Isomer spectroscopy of neutron-rich 165,167Tb

L. A. Gurgi, P. H. Regan, P. A. Söderström, H. Watanabe, P. M. Walker, Zs Podolyák, S. Nishimura, T. A. Berry, P. Doornenbal, G. Lorusso, T. Isobe, H. Baba, Z. Y. Xu, H. Sakurai, T. Sumikama, W. N. Catford, A. M. Bruce, F. Browne, G. J. Lane, F. G. KondevA. Odahara, J. Wu, H. L. Liu, F. R. Xu, Z. Korkulu, P. Lee, J. J. Liu, V. H. Phong, A. Yagi, G. X. Zhang, T. Alharbi, R. J. Carroll, K. Y. Chae, Zs Dombradi, A. Estrade, N. Fukuda, C. Griffin, E. Ideguchi, N. Inabe, H. Kanaoka, I. Kojouharov, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, E. J. Lee, C. S. Lee, G. Lotay, C. B. Moon, I. Nishizuka, C. R. Nita, Z. Patel, O. J. Roberts, H. Schaffner, C. M. Shand, H. Suzuki, H. Takeda, S. Terashima, Zs Vajta, S. Kanaya, J. J. Valiente-Dobón

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    3 Citations (Scopus)


    We present information on the excited states in the prolate-deformed, neutron-rich nuclei 165,167Tb100,102. The nuclei of interest were synthesised following in-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm 9Be target at the Radioactive Ion-Beam Factory (RIBF), RIKEN, Japan. The exotic nuclei were separated and identified event-by-event using the BigRIPS separator, with discrete energy gamma-ray decays from isomeric states with half-lives in the μs regime measured using the EURICA gamma-ray spectrometer. Metastable-state decays are identified in 165Tb and 167Tb and interpreted as arising from hindered E1 decay from the 7/2 - [523] single quasi-proton Nilsson configuration to rotational states built on the 3/2 - [411] single quasi-proton ground state. These data correspond to the first spectroscopic information in the heaviest, odd-A terbium isotopes reported to date and provide information on proton Nilsson configurations which reside close to the Fermi surface as the 170Dy doubly-midshell nucleus is approached.

    Original languageEnglish
    Pages (from-to)601-608
    Number of pages8
    JournalActa Physica Polonica B
    Issue number3
    Publication statusPublished - Mar 2017


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