Physics Letters B (Feb 2016)
Decay spectroscopy of 160Sm: The lightest four-quasiparticle K isomer
- Z. Patel,
- Zs. Podolyák,
- P.M. Walker,
- P.H. Regan,
- P.-A. Söderström,
- H. Watanabe,
- E. Ideguchi,
- G.S. Simpson,
- S. Nishimura,
- F. Browne,
- P. Doornenbal,
- G. Lorusso,
- S. Rice,
- L. Sinclair,
- T. Sumikama,
- J. Wu,
- Z.Y. Xu,
- N. Aoi,
- H. Baba,
- F.L. Bello Garrote,
- G. Benzoni,
- R. Daido,
- Zs. Dombrádi,
- Y. Fang,
- N. Fukuda,
- G. Gey,
- S. Go,
- A. Gottardo,
- N. Inabe,
- T. Isobe,
- D. Kameda,
- K. Kobayashi,
- M. Kobayashi,
- T. Komatsubara,
- I. Kojouharov,
- T. Kubo,
- N. Kurz,
- I. Kuti,
- Z. Li,
- H.L. Liu,
- M. Matsushita,
- S. Michimasa,
- C.-B. Moon,
- H. Nishibata,
- I. Nishizuka,
- A. Odahara,
- E. Şahin,
- H. Sakurai,
- H. Schaffner,
- H. Suzuki,
- H. Takeda,
- M. Tanaka,
- J. Taprogge,
- Zs. Vajta,
- F.R. Xu,
- A. Yagi,
- R. Yokoyama
Affiliations
- 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
- P.M. Walker
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
- P.H. Regan
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
- P.-A. Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- H. Watanabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- E. Ideguchi
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
- G.S. Simpson
- LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
- S. Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- F. Browne
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- P. Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- G. Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- S. Rice
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
- L. Sinclair
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- T. Sumikama
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
- J. Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- Z.Y. Xu
- Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- N. Aoi
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
- H. Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- F.L. Bello Garrote
- Department of Physics, University of Oslo, Oslo, Norway
- G. Benzoni
- INFN Sezione di Milano, I-20133 Milano, Italy
- R. Daido
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- Zs. Dombrádi
- Institute for Nuclear Research, Hungarian Academy of Sciences, P.O. Box 51, Debrecen, H-4001, Hungary
- Y. Fang
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- N. Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- G. Gey
- LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
- S. Go
- Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
- A. Gottardo
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
- 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
- D. Kameda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- K. Kobayashi
- Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
- M. Kobayashi
- Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
- T. Komatsubara
- Research Facility Center for Pure and Applied Science, University of Tsukuba, Ibaraki 305-8577, Japan
- I. Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- T. Kubo
- 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
- Z. Li
- 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
- M. Matsushita
- Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
- S. Michimasa
- Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
- C.-B. Moon
- Hoseo University, Asan, Chungnam 336-795, Republic of Korea
- H. Nishibata
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- I. Nishizuka
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
- A. Odahara
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- E. Şahin
- Department of Physics, University of Oslo, Oslo, Norway
- H. Sakurai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- H. Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- 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
- M. Tanaka
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- J. Taprogge
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
- Zs. Vajta
- Institute for Nuclear Research, Hungarian Academy of Sciences, P.O. Box 51, Debrecen, H-4001, Hungary
- F.R. Xu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
- A. Yagi
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- R. Yokoyama
- Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
- DOI
- https://doi.org/10.1016/j.physletb.2015.12.026
- Journal volume & issue
-
Vol. 753,
no. C
pp. 182 – 186
Abstract
The decay of a new four-quasiparticle isomeric state in 160Sm has been observed using γ-ray spectroscopy at the RIBF, RIKEN. The four-quasiparticle state is assigned a 2π⊗2ν π52−[532], π52+[413], ν52−[523], ν72+[633] configuration. The half-life of this (11+) state is measured to be 1.8(4) μs. The (11+) isomer decays into a rotational band structure, based on a (6−) ν52−[523]⊗ν72+[633] bandhead, consistent with the gK−gR values. This decays to a (5−) two-proton quasiparticle state, which in turn decays to the ground state band. Potential energy surface and blocked-BCS calculations were performed in the deformed midshell region around 160Sm. They reveal a significant influence from β6 deformation and that 160Sm is the best candidate for the lightest four-quasiparticle K isomer to exist in this region. The relationship between reduced hindrance and isomer excitation energy for E1 transitions from multiquasiparticle states is considered with the new data from 160Sm. The E1 data are found to agree with the existing relationship for E2 transitions.
