G4WattFissionSpectrumValues.hh

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/*
 * File:   G4WattFissionSpectrumValues.hh
 * Author: B. Wendt ([email protected])
 *
 * Created on July 11, 2011, 11:32 AM
 */
 
/* * * * * * * * * * * * * * * *   References   * * * * * * * * * * * * * * * *
 *                                                                            *
 *  1.  MCNP - A General Monte carlo N-Particle Transport Code, Version 5,    *
 *      X-5 Monte Carlo Team, Volume I: Overview and Theory, April, 2005      *
 *                                                                            *
 * * * * * * * * * * * * * * * *   References   * * * * * * * * * * * * * * * */
 
#ifndef G4WATTFISSIONSPECTRUMVALUES_HH
#define G4WATTFISSIONSPECTRUMVALUES_HH
 
#include "G4FFGDefaultValues.hh"
#include "G4FFGEnumerations.hh"
#include "globals.hh"
 
// TODO Migrate to existing neutron_hp watt constants in G4NeutronHPWattSpectrum.hh
//      and then remove this file from the repo and sources.cmake
 
/** WattSpectrumConstants contains constants and other variables for use in
 *  sampling the Watt fission spectrum.
 */
struct WattSpectrumConstants
{
    /** Isotope code in ZZZAAA format for which the Watt fission
     *  spectrum is being sampled
     */
    G4int Product;
    /** Fission cause for which the Watt fission spectrum is being
     * sampled
     */
    G4FFGEnumerations::FissionCause Cause;
    /** Energy, if any, of the incident particle that cause the fission */
    G4double Energy;
 
    /** Sampling constant. Calculated as:
     * \f[
     *  L = \frac{[K + (K^2 - 1)^\frac{1}{2}]}{a}
     * \f]
     * \f[
     * K = 1 + \frac{b}{8a}
     * \f]
     */
    G4double L;
    /** Sampling constant. Calculated as:
     * \f[
     * M = a*L-1
     * \f]
     */
    G4double M;
    /** Sampling constant taken from the data tables. */
    G4double B;
};
 
/** These are the energy values in MeV for the neutron induced Watt fission
 *  spectrum constants.
 */
static const G4double IncidentEnergyBins[] = {
  G4FFGDefaultValues::ThermalNeutronEnergy, 1.0 * CLHEP::MeV, 14.0 * CLHEP::MeV,
  -1  // End of array
};
 
/** Watt fission spectrum constants for neutron induced fission.
 *  \n <b> Constants </b>
 *  \n Column 1: 'a' value
 *  \n Column 2: 'b' value
 *
 *  \n <b> Incident Neutron Energies </b>
 *  \n Row 1: Thermal (~0.025 eV)
 *  \n Row 2: 1 MeV
 *  \n Row 3: 14 MeV
 */
static const G4double NeutronInducedWattConstants[][3][2] = {
  // Default
  {
    {0.95, 2.7},
    {1.0, 2.5},
    {1.05, 2.4},
  },
  // Thorium
  // 90232
  {
    {1.0888, 1.6871},
    {1.1096, 1.6316},
    {1.1700, 1.4610},
  },
  // Uranium
  // 92233
  {
    {0.977, 2.546},
    {0.977, 2.249},
    {1.0036, 2.6377},
  },
  // 92235
  {
    {0.988, 2.249},
    {0.988, 2.249},
    {1.028, 2.084},
  },
  // 92238
  {
    {0.88111, 3.4005},
    {0.89506, 3.2953},
    {0.96534, 2.8330},
  },
  // Plutonium
  // 94239
  {
    {0.966, 2.842},
    {0.966, 2.842},
    {1.055, 2.383},
  }};
 
/** This table provides the indexing for NeutronInducedWattConstants_. The
 *  index of an isotope in this table is the index for the Watt fission spectrum
 *  constants in NeutronInducedWattConstants_. The isotopes are listed in ZZZAAA
 *  format.
 */
static const G4int NeutronInducedWattIsotopesIndex[] = {
  // Default
  0,
  // Thorium
  90232,
  // Uranium
  92233, 92235, 92238,
  // Plutonium
  94239,
  // End of array
  -1};
 
/** Watt fission spectrum constants for spontaneous fission.
 *  \n Column 1: 'a' value
 *  \n Column 2: 'b' value
 */
static const G4double SpontaneousWattConstants[][2] = {
  // Default
  {0.8, 4.0},
  // Plutonium
  // 94240
  {0.799, 4.903},
  // 94242
  {0.833668, 4.431658},
  // Curium
  // 96242
  {0.891, 4.046},
  // 96244
  {0.906, 3.848},
  // Californium
  // 98252
  {1.025, 2.926}};
 
/** This table provides the indexing for SpontaneousWattConstants_. The index of
 *  an isotope in this table is the index for the Watt fission spectrum constants
 *  in SpontaneousWattConstants_. The isotopes are listed in ZZZAAA format.
 */
static const G4int SpontaneousWattIsotopesIndex[] = {
  // Default
  0,
  // Plutonium
  94240, 94242,
  // Curium
  96242, 96244,
  // Californium
  98252,
  // End of array
  -1};
 
#endif /* G4WATTFISSIONSPECTRUMVALUES_HH */