Physics Letters B (Nov 2016)
K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy
- P.-A. Söderström,
- P.M. Walker,
- J. Wu,
- H.L. Liu,
- P.H. Regan,
- H. Watanabe,
- P. Doornenbal,
- Z. Korkulu,
- P. Lee,
- J.J. Liu,
- G. Lorusso,
- S. Nishimura,
- V.H. Phong,
- T. Sumikama,
- F.R. Xu,
- A. Yagi,
- G.X. Zhang,
- D.S. Ahn,
- T. Alharbi,
- H. Baba,
- F. Browne,
- A.M. Bruce,
- R.J. Carroll,
- K.Y. Chae,
- Zs. Dombradi,
- A. Estrade,
- N. Fukuda,
- C.J. Griffin,
- E. Ideguchi,
- N. Inabe,
- T. Isobe,
- H. Kanaoka,
- S. Kanaya,
- I. Kojouharov,
- F.G. Kondev,
- T. Kubo,
- S. Kubono,
- N. Kurz,
- I. Kuti,
- S. Lalkovski,
- G.J. Lane,
- E.J. Lee,
- C.S. Lee,
- G. Lotay,
- C.-B. Moon,
- I. Nishizuka,
- C.R. Niţă,
- A. Odahara,
- Z. Patel,
- Zs. Podolyák,
- O.J. Roberts,
- H. Sakurai,
- H. Schaffner,
- C.M. Shand,
- H. Suzuki,
- H. Takeda,
- S. Terashima,
- Zs. Vajta,
- J.J. Valiente-Dòbon,
- Z.Y. Xu
Affiliations
- P.-A. Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan; Corresponding author.
- P.M. Walker
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
- J. Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan; School of Physics, Peking University, Beijing 100871, China
- H.L. Liu
- Department of Applied Physics, School of Science, Xi'an Jiaotong University, Xi'an 710049, China
- P.H. Regan
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, United Kingdom
- H. Watanabe
- International Research Center for Nuclei and Particles in the Cosmos, Beihang University, Beijing 100191, China; School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
- P. Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- Z. Korkulu
- Institute for Nuclear Research, Hungarian Academy of Sciences, P.O. Box 51, Debrecen, H-4001, Hungary
- P. Lee
- Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
- J.J. Liu
- Department of Physics, the University of Hong Kong, Pokfulam Road, Hong Kong
- G. Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, United Kingdom
- S. Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- V.H. Phong
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan; VNU Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam
- T. Sumikama
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
- F.R. Xu
- School of Physics, Peking University, Beijing 100871, China
- A. Yagi
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043, Toyonaka, Japan
- G.X. Zhang
- School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
- D.S. Ahn
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, 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-shi, 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
- Institute for Nuclear Research, Hungarian Academy of Sciences, P.O. Box 51, Debrecen, H-4001, Hungary
- A. Estrade
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
- N. Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- C.J. Griffin
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
- E. Ideguchi
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043, Toyonaka, Japan; Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
- N. Inabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- T. Isobe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- H. Kanaoka
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043, Toyonaka, 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-shi, Saitama 351-0198, Japan
- S. Kubono
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- N. Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- I. Kuti
- Institute for Nuclear Research, Hungarian Academy of Sciences, 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
- E.J. Lee
- Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea
- C.S. Lee
- Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
- G. Lotay
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
- C.-B. Moon
- Hoseo University, Asan, Chungnam 336-795, Republic of Korea
- I. Nishizuka
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
- C.R. Niţă
- School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom; Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), RO-077125 Bucharest, Romania
- 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
- 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-shi, Saitama 351-0198, Japan; Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, 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
- H. Suzuki
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- H. Takeda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- S. Terashima
- School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
- Zs. Vajta
- Institute for Nuclear Research, Hungarian Academy of Sciences, P.O. Box 51, Debrecen, H-4001, Hungary
- J.J. Valiente-Dòbon
- 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
- Journal volume & issue
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Vol. 762
pp. 404 – 408
Abstract
A detailed study of the structure of the doubly mid-shell nucleus Dy104166170 has been carried out, following isomeric and β decay. We have measured the yrast band up to the spin-parity Jπ=6+ state, the K=2 γ-vibration band up to the 5+ state, a low-lying negative-parity band based on a 2− state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the Kπ=6+ two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the ground-state band an order of magnitude lower than predicted by NpNn systematics. This is interpreted as being due to γ-vibrational mixing from a near degeneracy of the isomer and the 6+ state of the γ band. Furthermore, the parent nucleus 170Tb has been determined to have a half-life of 0.91(−13+18) s with a possible spin-parity of 2−. Keywords: K isomer, Dysprosium, Mid-shell, γ-Ray spectroscopy
