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Triaxiality and shape dynamics in $^{70}$Ge

Fuente: arXiv

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Auteurs principaux:	Kowalewski, T. M., Ayangeakaa, A. D., Sensharma, N., Janssens, R. V. F., Wang, Y. M., Chen, Q. B., Allmond, J. M., Campbell, C. M., Carmichael, S., Carpenter, M. P., Copp, P., Cousins, C., Devlin, M., Garg, U., Müller-Gatermann, C., Gray, T. J., Hartley, D. J., Heery, J., Henderson, J., Jayatissa, H., Johnson, S. R., Kisyov, S. P., Kondev, F. G., Lauritsen, T., Nandi, S., Rathod, R., Reviol, W., Rocchini, M., Rubino, E., Russell, R., Saracino, A., Seweryniak, D., Siciliano, M., Wu, C. Y.
Format:	Preprint
Publié:	2025
Sujets:	Nuclear Experiment
Accès en ligne:	Acceder al recurso
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_version_	1866914090607181824
author	Kowalewski, T. M. Ayangeakaa, A. D. Sensharma, N. Janssens, R. V. F. Wang, Y. M. Chen, Q. B. Allmond, J. M. Campbell, C. M. Carmichael, S. Carpenter, M. P. Copp, P. Cousins, C. Devlin, M. Garg, U. Müller-Gatermann, C. Gray, T. J. Hartley, D. J. Heery, J. Henderson, J. Jayatissa, H. Johnson, S. R. Kisyov, S. P. Kondev, F. G. Lauritsen, T. Nandi, S. Rathod, R. Reviol, W. Rocchini, M. Rubino, E. Russell, R. Saracino, A. Seweryniak, D. Siciliano, M. Wu, C. Y.
author_facet	Kowalewski, T. M. Ayangeakaa, A. D. Sensharma, N. Janssens, R. V. F. Wang, Y. M. Chen, Q. B. Allmond, J. M. Campbell, C. M. Carmichael, S. Carpenter, M. P. Copp, P. Cousins, C. Devlin, M. Garg, U. Müller-Gatermann, C. Gray, T. J. Hartley, D. J. Heery, J. Henderson, J. Jayatissa, H. Johnson, S. R. Kisyov, S. P. Kondev, F. G. Lauritsen, T. Nandi, S. Rathod, R. Reviol, W. Rocchini, M. Rubino, E. Russell, R. Saracino, A. Seweryniak, D. Siciliano, M. Wu, C. Y.
contents	The electromagnetic properties of low-lying states in $^{70}$Ge were investigated via multi-step Coulomb excitation of a $^{70}$Ge beam impinging on a $^{208}$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 $0^+_1$ and $0^+_2$ states. This results in the magnitudes of their respective quadrupole deformations $[β_\text{rms}(0^+_1) = 0.228\,(3),\,β_\text{rms}(0^+_2) = 0.273\,(1)]$ 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.
format	Preprint
id	arxiv_https___arxiv_org_abs_2510_11641
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Triaxiality and shape dynamics in $^{70}$Ge Kowalewski, T. M. Ayangeakaa, A. D. Sensharma, N. Janssens, R. V. F. Wang, Y. M. Chen, Q. B. Allmond, J. M. Campbell, C. M. Carmichael, S. Carpenter, M. P. Copp, P. Cousins, C. Devlin, M. Garg, U. Müller-Gatermann, C. Gray, T. J. Hartley, D. J. Heery, J. Henderson, J. Jayatissa, H. Johnson, S. R. Kisyov, S. P. Kondev, F. G. Lauritsen, T. Nandi, S. Rathod, R. Reviol, W. Rocchini, M. Rubino, E. Russell, R. Saracino, A. Seweryniak, D. Siciliano, M. Wu, C. Y. Nuclear Experiment The electromagnetic properties of low-lying states in $^{70}$Ge were investigated via multi-step Coulomb excitation of a $^{70}$Ge beam impinging on a $^{208}$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 $0^+_1$ and $0^+_2$ states. This results in the magnitudes of their respective quadrupole deformations $[β_\text{rms}(0^+_1) = 0.228\,(3),\,β_\text{rms}(0^+_2) = 0.273\,(1)]$ 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.
title	Triaxiality and shape dynamics in $^{70}$Ge
topic	Nuclear Experiment
url	https://arxiv.org/abs/2510.11641