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Sahin E, Hadynska-Kle¸k K, Bello Garrote F, Görgen A. Probing the nuclear structure in the vicinity of 78Ni. EPJ WEB OF CONFERENCES 2019. [DOI: 10.1051/epjconf/201922301054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Theoretical and experimental studies of neutron-rich nuclei have shown that the general concept of shell structure is not as robust and universal as earlier thought, but can exhibit significant changes as a function of neutron excess. New magic numbers appear and some other conventional ones disappear mainly because of a different ordering of the single-particle orbitals. In the present contribution, recent experimental studies of neutron-rich Cu isotopes, performed at RIKEN using β decay and one-proton knockout reactions, will be discussed. Neutron-rich nuclei near 78Ni were populated through in-flight fission of 238U on thick 9Be targets in both experiments. In the β-decay study, 75,77Ni nuclei were implanted into the WAS3ABi silicon array, while γ rays from excited states in 75,77Cu emitted after β decay of the implanted ions were detected with the EURICA Ge detector array that was surrounding the active stopper. In a second experiment within the SEASTAR campaign at RIKEN, the same 75,77Cu nuclei were produced in (p,2p) knockout reactions from 76,78Zn beam particles at around 250 MeV/nucleon impinging onto the MINOS liquid hydrogen target. In the latter experiment the DALI2 NaI array was used to detect de-excitation γ rays measured in coincidence with Cu nuclei identified in the Zero Degree Spectrometer. Both studies are complimentary and greatly contribute to our understanding on the nuclear structure in the 78Ni region.
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2
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Welker A, Althubiti NAS, Atanasov D, Blaum K, Cocolios TE, Herfurth F, Kreim S, Lunney D, Manea V, Mougeot M, Neidherr D, Nowacki F, Poves A, Rosenbusch M, Schweikhard L, Wienholtz F, Wolf RN, Zuber K. Binding Energy of ^{79}Cu: Probing the Structure of the Doubly Magic ^{78}Ni from Only One Proton Away. PHYSICAL REVIEW LETTERS 2017; 119:192502. [PMID: 29219497 DOI: 10.1103/physrevlett.119.192502] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Indexed: 06/07/2023]
Abstract
The masses of the neutron-rich copper isotopes ^{75-79}Cu are determined using the precision mass spectrometer ISOLTRAP at the CERN-ISOLDE facility. The trend from the new data differs significantly from that of previous results, offering a first accurate view of the mass surface adjacent to the Z=28, N=50 nuclide ^{78}Ni and supporting a doubly magic character. The new masses compare very well with large-scale shell-model calculations that predict shape coexistence in a doubly magic ^{78}Ni and a new island of inversion for Z<28. A coherent picture of this important exotic region begins to emerge where excitations across Z=28 and N=50 form a delicate equilibrium with a spherical mean field.
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Affiliation(s)
- A Welker
- Technische Universität Dresden, 01069 Dresden, Germany
- CERN Geneva, 1211 Geneva, Switzerland
| | - N A S Althubiti
- University of Manchester, Manchester M13 9PL, United Kingdom
| | - D Atanasov
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - K Blaum
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - T E Cocolios
- KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
| | - F Herfurth
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - S Kreim
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - D Lunney
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France
| | - V Manea
- CERN Geneva, 1211 Geneva, Switzerland
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - M Mougeot
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France
| | - D Neidherr
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - F Nowacki
- Université de Strasbourg, IPHC, 67037 Strasbourg, France
- CNRS, UMR7178, 67037 Strasbourg, France
| | - A Poves
- Departamento de Física Teórica and IFT-UAM/CSIC, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
- Institute for Advanced Study, Université de Strasbourg, 67083 Strasbourg, France
| | - M Rosenbusch
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
| | - L Schweikhard
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
| | - F Wienholtz
- CERN Geneva, 1211 Geneva, Switzerland
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
| | - R N Wolf
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - K Zuber
- Technische Universität Dresden, 01069 Dresden, Germany
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3
