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Abstract |
The beta-delayed gamma-ray spectroscopy of neutron-rich Rh-117,Rh-119 isotopes has been investigated at the Radioactive Isotope Beam Factory of RIKEN. The 1/2(-) isomers in Rh-117,Rh-119 have been identified for the first time. The systematics of energy differences between the 9/2(+) and 1/2(-) states have been extended up to N = 74, which shows a tendency to first increase with the neutron number N, then reach a maximum at N approximate to 68, and subsequently decrease. Self-consistent triaxial relativistic Hartree-Bogoliubov (TRHB) calculations highlight the crucial role of triaxial deformation, particularly in the positive-parity states, in driving the observed evolution of energy differences. A shape transition from axially symmetric to triaxial and back to axially symmetric deformation is suggested along the Rh isotopic chain. These findings provide new insights into the structure of neutron-rich nuclei in the A similar to 110 region and motivate further studies of exotic isotopes in this region to explore the interplay between triaxiality and shell evolution. |
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Address |
[Zhang, J. Z.; Qu, T.; Wang, Y. K.; Li, Z. H.; Hua, H.; Zhao, P. W.; Guo, C. Y.; Jiang, D. X.; Jin, Y.; Li, X. Q.; Lou, J. L.; Luo, D. W.; Ni, L.; Wu, H. Y.; Wu, J.; Xu, C.; Ye, Y. L.; Zhang, S. Q.; Zhang, S. Y.; Zhou, Z. X.] Peking Univ, Sch Phys, Beijing 100871, Peoples R China, Email: zhangjizhi@pku.edu.cn; |
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