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Flavigny F, Doornenbal P, Obertelli A, Delaroche JP, Girod M, Libert J, Rodriguez TR, Authelet G, Baba H, Calvet D, Château F, Chen S, Corsi A, Delbart A, Gheller JM, Giganon A, Gillibert A, Lapoux V, Motobayashi T, Niikura M, Paul N, Roussé JY, Sakurai H, Santamaria C, Steppenbeck D, Taniuchi R, Uesaka T, Ando T, Arici T, Blazhev A, Browne F, Bruce A, Carroll R, Chung LX, Cortés ML, Dewald M, Ding B, Franchoo S, Górska M, Gottardo A, Jungclaus A, Lee J, Lettmann M, Linh BD, Liu J, Liu Z, Lizarazo C, Momiyama S, Moschner K, Nagamine S, Nakatsuka N, Nita C, Nobs CR, Olivier L, Orlandi R, Patel Z, Podolyák Z, Rudigier M, Saito T, Shand C, Söderström PA, Stefan I, Vaquero V, Werner V, Wimmer K, Xu Z. Shape Evolution in Neutron-Rich Krypton Isotopes Beyond N=60: First Spectroscopy of ^{98,100}Kr. PHYSICAL REVIEW LETTERS 2017; 118:242501. [PMID: 28665635 DOI: 10.1103/physrevlett.118.242501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Indexed: 06/07/2023]
Abstract
We report on the first γ-ray spectroscopy of low-lying states in neutron-rich ^{98,100}Kr isotopes obtained from ^{99,101}Rb(p,2p) reactions at ∼220 MeV/nucleon. A reduction of the 2_{1}^{+} state energies beyond N=60 demonstrates a significant increase of deformation, shifted in neutron number compared to the sharper transition observed in strontium and zirconium isotopes. State-of-the-art beyond-mean-field calculations using the Gogny D1S interaction predict level energies in good agreement with experimental results. The identification of a low-lying (0_{2}^{+}, 2_{2}^{+}) state in ^{98}Kr provides the first experimental evidence of a competing configuration at low energy in neutron-rich krypton isotopes consistent with the oblate-prolate shape coexistence picture suggested by theory.
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Affiliation(s)
- F Flavigny
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - 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
| | | | - M Girod
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - J Libert
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - T R Rodriguez
- Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - 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
| | - S Chen
- 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, People's Republic of China
| | - 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 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
| | - V Lapoux
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - T Motobayashi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Niikura
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - N Paul
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- 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
- 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
| | - 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
| | - 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
| | - A Blazhev
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - F Browne
- School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
| | - A Bruce
- School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
| | - R Carroll
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - L X Chung
- Institute for Nuclear Science and Technique, VINATOM, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
| | - M L Cortés
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - M Dewald
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - B Ding
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - S Franchoo
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - M Górska
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - A Gottardo
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - A Jungclaus
- Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
| | - J Lee
- Department of Physics, 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 Technique, VINATOM, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
| | - J Liu
- Department of Physics, University of Hong Kong, Pokfulam, Hong Kong
| | - Z Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - C Lizarazo
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - 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, 50937 Köln, Germany
| | - 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
| | - C Nita
- Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), RO-077125 Bucharest, Romania
| | - C R Nobs
- School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
| | - L Olivier
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - R Orlandi
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
| | - 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
| | - M Rudigier
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - T Saito
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - 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, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - V Vaquero
- Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
| | - V Werner
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - K Wimmer
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Z Xu
- Department of Physics, University of Hong Kong, Pokfulam, Hong Kong
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Dudouet J, Lemasson A, Duchêne G, Rejmund M, Clément E, Michelagnoli C, Didierjean F, Korichi A, Maquart G, Stezowski O, Lizarazo C, Pérez-Vidal RM, Andreoiu C, de Angelis G, Astier A, Delafosse C, Deloncle I, Dombradi Z, de France G, Gadea A, Gottardo A, Jacquot B, Jones P, Konstantinopoulos T, Kuti I, Le Blanc F, Lenzi SM, Li G, Lozeva R, Million B, Napoli DR, Navin A, Petrache CM, Pietralla N, Ralet D, Ramdhane M, Redon N, Schmitt C, Sohler D, Verney D, Barrientos D, Birkenbach B, Burrows I, Charles L, Collado J, Cullen DM, Désesquelles P, Domingo Pardo C, González V, Harkness-Brennan L, Hess H, Judson DS, Karolak M, Korten W, Labiche M, Ljungvall J, Menegazzo R, Mengoni D, Pullia A, Recchia F, Reiter P, Salsac MD, Sanchis E, Theisen C, Valiente-Dobón JJ, Zielińska M. _{36}^{96}Kr_{60}-Low-Z Boundary of the Island of Deformation at N=60. PHYSICAL REVIEW LETTERS 2017; 118:162501. [PMID: 28474951 DOI: 10.1103/physrevlett.118.162501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Indexed: 06/07/2023]
Abstract
Prompt γ-ray spectroscopy of the neutron-rich ^{96}Kr, produced in transfer- and fusion-induced fission reactions, has been performed using the combination of the Advanced Gamma Tracking Array and the VAMOS++ spectrometer. A second excited state, assigned to J^{π}=4^{+}, is observed for the first time, and a previously reported level energy of the first 2^{+} excited state is confirmed. The measured energy ratio R_{4/2}=E(4^{+})/E(2^{+})=2.12(1) indicates that this nucleus does not show a well-developed collectivity contrary to that seen in heavier N=60 isotones. This new measurement highlights an abrupt transition of the degree of collectivity as a function of the proton number at Z=36, of similar amplitude to that observed at N=60 at higher Z values. A possible reason for this abrupt transition could be related to the insufficient proton excitations in the g_{9/2}, d_{5/2}, and s_{1/2} orbitals to generate strong quadrupole correlations or to the coexistence of competing different shapes. An unexpected continuous decrease of R_{4/2} as a function of the neutron number up to N=60 is also evidenced. This measurement establishes the Kr isotopic chain as the low-Z boundary of the island of deformation for N=60 isotones. A comparison with available theoretical predictions using different beyond mean-field approaches shows that these models fail to reproduce the abrupt transitions at N=60 and Z=36.
