Α-Decay Half-Lives of Superdeformed Superheavy Nuclei (original) (raw)

We calculate the binding energy, root-mean-square radius, and quadrupole deformation parameter for the recent, possibly discovered superheavy element Z = 122, using the axially deformed relativistic mean-field (RMF) and nonrelativistic Skyrme Hartree-Fock (SHF) formalisms. The calculation is extended to include various isotopes of Z = 122 element, starting from A = 282 to A = 320. We predict highly deformed structures in the ground state for all the isotopes. A shape transition appears at about A = 290 from a highly oblate to a large prolate shape, which may be considered as the superdeformed and hyperdeformed structures of the Z = 122 nucleus in the mean-field approaches. The most stable isotope (largest binding energy per nucleon) is found to be 302 122, instead of the experimentally observed 292 122.