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arXiv · 2611.09099

Flat "Island of Stability" of Superheavy Nuclei

Yi-Ming Jiang·Xiao Lu·T. M. Shneidman·N. V. Antonenko·Shan-Gui Zhou
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Abstract

We present the first systematic microscopic calculations of fission barrier heights for 292 even-even superheavy nuclei using the multidimensionally constrained relativistic mean field model with triaxial and octupole deformations treated simultaneously. The calculated barrier heights remain around 5 MeV in the vicinity of the predicted doubly magic nucleus ${}^{304}120$. This flat landscape contrasts with the conventional picture of mutually enhanced magicity and indicates that the proton shell closure at $Z=120$ and the neutron shell closure at $N=184$ do not reinforce but suppress each other. We introduce an $α$-linked energy difference $Δ_{\rm pn}$ to identify the mutually suppressed magicity caused by distinct proton and neutron density distributions. These results challenge the expected shell landscape of superheavy nuclei and may have a crucial impact on estimating survival probabilities in the synthesis of superheavy nuclei.

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Yi-Ming Jiang, Xiao Lu, T. M. Shneidman, N. V. Antonenko, Shan-Gui Zhou. 2026-11-06. Flat "Island of Stability" of Superheavy Nuclei. https://arxiv.org/abs/2611.09099

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