New isomer found in Sb89 51140: Sphericity and shell evolution between N=82 and N=90

R. Lozeva, H. Naïdja, F. Nowacki, J. Dudek, A. Odahara, C. B. Moon, S. Nishimura, P. Doornenbal, J. M. Daugas, P. A. Söderström, T. Sumikama, G. Lorusso, J. Wu, Z. Y. Xu, H. Baba, F. Browne, R. Daido, Y. Fang, T. Isobe, I. KojouharovN. Kurz, Z. Patel, S. Rice, H. Sakurai, H. Schaffner, L. Sinclair, H. Watanabe, A. Yagi, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki, N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, D. Murai, F. L.Bello Garrote, F. Didierjean, E. Ideguchi, T. Ishigaki, H. S. Jung, T. Komatsubara, Y. K. Kwon, P. Lee, C. S. Lee, S. Morimoto, M. Niikura, H. Nishibata, I. Nishizuka

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20 Citations (Scopus)


In this article we report on the first spectroscopic information on Sb8951140 and the observation of an isomer in this nucleus with T1/2=41(8) μs. It is located in close proximity to Sn140 for N=90, where the νf7/2 orbit is completely filled. The possible origin of the isomeric state is a πg7/21×νf7/2-1 coupling configuration, resulting in a (6-) or (7-) spin-parity. This is likely caused by an inversion of the πg7/2 and πd5/2 orbitals at N=89. The existence of such an isomer far from stability is discussed extensively in the context of shell-model calculations and compared to results from mean-field calculations performed using a deformed Woods-Saxon potential. Both approaches suggest the observation of a single-particle excitation mode at an extreme neutron number.

Original languageEnglish
Article number014316
JournalPhysical Review C
Issue number1
Publication statusPublished - Jan 25 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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