Systematics of Maxwellian-averaged neutron capture cross-sections (MACS) at 30keV

A formula for Maxwellian-Averaged Cross-Sections (MACS) at 30 keV is derived. Based on the presented formula, a linear relationship was found between the log (MACS/A(1.4)) and (N-Z)(2)/A(2) of the target nucleus. From this relationship, a good agreement between the calculated MACS and the experimental data can be observed. It seems therefore possible to use this systematic law in order to analyze the experimental data. It would be useful in estimating the MACS of neighboring isotopes for which no experimental data are available.