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Olivier L, Franchoo S, Niikura M, Vajta Z, Sohler D, Doornenbal P, Obertelli A, Tsunoda Y, Otsuka T, Authelet G, Baba H, Calvet D, Château F, Corsi A, Delbart A, Gheller JM, Gillibert A, Isobe T, Lapoux V, Matsushita M, Momiyama S, Motobayashi T, Otsu H, Péron C, Peyaud A, Pollacco EC, Roussé JY, Sakurai H, Santamaria C, Sasano M, Shiga Y, Takeuchi S, Taniuchi R, Uesaka T, Wang H, Yoneda K, Browne F, Chung LX, Dombradi Z, Flavigny F, Giacoppo F, Gottardo A, Hadyńska-Klęk K, Korkulu Z, Koyama S, Kubota Y, Lee J, Lettmann M, Louchart C, Lozeva R, Matsui K, Miyazaki T, Nishimura S, Ogata K, Ota S, Patel Z, Sahin E, Shand C, Söderström PA, Stefan I, Steppenbeck D, Sumikama T, Suzuki D, Werner V, Wu J, Xu Z. Persistence of the Z=28 Shell Gap Around ^{78}Ni: First Spectroscopy of ^{79}Cu. PHYSICAL REVIEW LETTERS 2017; 119:192501. [PMID: 29219515 DOI: 10.1103/physrevlett.119.192501] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Indexed: 06/07/2023]
Abstract
In-beam γ-ray spectroscopy of ^{79}Cu is performed at the Radioactive Isotope Beam Factory of RIKEN. The nucleus of interest is produced through proton knockout from a ^{80}Zn beam at 270 MeV/nucleon. The level scheme up to 4.6 MeV is established for the first time and the results are compared to Monte Carlo shell-model calculations. We do not observe significant knockout feeding to the excited states below 2.2 MeV, which indicates that the Z=28 gap at N=50 remains large. The results show that the ^{79}Cu nucleus can be described in terms of a valence proton outside a ^{78}Ni core, implying the magic character of the latter.
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Affiliation(s)
- L Olivier
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - S Franchoo
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - M Niikura
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Z Vajta
- MTA Atomki, P.O. Box 51, Debrecen H-4001, Hungary
| | - D Sohler
- MTA Atomki, P.O. Box 51, Debrecen H-4001, Hungary
| | - P Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Obertelli
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - Y Tsunoda
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Otsuka
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - G Authelet
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - H Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D Calvet
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - F Château
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - A Corsi
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - A Delbart
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - J-M Gheller
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - A Gillibert
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - T Isobe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - V Lapoux
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - M Matsushita
- Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan
| | - S Momiyama
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Motobayashi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Otsu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C Péron
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - A Peyaud
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - E C Pollacco
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - J-Y Roussé
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - H Sakurai
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C Santamaria
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - M Sasano
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Shiga
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 172-8501, Japan
| | - S Takeuchi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - R Taniuchi
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Uesaka
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Wang
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoneda
- 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
| | - L X Chung
- Institute for Nuclear Science & Technology, VINATOM, P.O. Box 5T-160, Nghia Do, Hanoi, Vietnam
| | - Z Dombradi
- MTA Atomki, P.O. Box 51, Debrecen H-4001, Hungary
| | - F Flavigny
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - F Giacoppo
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - A Gottardo
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - K Hadyńska-Klęk
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - Z Korkulu
- MTA Atomki, P.O. Box 51, Debrecen H-4001, Hungary
| | - S Koyama
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Y Kubota
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan
| | - J Lee
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
| | - M Lettmann
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - C Louchart
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - R Lozeva
