1
|
Mărginean N, Little D, Tsunoda Y, Leoni S, Janssens RVF, Fornal B, Otsuka T, Michelagnoli C, Stan L, Crespi FCL, Costache C, Lica R, Sferrazza M, Turturica A, Ayangeakaa AD, Auranen K, Barani M, Bender PC, Bottoni S, Boromiza M, Bracco A, Călinescu S, Campbell CM, Carpenter MP, Chowdhury P, Ciemała M, Cieplicka-Oryǹczak N, Cline D, Clisu C, Crawford HL, Dinescu IE, Dudouet J, Filipescu D, Florea N, Forney AM, Fracassetti S, Gade A, Gheorghe I, Hayes AB, Harca I, Henderson J, Ionescu A, Iskra ŁW, Jentschel M, Kandzia F, Kim YH, Kondev FG, Korschinek G, Köster U, Krzysiek M, Lauritsen T, Li J, Mărginean R, Maugeri EA, Mihai C, Mihai RE, Mitu A, Mutti P, Negret A, Niţă CR, Olăcel A, Oprea A, Pascu S, Petrone C, Porzio C, Rhodes D, Seweryniak D, Schumann D, Sotty C, Stolze SM, Şuvăilă R, Toma S, Ujeniuc S, Walters WB, Wu CY, Wu J, Zhu S, Ziliani S. Shape Coexistence at Zero Spin in ^{64}Ni Driven by the Monopole Tensor Interaction. Phys Rev Lett 2020; 125:102502. [PMID: 32955302 DOI: 10.1103/physrevlett.125.102502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 07/31/2020] [Indexed: 06/11/2023]
Abstract
The low-spin structure of the semimagic ^{64}Ni nucleus has been considerably expanded: combining four experiments, several 0^{+} and 2^{+} excited states were identified below 4.5 MeV, and their properties established. The Monte Carlo shell model accounts for the results and unveils an unexpectedly complex landscape of coexisting shapes: a prolate 0^{+} excitation is located at a surprisingly high energy (3463 keV), with a collective 2^{+} state 286 keV above it, the first such observation in Ni isotopes. The evolution in excitation energy of the prolate minimum across the neutron N=40 subshell gap highlights the impact of the monopole interaction and its variation in strength with N.
Collapse
Affiliation(s)
- N Mărginean
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - D Little
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255, USA
- Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708-2308, USA
| | - Y Tsunoda
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - S Leoni
- Dipartimento di Fisica, Universitá degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133 Milano, Italy
| | - R V F Janssens
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255, USA
- Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708-2308, USA
| | - B Fornal
- Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland
| | - T Otsuka
- Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- KU Leuven, Instituut voor Kern- en Stralingsfysica, 3000 Leuven, Belgium
| | - C Michelagnoli
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38042 Grenoble, France
| | - L Stan
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - F C L Crespi
- Dipartimento di Fisica, Universitá degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133 Milano, Italy
| | - C Costache
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - R Lica
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - M Sferrazza
- Département de Physique, Université libre de Bruxelles, B-1050 Bruxelles, Belgium
| | - A Turturica
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A D Ayangeakaa
- Department of Physics, United States Naval Academy, Annapolis, Maryland 21402, USA
| | - K Auranen
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Barani
- Dipartimento di Fisica, Universitá degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133 Milano, Italy
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38042 Grenoble, France
| | - P C Bender
- Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA
| | - S Bottoni
- Dipartimento di Fisica, Universitá degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133 Milano, Italy
| | - M Boromiza
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A Bracco
- Dipartimento di Fisica, Universitá degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133 Milano, Italy
| | - S Călinescu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - C M Campbell
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - M P Carpenter
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - P Chowdhury
- Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA
| | - M Ciemała
- Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland
| | | | - D Cline
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
| | - C Clisu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - H L Crawford
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - I E Dinescu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - J Dudouet
- Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
| | - D Filipescu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - N Florea
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A M Forney
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - S Fracassetti
- Dipartimento di Fisica, Universitá degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133 Milano, Italy
| | - A Gade
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - I Gheorghe
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A B Hayes
- National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - I Harca
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - J Henderson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Ionescu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - Ł W Iskra
- INFN sezione di Milano via Celoria 16, 20133 Milano, Italy
| | - M Jentschel
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38042 Grenoble, France
| | - F Kandzia
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38042 Grenoble, France
| | - Y H Kim
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38042 Grenoble, France
| | - F G Kondev
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - G Korschinek
- Technische Universität München, 80333 München, Germany
| | - U Köster
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38042 Grenoble, France
| | - M Krzysiek
- Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland
| | - T Lauritsen
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J Li
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R Mărginean
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - E A Maugeri
- Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - C Mihai
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - R E Mihai
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A Mitu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - P Mutti
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38042 Grenoble, France
| | - A Negret
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - C R Niţă
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A Olăcel
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A Oprea
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - S Pascu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - C Petrone
