Quickstart: Rust

Add the crates you need:

[dependencies]
nereids-core = "0.3"
nereids-endf = "0.3"
nereids-physics = "0.3"
nereids-pipeline = "0.3"

The fitting entry point is nereids_pipeline::counts_fit::fit_counts. It takes

• a Measurement: raw open-beam and sample counts on the same time-of-flight bin edges, the sample run’s proton-charge ratio, a normalization, a time background, and one or more regions, each with its background, pixel count, gamma transmission and material;
• a Calibration: t0, the flight path and the Ikeda-Carpenter pulse.

It returns a CountsFit carrying the fitted areal densities, temperatures, backgrounds, timing, pulse numbers and covariance, plus the deviance and a convergence flag. nereids_pipeline::counts_map::fit_map fits patches of pixels as one counts fit.

Inputs come from nereids_endf (resonance data), nereids_io (raw counts) and nereids_pipeline::open_beam::fit_open_beam (the incident beam fitted to the open-beam counts). The counts_fit integration tests under crates/nereids-pipeline/tests/ are a worked end-to-end example.