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 and Xiaoguang Wu |
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| Institution: | (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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