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57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
//! \file secondary_kalbach.h
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//! Kalbach-Mann angle-energy distribution
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#ifndef OPENMC_SECONDARY_KALBACH_H
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#define OPENMC_SECONDARY_KALBACH_H
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#include "hdf5.h"
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#include "xtensor/xtensor.hpp"
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#include "openmc/angle_energy.h"
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#include "openmc/constants.h"
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#include "openmc/endf.h"
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#include "openmc/vector.h"
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namespace openmc {
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//==============================================================================
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//! Correlated angle-energy distribution with the angular distribution
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//! represented using Kalbach-Mann systematics. This corresponds to ACE law 44
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//! and ENDF File 6, LAW=1, LANG=2.
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//==============================================================================
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class KalbachMann : public AngleEnergy {
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public:
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explicit KalbachMann(hid_t group);
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//! Sample distribution for an angle and energy
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//! \param[in] E_in Incoming energy in [eV]
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//! \param[out] E_out Outgoing energy in [eV]
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//! \param[out] mu Outgoing cosine with respect to current direction
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//! \param[inout] seed Pseudorandom seed pointer
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void sample(
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double E_in, double& E_out, double& mu, uint64_t* seed) const override;
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private:
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//! Outgoing energy/angle at a single incoming energy
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struct KMTable {
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int n_discrete; //!< Number of discrete lines
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Interpolation interpolation; //!< Interpolation law
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xt::xtensor<double, 1> e_out; //!< Outgoing energies [eV]
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xt::xtensor<double, 1> p; //!< Probability density
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xt::xtensor<double, 1> c; //!< Cumulative distribution
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xt::xtensor<double, 1> r; //!< Pre-compound fraction
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xt::xtensor<double, 1> a; //!< Parameterized function
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};
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int n_region_; //!< Number of interpolation regions
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vector<int> breakpoints_; //!< Breakpoints between regions
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vector<Interpolation> interpolation_; //!< Interpolation laws
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vector<double> energy_; //!< Energies [eV] at which distributions
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//!< are tabulated
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vector<KMTable> distribution_; //!< Distribution at each energy
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};
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} // namespace openmc
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#endif // OPENMC_SECONDARY_KALBACH_H
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