Crate nereids_physics 

nereids-physics

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

Modules

• auxiliary_grid — Auxiliary energy-grid construction for resolution broadening
• channel — Wave number, ρ parameter, statistical weight calculations
• continuous_doppler — Tier-1 Doppler: the free-gas kernel integrated over the resonance equation
• doppler — Free Gas Model Doppler broadening
• penetrability — Hard-sphere penetrability, shift, and phase shift functions
• reich_moore — Reich-Moore R-matrix cross-section formalism
• resolution — Instrument resolution broadening (Gaussian convolution)
• slbw — Breit-Wigner formalisms, single- and multi-level (LRF=1/2)
• surrogate — Forward-model surrogates for multi-isotope accelerated fits
• transmission — Beer-Lambert transmission forward model

SAMMY Reference

• Cross-sections: rml/ (Reich-Moore), mlb/ (SLBW/MLBW), manual Sec. II
• Penetrability: rml/mrml07.f (Pgh, Sinsix, Pf)
• Doppler: fgm/ module (Dopfgm), manual Sec. III.B.1
• Resolution: convolution/ module, manual Sec. III.C
• Transmission: cro/, xxx/ modules, manual Sec. II; transmission experiments Sec. III.E.1

Modules

auxiliary_grid

Auxiliary energy grid construction for resolution broadening.

channel

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

continuous_doppler

Doppler broadening by integrating the free-gas kernel over the resonance equation.

counts_response

Separate open-beam and sample count response in detector time.

doppler

Doppler broadening via the Free Gas Model (FGM).

flight_time_grid

The flight times whose neutrons can be counted in a set of detector time bins, and the counts a beam predicts there, on a uniform flight-time grid.

ikeda_carpenter

Ikeda–Carpenter analytical moderator resolution model.

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.

slbw

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

surrogate

Forward-model surrogates for multi-isotope accelerated fits.

transmission

Transmission forward model via the Beer-Lambert law.