Triaxiality and shape dynamics in $^{70}$Ge
Abstract
The electromagnetic properties of low-lying states in Ge were investigated via multi-step Coulomb excitation of a Ge beam impinging on a Pb target at the ATLAS facility of the Argonne National Laboratory. A total of 27 transitional elements and six diagonal matrix elements coupling 11 low-lying states, were extracted from the measured cross sections. These were used to calculate reduced transition probabilities, spectroscopic quadrupole moments, and rotational invariant shape parameters, providing enhanced precision and expanding on previous studies. The experimental data were compared within several theoretical frameworks, including the generalized triaxial rotor model, configuration interaction shell-model calculations, and computations within the combined frameworks of relativistic density functional theory and the five-dimensional collective Hamiltonian. The results demonstrate a good agreement with the experimental data and, in conjunction with calculations using a two-state mixing model, support significant triaxiality and strong mixing between the and states. This results in the magnitudes of their respective quadrupole deformations being more similar than previously observed. The implications of these results for understanding the complex shape coexistence phenomena, the role of triaxiality, and shape evolution along the Ge isotopic chain are discussed.
Cite
@article{arxiv.2510.11641,
title = {Triaxiality and shape dynamics in $^{70}$Ge},
author = {T. M. Kowalewski and A. D. Ayangeakaa and N. Sensharma and R. V. F. Janssens and Y. M. Wang and Q. B. Chen and J. M. Allmond and C. M. Campbell and S. Carmichael and M. P. Carpenter and P. Copp and C. Cousins and M. Devlin and U. Garg and C. Müller-Gatermann and T. J. Gray and D. J. Hartley and J. Heery and J. Henderson and H. Jayatissa and S. R. Johnson and S. P. Kisyov and F. G. Kondev and T. Lauritsen and S. Nandi and R. Rathod and W. Reviol and M. Rocchini and E. Rubino and R. Russell and A. Saracino and D. Seweryniak and M. Siciliano and C. Y. Wu},
journal= {arXiv preprint arXiv:2510.11641},
year = {2025}
}
Comments
This article contains 15 pages and 13 figures