- IPHC, CNRS/IN2P3, Université de Strasbourg, F-67037 Strasbourg, France
| | - K Matsui
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Miyazaki
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - S Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Ogata
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan
| | - S Ota
- Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan
| | - Z Patel
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - E Sahin
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - C Shand
- 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
| | - I Stefan
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - D Steppenbeck
- Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan
| | - T Sumikama
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - D Suzuki
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - V Werner
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - J Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People's Republic of China
| | - Z Xu
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
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4
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Sahin E, Bello Garrote FL, Tsunoda Y, Otsuka T, de Angelis G, Görgen A, Niikura M, Nishimura S, Xu ZY, Baba H, Browne F, Delattre MC, Doornenbal P, Franchoo S, Gey G, Hadyńska-Klȩk K, Isobe T, John PR, Jung HS, Kojouharov I, Kubo T, Kurz N, Li Z, Lorusso G, Matea I, Matsui K, Mengoni D, Morfouace P, Napoli DR, Naqvi F, Nishibata H, Odahara A, Sakurai H, Schaffner H, Söderström PA, Sohler D, Stefan IG, Sumikama T, Suzuki D, Taniuchi R, Taprogge J, Vajta Z, Watanabe H, Werner V, Wu J, Yagi A, Yalcinkaya M, Yoshinaga K. Shell Evolution towards ^{78}Ni: Low-Lying States in ^{77}Cu. PHYSICAL REVIEW LETTERS 2017; 118:242502. [PMID: 28665637 DOI: 10.1103/physrevlett.118.242502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Indexed: 06/07/2023]
Abstract
The level structure of the neutron-rich ^{77}Cu nucleus is investigated through β-delayed γ-ray spectroscopy at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. Ions of ^{77}Ni are produced by in-flight fission, separated and identified in the BigRIPS fragment separator, and implanted in the WAS3ABi silicon detector array, surrounded by Ge cluster detectors of the EURICA array. A large number of excited states in ^{77}Cu are identified for the first time by correlating γ rays with the β decay of ^{77}Ni, and a level scheme is constructed by utilizing their coincidence relationships. The good agreement between large-scale Monte Carlo shell model calculations and experimental results allows for the evaluation of the single-particle structure near ^{78}Ni and suggests a single-particle nature for both the 5/2_{1}^{-} and 3/2_{1}^{-} states in ^{77}Cu, leading to doubly magic ^{78}Ni.
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Affiliation(s)
- E Sahin
- Department of Physics, University of Oslo, Oslo 0316, Norway
| | | | - Y Tsunoda
- Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - T Otsuka
- Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium
| | - G de Angelis
- Laboratori Nazionali di Legnaro dell'INFN, Legnaro 35020, Italy
| | - A Görgen
- Department of Physics, University of Oslo, Oslo 0316, Norway
| | - M Niikura
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - S Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Z Y Xu
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Baba
- 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
| | - M-C Delattre
- Institut de Physique Nucleaire (IPN), IN2P3-CNRS, Université Paris-Sud 11, F-91406 Orsay Cedex, France
| | - P Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Franchoo
- Institut de Physique Nucleaire (IPN), IN2P3-CNRS, Université Paris-Sud 11, F-91406 Orsay Cedex, France
| | - 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
| | - K Hadyńska-Klȩk
- Department of Physics, University of Oslo, Oslo 0316, Norway
- Laboratori Nazionali di Legnaro dell'INFN, Legnaro 35020, Italy
| | - T Isobe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - P R John
- INFN Sezione di Padova and Dipartimento di Fisica e Astronomia, Università di Padova, Padova 35131, Italy
| | - H S Jung
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - I Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - T Kubo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Z Li
- Department of Physics, Peking University, Beijing 100871, China
| | - G Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - I Matea
- Institut de Physique Nucleaire (IPN), IN2P3-CNRS, Université Paris-Sud 11, F-91406 Orsay Cedex, France
| | - K Matsui
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - D Mengoni
- INFN Sezione di Padova and Dipartimento di Fisica e Astronomia, Università di Padova, Padova 35131, Italy
