Structural evolution in the neutron-rich Nuclei Zr106 and Zr108

T. Sumikama, K. Yoshinaga, H. Watanabe, S. Nishimura, Y. Miyashita, K. Yamaguchi, K. Sugimoto, J. Chiba, Z. Li, H. Baba, J. S. Berryman, N. Blasi, A. Bracco, F. Camera, P. Doornenbal, S. Go, T. Hashimoto, S. Hayakawa, C. Hinke, E. IdeguchiT. Isobe, Y. Ito, D. G. Jenkins, Y. Kawada, N. Kobayashi, Y. Kondo, R. Krücken, S. Kubono, G. Lorusso, T. Nakano, M. Kurata-Nishimura, A. Odahara, H. J. Ong, S. Ota, Zs Podolyák, H. Sakurai, H. Scheit, K. Steiger, D. Steppenbeck, S. Takano, A. Takashima, K. Tajiri, T. Teranishi, Y. Wakabayashi, P. M. Walker, O. Wieland, H. Yamaguchi

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The low-lying states in Zr106 and Zr108 have been investigated by means of β-γ and isomer spectroscopy at the radioactive isotope beam factory (RIBF), respectively. A new isomer with a half-life of 620±150ns has been identified in Zr108. For the sequence of even-even Zr isotopes, the excitation energies of the first 2+ states reach a minimum at N=64 and gradually increase as the neutron number increases up to N=68, suggesting a deformed subshell closure at N=64. The deformed ground state of Zr108 indicates that a spherical subshell gap predicted at N=70 is not large enough to change the ground state of Zr108 to the spherical shape. The possibility of a tetrahedral shape isomer in Zr108 is also discussed.

Original languageEnglish
Article number202501
JournalPhysical review letters
Issue number20
Publication statusPublished - May 16 2011

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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