Dynamical Triaxial Correlations in the Charge Radii of Neutron-Rich Ruthenium Isotopes
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 106−114Ru 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.
Related
- Growth of quartet correlations in neutron-rich tellurium isotopes within quartet Bardeen-Cooper-Schrieffer theory
- Gamow-Teller transitions in Ge isotopes: effect of many-body correlations and two-body currents
- Density-driven α-particle clustering in neutron-rich oxygen isotopes
- Trace isotopes set the neutron horizon of liquid argon
- Lifetime measurements in neutron-rich odd-A yttrium isotopes (93−99Y): Investigation of shape coexistence and the intertwined quantum phase transition
BibTeX
@misc{wang2026dynamical,
title = {{Dynamical Triaxial Correlations in the Charge Radii of Neutron-Rich Ruthenium Isotopes}},
author = {Y. K. Wang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.27546},
eprint = {2610.27546},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.27546},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Dynamical Triaxial Correlations in the Charge Radii of Neutron-Rich Ruthenium Isotopes
AU - Y. K. Wang
PY - 2026
DA - 2026/10/20
PB - arXiv
DO - 10.48550/arxiv.2610.27546
UR - https://arxiv.org/abs/2610.27546
AB - 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 ^106−114Ru 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.
ER -