| | - P Morfouace
- Institut de Physique Nucleaire (IPN), IN2P3-CNRS, Université Paris-Sud 11, F-91406 Orsay Cedex, France
| | - D R Napoli
- Laboratori Nazionali di Legnaro dell'INFN, Legnaro 35020, Italy
| | - F Naqvi
- Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8120, USA
| | - H Nishibata
- Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - A Odahara
- Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - H Sakurai
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - P-A Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D Sohler
- Institute for Nuclear Research of the Hungarian Academy of Sciences, Debrecen H-4001, Hungary
| | - I G Stefan
- Institut de Physique Nucleaire (IPN), IN2P3-CNRS, Université Paris-Sud 11, F-91406 Orsay Cedex, France
| | - T Sumikama
- Department of Physics, Tohoku University, 6-3 Aramaki-Aoba, Aoba, Sendai 980-8578, Japan
| | - D Suzuki
- Institut de Physique Nucleaire (IPN), IN2P3-CNRS, Université Paris-Sud 11, F-91406 Orsay Cedex, France
| | - R Taniuchi
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - J Taprogge
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Departamento de Física Teórica, Universidad Autonoma de Madrid, E-28049 Madrid, Spain
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - Z Vajta
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Institute for Nuclear Research of the Hungarian Academy of Sciences, Debrecen H-4001, Hungary
| | - H Watanabe
- International Research Center for Nuclei and Particles in the Cosmos, Beihang University, Beijing 100191, China
| | - V Werner
- Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8120, USA
- Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany
| | - 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, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - M Yalcinkaya
- Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih 34134, Istanbul, Turkey
| | - K Yoshinaga
- Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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5
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Xu ZY, Nishimura S, Lorusso G, Browne F, Doornenbal P, Gey G, Jung HS, Li Z, Niikura M, Söderström PA, Sumikama T, Taprogge J, Vajta Z, Watanabe H, Wu J, Yagi A, Yoshinaga K, Baba H, Franchoo S, Isobe T, John PR, Kojouharov I, Kubono S, Kurz N, Matea I, Matsui K, Mengoni D, Morfouace P, Napoli DR, Naqvi F, Nishibata H, Odahara A, Sahin E, Sakurai H, Schaffner H, Stefan IG, Suzuki D, Taniuchi R, Werner V. β-Decay half-lives of 76,77Co, 79,80Ni, and 81Cu: experimental indication of a doubly magic 78Ni. PHYSICAL REVIEW LETTERS 2014; 113:032505. [PMID: 25083639 DOI: 10.1103/physrevlett.113.032505] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Indexed: 06/03/2023]
Abstract
The half-lives of 20 neutron-rich nuclei with Z=27-30 have been measured at the RIBF, including five new half-lives of (76)Co(21.7(-4.9)(+6.5) ms), (77)Co(13.0(-4.3)(+7.2) ms), (79)Ni(43.0(-7.5)(+8.6) ms), (80)Ni(23.9(-17.2)(+26.0) ms), and (81)Cu(73.2 ± 6.8 ms). In addition, the half-lives of (73-75)Co, (74-78)Ni, (78-80)Cu, and (80-82)Zn were determined with higher precision than previous works. Based on these new results, a systematic study of the β-decay half-lives has been carried out, which suggests a sizable magicity for both the proton number Z = 28 and the neutron number N=50 in (78)Ni.
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Affiliation(s)
- Z Y Xu
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan and RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - G Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - F Browne
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
| | - P Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - G Gey
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble Cedex, France and ILL, 38042 Grenoble Cedex, France
| | - H-S Jung
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Z Li
- Department of Physics, Peking University, Beijing 100871, China
| | - M Niikura
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
| | - P-A Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Sumikama
- Department of Physics, Tohoku University, 6-3 Aramaki-Aoba, Aoba, Sendai, Miyagi 980-8578, Japan
| | - J Taprogge
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain and Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - Zs Vajta
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and Institute for Nuclear Research, Hungarian Academy of Sciences, P.O. Box 51, Debrecen H-4001, Hungary
| | - H Watanabe
- IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
| | - J Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and Department of Physics, Peking University, Beijing 100871, China
| | - A Yagi
