G4FPYBiasedLightFragmentDist.hh

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/*
 * File:   G4FPYBiasedLightFragmentDist.hh
 * Author: B. Wendt ([email protected])
 *
 * Created on June 2, 2011, 11:02 AM
 */
 
#ifndef G4FPYBIASEDLIGHTFRAGMENTDIST_HH
#define G4FPYBIASEDLIGHTFRAGMENTDIST_HH
 
#include "G4FFGEnumerations.hh"
#include "G4FissionProductYieldDist.hh"
#include "G4Ions.hh"
#include "globals.hh"
 
/** G4FPYBiasedLightFragmentDist is an inherited class of G4FissionProductYield
 *  that only samples the 'light' fission fragments, defined by A < 115
 *      - This inherited class of G4FissionProductYield samples only the lighter
 *      fission fragments, defined by A < 115
 *      - This biasing was implemented because of an artifact that is introduced
 *      due to random sampling of fission fragments. Typically small fission
 *      fragments (neutrons, alphas, gammas) are sampled after the first
 *      fragment is sampled. If a heavy fragment (A >= 115) is sampled first
 *      then the resulting lighter fission fragment, after all the other
 *      particles have been removed from the available mass, will most likely
 *      land far off the neutron drip line.
 *      - This implementation reduces the probability that such an improbable
 *      nucleus will be created by first sampling the lighter fission fragment
 *      and allowing the heavy fission fragment, which has a lot more
 *      flexibility for varying neutron populations, to make up the slack.
 */
class G4FPYBiasedLightFragmentDist : public G4FissionProductYieldDist
{
  public:
    // Constructor definition
    /** Default constructor
     *  - Usage:
     *      - \p WhichIsotope: Isotope number of the element in ZZZAAA form
     *      - \p WhichMetaState: \p GROUND_STATE, \p META_1, or \p META_2
     *      - \p WhichCause: \p SPONTANEOUS or \p N_INDUCED
     *      - \p WhichYieldType: \p INDEPENDENT or \p CUMULATIVE
     *
     *  - Notes:
     */
    G4FPYBiasedLightFragmentDist(G4int WhichIsotope, G4FFGEnumerations::MetaState WhichMetaState,
                                 G4FFGEnumerations::FissionCause WhichCause,
                                 G4FFGEnumerations::YieldType WhichYieldType,
                                 std::istringstream& dataStream);
    /** Overloaded constructor
     *  - Usage:
     *      - \p WhichIsotope: Isotope number of the element in ZZZAAA form
     *      - \p WhichMetaState: \p GROUND_STATE, \p META_1, or \p META_2
     *      - \p WhichCause: \p SPONTANEOUS or \p N_INDUCED
     *      - \p WhichYieldType: \p INDEPENDENT or \p CUMULATIVE
     *      - \p Verbosity: Verbosity level
     *
     *  - Notes:
     */
    G4FPYBiasedLightFragmentDist(G4int WhichIsotope, G4FFGEnumerations::MetaState WhichMetaState,
                                 G4FFGEnumerations::FissionCause WhichCause,
                                 G4FFGEnumerations::YieldType WhichYieldType, G4int Verbosity,
                                 std::istringstream& dataStream);
 
  protected:
    /** Initialize is a common function called by all constructors. */
    void Initialize();
 
  protected:
    // Variables
    /** Defines the half-weight of the fission isotope */
    G4int HalfWeight_;
    // Functions
    /** Selects a fission product from the probability tree, limited by the
     *  number of nucleons available to the system
     */
    G4Ions* GetFissionProduct() override;
 
    // Destructor function(s)
  public:
    /** Default deconstructor. It is a virtual function since
     *  G4FPYBiasedLightFragmentDist inherits from G4FissionProductYieldDist
     */
    ~G4FPYBiasedLightFragmentDist() override;
};
 
#endif /* G4FPYBIASEDLIGHTFRAGMENTDIST_HH */