Phenomenological description of neutron capture cross sections at 30 keV
  Studying published data of Maxwellian averaged neutron capture cross sections, we found simple phenomenological rules obeyed by the cross sections as a function of proton and neutron number. We use these rules to make predictions for cross sections of neutron capture on nuclei with proton number above 83, where very few data are available. 
Miklos Kiss and Zoltan Trocsanyi
nucl-ex