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

Abstract

A fully systematic study of even and odd isotopes (281 ≤ A ≤ 380) of Z = 121 superheavy nuclei is presented in theoretical frameworks of Relativistic mean-field plus state dependent BCS approach and Macroscopic-Microscopic approach with triaxially deformed Nilson 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 = 164, 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 FRDM calculations and the available experimental data which show excellent agreement.

Structural properties and α-decay chains of transfermium nuclei (101≤Z≤110)

“…The calculations in the relativistic mean-field approach [17,[54][55][56][57][58] have been carried out using the model Lagrangian density with nonlinear terms both for the σ and ω mesons along with NL3* parametrization [59]. The corresponding Dirac equations for nucleons and Klein-Gordon equations for mesons obtained with the mean-field approximation are solved by the expansion method on the widely used axially deformed Harmonic-Oscillator basis [60,61].…”

“…In the calculations, for pairing interaction we apply a delta force, i.e., V = -V 0 δ(r) with the strength V 0 = 350 MeV fm 3 which has been used in Refs. [17,56,57] for the successful description of drip-line nuclei and superheavy nuclei. For further details of these formulations we refer the reader to Refs.…”

“…The great advantage of the relativistic approach is that it automatically implies a description of spin properties without any extra parameters as required in the non-relativistic case. With these comments, we will probe magicity on the basis of single particle levels which are calculated using non-linear version of parameter set (NL3*) [59] and has been used successfully for describing various ground state properties of superheavy nuclei [17,18].…”

“…Though the growth in experimental facilities has provided new dots upto Z=118 on the nuclear landscape but various structural properties are yet to be explored from experimental front. Nevertheless, it has been a long journey by experiments at GSI [1,2], RIKEN [3] and JINR [4][5][6], and also by various theoretical approaches [7][8][9][10][11][12][13][14][15][16][17][18] which has comprehended a fairish part of the unknown territory [19][20][21][22][23][24][25] and still has many miles to go.…”

Study of Decay Modes in Transfermium Isotopes

“…In the calculations we use for the pairing interaction a delta force, i.e., V = -V 0 δ(r) with the strength V 0 = 350 MeV-fm 3 which has been used in Refs. [24,31] for the successful description of bubble nuclei [32][33][34] and also in superheavy nuclei [35,36]. Apart from its simplicity, the applicability and justification of using such a δ-function form of interaction has been discussed in Ref.…”