Low-lying structure and shape evolution in neutron-rich Se isotopes

S. Chen; P. Doornenbal; A. Obertelli; T. R. Rodríguez; G. Authelet; H. Baba; D. Calvet; F. Château; A. Corsi; A. Delbart; J.-M. Gheller; A. Giganon; A. Gillibert; V. Lapoux; T. Motobayashi; M. Niikura; N. Paul; J.-Y. Roussé; H. Sakurai; C. Santamaria; D. Steppenbeck; R. Taniuchi; T. Uesaka; T. Ando; T. Arici; A. Blazhev; F. Browne; A. M. Bruce; R. Caroll; L. X. Chung; M. L. Cortés; M. Dewald; B. Ding; F. Flavigny; S. Franchoo; M. Górska; A. Gottardo; A. Jungclaus; J. Lee; M. Lettmann; B. D. Linh; J. Liu; Z. Liu; C. Lizarazo; S. Momiyama; K. Moschner; S. Nagamine; N. Nakatsuka; C. R. Nita; C. Nobs; L. Olivier; R. Orlandi; Z. Patel; Zs. Podolyak; M. Rudigier; T. Saito; C. Shand; P.-A. Söderström; I. Stefan; V. Vaquero; V. Werner; K. Wimmer; Z. Xu

doi:10.1103/PhysRevC.95.041302

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Low-lying structure and shape evolution in neutron-rich Se isotopes

S. Chen^1,2,*, P. Doornenbal², A. Obertelli^2,3, T. R. Rodríguez⁴, G. Authelet³, H. Baba², D. Calvet³, F. Château³, A. Corsi³ et al.

A. Delbart³, J.-M. Gheller³, A. Giganon³, A. Gillibert³, V. Lapoux³, T. Motobayashi², M. Niikura⁵, N. Paul³, J.-Y. Roussé³, H. Sakurai^2,5, C. Santamaria³, D. Steppenbeck², R. Taniuchi^2,5, T. Uesaka², T. Ando^2,5, T. Arici⁶, A. Blazhev⁷, F. Browne⁸, A. M. Bruce⁸, R. Caroll⁹, L. X. Chung¹⁰, M. L. Cortés^6,11, M. Dewald⁷, B. Ding¹², F. Flavigny¹³, S. Franchoo¹³, M. Górska⁶, A. Gottardo¹³, A. Jungclaus¹⁴, J. Lee¹⁵, M. Lettmann¹¹, B. D. Linh¹⁰, J. Liu¹⁵, Z. Liu¹², C. Lizarazo^6,11, S. Momiyama^2,5, K. Moschner⁷, S. Nagamine^2,5, N. Nakatsuka^2,16, C. R. Nita¹⁷, C. Nobs⁸, L. Olivier¹³, R. Orlandi¹⁸, Z. Patel⁹, Zs. Podolyak⁹, M. Rudigier⁹, T. Saito^2,5, C. Shand⁹, P.-A. Söderström², I. Stefan¹³, V. Vaquero¹⁴, V. Werner¹¹, K. Wimmer⁵, and Z. Xu¹⁵

¹School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
²RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
³IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
⁴Departamento de Física Teórica, Universidad Autónoma de Madrid, 28049, Madrid, Spain
⁵Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
⁶GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
⁷Institut für Kernphysik, Universität zu Köln, 50923 Köln, Germany
⁸School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
⁹Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
¹⁰Institute for Nuclear Science and Technique, VINATOM, 179 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam
¹¹Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
¹²Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
¹³Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
¹⁴Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
¹⁵Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
¹⁶Department of Physics, Faculty of Science, Kyoto University, Kyoto 606-8502, Japan
¹⁷Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), R-077125 Bucharest, Romania
¹⁸Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan

^*sidong.chen@riken.jp

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Phys. Rev. C 95, 041302(R) – Published 27 April, 2017

DOI: https://doi.org/10.1103/PhysRevC.95.041302

Abstract

Neutron-rich ${}^{88, 90, 92, 94}{Se}$ isotopes were studied via in-beam $γ$ -ray spectroscopy after nucleon removal reactions at intermediate energies at the Radioactive Isotope Beam Factory. Based on $γ - γ$ coincidence analysis, low-lying excitation level schemes are proposed for these nuclei, including the $2_{1}^{+}, 4_{1}^{+}$ states and $2_{2}^{+}$ states at remarkably low energies. The low-lying $2_{2}^{+}$ states, along with other features, indicate triaxiality in these nuclei. The experimental results are in good overall agreement with self-consistent beyond-mean-field calculations based on the Gogny D1S interaction, which suggests both triaxial degree of freedom and shape coexistence playing important roles in the description of intrinsic deformations in neutron-rich Se isotopes.

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Low-lying structure and shape evolution in neutron-rich Se isotopes

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Low-lying structure and shape evolution in neutron-rich Se isotopes

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