- Department of Physics, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan
| | - K Yoshinaga
- Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - H Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Franchoo
- Institut de Physique Nucléaire d'Orsay, IN2P3-CNRS, F-91406 Orsay, France
| | - T Isobe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - P R John
- Dipartimento di Fisica e Astronomia, Universitá di Padova and INFN Sezione di Padova, I-35131 Padova, Italy
| | - I Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - S Kubono
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - I Matea
- Institut de Physique Nucléaire d'Orsay, IN2P3-CNRS, F-91406 Orsay, France
| | - K Matsui
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
| | - D Mengoni
- Dipartimento di Fisica e Astronomia, Universitá di Padova and INFN Sezione di Padova, I-35131 Padova, Italy
| | - P Morfouace
- Institut de Physique Nucléaire d'Orsay, IN2P3-CNRS, F-91406 Orsay, France
| | - D R Napoli
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - F Naqvi
- Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511, USA
| | - H Nishibata
- Department of Physics, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan
| | - A Odahara
- Department of Physics, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan
| | - E Sahin
- Department of Physics, University of Oslo, Oslo NO-0316, Norway
| | - H Sakurai
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan and RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - I G Stefan
- Institut de Physique Nucléaire d'Orsay, IN2P3-CNRS, F-91406 Orsay, France
| | - D Suzuki
- Institut de Physique Nucléaire d'Orsay, IN2P3-CNRS, F-91406 Orsay, France
| | - R Taniuchi
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
| | - V Werner
- Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511, USA
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7
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Cheal B, Mané E, Billowes J, Bissell ML, Blaum K, Brown BA, Charlwood FC, Flanagan KT, Forest DH, Geppert C, Honma M, Jokinen A, Kowalska M, Krieger A, Krämer J, Moore ID, Neugart R, Neyens G, Nörtershäuser W, Schug M, Stroke HH, Vingerhoets P, Yordanov DT, Záková M. Nuclear spins and moments of Ga isotopes reveal sudden structural changes between N=40 and N=50. PHYSICAL REVIEW LETTERS 2010; 104:252502. [PMID: 20867369 DOI: 10.1103/physrevlett.104.252502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Indexed: 05/29/2023]
Abstract
Collinear laser spectroscopy was performed on Ga (Z=31) isotopes at ISOLDE, CERN. A gas-filled linear Paul trap (ISCOOL) was used to extend measurements towards very neutron-rich isotopes (N=36-50). A ground state (g.s.) spin I=1/2 is measured for 73Ga, being near degenerate with a 3/2{-} isomer (75 eV≲E{ex}≲1 keV). The 79Ga g.s., with I=3/2, is dominated by protons in the πf{5/2} orbital and in 81Ga the 5/2{-} level becomes the g.s. The data are compared to shell-model calculations in the f{5/2}pg{9/2} model space, calling for further theoretical developments and new experiments.
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Affiliation(s)
- B Cheal
- School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom.
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8
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Flanagan KT, Vingerhoets P, Avgoulea M, Billowes J, Bissell ML, Blaum K, Cheal B, De Rydt M, Fedosseev VN, Forest DH, Geppert C, Köster U, Kowalska M, Krämer J, Kratz KL, Krieger A, Mané E, Marsh BA, Materna T, Mathieu L, Molkanov PL, Neugart R, Neyens G, Nörtershäuser W, Seliverstov MD, Serot O, Schug M, Sjoedin MA, Stone JR, Stone NJ, Stroke HH, Tungate G, Yordanov DT, Volkov YM. Nuclear spins and magnetic moments of 71,73,75Cu: inversion of pi2p3/2 and pi1f5/2 levels in 75Cu. PHYSICAL REVIEW LETTERS 2009; 103:142501. [PMID: 19905565 DOI: 10.1103/physrevlett.103.142501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2009] [Indexed: 05/28/2023]
Abstract
We report the first confirmation of the predicted inversion between the pi2p3/2 and pi1f5/2 nuclear states in the nu(g)9/2 midshell. This was achieved at the ISOLDE facility, by using a combination of in-source laser spectroscopy and collinear laser spectroscopy on the ground states of 71,73,75Cu, which measured the nuclear spin and magnetic moments. The obtained values are mu(71Cu)=+2.2747(8)mu(N), mu(73Cu)=+1.7426(8)mu(N), and mu(75Cu)=+1.0062(13)mu(N) corresponding to spins I=3/2 for 71,73Cu and I=5/2 for 75Cu. The results are in fair agreement with large-scale shell-model calculations.
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Affiliation(s)
- K T Flanagan
- Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
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