 Others claimed that none had been detected, and questioned the proposed characteristics of primordial superheavy nuclei.In particular, they cited that any such superheavy nuclei must have a closed neutron shell at "N" = 184 or "N" = 228, and this necessary condition for enhanced stability only exists in neutron deficient isotopes of livermorium or neutron rich isotopes of the other elements that would not be beta-stable unlike most naturally occurring isotopes.This activity was also proposed to be caused by nuclear transmutations in natural cerium, raising further ambiguity upon this claimed observation of superheavy elements.