Physics Letters B (Dec 2019)
Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy
- G.X. Zhang,
- H. Watanabe,
- G.D. Dracoulis,
- F.G. Kondev,
- G.J. Lane,
- P.H. Regan,
- P.-A. Söderström,
- P.M. Walker,
- K. Yoshida,
- H. Kanaoka,
- Z. Korkulu,
- P.S. Lee,
- J.J. Liu,
- S. Nishimura,
- J. Wu,
- A. Yagi,
- D.S. Ahn,
- T. Alharbi,
- H. Baba,
- F. Browne,
- A.M. Bruce,
- M.P. Carpenter,
- R.J. Carroll,
- K.Y. Chae,
- C.J. Chiara,
- Zs. Dombradi,
- P. Doornenbal,
- A. Estrade,
- N. Fukuda,
- C. Griffin,
- E. Ideguchi,
- N. Inabe,
- T. Isobe,
- S. Kanaya,
- I. Kojouharov,
- T. Kubo,
- S. Kubono,
- N. Kurz,
- I. Kuti,
- S. Lalkovski,
- T. Lauritsen,
- C.S. Lee,
- E.J. Lee,
- C.J. Lister,
- G. Lorusso,
- G. Lotay,
- E.A. McCutchan,
- C.-B. Moon,
- I. Nishizuka,
- C.R. Nita,
- A. Odahara,
- Z. Patel,
- V.H. Phong,
- Zs. Podolyák,
- O.J. Roberts,
- H. Sakurai,
- H. Schaffner,
- D. Seweryniak,
- C.M. Shand,
- Y. Shimizu,
- T. Sumikama,
- H. Suzuki,
- H. Takeda,
- S. Terashima,
- Zs. Vajta,
- J.J. Valiente-Dóbon,
- Z.Y. Xu,
- S. Zhu
Affiliations
- G.X. Zhang
- IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
- H. Watanabe
- IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Corresponding author at: Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, P.R. China.
- G.D. Dracoulis
- Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, ACT 2601, Australia
- F.G. Kondev
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- G.J. Lane
- Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, ACT 2601, Australia
- P.H. Regan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, United Kingdom
- P.-A. Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- P.M. Walker
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- K. Yoshida
- Department of Physics, Kyoto University, Kyoto, 606-8502, 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
- J.J. Liu
- Department of Physics, the University of Hong Kong, Pokfulam Road, Hong Kong
- S. Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- J. Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Department of Physics, Peking University, Beijing 100871, China
- 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, Majmaah University, Majmaah 11952, 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
- M.P. Carpenter
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- 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
- C.J. Chiara
- Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
- 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
- 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
- T. Lauritsen
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- 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
- C.J. Lister
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- G. Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, United Kingdom
- G. Lotay
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- E.A. McCutchan
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- 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; Horia Hulubei National Institute for R & D in Physics and Nuclear Engineering (IFIN-HH), Bucharest-Magurele 077125, 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
- V.H. Phong
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; VNU Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam
- 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
- D. Seweryniak
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- 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
- IRCNPC, 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
- S. Zhu
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- Journal volume & issue
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Vol. 799
Abstract
The neutron-rich dysprosium isotopes 168Dy102 and 169Dy103 have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For 168Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched 170Er target performed at Argonne National Laboratory. This isomer is assigned Jπ=Kπ=(4−) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N=102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In 169Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ=(1/2−) isomeric state at 166 keV to the Kπ=(5/2−) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N=103 isotone 173Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.
