102 lines
3.8 KiB
C++
102 lines
3.8 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: G4FissionProbability.cc,v 1.4 2003/11/14 16:54:18 hpw Exp $
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// GEANT4 tag $Name: geant4-06-00 $
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//
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// Hadronic Process: Nuclear De-excitations
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// by V. Lara (Oct 1998)
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//
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#include "G4FissionProbability.hh"
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#include "G4PairingCorrection.hh"
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G4FissionProbability::G4FissionProbability(const G4FissionProbability &) : G4VEmissionProbability()
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4FissionProbability::copy_constructor meant to not be accessable");
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}
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const G4FissionProbability & G4FissionProbability::operator=(const G4FissionProbability &)
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4FissionProbability::operator= meant to not be accessable");
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return *this;
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}
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G4bool G4FissionProbability::operator==(const G4FissionProbability &) const
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{
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return false;
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}
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G4bool G4FissionProbability::operator!=(const G4FissionProbability &) const
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{
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return true;
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}
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G4double G4FissionProbability::EmissionProbability(const G4Fragment & fragment, const G4double MaximalKineticEnergy)
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// Compute integrated probability of fission channel
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{
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if (MaximalKineticEnergy <= 0.0) return 0.0;
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G4double A = fragment.GetA();
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G4double Z = fragment.GetZ();
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G4double U = fragment.GetExcitationEnergy();
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G4double Ucompound = U - G4PairingCorrection::GetInstance()->GetPairingCorrection(static_cast<G4int>(A),
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static_cast<G4int>(Z));
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G4double Ufission = U - G4PairingCorrection::GetInstance()->GetFissionPairingCorrection(static_cast<G4int>(A),
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static_cast<G4int>(Z));
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G4double SystemEntropy = 2.0*sqrt(theEvapLDP.LevelDensityParameter(static_cast<G4int>(A),
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static_cast<G4int>(Z),
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Ucompound)*Ucompound);
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G4double afission = theFissLDP.LevelDensityParameter(static_cast<G4int>(A),
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static_cast<G4int>(Z),
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Ufission);
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G4double Cf = 2.0*sqrt(afission*MaximalKineticEnergy);
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// G4double Q1 = 1.0 + (Cf - 1.0)*exp(Cf);
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// G4double Q2 = 4.0*pi*afission*exp(SystemEntropy);
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// G4double probability = Q1/Q2;
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G4double Exp1 = 0.0;
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if (SystemEntropy <= 160.0) Exp1 = exp(-SystemEntropy);
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// @@@@@@@@@@@@@@@@@ hpw changed max to min - cannot notify vicente now since cern mail gave up on me...
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G4double Exp2 = exp( std::min(700.0,Cf-SystemEntropy) );
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G4double probability = (Exp1 + (1.0-Cf)*Exp2) / 4.0*pi*afission;
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return probability;
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}
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