPNBodyPhaseSpace : public G4VNeutronHPEnergyAngular
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{
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public:
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G4NeutronHPNBodyPhaseSpace(){}
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~G4NeutronHPNBodyPhaseSpace(){}
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public:
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void Init(G4double aMass, G4int aCount)
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{
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theTotalMass=aMass;
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theTotalCount=aCount;
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}
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void Init(G4std::ifstream & aDataFile)
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{
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aDataFile >> theTotalMass >> theTotalCount;
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theTotalMass *= G4Neutron::Neutron()->GetPDGMass();
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}
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G4ReactionProduct * Sample(G4double anEnergy, G4double massCode, G4double mass);
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private:
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inline G4double Prob(G4double anEnergy, G4double eMax, G4int n)
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{
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G4double result;
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result = sqrt(anEnergy)*pow(eMax-anEnergy, 3.*n/2.-4.);
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return result;
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}
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inline G4double C(G4double anEnergy, G4double mass)
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{
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G4double result;
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if(theTotalCount==3) result = 4./pi/pow(GetEmax(anEnergy, mass),2);
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if(theTotalCount==4) result = 105./32./pow(GetEmax(anEnergy, mass), 3.5);
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if(theTotalCount==5) result = 256./14./pi/pow(GetEmax(anEnergy, mass), 5.);
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return result;
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}
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inline G4double GetEmax(G4double anEnergy, G4double mass)
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{
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G4double result;
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G4double tMass = GetTarget()->GetMass();
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G4double pMass = GetNeutron()->GetMass();
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G4double availableEnergy = GetQValue() + anEnergy*tMass/(pMass+tMass);
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result = availableEnergy*(theTotalMass-mass)/theTotalMass;
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return result;
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}
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G4double MeanEnergyOfThisInteraction() {return -1; }
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private:
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G4double theTotalMass;
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G4int theTotalCount;
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};
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#endif
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