Long-lived K isomer and enhanced gamma vibration in the neutron-rich nucleus Dy-172: Collectivity beyond double midshell
- Watanabe, H.
- Zhang, G. X.
- Yoshida, K.
- Walker, P. M.
- Liu, J. J.
- Wu, J.
- Regan, P. H.
- Soderstrom, 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, R.
- 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.
- Lorussoc, G.
- Lotay, G.
- Moon, C.B.
- Nishizuka, I.
DOIAbstract
The level structure of Dy-172 has been investigated for the first time by means of decay spectroscopy following in-flight fission of a U-238 beam. A long-lived isomeric state with T-1/2 = 0.71(5) s and K-pi = 8(-) has been identified at 1278 keV, which decays to the ground-state and gamma-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus Ho-172 via allowed beta decays The robust nature of the K-pi = 8(-) isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the gamma-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic...
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