arXiv subjects

Yi-Ming Jiang

Publications and source records attributed to Yi-Ming Jiang.

2 recordsLinked to original sources

arXiv2026

Flat "Island of Stability" of Superheavy Nuclei

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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arXiv2026

Octupole correlations in $^{220,222,224,226}$Rn

The octupole correlations in $^{220,222,224,226}$Rn are investigated by using multi-dimensionally constrained covariant density functional theory. The ground-state properties and potential energy surfaces are analyzed, revealing that octupole deformation appears in $^{222,224}$Rn, but not in $^{220,226}$Rn. The relationship between pairing correlations and octupole deformation is examined, showing that the neutron pairing energy decreases as octupole deformation develops, whereas the proton pairing energy shows the opposite behavior. The microscopic origin of octupole correlations in these radon isotopes are explored based on an examination of the single-particle levels near the Fermi surface and a schematic two-level model. Experiments have indicated that these isotopes undergo octupole vibrations and the present prediction of octupole deformation in $^{222,224}$Rn awaits further confirmation.

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