Observation of signature inversion in the πh9/2?vi13/2 oblate band |
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Authors: | Chengying Xie Xiaohong Zhou Yuhu Zhang Yingxiang Guo Xiangguo Lei Yong Zheng Minliang Liu Litao Song Hualei Wang Haiping Yu Wentao Guo Peng Luo Zhijun Wu Lihua Zhu Xiaoguang Wu |
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Affiliation: | (1) Institute of Modern Physics, Chinese Academy of Sciences, 730000 Lanzhou, China;(2) Graduate School of the Chinese Academy of Sciences, 100049 Beijing, China;(3) Institute of Atomic Energy Research, 102413 Beijing, China |
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Abstract: | High-spin states in 190Tl have been studied via the 160Gd(35Cl, 5nγ) reaction. The level scheme, consisting of the πh 9/2⊗vi 13/2 oblate band and a cascade with character of single particle excitations, has been established. Spin values have been firmly assigned to the oblate band in 190Tl, resulting in low-spin signature inversion in the πh 9/2⊗vi 13/2 oblate band for the first time. Based on the similarity of the level structure in doubly odd Tl nuclei, spin values for the oblate bands in 192–200Tl should be re-assigned, and a consistent low-spin signature inversion has occurred in these oblate deformed nuclei. The low-spin signature inversion phenomena can be interpreted qualitatively by using the 2-quasiparticle plus rotor model including p-n residual interactions. |
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Keywords: | deformed odd-odd 190Tl oblate rotational bands signature inversion 2-qp+rotor model |
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