Physics Letters B (Sep 2016)
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. Chae,
- Zs. 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
Affiliations
- H. Watanabe
- School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
- G.X. Zhang
- School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
- K. Yoshida
- Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
- P.M. Walker
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- J.J. Liu
- Department of Physics, the University of Hong Kong, Pokfulam Road, Hong Kong
- J. Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- P.H. Regan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- P.-A. Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- H. Kanaoka
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- Z. Korkulu
- MTA Atomki, P.O. Box 51, Debrecen, H-4001, Hungary
- P.S. Lee
- Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
- S. Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- A. Yagi
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- D.S. Ahn
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- T. Alharbi
- Department of Physics, College of Science in Zulfi, Almajmaah University, P.O. Box 1712, 11932, Saudi Arabia
- H. Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- F. Browne
- School of Computing Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, United Kingdom
- A.M. Bruce
- School of Computing Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, United Kingdom
- R.J. Carroll
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- K.Y. Chae
- Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea
- Zs. Dombradi
- MTA Atomki, P.O. Box 51, Debrecen, H-4001, Hungary
- P. Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- A. Estrade
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
- N. Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- C. Griffin
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
- E. Ideguchi
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
- N. Inabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- T. Isobe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- S. Kanaya
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- I. Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- F.G. Kondev
- Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
- T. Kubo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- S. Kubono
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- N. Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- I. Kuti
- MTA Atomki, P.O. Box 51, Debrecen, H-4001, Hungary
- S. Lalkovski
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- G.J. Lane
- Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, A.C.T 0200, Australia
- C.S. Lee
- Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
- E.J. Lee
- Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea
- G. Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- G. Lotay
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- C.-B. Moon
- Department of Display Engineering, Hoseo University, Chung-Nam 336-795, Republic of Korea
- I. Nishizuka
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
- C.R. Nita
- School of Computing Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, United Kingdom
- A. Odahara
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- Z. Patel
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- V.H. Phong
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Zs. Podolyák
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- O.J. Roberts
- School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
- H. Sakurai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- H. Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- C.M. Shand
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- Y. Shimizu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- T. Sumikama
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
- H. Suzuki
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- H. Takeda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- S. Terashima
- School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
- Zs. Vajta
- MTA Atomki, P.O. Box 51, Debrecen, H-4001, Hungary
- J.J. Valiente-Dóbon
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, 35020 Legnaro, Italy
- Z.Y. Xu
- Department of Physics, the University of Hong Kong, Pokfulam Road, Hong Kong
- DOI
- https://doi.org/10.1016/j.physletb.2016.07.057
- Journal volume & issue
-
Vol. 760,
no. C
pp. 641 – 646
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.
Keywords