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - C Porzio
- Dipartimento di Fisica, Universitá degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133 Milano, Italy
| | - D Rhodes
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Seweryniak
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - D Schumann
- Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - C Sotty
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - S M Stolze
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R Şuvăilă
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - S Toma
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - S Ujeniuc
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - W B Walters
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - C Y Wu
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Wu
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S Zhu
- National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - S Ziliani
- Dipartimento di Fisica, Universitá degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133 Milano, Italy
| |
Collapse
|
2
|
Lizarazo C, Söderström PA, Werner V, Pietralla N, Walker PM, Dong GX, Xu FR, Rodríguez TR, Browne F, Doornenbal P, Nishimura S, Niţă CR, Obertelli A, Ando T, Arici T, Authelet G, Baba H, Blazhev A, Bruce AM, Calvet D, Caroll RJ, Château F, Chen S, Chung LX, Corsi A, Cortés ML, Delbart A, Dewald M, Ding B, Flavigny F, Franchoo S, Gerl J, Gheller JM, Giganon A, Gillibert A, Górska M, Gottardo A, Kojouharov I, Kurz N, Lapoux V, Lee J, Lettmann M, Linh BD, Liu JJ, Liu Z, Momiyama S, Moschner K, Motobayashi T, Nagamine S, Nakatsuka N, Niikura M, Nobs C, Olivier L, Patel Z, Paul N, Podolyák Z, Roussé JY, Rudigier M, Saito TY, Sakurai H, Santamaria C, Schaffner H, Shand C, Stefan I, Steppenbeck D, Taniuchi R, Uesaka T, Vaquero V, Wimmer K, Xu Z. Metastable States of ^{92,94}Se: Identification of an Oblate K Isomer of ^{94}Se and the Ground-State Shape Transition between N=58 and 60. Phys Rev Lett 2020; 124:222501. [PMID: 32567911 DOI: 10.1103/physrevlett.124.222501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 04/17/2020] [Accepted: 05/12/2020] [Indexed: 06/11/2023]
Abstract
Here we present new information on the shape evolution of the very neutron-rich ^{92,94}Se nuclei from an isomer-decay spectroscopy experiment at the Radioactive Isotope Beam Factory at RIKEN. High-resolution germanium detectors were used to identify delayed γ rays emitted following the decay of their isomers. New transitions are reported extending the previously known level schemes. The isomeric levels are interpreted as originating from high-K quasineutron states with an oblate deformation of β∼0.25, with the high-K state in ^{94}Se being metastable and K hindered. Following this, ^{94}Se is the lowest-mass neutron-rich nucleus known to date with such a substantial K hindrance. Furthermore, it is the first observation of an oblate K isomer in a deformed nucleus. This opens up the possibility for a new region of K isomers at low Z and at oblate deformation, involving the same neutron orbitals as the prolate orbitals within the classic Z∼72 deformed hafnium region. From an interpretation of the level scheme guided by theoretical calculations, an oblate deformation is also suggested for the ^{94}Se_{60} ground-state band.
Collapse
Affiliation(s)
- C Lizarazo
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - P-A Söderström
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Extreme Light Infrastructure-Nuclear Physics (ELI-NP)/Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), Strada Reactorului 30, 077125 Bucharest-Măgurele, Romania
| | - V Werner
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - N Pietralla
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - P M Walker
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - G X Dong
- School of Science, Huzhou University, Huzhou 313000, China
| | - F R Xu
- State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People's Republic of China
| | - T R Rodríguez
- Departamento de Física Teórica, Universidad Autónoma de Madrid, 28049, Spain
| | - F Browne
- 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
| | - S Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C R Niţă
- Department of Nuclear Physics (DFN)/Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), Strada Reactorului 30, 077125 Bucharest-Măgurele, Romania
| | - A Obertelli
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - T Ando
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Arici
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - 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
| | - A Blazhev
- Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
| | - A M Bruce
- School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
| | - D Calvet
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - R J Caroll
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - F Château
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - S Chen
- 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
| | - L X Chung
- Institute for Nuclear Science and Technology, VINATOM, P.O. Box 5T-160, Nghia Do, Hanoi, Vietnam
| | - A Corsi
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - M L Cortés
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Delbart
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - M Dewald
- Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
| | - B Ding
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - F Flavigny
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | - S Franchoo
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | - J Gerl
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - J-M Gheller
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - A Giganon
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - A Gillibert
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - M Górska
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - A Gottardo
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | - I Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - V Lapoux
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - J Lee
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
| | - M Lettmann
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - B D Linh
- Institute for Nuclear Science and Technology, VINATOM, P.O. Box 5T-160, Nghia Do, Hanoi, Vietnam
| | - J J Liu
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
| | - Z Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - S Momiyama
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - K Moschner
- Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
| | - T Motobayashi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Nagamine
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - N Nakatsuka
