  The Regge-pole calculated low-energy electron elastic total cross sections
(TCSs) for Cm and No, characterized generally by negative-ion formation, shape
resonances and Ramsauer-Townsend(R-T) minima, exhibit atomic and fullerene
molecular behavior near threshold. Also, a polarization-induced metastable
cross section with a deep R-T minimum near threshold is identified in the Cm
TCSs, which flips over to a shape resonance appearing very close to threshold
in the TCSs for No. We attribute these novel manifestations to size effects and
orbital collapse impacting significantly the polarization interaction. This
provides a new mechanism of tuning a shape resonance and R-T minimum through
the polarization interaction. The comparison between the Regge-pole calculated
ground, metastable and excited states anionic binding energies(BEs) with the
existing theoretical electron affinities(EAs) demonstrates that those
calculations tend to obtain metastable and/or excited states BEs and equate
them incorrectly with the EAs, leading to ambiguous and unreliable electron
affinity determination. A definitive and unambiguous meaning of the EA of
complex heavy systems is recommended.