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Affiliation(s)
- J Dudouet
- Université, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622 Villeurbanne, France
| | - A Lemasson
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - G Duchêne
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - M Rejmund
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - E Clément
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - C Michelagnoli
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - F Didierjean
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - A Korichi
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - G Maquart
- Université, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622 Villeurbanne, France
| | - O Stezowski
- Université, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622 Villeurbanne, France
| | - C Lizarazo
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
- GSI, Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - R M Pérez-Vidal
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46980 Valencia, Spain
| | - C Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - G de Angelis
- INFN, Laboratori Nazionali di Legnaro, Via Romea 4, I-35020 Legnaro, Italy
| | - A Astier
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - C Delafosse
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris Sud, Université Paris Saclay, 91406 Orsay Cedex, France
| | - I Deloncle
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - Z Dombradi
- Institute for Nuclear Research of the Hungarian Academy of Sciences, Pf. 51, H-4001 Debrecen, Hungary
| | - G de France
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - A Gadea
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46980 Valencia, Spain
| | - A Gottardo
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris Sud, Université Paris Saclay, 91406 Orsay Cedex, France
| | - B Jacquot
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - P Jones
- iThemba LABS, National Research Foundation, P.O. Box 722, Somerset West, 7129 South Africa
| | - T Konstantinopoulos
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - I Kuti
- Institute for Nuclear Research of the Hungarian Academy of Sciences, Pf. 51, H-4001 Debrecen, Hungary
| | - F Le Blanc
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - S M Lenzi
- INFN Sezione di Padova, I-35131 Padova, Italy
- Dipartimento di Fisica e Astronomia dell'Università di Padova, I-35131 Padova, Italy
| | - G Li
- GSI, Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - R Lozeva
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - B Million
- INFN, Sezione di Milano, Milano 20133, Italy
| | - D R Napoli
- INFN, Laboratori Nazionali di Legnaro, Via Romea 4, I-35020 Legnaro, Italy
| | - A Navin
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - C M Petrache
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - N Pietralla
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - D Ralet
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - M Ramdhane
- LPSC, Université Grenoble-Alpes, CNRS/IN2P3, 38026 Grenoble Cedex, France
| | - N Redon
- Université, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622 Villeurbanne, France
| | - C Schmitt
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - D Sohler
- Institute for Nuclear Research of the Hungarian Academy of Sciences, Pf. 51, H-4001 Debrecen, Hungary
| | - D Verney
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris Sud, Université Paris Saclay, 91406 Orsay Cedex, France
| | | | - B Birkenbach
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - I Burrows
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - L Charles
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - J Collado
- Departamento de Ingeniería Electrónica, Universitat de Valencia, 46100 Burjassot, Valencia, Spain
| | - D M Cullen
- Nuclear Physics Group, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
| | - P Désesquelles
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - C Domingo Pardo
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46980 Valencia, Spain
| | - V González
- Departamento de Ingeniería Electrónica, Universitat de Valencia, 46100 Burjassot, Valencia, Spain
| | - L Harkness-Brennan
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - H Hess
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - D S Judson
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - M Karolak
- IRFU, CEA/DRF, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - W Korten
- IRFU, CEA/DRF, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - M Labiche
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - J Ljungvall
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - R Menegazzo
- INFN Sezione di Padova, I-35131 Padova, Italy
| | - D Mengoni
- INFN Sezione di Padova, I-35131 Padova, Italy
- Dipartimento di Fisica e Astronomia dell'Università di Padova, I-35131 Padova, Italy
| | - A Pullia
- INFN, Sezione di Milano, Milano 20133, Italy
- Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy
| | - F Recchia
- INFN Sezione di Padova, I-35131 Padova, Italy
- Dipartimento di Fisica e Astronomia dell'Università di Padova, I-35131 Padova, Italy
| | - P Reiter
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - M D Salsac
- IRFU, CEA/DRF, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - E Sanchis
- Departamento de Ingeniería Electrónica, Universitat de Valencia, 46100 Burjassot, Valencia, Spain
| | - Ch Theisen
- IRFU, CEA/DRF, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - J J Valiente-Dobón
- INFN, Laboratori Nazionali di Legnaro, Via Romea 4, I-35020 Legnaro, Italy
| | - M Zielińska
- IRFU, CEA/DRF, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
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