Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell
- Watanabe, H.
- Zhang, G.X.
- Yoshida, K.
- Walker, P.M.
- Liu, J.J.
- Wu, J.
- Regan, P.H.
- Söderström, P.-A.
- Kanaoka, H.
- Korkulu, Z.
- Lee, P.S.
- Nishimura, S.
- Yagi, A.
- Ahn, D.S.
- Alharbi, T.
- Baba, H.
- Browne, F.
- Bruce, A.M.
- Carroll, R.J.
- Chae, K.Y.
- Dombradi, Zs.
- Doornenbal, P.
- Estrade, A.
- Fukuda, N.
- Griffin, C.
- Ideguchi, E.
- Inabe, N.
- Isobe, T.
- Kanaya, S.
- Kojouharov, I.
- Kondev, F.G.
- Kubo, T.
- Kubono, S.
- Kurz, N.
- Kuti, I.
- Lalkovski, S.
- Lane, G.J.
- Lee, C.S.
- Lee, E.J.
- Lorusso, G.
- Lotay, G.
- Moon, C.-B.
- Nishizuka, I.
- Nita, C.R.
- Odahara, A.
- Patel, Z.
- Phong, V.H.
- Podolyák, Zs.
- Roberts, O.J.
- Sakurai, H.
- Schaffner, H.
- Shand, C.M.
- Shimizu, Y.
- Sumikama, T.
- Suzuki, H.
- Takeda, H.
- Terashima, S.
- Vajta, Zs.
- Valiente-Dóbon, J.J.
- Xu, Z.Y.
DOIAbstract
AbstractThe 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-a...
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