Low-lying level structure of the neutron-rich nucleus Nb-109 : a possible oblate-shape isomer
Articolo
Data di Pubblicazione:
2011
Citazione:
Low-lying level structure of the neutron-rich nucleus Nb-109 : a possible oblate-shape isomer / H. Watanabe, T. Sumikama, S. Nishimura, K. Yoshinaga, Z. Li, Y. Miyashita, K. Yamaguchi, H. Baba, J.S. Berryman, N. Blasi, A. Bracco, F. Camera, J. Chiba, 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, Y. Shi, K. Steiger, D. Steppenbeck, K. Sugimoto, K. Tajiri, S. Takano, A. Takashima, T. Teranishi, Y. Wakabayashi, P.M. Walker, O. Wieland, F.R. Xu, H. Yamaguchi. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 696:3(2011), pp. 186-190. [10.1016/j.physletb.2010.12.028]
Abstract:
The neutron-rich nuclei Nb-109 and Zr-109 have been populated using in-flight fission of a U-238 beam at 345 MeV/nucleon at the RIBF facility. A T-1/2 = 150(30) ns isomer at 313 keV has been identified in Nb-109 for the first time. The low-lying levels in Nb-109 have been also populated following the beta-decay of Zr-109. Based on the difference in feeding pattern between the isomeric and beta decays, the decay scheme from the isomeric state in Nb-109 was established. The observed hindrances of the electromagnetic transitions deexciting the isomeric state are discussed in terms of possible shape coexistence. Potential energy surface calculations for single-proton configurations predict the presence of low-lying oblate-deformed states in Nb-109.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
109Nb; Isomer; Oblate deformation; Shape coexistence
Elenco autori:
H. Watanabe, T. Sumikama, S. Nishimura, K. Yoshinaga, Z. Li, Y. Miyashita, K. Yamaguchi, H. Baba, J.S. Berryman, N. Blasi, A. Bracco, F. Camera, J. Chiba, 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, Y. Shi, K. Steiger, D. Steppenbeck, K. Sugimoto, K. Tajiri, S. Takano, A. Takashima, T. Teranishi, Y. Wakabayashi, P.M. Walker, O. Wieland, F.R. Xu, H. Yamaguchi
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