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Shape evolution in neutron-rich Rh isotopes; First measurement of negative-parity isomers in $$^{117,119}$$Rh

Zhang, J. Z.*; Chen, Z. Q.*; Qu, T.*; Wang, Y. K.*; Li, Z. H.*; Orlandi, R.   ; 62 of others*

At the RIKEN, $$beta$$-delayed $$gamma$$-ray spectroscopy studies were conducted on $$^{117}$$Rh and $$^{119}$$Rh, resulting in the world's first successful identification of a 1/2$$^-$$ isomer in these isotope, extending the energy difference between the 9/2$$^+$$ and 1/2$$^-$$ states up to neutron number $$N$$=74. Comparison of the new results with state-of-the-art calculations suggests that triaxial deformation plays a significant role in the evolution of the energy difference, indicating a shape transition from axially symmetric to triaxial deformation within the Rh isotopic series. These findings provide new insights into the structure of neutron-rich nuclei in the atomic number $$A sim 110$$ region, elucidating the interplay between triaxial deformation and shell evolution.

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English

Journal

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Physics Letters B

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873

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Pages

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p.140144_1 - 140144_9

Publication Year/Month

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2026/02

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Paper URL

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https://doi.org/10.1016/j.physletb.2025.140144

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no keyword

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Press Release

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