openmc.data.MultiLevelBreitWigner¶
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class
openmc.data.
MultiLevelBreitWigner
(target_spin, energy_min, energy_max, channel, scattering)[source]¶ Multi-level Breit-Wigner resolved resonance formalism data.
Multi-level Breit-Wigner resolved resonance data is identified by LRF=2 in the ENDF-6 format.
Parameters: - target_spin (float) – Intrinsic spin, \(I\), of the target nuclide
- energy_min (float) – Minimum energy of the resolved resonance range in eV
- energy_max (float) – Maximum energy of the resolved resonance range in eV
- channel (dict) – Dictionary whose keys are l-values and values are channel radii as a function of energy
- scattering (dict) – Dictionary whose keys are l-values and values are scattering radii as a function of energy
Variables: - atomic_weight_ratio (float) – Atomic weight ratio of the target nuclide given as a function of l-value. Note that this may be different than the value for the evaluation as a whole.
- channel_radius (dict) – Dictionary whose keys are l-values and values are channel radii as a function of energy
- energy_max (float) – Maximum energy of the resolved resonance range in eV
- energy_min (float) – Minimum energy of the resolved resonance range in eV
- parameters (pandas.DataFrame) – Energies, spins, and resonances widths for each resonance
- q_value (dict) – Q-value to be added to incident particle’s center-of-mass energy to determine the channel energy for use in the penetrability factor. The keys of the dictionary are l-values.
- scattering_radius (dict) – Dictionary whose keys are l-values and values are scattering radii as a function of energy
- target_spin (float) – Intrinsic spin, \(I\), of the target nuclide
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classmethod
from_endf
(ev, file_obj, items)[source]¶ Create MLBW data from an ENDF evaluation.
Parameters: - ev (openmc.data.endf.Evaluation) – ENDF evaluation
- file_obj (file-like object) – ENDF file positioned at the second record of a resonance range subsection in MF=2, MT=151
- items (list) – Items from the CONT record at the start of the resonance range subsection
Returns: Multi-level Breit-Wigner resonance parameters
Return type: