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arXiv · 2610.27546

Dynamical Triaxial Correlations in the Charge Radii of Neutron-Rich Ruthenium Isotopes

Y. K. Wang
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Abstract

Nuclear charge radii are fundamental observables that track changes in nuclear structure. Recent measurements of neutron-rich Ru isotopes, interpreted using mean-field density-functional calculations, have highlighted the sensitivity of charge radii to static triaxial deformation. Whether dynamical shape fluctuations involving triaxial configurations---known to affect both nuclear ground- and excited-state properties---can reshape the charge-radii evolution remains unresolved. In this Letter, we investigate the charge radii of even-even neutron-rich $^{106-114}$Ru within a nuclear density-functional framework that combines three-dimensional angular-momentum projection with the generator-coordinate method. Including dynamical triaxial shape fluctuations yields charge radii in good agreement with experiment, without introducing additional adjustable parameters. By successively incorporating static triaxial deformation, dynamical axial shape fluctuations, and dynamical triaxial shape fluctuations, we trace how the predicted charge radii change at each step. These results demonstrate that triaxial shape dynamics can leave a substantial imprint on charge radii. They also inform the interpretation of experimental charge-radius measurements used to trace the evolution of nuclear structure, since charge radii alone cannot uniquely determine the underlying nuclear shape.

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BibTeXRIS

Y. K. Wang. 2026-10-20. Dynamical Triaxial Correlations in the Charge Radii of Neutron-Rich Ruthenium Isotopes. https://arxiv.org/abs/2610.27546

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