Search for the stable isotopes for Z = 119 and 121 superheavy elements using relativistic mean field model

Abstract

An extensive study on the search of stable isotopes for Z = 119 and 121 superheavy nuclei is performed within relativistic mean field model with NL3 force for axially deformed nuclei. Our search is accomplished in the mass region, 289 ≤ A ≤ 339. The ground state properties such as binding energy, quadrupole deformation, root-mean square radius etc are calculated and compared with finite range droplet model (FRDM). Calculated results are found to be in good agreement with FRDM results. The stability of superheavy isotopes against all the elementary decay modes (α-decay, β-decay and spontaneous fission) are studied. The most stable isotopes are chosen by scrutinizing their various nuclear properties. For Z = 119, the stable isotopes are found to be 291,292119, 294-298119 and for Z = 121, only isotope 297121 found to be relatively more stable in their considered isotopic chain. The predicted stable isotopes in the superheavy region along their isotopic chain, are found near the proton drip line. Further, the single particle spectrum and deform density profile along different direction are shown for few predicted stable isotopes, to gather a sound knowledge on the their features.