Alpha-decay properties of superheavy elements $Z=113-125$ in the relativistic mean-field theory with vector self-coupling of $\omega$ meson

Abstract

We have investigated properties of $\alpha$-decay chains of recently produced superheavy elements Z=115 and Z=113 using the new Lagrangian model NL-SV1 with inclusion of the vector self-coupling of $\omega$ meson in the framework of the relativistic mean-field theory. It is shown that the experimentally observed alpha-decay energies and half-lives are reproduced well by this Lagrangian model. Further calculations for the heavier elements with Z=117-125 show that these nuclei are superdeformed with a prolate shape in the ground state. A superdeformed shell-closure at Z=118 lends an additional binding and an extra stability to nuclei in this region. Consequently, it is predicted that the corresponding $Q_{\alpha }$ values provide $\alpha$-decay half-lives for heavier superheavy nuclei within the experimentally feasible conditions. The results are compared with those of macroscopic-microscopic approaches. A perspective of the difference in shell effects amongst various approaches is presented and its consequences on superheavy nuclei are discussed.

Revised version, 14 pages, 12 eps figures. To appear in PRC. Discussion on shell effects is shortened in the revised version. However, commonality of the role of shell effects in extreme superheavy regions and in the regions near the r-process path is maintained. Existence of a secondary superdeformed minimum for Z=113 is verified with another Lagrangian set

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Cited by in corpus (14)

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• Feasibility of observing the α decay chains from isotopes of SHN with Z = 128, Z = 126, Z = 124 and Z = 122
• Effects of the density dependence of nuclear symmetry energy on properties of superheavy nuclei
• Predictions on the alpha decay chains of superheavy nuclei with Z =121 within the range 290 $\le$ A $\le$ 339
• Decay studies of ${}^{288-287}115$ alpha-decay chains
• Superheavy nuclei with the vector self-coupling of the $\omega$-meson in the relativistic mean-field theory
• Distinct ground state features and the decay chains of Z = 121 Superheavy Nuclei
• The stability and the shape of the heaviest nuclei
• Structural and decay properties of nuclei appearing in the $\alpha$-decay chains of ${}^{296,298,300,302,304}$120 within the relativistic mean-field formalism
• Theoretical studies on structural properties and decay modes of ${}^{284-375}$119 isotopes