Publication Date:
2011
Citation:
Structural evolution in the neutron-rich nuclei Zr-106 and Zr-108 / 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. Ideguchi, T. Isobe, Y. Ito, D.G. Jenkins, Y. Kawada, N. Kobayashi, Y. Kondo, R. Kruecken, S. Kubono, G. Lorusso, T. Nakano, M. Kurata Nishimura, A. Odahara, H.J. Ong, S. Ota, Z. Podolyak, 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. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 106:20(2011), pp. 202501.1-202501.4. [10.1103/PhysRevLett.106.202501]
abstract:
The low-lying states in Zr-106 and Zr-108 have been investigated by means of beta-gamma and isomer spectroscopy at the radioactive isotope beam factory (RIBF), respectively. A new isomer with a half-life of 620 +/- 150 ns has been identified in Zr-108. 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 Zr-108 indicates that a spherical subshell gap predicted at N = 70 is not large enough to change the ground state of Zr-108 to the spherical shape. The possibility of a tetrahedral shape isomer in Zr-108 is also discussed.
IRIS type:
01 - Articolo su periodico
Keywords:
transition ; region ; decay
List of contributors:
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. Ideguchi, T. Isobe, Y. Ito, D.G. Jenkins, Y. Kawada, N. Kobayashi, Y. Kondo, R. Kruecken, S. Kubono, G. Lorusso, T. Nakano, M. Kurata Nishimura, A. Odahara, H.J. Ong, S. Ota, Z. Podolyak, 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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