Physics Letters B (May 2019)
New isomers in 125Pd79 and 127Pd81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure
- H. Watanabe,
- H.K. Wang,
- G. Lorusso,
- S. Nishimura,
- Z.Y. Xu,
- T. Sumikama,
- P.-A. Söderström,
- P. Doornenbal,
- F. Browne,
- G. Gey,
- H.S. Jung,
- J. Taprogge,
- Zs. Vajta,
- J. Wu,
- A. Yagi,
- H. Baba,
- G. Benzoni,
- K.Y. Chae,
- F.C.L. Crespi,
- N. Fukuda,
- R. Gernhäuser,
- N. Inabe,
- T. Isobe,
- A. Jungclaus,
- D. Kameda,
- G.D. Kim,
- Y.K. Kim,
- I. Kojouharov,
- F.G. Kondev,
- T. Kubo,
- N. Kurz,
- Y.K. Kwon,
- G.J. Lane,
- Z. Li,
- C.-B. Moon,
- A. Montaner-Pizá,
- K. Moschner,
- F. Naqvi,
- M. Niikura,
- H. Nishibata,
- D. Nishimura,
- A. Odahara,
- R. Orlandi,
- Z. Patel,
- Zs. Podolyák,
- H. Sakurai,
- H. Schaffner,
- G.S. Simpson,
- K. Steiger,
- Y. Sun,
- H. Suzuki,
- H. Takeda,
- A. Wendt,
- K. Yoshinaga
Affiliations
- H. Watanabe
- School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China; International Research Center for Nuclei and Particles in the Cosmos, Beihang University, Beijing 100191, China; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Corresponding author at: School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China.
- H.K. Wang
- College of Physics and Telecommunication Engineering, Zhoukou Normal University, Henan 466000, China
- G. Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- S. Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Z.Y. Xu
- Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- T. Sumikama
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
- P.-A. Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- P. Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- F. Browne
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; School of Computing, Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, United Kingdom
- G. Gey
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
- H.S. Jung
- Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
- J. Taprogge
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain; Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
- Zs. Vajta
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; MTA Atomki, O. Box 51, Debrecen, H-4001, Hungary
- J. Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; 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
- H. Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- G. Benzoni
- INFN, Sezione di Milano, via Celoria 16, I-20133 Milano, Italy
- K.Y. Chae
- Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea
- F.C.L. Crespi
- INFN, Sezione di Milano, via Celoria 16, I-20133 Milano, Italy; Dipartimento di Fisica, Universitá di Milano, via Celoria 16, I-20133 Milano, Italy
- N. Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- R. Gernhäuser
- Physik Department, Technische Universität München, D-85748 Garching, Germany
- 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
- A. Jungclaus
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
- D. Kameda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- G.D. Kim
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea
- Y.K. Kim
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea; Department of Nuclear Engineering, Hanyang University, Seoul 133-791, Republic of Korea
- I. Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- F.G. Kondev
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- T. Kubo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- N. Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- Y.K. Kwon
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea
- G.J. Lane
- Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, A.C.T 2601, Australia
- Z. Li
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
- C.-B. Moon
- Department of Display Engineering, Hoseo University, Chung-Nam 336-795, Republic of Korea
- A. Montaner-Pizá
- IFIC, CSIC-Universidad de Valencia, A.C. 22085, E 46071, Valencia, Spain
- K. Moschner
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
- F. Naqvi
- Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520-8120, USA
- M. Niikura
- Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- H. Nishibata
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- D. Nishimura
- Department of Physics, Tokyo City University, Setagaya-ku, Tokyo 158-8557, Japan
- A. Odahara
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
- R. Orlandi
- Instituut voor Kern en Stralingsfysica, KU Leuven, University of Leuven, B-3001 Leuven, Belgium
- 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
- H. Sakurai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- H. Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- G.S. Simpson
- LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
- K. Steiger
- Physik Department, Technische Universität München, D-85748 Garching, Germany
- Y. Sun
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China; Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
- 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
- A. Wendt
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
- K. Yoshinaga
- Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, Japan
- Journal volume & issue
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Vol. 792
pp. 263 – 268
Abstract
The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N=82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in 125Pd79 and 127Pd81 studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity 238U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of (23/2+) and (19/2+) in 125Pd and 127Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus 132Sn.
