Distinct ground state features and the decay chains of Z=121 superheavy nuclei.

A fully systematic study of even and odd isotopes (2 8 1 ≤ A ≤ 3 8 0) of Z = 1 2 1 superheavy nuclei is presented in theoretical frameworks of Relativistic mean-field plus state dependent BCS approach and macroscopic–microscopic approach with triaxially deformed Nilsson-Strutinsky prescription. The ground state properties namely shell correction, binding energy, two- and one-proton and neutron separation energy, shape, deformation, density profile and the radius are estimated that show strong evidences for magicity in N = 1 6 4 , 228. Central depletion in the charge density due to large repulsive Coulomb field indicating bubble like structure is reported. A comprehensive analysis for the possible decay modes specifically α -decay and spontaneous fission (SF) is presented and the probable α -decay chains are evaluated. Results are compared with Finite Range Droplet Model (FRDM) calculations and the available experimental data which show excellent agreement. [ABSTRACT FROM AUTHOR]