Possible shell or sub-shell closure around A=220

Heavy nuclei with Z≥82 are generally less accessible for detailed studies with usual nuclear spectroscopy methods. Therefore the study of half lives via α-decay and/or cluster decay represents one of the main tools for the nuclear structures as well as spectroscopy of ground and excited states of a nuclei in the mass region A=220. Again, the mass region of A ∼ 220 is crucial because there is strong specific evidence that in certain heavy and/or super-heavy regions, octupole-deformed atomic nuclei are distorted into a pear shape. The major purpose of the present study is to examine the α and cluster decay processes in the region of A ∼ 220 of Ra isotopes to predict the existence of spherical shell/sub-shell closures in the daughter lead region within an axially deformed relativistic mean field (RMF) theory with NL3 force parameter set