Shape evolution in 116,118Ru: Triaxiality and transition between the O(6) and U(5) dynamical symmetries

P. A. Söderström, G. Lorusso, H. Watanabe, S. Nishimura, P. Doornenbal, G. Thiamova, F. Browne, G. Gey, H. S. Jung, T. Sumikama, J. Taprogge, Zs Vajta, J. Wu, Z. Y. Xu, H. Baba, G. Benzoni, K. Y. Chae, F. C.L. Crespi, N. Fukuda, R. GernhäuserN. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y. K. Kim, I. Kojouharov, F. G. Kondev, T. Kubo, N. Kurz, Y. K. Kwon, G. J. Lane, Z. Li, A. Montaner-Pizá, K. Moschner, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, H. Sakurai, H. Schaffner, G. S. Simpson, K. Steiger, H. Suzuki, H. Takeda, A. Wendt, A. Yagi, K. Yoshinaga

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


116Ru and 118Ru have been studied via β-delayed γ-ray spectroscopy of nuclei produced in fragmentation reactions at the Radioactive Ion-Beam Factory (RIBF) facility. Level schemes with positive-parity states up to spin J=6 have been constructed. The results have been discussed in terms of the interacting boson model, the algebraic collective model, and total Routhian surfaces. We conclude that the very neutron-rich nuclei still show many features associated with triaxial γ-soft nuclei, represented by the O(6) symmetry, but are approaching a spherical structure, the U(5) symmetry, with increasing neutron number towards the N=82 shell closure. In 118Ru, hints of a shape transition in the ground state have been observed.

Original languageEnglish
Article number024301
JournalPhysical Review C - Nuclear Physics
Issue number2
Publication statusPublished - Aug 1 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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