resonance cross-section

in Mössbauer spectrometry
https://doi.org/10.1351/goldbook.R05329
The cross-section for resonant absorption of the Mössbauer transition γ ray.
Source:
PAC, 1976, 45, 211. (Nomenclature and Conventions for Reporting Mössbauer Spectroscopic Data) on page 214 [Terms] [Paper]