Crate nereids_physics 

nereids-physics

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

Modules

• auxiliary_grid - auxiliary energy grid for resolution broadening
• channel - wave number, rho parameter, statistical weights
• continuous_doppler - the free-gas kernel integrated over the resonance equation
• detector_spread - counts the detector records away from where they arrive
• doppler - free-gas-model Doppler broadening
• forward_scatter - neutrons scattered once in a slab that leave through its back face
• lattice_doppler - Doppler broadening by nuclei bound in a harmonic crystal
• penetrability - hard-sphere penetrability, shift and phase shift
• reich_moore - resolved cross sections: Reich-Moore (LRF=3) and R-Matrix Limited (LRF=7)
• resolution - instrument resolution broadening
• slbw - single- and multi-level Breit-Wigner (LRF=1/2)
• thickness - transmission of a sample whose areal density varies
• 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

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.

detector_spread

Counts the detector records away from where they arrive.

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.

forward_scatter

Neutrons scattered once in a slab sample that leave through its back face.

ikeda_carpenter

Ikeda–Carpenter analytical moderator resolution model.

lattice_doppler

Doppler broadening by nuclei bound in a harmonic crystal.

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.

thickness

Transmission of a sample whose areal density varies over the pixels a count sums.

transmission

Transmission forward model via the Beer-Lambert law.