pub const TOF_FACTOR: f64 = 72.298_254_398_292_8;Expand description
TOF conversion factor: t (μs) = TOF_FACTOR × L (m) / √(E in eV).
Derived from t = L / √(2E/m_n), converting to microseconds: TOF_FACTOR = 1e6 / √(2 × EV_TO_JOULES / NEUTRON_MASS_KG)
Uses CODATA 2018 values (both exact in the 2019 SI).
pub so the analytical crate::ikeda_carpenter model and the
nereids-fitting resolution calibrator both use the identical TOF↔energy
constant (the calibrator’s position nuisance shifts the grid in TOF) — any
drift here would make the IC-vs-tabulated cross-validation unfair.