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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.07194 |
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| _version_ | 1866915842412773376 |
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| author | Budaca, R. Buganu, P. Ouardi, F. El Lahbas, A. |
| author_facet | Budaca, R. Buganu, P. Ouardi, F. El Lahbas, A. |
| contents | The deformation properties within the $^{98-106}$Ru even-even isotopic chain, are investigated by means of the Covariant Density Functional Theory with a Density-Dependent Point-Coupling X parametrization. The considered nuclei are found to exhibit very shallow prolate and triaxial ground state deformation. This information is used to ascertain their dynamical behavior within prolate $γ$-stable and $γ$-unstable instances of a phenomenological Bohr-Mottelson Hamiltonian with an octic potential in the axial deformation variable. The comparative study of the low-lying collective states, revealed the presence of a shape phase transition from low to high deformation, as well as evidence of shape coexistence and mixing between spherical vibrator, $γ$-unstable or prolate configurations in ground and excited states. It is also shown that the effect of shape coexistence and mixing on the $γ$-band states can account to some extent for the typical $γ$-unstable staggering even in prolate $γ$-stable conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_07194 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Shape phase transition, coexistence and mixing in the $^{98-106}$Ru isotopes Budaca, R. Buganu, P. Ouardi, F. El Lahbas, A. Nuclear Theory The deformation properties within the $^{98-106}$Ru even-even isotopic chain, are investigated by means of the Covariant Density Functional Theory with a Density-Dependent Point-Coupling X parametrization. The considered nuclei are found to exhibit very shallow prolate and triaxial ground state deformation. This information is used to ascertain their dynamical behavior within prolate $γ$-stable and $γ$-unstable instances of a phenomenological Bohr-Mottelson Hamiltonian with an octic potential in the axial deformation variable. The comparative study of the low-lying collective states, revealed the presence of a shape phase transition from low to high deformation, as well as evidence of shape coexistence and mixing between spherical vibrator, $γ$-unstable or prolate configurations in ground and excited states. It is also shown that the effect of shape coexistence and mixing on the $γ$-band states can account to some extent for the typical $γ$-unstable staggering even in prolate $γ$-stable conditions. |
| title | Shape phase transition, coexistence and mixing in the $^{98-106}$Ru isotopes |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2603.07194 |