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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.07199 |
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| _version_ | 1866910054335119360 |
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| author | Zang, Jia-nuo Chen, Duo Guo, Rui Li, Jian Yang, Dong Shi, and Yue |
| author_facet | Zang, Jia-nuo Chen, Duo Guo, Rui Li, Jian Yang, Dong Shi, and Yue |
| contents | A microscopic investigation of the rotational properties in $^{129}\mathrm{Cs}$ and $^{131}\mathrm{La}$ was carried out using the three-dimensional tilted axis cranking covariant density functional theory (3DTAC-CDFT). The calculations reveal the coexistence of magnetic and chiral rotation built on identical qusiparticle configurations $π{h}_{11/2}^{1}\otimes ν{h}_{11/2}^{-2}$ in $^{129}\mathrm{Cs}$ and $^{131}\mathrm{La}$, establishing a new type of shape coexistence. The calculations predict the deformation parameters for magnetic rotation in $^{129}\mathrm{Cs}$ ($β\approx0.23$, $γ\approx41^\circ$) and $^{131}\mathrm{La}$ ($β\approx0.25,$ $γ\approx42^\circ$), along with those for possible chiral rotation in $^{129}\mathrm{Cs}$ ($β\approx0.20,$ $γ\approx29^\circ$) and in $^{131}\mathrm{La}$ ($β\approx0.20,$ $γ\approx27^\circ$). The energy spectra, the relation between the spin and the rotational frequency, and the reduced $M1$ and $E2$ transition probabilities are obtained with the various configurations. The experimental characteristics of band B8 in $^{129}\mathrm{Cs}$ and band 13 in $^{131}\mathrm{La}$ are well reproduced. Moreover, a distinctive rotational mode transition is uncovered in this work, progressing from the principal-axis rotation to the planar rotation and finally to the chiral rotation, as the rotational frequency evolves through different regimes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_07199 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The coexistence of possible magnetic and chiral rotation in $^{129}\mathrm{Cs}$ and $^{131}\mathrm{La}$: a microscopic investigation Zang, Jia-nuo Chen, Duo Guo, Rui Li, Jian Yang, Dong Shi, and Yue Nuclear Theory A microscopic investigation of the rotational properties in $^{129}\mathrm{Cs}$ and $^{131}\mathrm{La}$ was carried out using the three-dimensional tilted axis cranking covariant density functional theory (3DTAC-CDFT). The calculations reveal the coexistence of magnetic and chiral rotation built on identical qusiparticle configurations $π{h}_{11/2}^{1}\otimes ν{h}_{11/2}^{-2}$ in $^{129}\mathrm{Cs}$ and $^{131}\mathrm{La}$, establishing a new type of shape coexistence. The calculations predict the deformation parameters for magnetic rotation in $^{129}\mathrm{Cs}$ ($β\approx0.23$, $γ\approx41^\circ$) and $^{131}\mathrm{La}$ ($β\approx0.25,$ $γ\approx42^\circ$), along with those for possible chiral rotation in $^{129}\mathrm{Cs}$ ($β\approx0.20,$ $γ\approx29^\circ$) and in $^{131}\mathrm{La}$ ($β\approx0.20,$ $γ\approx27^\circ$). The energy spectra, the relation between the spin and the rotational frequency, and the reduced $M1$ and $E2$ transition probabilities are obtained with the various configurations. The experimental characteristics of band B8 in $^{129}\mathrm{Cs}$ and band 13 in $^{131}\mathrm{La}$ are well reproduced. Moreover, a distinctive rotational mode transition is uncovered in this work, progressing from the principal-axis rotation to the planar rotation and finally to the chiral rotation, as the rotational frequency evolves through different regimes. |
| title | The coexistence of possible magnetic and chiral rotation in $^{129}\mathrm{Cs}$ and $^{131}\mathrm{La}$: a microscopic investigation |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2505.07199 |