Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell

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

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Abstract

The level structure of 172Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a 238U beam. A long-lived isomeric state with T1/2=0.71(5) s and Kπ=8 has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus 172Ho via allowed β decays. The robust nature of the Kπ=8 isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.

Original languageEnglish
Pages (from-to)641-646
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume760
DOIs
StatePublished - Sep 10 2016

Keywords

  • Axial symmetry
  • Decay spectroscopy
  • Dy
  • K isomer
  • γ vibration

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