Evolution from quasivibrational to quasirotational structure in 155Tm and yrast 27/2− to 25/2− energy anomaly in the A ≈ 150 mass region

Liu, L. ; Wang, S. Y. ; Wang, S. ; Hua, H. ; Zhang, S. Q. ; Meng, Jie ; Bark, R. A. ; Wyngaardt, S. M. ; Qi, B. ; Sun, D. P. ; Liu, C. ; Li, Z. Q. ; Jia, H. ; Li, X. Q. ; Xu, C. ; Li, Z. H. ; Sun, J. J. ; Zhu, L. H. ; Jones, P. ; Lawrie, E. A. ; Lawrie, J. J. ; Wiedeking, M. ; Bucher, T. D. ; Dinoko, T. ; Makhathini, L. ; Majola, S. N. T. ; Noncolela, S. P. ; Shirinda, O. ; Gal, J. ; Kalinka, G. ; Molnar, J. ; Nyako, B. M. ; Timar, J. ; Juhasz, K. ; Arogunjo, M. (2019)

CITATION: Liu, L., et al. 2018. Evolution from quasivibrational to quasirotational structure in 155Tm and yrast 27/2− to 25/2− energy anomaly in the A ≈ 150 mass region. Physical Review C, 97(4):044306, doi:10.1103/PhysRevC.97.044306.

The original publication is available at https://journals.aps.org/prc

Article

Excited states in 155Tm have been populated via the reaction 144Sm(16O, p4n)155Tm at a beam energy of 118 MeV. The ground-state band has been extended and a new side band of the ground-state band is identified. E-GOS curves and potential energy surface calculations are employed to discuss the structure evolution of the ground-state band. The newly observed side band in 155Tm is discussed based on the spin/energy systematics. In particular, the phenomenon of seniority inversion is proposed in 155Tm, and a systematic study of this phenomenon in the A ≈ 150 mass region is performed.

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