Crate nereids_physics 

nereids-physics

Cross-section calculation, Doppler/resolution broadening, and transmission forward model for neutron resonance imaging.

Modules

• penetrability — Hard-sphere penetrability, shift, and phase shift functions
• channel — Wave number, ρ parameter, statistical weight calculations
• reich_moore — Reich-Moore R-matrix cross-section formalism
• slbw — Single-Level Breit-Wigner formalism (validation/comparison)
• doppler — Free Gas Model Doppler broadening
• resolution — Instrument resolution broadening (Gaussian convolution)
• transmission — Beer-Lambert transmission forward model
• urr — Unresolved Resonance Region (LRU=2) Hauser-Feshbach cross-sections

SAMMY Reference

• Cross-sections: rml/ (Reich-Moore), mlb/ (SLBW/MLBW), manual Sec 2
• Penetrability: rml/mrml07.f (Pgh, Sinsix, Pf)
• Coulomb: coulomb/mrml08.f90 (Coulfg, Steed’s CF1+CF2)
• Doppler: dop/ module, manual Sec 3.1
• Resolution: convolution/ module, manual Sec 3.2
• Transmission: cro/, xxx/ modules, manual Sec 2, Sec 5

Modules

auxiliary_grid

Auxiliary energy grid construction for resolution broadening.

channel

Neutron channel calculations: wave number, ρ parameter, statistical weights.

coulomb

Coulomb wave functions via Steed’s continued-fraction method.

doppler

Doppler broadening via the Free Gas Model (FGM).

penetrability

Hard-sphere penetrability, shift, and phase shift functions.

reich_moore

Multi-formalism cross-section dispatcher.

resolution

Resolution broadening via convolution with instrument resolution function.

rmatrix_limited

R-Matrix Limited (LRF=7) cross-section calculation.

slbw

Single-Level Breit-Wigner (SLBW) cross-section calculation.

transmission

Transmission forward model via the Beer-Lambert law.

urr

Unresolved Resonance Region (LRU=2) cross-section calculation.