Structural and decay properties of Z = 132, 138 superheavy nuclei

Abstract

Abstract.In this paper, we analyze the structural properties of Z = 132 and Z = 138 superheavy nuclei within the ambit of axially deformed relativistic mean-field framework with NL3 * parametrization and calculate the total binding energies, radii, quadrupole deformation parameter, separation energies, density distributions. We also investigate the phenomenon of shape coexistence by performing the calculations for prolate, oblate and spherical configurations. For clear presentation of nucleon distributions, the twodimensional contour representation of individual nucleon density and total matter density has been made. Further, a competition between possible decay modes such as α-decay, β-decay and spontaneous fission of the isotopic chain of superheavy nuclei with Z = 132 within the range 312 ≤ A ≤ 392 and 318 ≤ A ≤ 398 for Z = 138 is systematically analyzed within self-consistent relativistic mean field model. From our analysis, we inferred that the α-decay and spontaneous fission are the principal modes of decay in majority of the isotopes of superheavy nuclei under investigation apart from β decay as dominant mode of decay in 318−322 138 isotopes. PACS. PACS-key discribing text of that key -PACS-key discribing text of that key

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

“…Decay properties of various superheavy nuclei [9,10,11,12,13,14] and few possible new shell closures in this unknown territory of superheavy region with Z = 120, 132, 138 and N = 172, 184, 198, 228, 238, 258 [15,16,17, 18] have been reported theoretically. Some ground state properties and decay modes have been studied [19,20,21,22,23,24,25,26] for Z = 119, 120 [27], Z = 121 [23], Z = 122 [28], Z = 120, 124 [29], Z = 123 [30], Z = 122, 124, 126, 128 [31], Z = 124, 126 [32,33], Z = 132, 138 [34] and the search for new shell closures in this region [35,18,36,37] has become a thrust area of research in the recent times. The less explored phenomenon of bubble/semi-bubble structures in superheavy region has also been reported in few recent works [38,39,40,41,42].…”

Structural properties and decay modes of Z = 122, 120 and 118 superheavy nuclei

“…[5][6][7] The search for the possible fusion reactions with the help of available theoretical data on the distinct features and predictions has been going on at GSI, 8, 9 RIKEN 10 and JINR [11][12][13] that are expected to provide useful information in this domain of periodic chart. Various theoretical attempts, [14][15][16][17][18][19][20][21][22][23] in particular, the studies of Z = 118, 24 Z = 118−121, 25 Z = 119, 120, 26 Z = 100−126, 27 Z = 105 ≤ Z ≤ 135, 28 Z = 121, 18, 29 Z = 122, 30 Z = 120, 124, 31 Z = 123, 32 Z = 122, 124, 126, 128, 33 Z = 124, 126, 34,35 Z = 132, 138 36 have significantly contributed to the knowledge of this unexplored region of nuclear landscape. In addition, possible new shell closures, [37][38][39][40][41][42][43][44] the exotic phenomenon of bubble/semi-bubble structures [45][46][47][48] and the possible decay modes 5,7,[14][15][16][17][18][19][20][21]49 are being anticipated in thi...…”