- Department of Physics, Faculty of Science, Kyoto University, Kyoto 606-8502, Japan
| | - M Niikura
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - C Nobs
- School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
| | - L Olivier
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | - Z Patel
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - N Paul
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - Zs Podolyák
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - J-Y Roussé
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - M Rudigier
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - T Y Saito
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Sakurai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - C Santamaria
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - H Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - C Shand
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - I Stefan
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | - D Steppenbeck
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - R Taniuchi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Uesaka
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - V Vaquero
- Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
| | - K Wimmer
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Z Xu
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
| |
Collapse
|
3
|
Leoni S, Fornal B, Mărginean N, Sferrazza M, Tsunoda Y, Otsuka T, Bocchi G, Crespi FCL, Bracco A, Aydin S, Boromiza M, Bucurescu D, Cieplicka-Oryǹczak N, Costache C, Călinescu S, Florea N, Ghiţă DG, Glodariu T, Ionescu A, Iskra ŁW, Krzysiek M, Mărginean R, Mihai C, Mihai RE, Mitu A, Negreţ A, Niţă CR, Olăcel A, Oprea A, Pascu S, Petkov P, Petrone C, Porzio G, Şerban A, Sotty C, Stan L, Ştiru I, Stroe L, Şuvăilă R, Toma S, Turturică A, Ujeniuc S, Ur CA. Multifaceted Quadruplet of Low-Lying Spin-Zero States in ^{66}Ni: Emergence of Shape Isomerism in Light Nuclei. Phys Rev Lett 2017; 118:162502. [PMID: 28474931 DOI: 10.1103/physrevlett.118.162502] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Indexed: 06/07/2023]
Abstract
A search for shape isomers in the ^{66}Ni nucleus was performed, following old suggestions of various mean-field models and recent ones, based on state-of-the-art Monte Carlo shell model (MCSM), all considering ^{66}Ni as the lightest nuclear system with shape isomerism. By employing the two-neutron transfer reaction induced by an ^{18}O beam on a ^{64}Ni target, at the sub-Coulomb barrier energy of 39 MeV, all three lowest-excited 0^{+} states in ^{66}Ni were populated and their γ decay was observed by γ-coincidence technique. The 0^{+} states lifetimes were assessed with the plunger method, yielding for the 0_{2}^{+}, 0_{3}^{+}, and 0_{4}^{+} decay to the 2_{1}^{+} state the B(E2) values of 4.3, 0.1, and 0.2 Weisskopf units (W.u.), respectively. MCSM calculations correctly predict the existence of all three excited 0^{+} states, pointing to the oblate, spherical, and prolate nature of the consecutive excitations. In addition, they account for the hindrance of the E2 decay from the prolate 0_{4}^{+} to the spherical 2_{1}^{+} state, although overestimating its value. This result makes ^{66}Ni a unique nuclear system, apart from ^{236,238}U, in which a retarded γ transition from a 0^{+} deformed state to a spherical configuration is observed, resembling a shape-isomerlike behavior.
Collapse
Affiliation(s)
- S Leoni
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133, Milano, Italy
| | - B Fornal
- Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland
| | - N Mărginean
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - M Sferrazza
- Département de Physique, Université libre de Bruxelles, B-1050 Bruxelles, Belgium
| | - 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, Hongo, Bunkyo-ku, 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 Bocchi
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133, Milano, Italy
| | - F C L Crespi
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133, Milano, Italy
| | - A Bracco
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133, Milano, Italy
| | - S Aydin
- Department of Physics, University of Aksaray, Adana E-90 Karayolu Üzeri, Aksaray, Turkey
| | - M Boromiza
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
- University of Bucharest, Faculty of Physics, Bucharest-Magurele, 077125, Romania
| | - D Bucurescu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - N Cieplicka-Oryǹczak
- INFN sezione di Milano via Celoria 16, 20133, Milano, Italy
- Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland
| | - C Costache
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - S Călinescu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - N Florea
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - D G Ghiţă
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - T Glodariu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A Ionescu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
- University of Bucharest, Faculty of Physics, Bucharest-Magurele, 077125, Romania
| | - Ł W Iskra
- Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland
| | - M Krzysiek
- Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland
| | - R Mărginean
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - C Mihai
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - R E Mihai
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A Mitu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A Negreţ
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - C R Niţă
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A Olăcel
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A Oprea
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - S Pascu
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - P Petkov
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - C Petrone
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - G Porzio
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- INFN sezione di Milano via Celoria 16, 20133, Milano, Italy
| | - A Şerban
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
- University of Bucharest, Faculty of Physics, Bucharest-Magurele, 077125, Romania
| | - C Sotty
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - L Stan
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - I Ştiru
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - L Stroe
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - R Şuvăilă
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - S Toma
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - A Turturică
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - S Ujeniuc
- Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest 077125, Romania
| | - C A Ur
- Extreme Light Infrastructure-Nuclear Physics, IFIN-HH, Bucharest, 077125, Romania
| |
Collapse
|